Publish

- @now/python@0.2.6

.circleci/build.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+set -euo pipefail
+
+circleci_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+needs_build="$(grep -rn '"build"' packages/*/package.json | cut -d: -f1)"
+
+for pkg in $needs_build; do
+  dir="$(dirname "$pkg")"
+  cd "$circleci_dir/../$dir"
+  echo "Building \`$dir\`"
+  yarn build
+done

.circleci/config.yml

@@ -4,6 +4,8 @@ jobs:
     docker:
       - image: circleci/node:10
     working_directory: ~/repo
+    environment:
+      GOPATH: $HOME/go
     steps:
       - checkout
       - run:
@@ -18,57 +20,17 @@ jobs:
       - run:
           name: Bootstrapping
           command: yarn bootstrap
+      - run:
+          name: Building
+          command: ./.circleci/build.sh
       - run:
           name: Linting
           command: yarn lint
       - run:
-          name: Tests
-          command: yarn test
-  # publish-canary:
-  #   docker:
-  #     - image: circleci/node:10
-  #   working_directory: ~/repo
-  #   steps:
-  #     - checkout
-  #     - run: yarn install
-  #     - run: yarn bootstrap
-  #     - run:
-  #         name: Saving Authentication Information
-  #         command: echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" >> ~/.npmrc
-  #     - run:
-  #         name: Publishing to Canary Channel
-  #         command: yarn run lerna publish from-git --npm-tag canary --yes
-  publish-stable:
-    docker:
-      - image: circleci/node:10
-    working_directory: ~/repo
-    steps:
-      - checkout
-      - run: yarn install
-      - run: yarn bootstrap
-      - run:
-          name: Saving Authentication Information
-          command: echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" >> ~/.npmrc
-      - run:
-          name: Publishing to Stable Channel
-          command: yarn run lerna publish from-git --yes
+          name: Tests and Coverage
+          command: yarn test-coverage
 workflows:
   version: 2
-  unscheduled:
+  build-and-test:
     jobs:
-      - build:
-          filters:
-            tags:
-              only: /.*/
-      - publish-stable:
-          requires:
-            - build
-          filters:
-            tags:
-              only: /^.*(\d+\.)(\d+\.)(\*|\d+)$/
-      # - publish-canary:
-      #     requires:
-      #       - build
-      #     filters:
-      #       tags:
-      #         only: /^.*canary.*($|\b)/
+      - build

.circleci/publish.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+set -euo pipefail
+
+if [ -z "$NPM_TOKEN" ]; then
+  echo "NPM_TOKEN not found. Did you forget to assign the GitHub Action secret?"
+  exit 1
+fi
+
+echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" >> ~/.npmrc
+
+if [ ! -e ~/.npmrc ]; then
+  echo "~/.npmrc file does not exist, skipping publish"
+  exit 0
+fi
+
+npm_tag=""
+tag="$(git describe --tags --exact-match 2> /dev/null || :)"
+
+if [ -z "$tag" ]; then
+  echo "Not a tagged commit, skipping publish"
+  exit 0
+fi
+
+if [[ "$tag" =~ -canary ]]; then
+  echo "Publishing canary release"
+  npm_tag="--npm-tag canary"
+else
+  echo "Publishing stable release"
+fi
+
+yarn run lerna publish from-git $npm_tag --yes

.editorconfig

@@ -0,0 +1,43 @@
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{*.json,*.json.example,*.gyp,*.yml,*.yaml,*.workflow}]
+indent_style = space
+indent_size = 2
+
+[{*.py,*.asm}]
+indent_style = space
+
+[*.py]
+indent_size = 4
+
+[*.asm]
+indent_size = 8
+
+[*.md]
+trim_trailing_whitespace = false
+indent_style = space
+indent_size = 2
+
+# Ideal settings - some plugins might support these
+[*.js,*.jsx,*.ts,*.tsx]
+quote_type = single
+indent_style = space
+indent_size = 2
+
+[{*.c,*.cc,*.h,*.hh,*.cpp,*.hpp,*.m,*.mm,*.mpp,*.java,*.go,*.rs,*.php,*.ng,*.d,*.cs,*.swift}]
+indent_style = tab
+indent_size = 4
+tab_width = 4
+
+[{*.c,*.cc,*.h,*.hh,*.cpp,*.hpp,*.m,*.mm,*.mpp,*.js,*.java,*.go,*.rs,*.php,*.ng,*.jsx,*.ts,*.tsx,*.d,*.cs,*.swift}]
+curly_bracket_next_line = false
+spaces_around_operators = true
+spaces_around_brackets = outside
+# close enough to 1TB
+indent_brace_style = K&R

.eslintignore

@@ -1,3 +1,17 @@
 /tmp/*
 /node_modules/*
 /**/node_modules/*
+/packages/now-go/go/*
+/packages/now-build-utils/dist/*
+/packages/now-build-utils/src/*.js
+/packages/now-build-utils/src/fs/*.js
+/packages/now-node/dist/*
+/packages/now-layer-node/dist/*
+/packages/now-layer-npm/dist/*
+/packages/now-layer-yarn/dist/*
+/packages/now-next/dist/*
+/packages/now-node-bridge/*
+/packages/now-python/dist/*
+/packages/now-optipng/dist/*
+/packages/now-go/*
+/packages/now-rust/dist/*

.eslintrc

@@ -1,10 +1,24 @@
 {
-  "extends": ["airbnb-base", "prettier"],
+  "extends": ["prettier", "airbnb-base"],
   "rules": {
     "no-console": 0,
     "import/no-unresolved": 0,
     "import/no-dynamic-require": 0,
     "global-require": 0
-  }
+  },
+  "overrides": [
+    {
+      "files": ["**/test/**"],
+      "rules": {
+        "import/no-extraneous-dependencies": 0
+      },
+      "globals": {
+        "describe": true,
+        "it": true,
+        "test": true,
+        "expect": true
+      }
+    }
+  ]
 }
 

.github/CODEOWNERS

@@ -0,0 +1,9 @@
+# Documentation
+# https://help.github.com/en/articles/about-code-owners
+
+*                       @styfle
+/packages/now-node      @styfle @tootallnate
+/packages/now-next      @timer  @dav-is
+/packages/now-go        @styfle @sophearak
+/packages/now-python    @styfle @sophearak
+/packages/now-rust      @styfle @mike-engel @anmonteiro

.github/main.workflow

@@ -0,0 +1,76 @@
+workflow "Canary publish" {
+  on = "push"
+  resolves = ["3. Canary yarn run publish"]
+}
+
+action "0. Canary filter" {
+  uses = "actions/bin/filter@3c0b4f0e63ea54ea5df2914b4fabf383368cd0da"
+  args = "branch canary"
+}
+
+action "0. Canary PR not deleted" {
+  uses = "actions/bin/filter@3c0b4f0e63ea54ea5df2914b4fabf383368cd0da"
+  needs = ["0. Canary filter"]
+  args = "not deleted"
+}
+
+action "1. Canary yarn install" {
+  uses = "actions/npm@59b64a598378f31e49cb76f27d6f3312b582f680"
+  needs = ["0. Canary PR not deleted"]
+  runs = "yarn"
+  args = "install"
+}
+
+action "2. Canary yarn run build" {
+  uses = "actions/npm@59b64a598378f31e49cb76f27d6f3312b582f680"
+  needs = ["1. Canary yarn install"]
+  runs = "yarn"
+  args = "run build"
+}
+
+action "3. Canary yarn run publish" {
+  uses = "actions/npm@59b64a598378f31e49cb76f27d6f3312b582f680"
+  needs = ["2. Canary yarn run build"]
+  runs = "yarn"
+  args = "run publish-from-github"
+  secrets = ["NPM_TOKEN"]
+}
+
+
+workflow "Master publish" {
+  on = "push"
+  resolves = ["3. Master yarn run publish"]
+}
+
+action "0. Master filter" {
+  uses = "actions/bin/filter@3c0b4f0e63ea54ea5df2914b4fabf383368cd0da"
+  args = "branch master"
+}
+
+action "0. Master PR not deleted" {
+  uses = "actions/bin/filter@3c0b4f0e63ea54ea5df2914b4fabf383368cd0da"
+  needs = ["0. Master filter"]
+  args = "not deleted"
+}
+
+action "1. Master yarn install" {
+  uses = "actions/npm@59b64a598378f31e49cb76f27d6f3312b582f680"
+  needs = ["0. Master PR not deleted"]
+  runs = "yarn"
+  args = "install"
+}
+
+action "2. Master yarn run build" {
+  uses = "actions/npm@59b64a598378f31e49cb76f27d6f3312b582f680"
+  needs = ["1. Master yarn install"]
+  runs = "yarn"
+  args = "run build"
+}
+
+action "3. Master yarn run publish" {
+  uses = "actions/npm@59b64a598378f31e49cb76f27d6f3312b582f680"
+  needs = ["2. Master yarn run build"]
+  runs = "yarn"
+  args = "run publish-from-github"
+  secrets = ["NPM_TOKEN"]
+}

.gitignore

@@ -1,2 +1,6 @@
 node_modules
 tmp
+target/
+.next
+coverage
+*.tgz

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+  "eslint.enable": false
+}

.yarnrc

@@ -0,0 +1 @@
+save-prefix ""

CODE_OF_CONDUCT.md

@@ -0,0 +1,74 @@
+## Code of Conduct
+
+### Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+nationality, personal appearance, race, religion, or sexual identity and
+orientation.
+
+### Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+- Using welcoming and inclusive language
+- Being respectful of differing viewpoints and experiences
+- Gracefully accepting constructive criticism
+- Focusing on what is best for the community
+- Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+- The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+- Trolling, insulting/derogatory comments, and personal or political attacks
+- Public or private harassment
+- Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+- Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+### Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+### Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+### Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at [abuse@zeit.co](mailto:abuse@zeit.co). All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+### Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/

README.md

@@ -1,21 +1,43 @@
 # now-builders
 
-This is the full list of official Builders provided by the ZEIT team.
+This is a monorepo containing the [Official Builders](https://zeit.co/docs/v2/deployments/builders/overview) provided by the ZEIT team.
 
-More details here: http://zeit.co/docs
+## Channels
+
+There are two Channels:
+
+| Channel | Git Branch | npm dist-tag | use example        |
+| ------- | ---------- | ------------ | ------------------ |
+| Canary  | `canary`   | `@canary`    | `@now/node@canary` |
+| Stable  | `master`   | `@latest`    | `@now/node@latest` |
+
+All PRs should be submitted to the `canary` branch.
+
+Once a PR is merged into the `canary` branch, it should be published to npm immediately using the Canary Channel.
 
 ### Publishing to npm
 
-Run the following command to publish modified builders to npm:
-
-For the stable channel use:
-
-```
-yarn publish-stable
-```
-
-For the canary channel use:
+For the Canary Channel, publish the modified Builders to npm with the following:
 
 ```
 yarn publish-canary
 ```
+
+For the Stable Channel, you must cherry pick each commit from canary to master and then deploy the modified Builders:
+
+```
+git checkout master
+git pull      # make sure you're up to date
+git cherry-pick <PR501_COMMIT_SHA>
+git cherry-pick <PR502_COMMIT_SHA>
+git cherry-pick <PR503_COMMIT_SHA>
+git cherry-pick <PR504_COMMIT_SHA>
+# ... etc ...
+yarn publish-stable
+```
+
+After running this publish step, GitHub Actions will take care of publishing the modified Builder packages to npm.
+
+If for some reason GitHub Actions fails to publish the npm package, you may do so
+manually by running `npm publish` from the package directory. Make sure to
+use `npm publish --tag canary` if you are publishing a canary release!

errors/now-next-legacy-mode.md

@@ -0,0 +1,72 @@
+# `@now/next` Legacy Mode
+
+#### Why This Warning Occurred
+
+`@now/next` has two modes: `legacy` and `serverless`. You will always want to use the `serverless` mode. `legacy` is to provide backwards compatibility with previous `@now/next` versions.
+
+The differences:
+
+Legacy:
+
+- Minimal lambda size of `2.2Mb` (approximately)
+- Forces `next@v7.0.2-canary.49` and `next-server@v7.0.2-canary.49`
+- Forces all `dependencies` to be `devDependencies`
+- Loads `next.config.js` on bootup, breaking sometimes when users didn't use `phases` to load files
+- Used `next-server` which is the full Next.js server with routing etc.
+- Runs `npm install`
+- Runs `npm run now-build`
+- Runs `npm install --production` after build
+
+Serverless:
+
+- Minimal lambda size of `49Kb` (approximately)
+- Uses Next.js build targets (`target: 'serverless'`) in `next.config.js`. [documentation](https://github.com/zeit/next.js#summary)
+- Does not make changes to your application dependencies
+- Does not load `next.config.js` ([as per the serverless target documentation](https://github.com/zeit/next.js#summary))
+- Runs `npm install`
+- Runs `npm run now-build`
+- Does not run `npm install --production` as the output from the build is all that's needed to bundle lambdas.
+- No runtime dependencies, meaning smaller lambda functions
+- Optimized for fast [cold start](https://zeit.co/blog/serverless-ssr#cold-start)
+
+#### Possible Ways to Fix It
+
+In order to create the smallest possible lambdas Next.js has to be configured to build for the `serverless` target.
+
+1. Serverless Next.js requires Next.js 8 or later, to upgrade you can install the `latest` version:
+
+```
+npm install next --save
+```
+
+2. Add the `now-build` script to your `package.json`
+
+```json
+{
+  "scripts": {
+    "now-build": "next build"
+  }
+}
+```
+
+3. Add `target: 'serverless'` to `next.config.js`
+
+```js
+module.exports = {
+  target: 'serverless',
+  // Other options are still valid
+};
+```
+
+4. Optionally make sure the `"src"` in `"builds"` points to your application `package.json`
+
+```js
+{
+  "version": 2,
+  "builds": [{ "src": "package.json", "use": "@now/next" }]
+}
+```
+
+### Useful Links
+
+- [Serverless target implementation](https://github.com/zeit/now-builders/pull/150)

errors/now-next-no-serverless-pages-built.md

@@ -0,0 +1,45 @@
+# `@now/next` No Serverless Pages Built
+
+#### Why This Error Occurred
+
+This error occurs when you have your application is not configured for Serverless Next.js build output.
+
+#### Possible Ways to Fix It
+
+In order to create the smallest possible lambdas Next.js has to be configured to build for the `serverless` target.
+
+1. Serverless Next.js requires Next.js 8 or later, to upgrade you can install the `latest` version:
+
+```
+npm install next --save
+```
+
+2. Add the `now-build` script to your `package.json`
+
+```json
+{
+  "scripts": {
+    "now-build": "next build"
+  }
+}
+```
+
+3. Add `target: 'serverless'` to `next.config.js`
+
+```js
+module.exports = {
+  target: 'serverless',
+  // Other options
+};
+```
+
+4. Remove `distDir` from `next.config.js` as `@now/next` can't parse this file and expects your build output at `/.next`
+
+5. Optionally make sure the `"src"` in `"builds"` points to your application `package.json`
+
+```js
+{
+  "version": 2,
+  "builds": [{ "src": "package.json", "use": "@now/next" }]
+}
+```

errors/now-static-build-failed-to-detect-a-server.md

@@ -0,0 +1,38 @@
+# `@now/static-build` Failed to detect a server running
+
+#### Why This Warning Occurred
+
+When running `now dev`, the `@now/static-build` builder proxies relevant HTTP
+requests to the server that is created by the `now-dev` script in the
+`package.json` file.
+
+In order for `now dev` to know which port the server is running on, the builder
+is provided a `$PORT` environment variable that the server _must_ bind to. The
+error "Failed to detect a server running on port" is printed if the builder fails
+to detect a server listening on that specific port within five minutes.
+
+#### Possible Ways to Fix It
+
+Please ensure that your `now-dev` script binds the spawned development server on
+the provided `$PORT` that the builder expects the server to bind to.
+
+For example, if you are using Gatsby, your `now-dev` script must use the `-p`
+(port) option to bind to the `$PORT` specified from the builder:
+
+```
+{
+  ...
+  "scripts": {
+    ...
+    "now-dev": "gatsby develop -p $PORT"
+  }
+}
+```
+
+Consult your static builder program's `--help` or documentation to figure out what
+the command line flag to bind to a specific port is (in many cases, it is one of:
+`-p` / `-P` / `--port`).
+
+### Useful Links
+
+- [`@now/static-build` Local Development Documentation](https://zeit.co/docs/v2/deployments/official-builders/static-build-now-static-build#local-development)

jest.config.js

@@ -1,4 +1,40 @@
+const childProcess = require('child_process');
+const path = require('path');
+
+const command = 'git diff HEAD~1 --name-only';
+const diff = childProcess.execSync(command).toString();
+
+const changed = diff
+  .split('\n')
+  .filter(item => Boolean(item) && item.includes('packages/'))
+  .map(item => path.relative('packages', item).split('/')[0]);
+
+const matches = [];
+
+if (changed.length > 0) {
+  console.log('The following packages have changed:');
+
+  changed.map((item) => {
+    matches.push(item);
+    console.log(item);
+
+    return null;
+  });
+} else {
+  matches.push('now-node');
+  console.log(`No packages changed, defaulting to ${matches[0]}`);
+}
+
+const testMatch = Array.from(new Set(matches)).map(
+  item => `**/${item}/**/?(*.)+(spec|test).[jt]s?(x)`,
+);
+
 module.exports = {
   testEnvironment: 'node',
-  rootDir: 'test',
+  testMatch,
+  collectCoverageFrom: [
+    'packages/(!test)/**/*.{js,jsx}',
+    '!**/node_modules/**',
+    '!**/test/**',
+  ],
 };

lerna.json

@@ -1,9 +1,7 @@
 {
   "npmClient": "yarn",
   "useWorkspaces": true,
-  "packages": [
-    "packages/*"
-  ],
+  "packages": ["packages/*"],
   "command": {
     "publish": {
       "npmClient": "npm",

package.json

@@ -1,5 +1,6 @@
 {
   "name": "now-builders",
+  "version": "0.0.0",
   "private": true,
   "license": "MIT",
   "dependencies": {
@@ -11,28 +12,54 @@
   "scripts": {
     "lerna": "lerna",
     "bootstrap": "lerna bootstrap",
-    "publish-stable": "lerna version",
-    "publish-canary": "lerna version prerelease --preid canary",
+    "publish-stable": "git checkout master && git pull && lerna version",
+    "publish-canary": "git checkout canary && git pull && lerna version prerelease --preid canary",
+    "publish-from-github": "./.circleci/publish.sh",
+    "build": "./.circleci/build.sh",
     "lint": "eslint .",
-    "test": "jest",
+    "codecov": "codecov",
+    "test": "jest --runInBand --verbose",
+    "test-coverage": "jest --runInBand --verbose --coverage --globals \"{\\\"coverage\\\":true}\" && codecov",
     "lint-staged": "lint-staged"
   },
   "pre-commit": "lint-staged",
   "lint-staged": {
     "*.js": [
-      "eslint",
-      "prettier --write --single-quote",
+      "prettier --write",
+      "eslint --fix",
+      "git add"
+    ],
+    "*.ts": [
+      "prettier --write",
+      "git add"
+    ],
+    "*.md": [
+      "prettier --write",
       "git add"
     ]
   },
   "devDependencies": {
+    "@types/fs-extra": "^5.0.4",
+    "@types/glob": "^7.1.1",
+    "@types/multistream": "^2.1.1",
+    "@types/node": "^10.12.8",
+    "async-retry": "1.2.3",
+    "buffer-replace": "^1.0.0",
+    "codecov": "^3.2.0",
     "eslint": "^5.9.0",
     "eslint-config-airbnb-base": "^13.1.0",
     "eslint-config-prettier": "^3.1.0",
     "eslint-plugin-import": "^2.14.0",
+    "fs-extra": "^7.0.1",
+    "glob": "^7.1.3",
     "jest": "^23.6.0",
     "lint-staged": "^8.0.4",
+    "node-fetch": "^2.3.0",
     "pre-commit": "^1.2.2",
-    "prettier": "^1.15.2"
+    "prettier": "1.17.1"
+  },
+  "prettier": {
+    "singleQuote": true,
+    "trailingComma": "es5"
   }
 }

packages/now-bash/.editorconfig

@@ -0,0 +1,32 @@
+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+tab_width = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{*.json,*.json.example,*.gyp,*.yml}]
+indent_style = space
+indent_size = 2
+
+[*.py]
+indent_style = space
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false
+
+# Ideal settings - some plugins might support these.
+[*.js]
+quote_type = single
+
+[{*.c,*.cc,*.h,*.hh,*.cpp,*.hpp,*.m,*.mm,*.mpp,*.js,*.java,*.go,*.rs,*.php,*.ng,*.jsx,*.ts,*.d,*.cs,*.swift}]
+curly_bracket_next_line = false
+spaces_around_operators = true
+spaces_around_brackets = outside
+# close enough to 1TB
+indent_brace_style = K&R

packages/now-bash/.gitignore

@@ -0,0 +1,2 @@
+node_modules
+handler

packages/now-bash/bootstrap

@@ -0,0 +1,16 @@
+#!/bin/bash
+set -euo pipefail
+cd "$LAMBDA_TASK_ROOT"
+
+# Configure `import`
+export IMPORT_CACHE="$LAMBDA_TASK_ROOT/.import-cache"
+export PATH="$IMPORT_CACHE/bin:$PATH"
+
+# Load `import` and runtime
+# shellcheck disable=SC1090
+. "$(which import)"
+# shellcheck disable=SC1090
+. "$IMPORT_CACHE/runtime.sh"
+
+# Load user code and process events in a loop forever
+_lambda_runtime_init

packages/now-bash/builder.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+set -euo pipefail
+
+# `import` debug logs are always enabled during build
+export IMPORT_DEBUG=1
+
+# Install `import`
+IMPORT_BIN="$IMPORT_CACHE/bin/import"
+mkdir -p "$(dirname "$IMPORT_BIN")"
+curl -sfLS https://import.pw > "$IMPORT_BIN"
+chmod +x "$IMPORT_BIN"
+
+# For now only the entrypoint file is copied into the lambda
+mkdir -p "$(dirname "$ENTRYPOINT")"
+cp "$SRC/$ENTRYPOINT" "$ENTRYPOINT"
+
+# Copy in the runtime
+cp "$BUILDER/runtime.sh" "$IMPORT_CACHE"
+cp "$BUILDER/bootstrap" .
+
+# Load `import`
+. "$(which import)"
+
+# Cache runtime and user dependencies
+echo "Caching imports in \"$ENTRYPOINT\"…"
+. "$IMPORT_CACHE/runtime.sh"
+. "$ENTRYPOINT"
+echo "Done caching imports"
+
+# Run user build script
+if declare -f build > /dev/null; then
+	echo "Running \`build\` function in \"$ENTRYPOINT\"…"
+	build "$@"
+fi
+
+# Ensure the entrypoint defined a `handler` function
+if ! declare -f handler > /dev/null; then
+	echo "ERROR: A \`handler\` function must be defined in \"$ENTRYPOINT\"!" >&2
+	exit 1
+fi

packages/now-bash/index.js

@@ -0,0 +1,62 @@
+const execa = require('execa');
+const { join } = require('path');
+const snakeCase = require('snake-case');
+const {
+  glob,
+  download,
+  createLambda,
+  getWriteableDirectory,
+  shouldServe,
+} = require('@now/build-utils'); // eslint-disable-line import/no-extraneous-dependencies
+
+exports.config = {
+  maxLambdaSize: '10mb',
+};
+
+exports.analyze = ({ files, entrypoint }) => files[entrypoint].digest;
+
+exports.build = async ({
+  workPath, files, entrypoint, config,
+}) => {
+  const srcDir = await getWriteableDirectory();
+
+  console.log('downloading files...');
+  await download(files, srcDir);
+
+  const configEnv = Object.keys(config).reduce((o, v) => {
+    o[`IMPORT_${snakeCase(v).toUpperCase()}`] = config[v]; // eslint-disable-line no-param-reassign
+    return o;
+  }, {});
+
+  const IMPORT_CACHE = `${workPath}/.import-cache`;
+  const env = Object.assign({}, process.env, configEnv, {
+    PATH: `${IMPORT_CACHE}/bin:${process.env.PATH}`,
+    IMPORT_CACHE,
+    SRC: srcDir,
+    BUILDER: __dirname,
+    ENTRYPOINT: entrypoint,
+  });
+
+  const builderPath = join(__dirname, 'builder.sh');
+
+  await execa(builderPath, [entrypoint], {
+    env,
+    cwd: workPath,
+    stdio: 'inherit',
+  });
+
+  const lambda = await createLambda({
+    files: await glob('**', workPath),
+    handler: entrypoint, // not actually used in `bootstrap`
+    runtime: 'provided',
+    environment: Object.assign({}, configEnv, {
+      SCRIPT_FILENAME: entrypoint,
+    }),
+  });
+
+  return {
+    [entrypoint]: lambda,
+  };
+};
+
+exports.shouldServe = shouldServe;

packages/now-bash/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "@now/bash",
+  "version": "0.2.3",
+  "description": "Now 2.0 builder for HTTP endpoints written in Bash",
+  "main": "index.js",
+  "author": "Nathan Rajlich <nate@zeit.co>",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/zeit/now-builders.git",
+    "directory": "packages/now-bash"
+  },
+  "files": [
+    "builder.sh",
+    "runtime.sh",
+    "bootstrap",
+    "index.js",
+    "package.json"
+  ],
+  "dependencies": {
+    "execa": "^1.0.0",
+    "snake-case": "^2.1.0"
+  }
+}

packages/now-bash/runtime.sh

@@ -0,0 +1,119 @@
+#!/bin/bash
+import "static-binaries@1.0.0"
+static_binaries jq
+
+# These get reset upon each request
+_STATUS_CODE="$(mktemp)"
+_HEADERS="$(mktemp)"
+
+_lambda_runtime_api() {
+	local endpoint="$1"
+	shift
+	curl -sfLS "http://$AWS_LAMBDA_RUNTIME_API/2018-06-01/runtime/$endpoint" "$@"
+}
+
+_lambda_runtime_init() {
+	# Initialize user code
+	# shellcheck disable=SC1090
+	. "$SCRIPT_FILENAME" || {
+		local exit_code="$?"
+		local error_message="Initialization failed for '$SCRIPT_FILENAME' (exit code $exit_code)"
+		echo "$error_message" >&2
+		local error='{"errorMessage":"'"$error_message"'"}'
+		_lambda_runtime_api "init/error" -X POST -d "$error"
+		exit "$exit_code"
+	}
+
+	# Process events
+	while true; do _lambda_runtime_next; done
+}
+
+_lambda_runtime_next() {
+	echo 200 > "$_STATUS_CODE"
+	echo '{"content-type":"text/plain; charset=utf8"}' > "$_HEADERS"
+
+	local headers
+	headers="$(mktemp)"
+
+	# Get an event
+	local event
+	event="$(mktemp)"
+	_lambda_runtime_api invocation/next -D "$headers" | jq --raw-output --monochrome-output '.body' > "$event"
+
+	local request_id
+	request_id="$(grep -Fi Lambda-Runtime-Aws-Request-Id "$headers" | tr -d '[:space:]' | cut -d: -f2)"
+	rm -f "$headers"
+
+	# Execute the handler function from the script
+	local body
+	body="$(mktemp)"
+
+	# Stdin of the `handler` function is the HTTP request body.
+	# Need to use a fifo here instead of bash <() because Lambda
+	# errors with "/dev/fd/63 not found" for some reason :/
+	local stdin
+	stdin="$(mktemp -u)"
+	mkfifo "$stdin"
+	_lambda_runtime_body < "$event" > "$stdin" &
+
+	local exit_code=0
+	handler "$event" < "$stdin" > "$body" || exit_code="$?"
+
+	rm -f "$event" "$stdin"
+
+	if [ "$exit_code" -eq 0 ]; then
+		# Send the response
+		jq --raw-input --raw-output --compact-output --slurp --monochrome-output \
+			--arg statusCode "$(cat "$_STATUS_CODE")" \
+			--argjson headers "$(cat "$_HEADERS")" \
+			'{statusCode:$statusCode|tonumber, headers:$headers, encoding:"base64", body:.|@base64}' < "$body" \
+			| _lambda_runtime_api "invocation/$request_id/response" -X POST -d @- > /dev/null
+		rm -f "$body" "$_HEADERS"
+	else
+		local error_message="Invocation failed for 'handler' function in '$SCRIPT_FILENAME' (exit code $exit_code)"
+		echo "$error_message" >&2
+		_lambda_runtime_api "invocation/$request_id/error" -X POST -d '{"errorMessage":"'"$error_message"'"}' > /dev/null
+	fi
+}
+
+_lambda_runtime_body() {
+	local event
+	event="$(cat)"
+	if [ "$(jq --raw-output '.body | type' <<< "$event")" = "string" ]; then
+		if [ "$(jq --raw-output '.encoding' <<< "$event")" = "base64" ]; then
+			jq --raw-output '.body' <<< "$event" | base64 --decode
+		else
+			# assume plain-text body
+			jq --raw-output '.body' <<< "$event"
+		fi
+	fi
+}
+
+
+# Set the response status code.
+http_response_code() {
+	echo "$1" > "$_STATUS_CODE"
+}
+
+# Sets a response header.
+# Overrides existing header if it has already been set.
+http_response_header() {
+	local name="$1"
+	local value="$2"
+	local tmp
+	tmp="$(mktemp)"
+	jq \
+		--arg name "$name" \
+		--arg value "$value" \
+		'.[$name] = $value' < "$_HEADERS" > "$tmp"
+	mv -f "$tmp" "$_HEADERS"
+}
+
+http_response_redirect() {
+	http_response_code "${2:-302}"
+	http_response_header "location" "$1"
+}
+
+http_response_json() {
+	http_response_header "content-type" "application/json; charset=utf8"
+}

packages/now-bash/yarn.lock

@@ -0,0 +1,146 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+cross-spawn@^6.0.0:
+  version "6.0.5"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-6.0.5.tgz#4a5ec7c64dfae22c3a14124dbacdee846d80cbc4"
+  integrity sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==
+  dependencies:
+    nice-try "^1.0.4"
+    path-key "^2.0.1"
+    semver "^5.5.0"
+    shebang-command "^1.2.0"
+    which "^1.2.9"
+
+end-of-stream@^1.1.0:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/end-of-stream/-/end-of-stream-1.4.1.tgz#ed29634d19baba463b6ce6b80a37213eab71ec43"
+  integrity sha512-1MkrZNvWTKCaigbn+W15elq2BB/L22nqrSY5DKlo3X6+vclJm8Bb5djXJBmEX6fS3+zCh/F4VBK5Z2KxJt4s2Q==
+  dependencies:
+    once "^1.4.0"
+
+execa@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/execa/-/execa-1.0.0.tgz#c6236a5bb4df6d6f15e88e7f017798216749ddd8"
+  integrity sha512-adbxcyWV46qiHyvSp50TKt05tB4tK3HcmF7/nxfAdhnox83seTDbwnaqKO4sXRy7roHAIFqJP/Rw/AuEbX61LA==
+  dependencies:
+    cross-spawn "^6.0.0"
+    get-stream "^4.0.0"
+    is-stream "^1.1.0"
+    npm-run-path "^2.0.0"
+    p-finally "^1.0.0"
+    signal-exit "^3.0.0"
+    strip-eof "^1.0.0"
+
+get-stream@^4.0.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-4.1.0.tgz#c1b255575f3dc21d59bfc79cd3d2b46b1c3a54b5"
+  integrity sha512-GMat4EJ5161kIy2HevLlr4luNjBgvmj413KaQA7jt4V8B4RDsfpHk7WQ9GVqfYyyx8OS/L66Kox+rJRNklLK7w==
+  dependencies:
+    pump "^3.0.0"
+
+is-stream@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
+  integrity sha1-EtSj3U5o4Lec6428hBc66A2RykQ=
+
+isexe@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/isexe/-/isexe-2.0.0.tgz#e8fbf374dc556ff8947a10dcb0572d633f2cfa10"
+  integrity sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=
+
+lower-case@^1.1.1:
+  version "1.1.4"
+  resolved "https://registry.yarnpkg.com/lower-case/-/lower-case-1.1.4.tgz#9a2cabd1b9e8e0ae993a4bf7d5875c39c42e8eac"
+  integrity sha1-miyr0bno4K6ZOkv31YdcOcQujqw=
+
+nice-try@^1.0.4:
+  version "1.0.5"
+  resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.5.tgz#a3378a7696ce7d223e88fc9b764bd7ef1089e366"
+  integrity sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ==
+
+no-case@^2.2.0:
+  version "2.3.2"
+  resolved "https://registry.yarnpkg.com/no-case/-/no-case-2.3.2.tgz#60b813396be39b3f1288a4c1ed5d1e7d28b464ac"
+  integrity sha512-rmTZ9kz+f3rCvK2TD1Ue/oZlns7OGoIWP4fc3llxxRXlOkHKoWPPWJOfFYpITabSow43QJbRIoHQXtt10VldyQ==
+  dependencies:
+    lower-case "^1.1.1"
+
+npm-run-path@^2.0.0:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/npm-run-path/-/npm-run-path-2.0.2.tgz#35a9232dfa35d7067b4cb2ddf2357b1871536c5f"
+  integrity sha1-NakjLfo11wZ7TLLd8jV7GHFTbF8=
+  dependencies:
+    path-key "^2.0.0"
+
+once@^1.3.1, once@^1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
+  integrity sha1-WDsap3WWHUsROsF9nFC6753Xa9E=
+  dependencies:
+    wrappy "1"
+
+p-finally@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/p-finally/-/p-finally-1.0.0.tgz#3fbcfb15b899a44123b34b6dcc18b724336a2cae"
+  integrity sha1-P7z7FbiZpEEjs0ttzBi3JDNqLK4=
+
+path-key@^2.0.0, path-key@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/path-key/-/path-key-2.0.1.tgz#411cadb574c5a140d3a4b1910d40d80cc9f40b40"
+  integrity sha1-QRyttXTFoUDTpLGRDUDYDMn0C0A=
+
+pump@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/pump/-/pump-3.0.0.tgz#b4a2116815bde2f4e1ea602354e8c75565107a64"
+  integrity sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==
+  dependencies:
+    end-of-stream "^1.1.0"
+    once "^1.3.1"
+
+semver@^5.5.0:
+  version "5.6.0"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-5.6.0.tgz#7e74256fbaa49c75aa7c7a205cc22799cac80004"
+  integrity sha512-RS9R6R35NYgQn++fkDWaOmqGoj4Ek9gGs+DPxNUZKuwE183xjJroKvyo1IzVFeXvUrvmALy6FWD5xrdJT25gMg==
+
+shebang-command@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/shebang-command/-/shebang-command-1.2.0.tgz#44aac65b695b03398968c39f363fee5deafdf1ea"
+  integrity sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=
+  dependencies:
+    shebang-regex "^1.0.0"
+
+shebang-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-1.0.0.tgz#da42f49740c0b42db2ca9728571cb190c98efea3"
+  integrity sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=
+
+signal-exit@^3.0.0:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
+  integrity sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=
+
+snake-case@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/snake-case/-/snake-case-2.1.0.tgz#41bdb1b73f30ec66a04d4e2cad1b76387d4d6d9f"
+  integrity sha1-Qb2xtz8w7GagTU4srRt2OH1NbZ8=
+  dependencies:
+    no-case "^2.2.0"
+
+strip-eof@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/strip-eof/-/strip-eof-1.0.0.tgz#bb43ff5598a6eb05d89b59fcd129c983313606bf"
+  integrity sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=
+
+which@^1.2.9:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/which/-/which-1.3.1.tgz#a45043d54f5805316da8d62f9f50918d3da70b0a"
+  integrity sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==
+  dependencies:
+    isexe "^2.0.0"
+
+wrappy@1:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
+  integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=

packages/now-build-utils/.gitignore

@@ -0,0 +1,3 @@
+dist
+test/symlinks-out
+test/symlinks.zip

packages/now-build-utils/.npmignore

@@ -0,0 +1,3 @@
+/src
+/test
+tmp

packages/now-build-utils/file-blob.js

@@ -1,33 +1 @@
-const assert = require('assert');
-const intoStream = require('into-stream');
-
-class FileBlob {
-  constructor({ mode = 0o100644, data }) {
-    assert(typeof mode === 'number');
-    assert(typeof data === 'string' || Buffer.isBuffer(data));
-    this.type = 'FileBlob';
-    this.mode = mode;
-    this.data = data;
-  }
-
-  static async fromStream({ mode = 0o100644, stream }) {
-    assert(typeof mode === 'number');
-    assert(typeof stream.pipe === 'function'); // is-stream
-    const chunks = [];
-
-    await new Promise((resolve, reject) => {
-      stream.on('data', chunk => chunks.push(Buffer.from(chunk)));
-      stream.on('error', error => reject(error));
-      stream.on('end', () => resolve());
-    });
-
-    const data = Buffer.concat(chunks);
-    return new FileBlob({ mode, data });
-  }
-
-  toStream() {
-    return intoStream(this.data);
-  }
-}
-
-module.exports = FileBlob;
+module.exports = require('./dist/index').FileBlob;

packages/now-build-utils/file-fs-ref.js

@@ -1,62 +1 @@
-const assert = require('assert');
-const fs = require('fs-extra');
-const MultiStream = require('multistream');
-const path = require('path');
-const Sema = require('async-sema');
-
-const semaToPreventEMFILE = new Sema(30);
-
-class FileFsRef {
-  constructor({ mode = 0o100644, fsPath }) {
-    assert(typeof mode === 'number');
-    assert(typeof fsPath === 'string');
-    this.type = 'FileFsRef';
-    this.mode = mode;
-    this.fsPath = fsPath;
-  }
-
-  static async fromStream({ mode = 0o100644, stream, fsPath }) {
-    assert(typeof mode === 'number');
-    assert(typeof stream.pipe === 'function'); // is-stream
-    assert(typeof fsPath === 'string');
-    await fs.mkdirp(path.dirname(fsPath));
-
-    await new Promise((resolve, reject) => {
-      const dest = fs.createWriteStream(fsPath);
-      stream.pipe(dest);
-      stream.on('error', error => reject(error));
-      dest.on('finish', () => resolve());
-      dest.on('error', error => reject(error));
-    });
-
-    await fs.chmod(fsPath, mode.toString(8).slice(-3));
-    return new FileFsRef({ mode, fsPath });
-  }
-
-  async toStreamAsync() {
-    await semaToPreventEMFILE.acquire();
-    const release = () => semaToPreventEMFILE.release();
-    const stream = fs.createReadStream(this.fsPath);
-    stream.on('end', release);
-    stream.on('error', release);
-    return stream;
-  }
-
-  toStream() {
-    let flag;
-
-    // eslint-disable-next-line consistent-return
-    return new MultiStream((cb) => {
-      if (flag) return cb();
-      flag = true;
-
-      this.toStreamAsync().then((stream) => {
-        cb(undefined, stream);
-      }).catch((error) => {
-        cb(error);
-      });
-    });
-  }
-}
-
-module.exports = FileFsRef;
+module.exports = require('./dist/index').FileFsRef;

packages/now-build-utils/file-ref.js

@@ -1,64 +1 @@
-const assert = require('assert');
-const fetch = require('node-fetch');
-const MultiStream = require('multistream');
-const retry = require('async-retry');
-const Sema = require('async-sema');
-
-const semaToDownloadFromS3 = new Sema(10);
-
-class FileRef {
-  constructor({ mode = 0o100644, digest }) {
-    assert(typeof mode === 'number');
-    assert(typeof digest === 'string');
-    this.type = 'FileRef';
-    this.mode = mode;
-    this.digest = digest;
-  }
-
-  async toStreamAsync() {
-    let url;
-    // sha:24be087eef9fac01d61b30a725c1a10d7b45a256
-    const digestParts = this.digest.split(':');
-    if (digestParts[0] === 'sha') {
-      // url = `https://s3.amazonaws.com/now-files/${digestParts[1]}`;
-      url = `https://dmmcy0pwk6bqi.cloudfront.net/${digestParts[1]}`;
-    }
-
-    assert(url);
-
-    await semaToDownloadFromS3.acquire();
-    console.time(`downloading ${url}`);
-    try {
-      return await retry(async () => {
-        const resp = await fetch(url);
-        if (!resp.ok) {
-          const error = new Error(`${resp.status} ${resp.statusText}`);
-          if (resp.status === 403) error.bail = true;
-          throw error;
-        }
-        return resp.body;
-      }, { factor: 1, retries: 3 });
-    } finally {
-      console.timeEnd(`downloading ${url}`);
-      semaToDownloadFromS3.release();
-    }
-  }
-
-  toStream() {
-    let flag;
-
-    // eslint-disable-next-line consistent-return
-    return new MultiStream((cb) => {
-      if (flag) return cb();
-      flag = true;
-
-      this.toStreamAsync().then((stream) => {
-        cb(undefined, stream);
-      }).catch((error) => {
-        cb(error);
-      });
-    });
-  }
-}
-
-module.exports = FileRef;
+module.exports = require('./dist/index').FileRef;

packages/now-build-utils/fs/download.js

@@ -1,20 +1 @@
-const path = require('path');
-const FileFsRef = require('../file-fs-ref.js');
-
-async function downloadFile(file, fsPath) {
-  const { mode } = file;
-  const stream = file.toStream();
-  return FileFsRef.fromStream({ mode, stream, fsPath });
-}
-
-module.exports = async function download(files, basePath) {
-  const files2 = {};
-
-  await Promise.all(Object.keys(files).map(async (name) => {
-    const file = files[name];
-    const fsPath = path.join(basePath, name);
-    files2[name] = await downloadFile(file, fsPath);
-  }));
-
-  return files2;
-};
+module.exports = require('../dist/fs/download').default;

packages/now-build-utils/fs/get-writable-directory.js

@@ -1,12 +1 @@
-const path = require('path');
-const fs = require('fs-extra');
-
-const dev = !process.env.AWS_EXECUTION_ENV;
-const TMP_PATH = dev ? path.join(process.cwd(), 'tmp') : '/tmp';
-
-module.exports = async function getWritableDirectory() {
-  const name = Math.floor(Math.random() * 0x7fffffff).toString(16);
-  const directory = path.join(TMP_PATH, name);
-  await fs.mkdirp(directory);
-  return directory;
-};
+module.exports = require('../dist/fs/get-writable-directory').default;

packages/now-build-utils/fs/glob.js

@@ -1,46 +1 @@
-const assert = require('assert');
-const path = require('path');
-const vanillaGlob = require('glob');
-const FileFsRef = require('../file-fs-ref.js');
-
-module.exports = function glob(pattern, opts = {}, mountpoint) {
-  return new Promise((resolve, reject) => {
-    let options = opts;
-    if (typeof options === 'string') {
-      options = { cwd: options };
-    }
-
-    if (!options.cwd) {
-      throw new Error('Second argument (basePath) must be specified for names of resulting files');
-    }
-
-    if (!path.isAbsolute(options.cwd)) {
-      throw new Error(`basePath/cwd must be an absolute path (${options.cwd})`);
-    }
-
-    options.statCache = {};
-    options.stat = true;
-    options.dot = true;
-
-    // eslint-disable-next-line consistent-return
-    vanillaGlob(pattern, options, (error, files) => {
-      if (error) return reject(error);
-
-      resolve(files.reduce((files2, relativePath) => {
-        const fsPath = path.join(options.cwd, relativePath);
-        const stat = options.statCache[fsPath];
-        assert(stat, `statCache does not contain value for ${relativePath} (resolved to ${fsPath})`);
-        if (stat.isFile()) {
-          let finalPath = relativePath;
-          if (mountpoint) finalPath = path.join(mountpoint, finalPath);
-          return {
-            ...files2,
-            [finalPath]: new FileFsRef({ mode: stat.mode, fsPath }),
-          };
-        }
-
-        return files2;
-      }, {}));
-    });
-  });
-};
+module.exports = require('../dist/fs/glob').default;

packages/now-build-utils/fs/rename.js

@@ -1,6 +1 @@
-module.exports = function rename(files, delegate) {
-  return Object.keys(files).reduce((newFiles, name) => ({
-    ...newFiles,
-    [delegate(name)]: files[name],
-  }), {});
-};
+module.exports = require('../dist/fs/rename').default;

packages/now-build-utils/fs/run-user-scripts.js

@@ -1,72 +1 @@
-const fs = require('fs-extra');
-const path = require('path');
-const { spawn } = require('child_process');
-
-function spawnAsync(command, args, cwd) {
-  return new Promise((resolve, reject) => {
-    const child = spawn(command, args, { stdio: 'inherit', cwd });
-    child.on('error', reject);
-    child.on('close', (code, signal) => (code !== 0 ? reject(new Error(`Exited with ${code || signal}`)) : resolve()));
-  });
-}
-
-async function runShellScript(fsPath) {
-  const destPath = path.dirname(fsPath);
-  await spawnAsync(`./${path.basename(fsPath)}`, [], destPath);
-  return true;
-}
-
-async function shouldUseNpm(destPath) {
-  let currentDestPath = destPath;
-  // eslint-disable-next-line no-constant-condition
-  while (true) {
-    // eslint-disable-next-line no-await-in-loop
-    if (await fs.exists(path.join(currentDestPath, 'package.json'))) {
-      // eslint-disable-next-line no-await-in-loop
-      if (await fs.exists(path.join(currentDestPath, 'package-lock.json'))) {
-        return true;
-      }
-      return false;
-    }
-
-    const newDestPath = path.dirname(currentDestPath);
-    if (currentDestPath === newDestPath) break;
-    currentDestPath = newDestPath;
-  }
-
-  return false;
-}
-
-async function runNpmInstall(destPath, args = []) {
-  let commandArgs = args;
-  console.log(`installing to ${destPath}`);
-  if (await shouldUseNpm(destPath)) {
-    commandArgs = args.filter(a => a !== '--prefer-offline');
-    await spawnAsync('npm', ['install'].concat(commandArgs), destPath);
-  } else {
-    await spawnAsync('yarn', ['--cwd', destPath].concat(commandArgs), destPath);
-  }
-}
-
-async function runPackageJsonScript(destPath, scriptName) {
-  try {
-    if (await shouldUseNpm(destPath)) {
-      console.log(`running "npm run ${scriptName}"`);
-      await spawnAsync('npm', ['run', scriptName], destPath);
-    } else {
-      console.log(`running "yarn run ${scriptName}"`);
-      await spawnAsync('yarn', ['--cwd', destPath, 'run', scriptName], destPath);
-    }
-  } catch (error) {
-    console.log(error.message);
-    return false;
-  }
-
-  return true;
-}
-
-module.exports = {
-  runShellScript,
-  runNpmInstall,
-  runPackageJsonScript,
-};
+module.exports = require('../dist/fs/run-user-scripts');

packages/now-build-utils/fs/stream-to-buffer.js

@@ -1,4 +1 @@
-const fastStreamToBuffer = require('fast-stream-to-buffer');
-const { promisify } = require('util');
-
-module.exports = promisify(fastStreamToBuffer);
+module.exports = require('../dist/fs/stream-to-buffer').default;

packages/now-build-utils/lambda.js

@@ -1,44 +1 @@
-const assert = require('assert');
-const { ZipFile } = require('yazl');
-const streamToBuffer = require('./fs/stream-to-buffer.js');
-
-class Lambda {
-  constructor({
-    zipBuffer, handler, runtime, environment,
-  }) {
-    this.type = 'Lambda';
-    this.zipBuffer = zipBuffer;
-    this.handler = handler;
-    this.runtime = runtime;
-    this.environment = environment;
-  }
-}
-
-const mtime = new Date(1540000000000);
-
-async function createLambda({
-  files, handler, runtime, environment = {},
-}) {
-  assert(typeof files === 'object', '"files" must be an object');
-  assert(typeof handler === 'string', '"handler" is not a string');
-  assert(typeof runtime === 'string', '"runtime" is not a string');
-  assert(typeof environment === 'object', '"environment" is not an object');
-  const zipFile = new ZipFile();
-
-  Object.keys(files).sort().forEach((name) => {
-    const file = files[name];
-    const stream = file.toStream();
-    zipFile.addReadStream(stream, name, { mode: file.mode, mtime });
-  });
-
-  zipFile.end();
-  const zipBuffer = await streamToBuffer(zipFile.outputStream);
-  return new Lambda({
-    zipBuffer, handler, runtime, environment,
-  });
-}
-
-module.exports = {
-  Lambda,
-  createLambda,
-};
+module.exports = require('./dist/index');

packages/now-build-utils/package.json

@@ -1,15 +1,41 @@
 {
   "name": "@now/build-utils",
-  "version": "0.4.27",
+  "version": "0.5.6",
+  "license": "MIT",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/zeit/now-builders.git",
+    "directory": "packages/now-build-utils"
+  },
   "dependencies": {
+    "@types/cross-spawn": "6.0.0",
     "async-retry": "1.2.3",
     "async-sema": "2.1.4",
-    "fast-stream-to-buffer": "1.0.0",
+    "cross-spawn": "6.0.5",
+    "end-of-stream": "1.4.1",
     "fs-extra": "7.0.0",
     "glob": "7.1.3",
-    "into-stream": "4.0.0",
+    "into-stream": "5.0.0",
+    "memory-fs": "0.4.1",
     "multistream": "2.1.1",
     "node-fetch": "2.2.0",
     "yazl": "2.4.3"
+  },
+  "scripts": {
+    "build": "tsc",
+    "test": "tsc && jest",
+    "prepublish": "tsc"
+  },
+  "devDependencies": {
+    "@types/async-retry": "^1.2.1",
+    "@types/end-of-stream": "^1.4.0",
+    "@types/fs-extra": "^5.0.5",
+    "@types/glob": "^7.1.1",
+    "@types/node-fetch": "^2.1.6",
+    "@types/yazl": "^2.4.1",
+    "execa": "^1.0.0",
+    "typescript": "3.3.4000"
   }
 }

packages/now-build-utils/src/file-blob.ts

@@ -0,0 +1,46 @@
+import assert from 'assert';
+import intoStream from 'into-stream';
+import { File } from './types';
+
+interface FileBlobOptions {
+  mode?: number;
+  data: string | Buffer;
+}
+
+interface FromStreamOptions {
+  mode?: number;
+  stream: NodeJS.ReadableStream;
+}
+
+export default class FileBlob implements File {
+  public type: 'FileBlob';
+  public mode: number;
+  public data: string | Buffer;
+
+  constructor({ mode = 0o100644, data }: FileBlobOptions) {
+    assert(typeof mode === 'number');
+    assert(typeof data === 'string' || Buffer.isBuffer(data));
+    this.type = 'FileBlob';
+    this.mode = mode;
+    this.data = data;
+  }
+
+  static async fromStream({ mode = 0o100644, stream }: FromStreamOptions) {
+    assert(typeof mode === 'number');
+    assert(typeof stream.pipe === 'function'); // is-stream
+    const chunks: Buffer[] = [];
+
+    await new Promise<void>((resolve, reject) => {
+      stream.on('data', chunk => chunks.push(Buffer.from(chunk)));
+      stream.on('error', error => reject(error));
+      stream.on('end', () => resolve());
+    });
+
+    const data = Buffer.concat(chunks);
+    return new FileBlob({ mode, data });
+  }
+
+  toStream(): NodeJS.ReadableStream {
+    return intoStream(this.data);
+  }
+}

packages/now-build-utils/src/file-fs-ref.ts

@@ -0,0 +1,97 @@
+import assert from 'assert';
+import fs from 'fs-extra';
+import multiStream from 'multistream';
+import path from 'path';
+import Sema from 'async-sema';
+import { File } from './types';
+
+const semaToPreventEMFILE = new Sema(20);
+
+interface FileFsRefOptions {
+  mode?: number;
+  fsPath: string;
+}
+
+interface FromStreamOptions {
+  mode: number;
+  stream: NodeJS.ReadableStream;
+  fsPath: string;
+}
+
+class FileFsRef implements File {
+  public type: 'FileFsRef';
+  public mode: number;
+  public fsPath: string;
+
+  constructor({ mode = 0o100644, fsPath }: FileFsRefOptions) {
+    assert(typeof mode === 'number');
+    assert(typeof fsPath === 'string');
+    this.type = 'FileFsRef';
+    this.mode = mode;
+    this.fsPath = fsPath;
+  }
+
+  static async fromFsPath({
+    mode,
+    fsPath,
+  }: FileFsRefOptions): Promise<FileFsRef> {
+    let m = mode;
+    if (!m) {
+      const stat = await fs.lstat(fsPath);
+      m = stat.mode;
+    }
+    return new FileFsRef({ mode: m, fsPath });
+  }
+
+  static async fromStream({
+    mode = 0o100644,
+    stream,
+    fsPath,
+  }: FromStreamOptions): Promise<FileFsRef> {
+    assert(typeof mode === 'number');
+    assert(typeof stream.pipe === 'function'); // is-stream
+    assert(typeof fsPath === 'string');
+    await fs.mkdirp(path.dirname(fsPath));
+
+    await new Promise<void>((resolve, reject) => {
+      const dest = fs.createWriteStream(fsPath, {
+        mode: mode & 0o777,
+      });
+      stream.pipe(dest);
+      stream.on('error', reject);
+      dest.on('finish', resolve);
+      dest.on('error', reject);
+    });
+
+    return new FileFsRef({ mode, fsPath });
+  }
+
+  async toStreamAsync(): Promise<NodeJS.ReadableStream> {
+    await semaToPreventEMFILE.acquire();
+    const release = () => semaToPreventEMFILE.release();
+    const stream = fs.createReadStream(this.fsPath);
+    stream.on('close', release);
+    stream.on('error', release);
+    return stream;
+  }
+
+  toStream(): NodeJS.ReadableStream {
+    let flag = false;
+
+    // eslint-disable-next-line consistent-return
+    return multiStream(cb => {
+      if (flag) return cb(null, null);
+      flag = true;
+
+      this.toStreamAsync()
+        .then(stream => {
+          cb(null, stream);
+        })
+        .catch(error => {
+          cb(error, null);
+        });
+    });
+  }
+}
+
+export = FileFsRef;

packages/now-build-utils/src/file-ref.ts

@@ -0,0 +1,95 @@
+import assert from 'assert';
+import fetch from 'node-fetch';
+import multiStream from 'multistream';
+import retry from 'async-retry';
+import Sema from 'async-sema';
+import { File } from './types';
+
+interface FileRefOptions {
+  mode?: number;
+  digest: string;
+}
+
+const semaToDownloadFromS3 = new Sema(5);
+
+class BailableError extends Error {
+  public bail: boolean;
+
+  constructor(...args: string[]) {
+    super(...args);
+    this.bail = false;
+  }
+}
+
+export default class FileRef implements File {
+  public type: 'FileRef';
+  public mode: number;
+  public digest: string;
+
+  constructor({ mode = 0o100644, digest }: FileRefOptions) {
+    assert(typeof mode === 'number');
+    assert(typeof digest === 'string');
+    this.type = 'FileRef';
+    this.mode = mode;
+    this.digest = digest;
+  }
+
+  async toStreamAsync(): Promise<NodeJS.ReadableStream> {
+    let url = '';
+    // sha:24be087eef9fac01d61b30a725c1a10d7b45a256
+    const [digestType, digestHash] = this.digest.split(':');
+    if (digestType === 'sha') {
+      // This CloudFront URL edge caches the `now-files` S3 bucket to prevent
+      // overloading it
+      // `https://now-files.s3.amazonaws.com/${digestHash}`
+      url = `https://dmmcy0pwk6bqi.cloudfront.net/${digestHash}`;
+    } else if (digestType === 'sha+ephemeral') {
+      // This URL is currently only used for cache files that constantly
+      // change. We shouldn't cache it on CloudFront because it'd always be a
+      // MISS.
+      url = `https://now-ephemeral-files.s3.amazonaws.com/${digestHash}`;
+    } else {
+      throw new Error('Expected digest to be sha');
+    }
+
+    await semaToDownloadFromS3.acquire();
+    // console.time(`downloading ${url}`);
+    try {
+      return await retry(
+        async () => {
+          const resp = await fetch(url);
+          if (!resp.ok) {
+            const error = new BailableError(
+              `download: ${resp.status} ${resp.statusText} for ${url}`
+            );
+            if (resp.status === 403) error.bail = true;
+            throw error;
+          }
+          return resp.body;
+        },
+        { factor: 1, retries: 3 }
+      );
+    } finally {
+      // console.timeEnd(`downloading ${url}`);
+      semaToDownloadFromS3.release();
+    }
+  }
+
+  toStream(): NodeJS.ReadableStream {
+    let flag = false;
+
+    // eslint-disable-next-line consistent-return
+    return multiStream(cb => {
+      if (flag) return cb(null, null);
+      flag = true;
+
+      this.toStreamAsync()
+        .then(stream => {
+          cb(null, stream);
+        })
+        .catch(error => {
+          cb(error, null);
+        });
+    });
+  }
+}

packages/now-build-utils/src/fs/download.ts

@@ -0,0 +1,75 @@
+import path from 'path';
+import FileFsRef from '../file-fs-ref';
+import { File, Files, Meta } from '../types';
+import { remove, mkdirp, readlink, symlink } from 'fs-extra';
+
+export interface DownloadedFiles {
+  [filePath: string]: FileFsRef;
+}
+
+const S_IFMT = 61440; /* 0170000 type of file */
+const S_IFLNK = 40960; /* 0120000 symbolic link */
+
+export function isSymbolicLink(mode: number): boolean {
+  return (mode & S_IFMT) === S_IFLNK;
+}
+
+async function downloadFile(file: File, fsPath: string): Promise<FileFsRef> {
+  const { mode } = file;
+  if (mode && isSymbolicLink(mode) && file.type === 'FileFsRef') {
+    const [target] = await Promise.all([
+      readlink((file as FileFsRef).fsPath),
+      mkdirp(path.dirname(fsPath)),
+    ]);
+    await symlink(target, fsPath);
+    return FileFsRef.fromFsPath({ mode, fsPath });
+  } else {
+    const stream = file.toStream();
+    return FileFsRef.fromStream({ mode, stream, fsPath });
+  }
+}
+
+async function removeFile(basePath: string, fileMatched: string) {
+  const file = path.join(basePath, fileMatched);
+  await remove(file);
+}
+
+export default async function download(
+  files: Files,
+  basePath: string,
+  meta?: Meta
+): Promise<DownloadedFiles> {
+  const { isDev = false, filesChanged = null, filesRemoved = null } =
+    meta || {};
+
+  if (isDev) {
+    // In `now dev`, the `download()` function is a no-op because
+    // the `basePath` matches the `cwd` of the dev server, so the
+    // source files are already available.
+    return files as DownloadedFiles;
+  }
+
+  const files2: DownloadedFiles = {};
+
+  await Promise.all(
+    Object.keys(files).map(async name => {
+      // If the file does not exist anymore, remove it.
+      if (Array.isArray(filesRemoved) && filesRemoved.includes(name)) {
+        await removeFile(basePath, name);
+        return;
+      }
+
+      // If a file didn't change, do not re-download it.
+      if (Array.isArray(filesChanged) && !filesChanged.includes(name)) {
+        return;
+      }
+
+      const file = files[name];
+      const fsPath = path.join(basePath, name);
+
+      files2[name] = await downloadFile(file, fsPath);
+    })
+  );
+
+  return files2;
+}

packages/now-build-utils/src/fs/get-writable-directory.ts

@@ -0,0 +1,10 @@
+import { join } from 'path';
+import { tmpdir } from 'os';
+import { mkdirp } from 'fs-extra';
+
+export default async function getWritableDirectory() {
+  const name = Math.floor(Math.random() * 0x7fffffff).toString(16);
+  const directory = join(tmpdir(), name);
+  await mkdirp(directory);
+  return directory;
+}

packages/now-build-utils/src/fs/glob.ts

@@ -0,0 +1,70 @@
+import path from 'path';
+import assert from 'assert';
+import vanillaGlob_ from 'glob';
+import { promisify } from 'util';
+import { lstat, Stats } from 'fs-extra';
+import FileFsRef from '../file-fs-ref';
+
+type GlobOptions = vanillaGlob_.IOptions;
+
+interface FsFiles {
+  [filePath: string]: FileFsRef;
+}
+
+const vanillaGlob = promisify(vanillaGlob_);
+
+export default async function glob(
+  pattern: string,
+  opts: GlobOptions | string,
+  mountpoint?: string
+): Promise<FsFiles> {
+  let options: GlobOptions;
+  if (typeof opts === 'string') {
+    options = { cwd: opts };
+  } else {
+    options = opts;
+  }
+
+  if (!options.cwd) {
+    throw new Error(
+      'Second argument (basePath) must be specified for names of resulting files'
+    );
+  }
+
+  if (!path.isAbsolute(options.cwd)) {
+    throw new Error(`basePath/cwd must be an absolute path (${options.cwd})`);
+  }
+
+  const results: FsFiles = {};
+
+  options.symlinks = {};
+  options.statCache = {};
+  options.stat = true;
+  options.dot = true;
+
+  const files = await vanillaGlob(pattern, options);
+
+  for (const relativePath of files) {
+    const fsPath = path.join(options.cwd!, relativePath).replace(/\\/g, '/');
+    let stat: Stats = options.statCache![fsPath] as Stats;
+    assert(
+      stat,
+      `statCache does not contain value for ${relativePath} (resolved to ${fsPath})`
+    );
+    if (stat.isFile()) {
+      const isSymlink = options.symlinks![fsPath];
+      if (isSymlink) {
+        stat = await lstat(fsPath);
+      }
+
+      let finalPath = relativePath;
+      if (mountpoint) {
+        finalPath = path.join(mountpoint, finalPath);
+      }
+
+      results[finalPath] = new FileFsRef({ mode: stat.mode, fsPath });
+    }
+  }
+
+  return results;
+}

packages/now-build-utils/src/fs/rename.ts

@@ -0,0 +1,12 @@
+import { Files } from '../types';
+type Delegate = (name: string) => string;
+
+export default function rename(files: Files, delegate: Delegate): Files {
+  return Object.keys(files).reduce(
+    (newFiles, name) => ({
+      ...newFiles,
+      [delegate(name)]: files[name],
+    }),
+    {}
+  );
+}

packages/now-build-utils/src/fs/run-user-scripts.ts

@@ -0,0 +1,154 @@
+import assert from 'assert';
+import fs from 'fs-extra';
+import path from 'path';
+import spawn from 'cross-spawn';
+import { SpawnOptions } from 'child_process';
+
+function spawnAsync(
+  command: string,
+  args: string[],
+  cwd: string,
+  opts: SpawnOptions = {}
+) {
+  return new Promise<void>((resolve, reject) => {
+    const stderrLogs: Buffer[] = [];
+    opts = { stdio: 'inherit', cwd, ...opts };
+    const child = spawn(command, args, opts);
+
+    if (opts.stdio === 'pipe') {
+      child.stderr.on('data', data => stderrLogs.push(data));
+    }
+
+    child.on('error', reject);
+    child.on('close', (code, signal) => {
+      if (code === 0) {
+        return resolve();
+      }
+
+      const errorLogs = stderrLogs.map(line => line.toString()).join('');
+      if (opts.stdio !== 'inherit') {
+        reject(new Error(`Exited with ${code || signal}\n${errorLogs}`));
+      } else {
+        reject(new Error(`Exited with ${code || signal}`));
+      }
+    });
+  });
+}
+
+async function chmodPlusX(fsPath: string) {
+  const s = await fs.stat(fsPath);
+  const newMode = s.mode | 64 | 8 | 1; // eslint-disable-line no-bitwise
+  if (s.mode === newMode) return;
+  const base8 = newMode.toString(8).slice(-3);
+  await fs.chmod(fsPath, base8);
+}
+
+export async function runShellScript(fsPath: string) {
+  assert(path.isAbsolute(fsPath));
+  const destPath = path.dirname(fsPath);
+  await chmodPlusX(fsPath);
+  await spawnAsync(`./${path.basename(fsPath)}`, [], destPath);
+  return true;
+}
+
+async function scanParentDirs(destPath: string, scriptName?: string) {
+  assert(path.isAbsolute(destPath));
+
+  let hasScript = false;
+  let hasPackageLockJson = false;
+  let currentDestPath = destPath;
+
+  // eslint-disable-next-line no-constant-condition
+  while (true) {
+    const packageJsonPath = path.join(currentDestPath, 'package.json');
+    // eslint-disable-next-line no-await-in-loop
+    if (await fs.pathExists(packageJsonPath)) {
+      // eslint-disable-next-line no-await-in-loop
+      const packageJson = JSON.parse(
+        await fs.readFile(packageJsonPath, 'utf8')
+      );
+      hasScript = Boolean(
+        packageJson.scripts && scriptName && packageJson.scripts[scriptName]
+      );
+      // eslint-disable-next-line no-await-in-loop
+      hasPackageLockJson = await fs.pathExists(
+        path.join(currentDestPath, 'package-lock.json')
+      );
+      break;
+    }
+
+    const newDestPath = path.dirname(currentDestPath);
+    if (currentDestPath === newDestPath) break;
+    currentDestPath = newDestPath;
+  }
+
+  return { hasScript, hasPackageLockJson };
+}
+
+export async function installDependencies(
+  destPath: string,
+  args: string[] = []
+) {
+  assert(path.isAbsolute(destPath));
+
+  let commandArgs = args;
+  console.log(`installing to ${destPath}`);
+  const { hasPackageLockJson } = await scanParentDirs(destPath);
+
+  const opts = {
+    env: {
+      ...process.env,
+      // This is a little hack to force `node-gyp` to build for the
+      // Node.js version that `@now/node` and `@now/node-server` use
+      npm_config_target: '8.10.0',
+    },
+    stdio: 'pipe',
+  };
+
+  if (hasPackageLockJson) {
+    commandArgs = args.filter(a => a !== '--prefer-offline');
+    await spawnAsync(
+      'npm',
+      ['install', '--unsafe-perm'].concat(commandArgs),
+      destPath,
+      opts as SpawnOptions
+    );
+  } else {
+    await spawnAsync(
+      'yarn',
+      ['--ignore-engines', '--cwd', destPath].concat(commandArgs),
+      destPath,
+      opts as SpawnOptions
+    );
+  }
+}
+
+export async function runPackageJsonScript(
+  destPath: string,
+  scriptName: string,
+  opts?: SpawnOptions
+) {
+  assert(path.isAbsolute(destPath));
+  const { hasScript, hasPackageLockJson } = await scanParentDirs(
+    destPath,
+    scriptName
+  );
+  if (!hasScript) return false;
+
+  if (hasPackageLockJson) {
+    console.log(`running "npm run ${scriptName}"`);
+    await spawnAsync('npm', ['run', scriptName], destPath, opts);
+  } else {
+    console.log(`running "yarn run ${scriptName}"`);
+    await spawnAsync(
+      'yarn',
+      ['--cwd', destPath, 'run', scriptName],
+      destPath,
+      opts
+    );
+  }
+
+  return true;
+}
+
+export const runNpmInstall = installDependencies;

packages/now-build-utils/src/fs/stream-to-buffer.ts

@@ -0,0 +1,28 @@
+import eos from 'end-of-stream';
+
+export default function streamToBuffer(
+  stream: NodeJS.ReadableStream
+): Promise<Buffer> {
+  return new Promise<Buffer>((resolve, reject) => {
+    const buffers: Buffer[] = [];
+
+    stream.on('data', buffers.push.bind(buffers));
+
+    eos(stream, err => {
+      if (err) {
+        reject(err);
+        return;
+      }
+      switch (buffers.length) {
+        case 0:
+          resolve(Buffer.allocUnsafe(0));
+          break;
+        case 1:
+          resolve(buffers[0]);
+          break;
+        default:
+          resolve(Buffer.concat(buffers));
+      }
+    });
+  });
+}

packages/now-build-utils/src/index.ts

@@ -0,0 +1,51 @@
+import FileBlob from './file-blob';
+import FileFsRef from './file-fs-ref';
+import FileRef from './file-ref';
+import {
+  File,
+  Files,
+  AnalyzeOptions,
+  BuildOptions,
+  PrepareCacheOptions,
+  ShouldServeOptions,
+  Meta,
+} from './types';
+import { Lambda, createLambda } from './lambda';
+import download, { DownloadedFiles } from './fs/download';
+import getWriteableDirectory from './fs/get-writable-directory';
+import glob from './fs/glob';
+import rename from './fs/rename';
+import {
+  installDependencies,
+  runPackageJsonScript,
+  runNpmInstall,
+  runShellScript,
+} from './fs/run-user-scripts';
+import streamToBuffer from './fs/stream-to-buffer';
+import shouldServe from './should-serve';
+
+export {
+  FileBlob,
+  FileFsRef,
+  FileRef,
+  Files,
+  File,
+  Meta,
+  Lambda,
+  createLambda,
+  download,
+  DownloadedFiles,
+  getWriteableDirectory,
+  glob,
+  rename,
+  installDependencies,
+  runPackageJsonScript,
+  runNpmInstall,
+  runShellScript,
+  streamToBuffer,
+  AnalyzeOptions,
+  BuildOptions,
+  PrepareCacheOptions,
+  ShouldServeOptions,
+  shouldServe,
+};

packages/now-build-utils/src/lambda.ts

@@ -0,0 +1,107 @@
+import assert from 'assert';
+import Sema from 'async-sema';
+import { ZipFile } from 'yazl';
+import { readlink } from 'fs-extra';
+import { Files } from './types';
+import FileFsRef from './file-fs-ref';
+import { isSymbolicLink } from './fs/download';
+import streamToBuffer from './fs/stream-to-buffer';
+
+interface Environment {
+  [key: string]: string;
+}
+
+interface LambdaOptions {
+  zipBuffer: Buffer;
+  handler: string;
+  runtime: string;
+  environment: Environment;
+}
+
+interface CreateLambdaOptions {
+  files: Files;
+  handler: string;
+  runtime: string;
+  environment?: Environment;
+}
+
+export class Lambda {
+  public type: 'Lambda';
+  public zipBuffer: Buffer;
+  public handler: string;
+  public runtime: string;
+  public environment: Environment;
+
+  constructor({ zipBuffer, handler, runtime, environment }: LambdaOptions) {
+    this.type = 'Lambda';
+    this.zipBuffer = zipBuffer;
+    this.handler = handler;
+    this.runtime = runtime;
+    this.environment = environment;
+  }
+}
+
+const sema = new Sema(10);
+const mtime = new Date(1540000000000);
+
+export async function createLambda({
+  files,
+  handler,
+  runtime,
+  environment = {},
+}: CreateLambdaOptions): Promise<Lambda> {
+  assert(typeof files === 'object', '"files" must be an object');
+  assert(typeof handler === 'string', '"handler" is not a string');
+  assert(typeof runtime === 'string', '"runtime" is not a string');
+  assert(typeof environment === 'object', '"environment" is not an object');
+
+  await sema.acquire();
+
+  try {
+    const zipBuffer = await createZip(files);
+    return new Lambda({
+      zipBuffer,
+      handler,
+      runtime,
+      environment,
+    });
+  } finally {
+    sema.release();
+  }
+}
+
+export async function createZip(files: Files): Promise<Buffer> {
+  const names = Object.keys(files).sort();
+
+  const symlinkTargets = new Map<string, string>();
+  for (const name of names) {
+    const file = files[name];
+    if (file.mode && isSymbolicLink(file.mode) && file.type === 'FileFsRef') {
+      const symlinkTarget = await readlink((file as FileFsRef).fsPath);
+      symlinkTargets.set(name, symlinkTarget);
+    }
+  }
+
+  const zipFile = new ZipFile();
+  const zipBuffer = await new Promise<Buffer>((resolve, reject) => {
+    for (const name of names) {
+      const file = files[name];
+      const opts = { mode: file.mode, mtime };
+      const symlinkTarget = symlinkTargets.get(name);
+      if (typeof symlinkTarget === 'string') {
+        zipFile.addBuffer(Buffer.from(symlinkTarget, 'utf8'), name, opts);
+      } else {
+        const stream = file.toStream() as import('stream').Readable;
+        stream.on('error', reject);
+        zipFile.addReadStream(stream, name, opts);
+      }
+    }
+
+    zipFile.end();
+    streamToBuffer(zipFile.outputStream)
+      .then(resolve)
+      .catch(reject);
+  });
+
+  return zipBuffer;
+}

packages/now-build-utils/src/should-serve.ts

@@ -0,0 +1,27 @@
+import { parse } from 'path';
+import { ShouldServeOptions } from './types';
+import FileFsRef from './file-fs-ref';
+
+export default function shouldServe({
+  entrypoint,
+  files,
+  requestPath,
+}: ShouldServeOptions): boolean {
+  requestPath = requestPath.replace(/\/$/, ''); // sanitize trailing '/'
+  entrypoint = entrypoint.replace(/\\/, '/'); // windows compatibility
+
+  if (entrypoint === requestPath && hasProp(files, entrypoint)) {
+    return true;
+  }
+
+  const { dir, name } = parse(entrypoint);
+  if (name === 'index' && dir === requestPath && hasProp(files, entrypoint)) {
+    return true;
+  }
+
+  return false;
+}
+
+function hasProp(obj: { [path: string]: FileFsRef }, key: string): boolean {
+  return Object.hasOwnProperty.call(obj, key);
+}

packages/now-build-utils/src/types.ts

@@ -0,0 +1,157 @@
+import FileRef from './file-ref';
+import FileFsRef from './file-fs-ref';
+
+export interface File {
+  type: string;
+  mode: number;
+  toStream: () => NodeJS.ReadableStream;
+  /**
+   * The absolute path to the file in the filesystem
+   */
+  fsPath?: string;
+}
+
+export interface Files {
+  [filePath: string]: File;
+}
+
+export interface Config {
+  [key: string]: string;
+}
+
+export interface Meta {
+  isDev?: boolean;
+  requestPath?: string;
+  filesChanged?: string[];
+  filesRemoved?: string[];
+}
+
+export interface AnalyzeOptions {
+  /**
+   * All source files of the project
+   */
+  files: {
+    [filePath: string]: FileRef;
+  };
+
+  /**
+   * Name of entrypoint file for this particular build job. Value
+   * `files[entrypoint]` is guaranteed to exist and be a valid File reference.
+   * `entrypoint` is always a discrete file and never a glob, since globs are
+   * expanded into separate builds at deployment time.
+   */
+  entrypoint: string;
+
+  /**
+   * A writable temporary directory where you are encouraged to perform your
+   * build process. This directory will be populated with the restored cache.
+   */
+  workPath: string;
+
+  /**
+   * An arbitrary object passed by the user in the build definition defined
+   * in `now.json`.
+   */
+  config: Config;
+}
+
+export interface BuildOptions {
+  /**
+   * All source files of the project
+   */
+  files: Files;
+
+  /**
+   * Name of entrypoint file for this particular build job. Value
+   * `files[entrypoint]` is guaranteed to exist and be a valid File reference.
+   * `entrypoint` is always a discrete file and never a glob, since globs are
+   * expanded into separate builds at deployment time.
+   */
+  entrypoint: string;
+
+  /**
+   * A writable temporary directory where you are encouraged to perform your
+   * build process. This directory will be populated with the restored cache.
+   */
+  workPath: string;
+
+  /**
+   * An arbitrary object passed by the user in the build definition defined
+   * in `now.json`.
+   */
+  config: Config;
+
+  /**
+   * Metadata related to the invoker of the builder, used by `now dev`.
+   * Builders may use the properties on this object to change behavior based
+   * on the build environment.
+   */
+  meta?: Meta;
+}
+
+export interface PrepareCacheOptions {
+  /**
+   * All source files of the project
+   */
+  files: Files;
+
+  /**
+   * Name of entrypoint file for this particular build job. Value
+   * `files[entrypoint]` is guaranteed to exist and be a valid File reference.
+   * `entrypoint` is always a discrete file and never a glob, since globs are
+   * expanded into separate builds at deployment time.
+   */
+  entrypoint: string;
+
+  /**
+   * A writable temporary directory where you are encouraged to perform your
+   * build process.
+   */
+  workPath: string;
+
+  /**
+   * A writable temporary directory where you can build a cache to use for
+   * the next run.
+   */
+  cachePath: string;
+
+  /**
+   * An arbitrary object passed by the user in the build definition defined
+   * in `now.json`.
+   */
+  config: Config;
+}
+
+export interface ShouldServeOptions {
+  /**
+   * A path string from a request.
+   */
+  requestPath: string;
+
+  /**
+   * Name of entrypoint file for this particular build job. Value
+   * `files[entrypoint]` is guaranteed to exist and be a valid File reference.
+   * `entrypoint` is always a discrete file and never a glob, since globs are
+   * expanded into separate builds at deployment time.
+   */
+  entrypoint: string;
+
+  /**
+   * All source files of the project
+   */
+  files: {
+    [path: string]: FileFsRef;
+  };
+
+  /**
+   * A writable temporary directory where you are encouraged to perform your
+   * build process. This directory will be populated with the restored cache.
+   */
+  workPath: string;
+
+  /**
+   * An arbitrary object passed by the user in the build definition defined
+   * in `now.json`.
+   */
+  config: Config;
+}

packages/now-build-utils/test/fixtures/07-cross-install/api/index.js

@@ -0,0 +1,5 @@
+const cowsay = require('cowsay').say;
+
+module.exports = (req, resp) => {
+  resp.end(cowsay({ text: 'cross-cow:RANDOMNESS_PLACEHOLDER' }));
+};

packages/now-build-utils/test/fixtures/07-cross-install/api/package.json

@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "lib": "../lib"
+  }
+}

packages/now-build-utils/test/fixtures/07-cross-install/lib/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "lib",
+  "version": "0.0.1",
+  "dependencies": {
+    "cowsay": "*"
+  }
+}

packages/now-build-utils/test/fixtures/07-cross-install/now.json

@@ -0,0 +1,10 @@
+{
+  "version": 2,
+  "builds": [{ "src": "api/index.js", "use": "@now/node" }],
+  "probes": [
+    {
+      "path": "/api/index.js",
+      "mustContain": "cross-cow:RANDOMNESS_PLACEHOLDER"
+    }
+  ]
+}

packages/now-build-utils/test/fixtures/08-yarn-npm/now.json

@@ -0,0 +1,11 @@
+{
+  "version": 2,
+  "builds": [
+    { "src": "with-npm/index.js", "use": "@now/node" },
+    { "src": "with-yarn/index.js", "use": "@now/node" }
+  ],
+  "probes": [
+    { "path": "/with-npm", "mustContain": "npm:RANDOMNESS_PLACEHOLDER" },
+    { "path": "/with-yarn", "mustContain": "yarn:RANDOMNESS_PLACEHOLDER" }
+  ]
+}

packages/now-build-utils/test/fixtures/08-yarn-npm/with-npm/must-be-npm.js

@@ -0,0 +1,14 @@
+const fs = require('fs');
+const path = require('path');
+
+const execpath = path.basename(process.env.npm_execpath);
+console.log('execpath', execpath);
+
+if (execpath === 'npm-cli.js') {
+  fs.writeFileSync(
+    'index.js',
+    'module.exports = (_, resp) => resp.end("npm:RANDOMNESS_PLACEHOLDER");',
+  );
+} else {
+  throw new Error('npm is expected');
+}

packages/now-build-utils/test/fixtures/08-yarn-npm/with-npm/package-lock.json

@@ -0,0 +1,3 @@
+{
+  "lockfileVersion": 1
+}

packages/now-build-utils/test/fixtures/08-yarn-npm/with-npm/package.json

@@ -0,0 +1,5 @@
+{
+  "scripts": {
+    "now-build": "node must-be-npm.js"
+  }
+}

packages/now-build-utils/test/fixtures/08-yarn-npm/with-yarn/must-be-yarn.js

@@ -0,0 +1,14 @@
+const fs = require('fs');
+const path = require('path');
+
+const execpath = path.basename(process.env.npm_execpath);
+console.log('execpath', execpath);
+
+if (execpath === 'yarn.js' || execpath === 'yarn') {
+  fs.writeFileSync(
+    'index.js',
+    'module.exports = (_, resp) => resp.end("yarn:RANDOMNESS_PLACEHOLDER");',
+  );
+} else {
+  throw new Error('yarn is expected');
+}

packages/now-build-utils/test/fixtures/08-yarn-npm/with-yarn/package.json

@@ -0,0 +1,5 @@
+{
+  "scripts": {
+    "now-build": "node must-be-yarn.js"
+  }
+}

packages/now-build-utils/test/fixtures/15-yarn-ignore-engines/index.js

@@ -0,0 +1,9 @@
+const scheduler = require('@google-cloud/scheduler');
+
+module.exports = (_, res) => {
+  if (scheduler) {
+    res.end('found:RANDOMNESS_PLACEHOLDER');
+  } else {
+    res.end('nope:RANDOMNESS_PLACEHOLDER');
+  }
+};

packages/now-build-utils/test/fixtures/15-yarn-ignore-engines/now.json

@@ -0,0 +1,11 @@
+{
+  "version": 2,
+  "builds": [
+    {
+      "src": "index.js",
+      "use": "@now/node",
+      "config": { "maxLambdaSize": "15mb" }
+    }
+  ],
+  "probes": [{ "path": "/", "mustContain": "found:RANDOMNESS_PLACEHOLDER" }]
+}

packages/now-build-utils/test/fixtures/15-yarn-ignore-engines/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "15-yarn-ignore-engines",
+  "version": "1.0.0",
+  "main": "index.js",
+  "dependencies": {
+    "@google-cloud/scheduler": "0.3.0"
+  }
+}

packages/now-build-utils/test/symlinks/a.txt

@@ -0,0 +1 @@
+contents

packages/now-build-utils/test/symlinks/link.txt

@@ -0,0 +1 @@
+./a.txt

packages/now-build-utils/test/test.js

@@ -0,0 +1,110 @@
+/* global beforeAll, expect, it, jest */
+const path = require('path');
+const fs = require('fs-extra');
+// eslint-disable-next-line import/no-extraneous-dependencies
+const execa = require('execa');
+const assert = require('assert');
+const { glob, download } = require('../');
+const { createZip } = require('../dist/lambda');
+
+const {
+  packAndDeploy,
+  testDeployment,
+} = require('../../../test/lib/deployment/test-deployment.js');
+
+jest.setTimeout(4 * 60 * 1000);
+const builderUrl = '@canary';
+let buildUtilsUrl;
+
+beforeAll(async () => {
+  const buildUtilsPath = path.resolve(__dirname, '..');
+  buildUtilsUrl = await packAndDeploy(buildUtilsPath);
+  console.log('buildUtilsUrl', buildUtilsUrl);
+});
+
+// unit tests
+
+it('should re-create symlinks properly', async () => {
+  const files = await glob('**', path.join(__dirname, 'symlinks'));
+  assert.equal(Object.keys(files).length, 2);
+
+  const outDir = path.join(__dirname, 'symlinks-out');
+  await fs.remove(outDir);
+
+  const files2 = await download(files, outDir);
+  assert.equal(Object.keys(files2).length, 2);
+
+  const [linkStat, aStat] = await Promise.all([
+    fs.lstat(path.join(outDir, 'link.txt')),
+    fs.lstat(path.join(outDir, 'a.txt')),
+  ]);
+  assert(linkStat.isSymbolicLink());
+  assert(aStat.isFile());
+});
+
+it('should create zip files with symlinks properly', async () => {
+  const files = await glob('**', path.join(__dirname, 'symlinks'));
+  assert.equal(Object.keys(files).length, 2);
+
+  const outFile = path.join(__dirname, 'symlinks.zip');
+  await fs.remove(outFile);
+
+  const outDir = path.join(__dirname, 'symlinks-out');
+  await fs.remove(outDir);
+  await fs.mkdirp(outDir);
+
+  await fs.writeFile(outFile, await createZip(files));
+  await execa('unzip', [outFile], { cwd: outDir });
+
+  const [linkStat, aStat] = await Promise.all([
+    fs.lstat(path.join(outDir, 'link.txt')),
+    fs.lstat(path.join(outDir, 'a.txt')),
+  ]);
+  assert(linkStat.isSymbolicLink());
+  assert(aStat.isFile());
+});
+
+// own fixtures
+
+const fixturesPath = path.resolve(__dirname, 'fixtures');
+
+// eslint-disable-next-line no-restricted-syntax
+for (const fixture of fs.readdirSync(fixturesPath)) {
+  // eslint-disable-next-line no-loop-func
+  it(`should build ${fixture}`, async () => {
+    await expect(
+      testDeployment(
+        { builderUrl, buildUtilsUrl },
+        path.join(fixturesPath, fixture),
+      ),
+    ).resolves.toBeDefined();
+  });
+}
+
+// few foreign tests
+
+const buildersToTestWith = ['now-node-server', 'now-static-build'];
+
+// eslint-disable-next-line no-restricted-syntax
+for (const builder of buildersToTestWith) {
+  const fixturesPath2 = path.resolve(
+    __dirname,
+    `../../${builder}/test/fixtures`,
+  );
+
+  // eslint-disable-next-line no-restricted-syntax
+  for (const fixture of fs.readdirSync(fixturesPath2)) {
+    // don't run all foreign fixtures, just some
+    if (['01-cowsay', '03-env-vars'].includes(fixture)) {
+      // eslint-disable-next-line no-loop-func
+      it(`should build ${builder}/${fixture}`, async () => {
+        await expect(
+          testDeployment(
+            { builderUrl, buildUtilsUrl },
+            path.join(fixturesPath2, fixture),
+          ),
+        ).resolves.toBeDefined();
+      });
+    }
+  }
+}

packages/now-build-utils/tsconfig.json

@@ -0,0 +1,20 @@
+{
+  "compilerOptions": {
+    "declaration": true,
+    "esModuleInterop": true,
+    "lib": ["esnext"],
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "noEmitOnError": true,
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitReturns": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "outDir": "./dist",
+    "types": ["node"],
+    "strict": true,
+    "target": "esnext"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules"]
+}

packages/now-cgi/.editorconfig

@@ -0,0 +1,32 @@
+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+tab_width = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{*.json,*.json.example,*.gyp,*.yml}]
+indent_style = space
+indent_size = 2
+
+[*.py]
+indent_style = space
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false
+
+# Ideal settings - some plugins might support these.
+[*.js]
+quote_type = single
+
+[{*.c,*.cc,*.h,*.hh,*.cpp,*.hpp,*.m,*.mm,*.mpp,*.js,*.java,*.go,*.rs,*.php,*.ng,*.jsx,*.ts,*.d,*.cs,*.swift}]
+curly_bracket_next_line = false
+spaces_around_operators = true
+spaces_around_brackets = outside
+# close enough to 1TB
+indent_brace_style = K&R

packages/now-cgi/.gitignore

@@ -0,0 +1,2 @@
+node_modules
+handler

packages/now-cgi/build.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+export GOOS=linux
+export GOARCH=amd64
+export GOPATH=$HOME/go
+go get github.com/aws/aws-lambda-go/events
+go get github.com/aws/aws-lambda-go/lambda
+go build -o handler main.go

packages/now-cgi/index.js

@@ -0,0 +1,46 @@
+const path = require('path');
+const { mkdirp, copyFile } = require('fs-extra');
+
+const glob = require('@now/build-utils/fs/glob'); // eslint-disable-line import/no-extraneous-dependencies
+const download = require('@now/build-utils/fs/download'); // eslint-disable-line import/no-extraneous-dependencies
+const { createLambda } = require('@now/build-utils/lambda'); // eslint-disable-line import/no-extraneous-dependencies
+const getWritableDirectory = require('@now/build-utils/fs/get-writable-directory'); // eslint-disable-line import/no-extraneous-dependencies
+const { shouldServe } = require('@now/build-utils'); // eslint-disable-line import/no-extraneous-dependencies
+
+exports.analyze = ({ files, entrypoint }) => files[entrypoint].digest;
+
+exports.build = async ({
+  workPath, files, entrypoint, meta,
+}) => {
+  console.log('downloading files...');
+  const outDir = await getWritableDirectory();
+
+  await download(files, workPath, meta);
+
+  const handlerPath = path.join(__dirname, 'handler');
+  await copyFile(handlerPath, path.join(outDir, 'handler'));
+
+  const entrypointOutDir = path.join(outDir, path.dirname(entrypoint));
+  await mkdirp(entrypointOutDir);
+
+  // For now only the entrypoint file is copied into the lambda
+  await copyFile(
+    path.join(workPath, entrypoint),
+    path.join(outDir, entrypoint),
+  );
+
+  const lambda = await createLambda({
+    files: await glob('**', outDir),
+    handler: 'handler',
+    runtime: 'go1.x',
+    environment: {
+      SCRIPT_FILENAME: entrypoint,
+    },
+  });
+
+  return {
+    [entrypoint]: lambda,
+  };
+};
+
+exports.shouldServe = shouldServe;

packages/now-cgi/main.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	now "../../utils/go/bridge"
+	"net/http"
+	"net/http/cgi"
+	"os"
+	"path/filepath"
+)
+
+type CgiHandler struct {
+	http.Handler
+	Dir    string
+	Script string
+}
+
+func (h *CgiHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	handler := cgi.Handler{
+		Path: h.Script,
+		Root: "/" + h.Script,
+		Dir:  h.Dir,
+		Env: []string{
+			"HTTPS=on",
+			"SERVER_PORT=443",
+			"SERVER_SOFTWARE=@now/cgi",
+		},
+	}
+	handler.ServeHTTP(w, r)
+}
+
+func main() {
+	workdir, _ := filepath.Abs(".")
+	script := os.Getenv("SCRIPT_FILENAME")
+	handler := &CgiHandler{nil, workdir, script}
+	now.Start(handler)
+}

packages/now-cgi/package.json

@@ -0,0 +1,25 @@
+{
+  "name": "@now/cgi",
+  "version": "0.1.4",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/zeit/now-builders.git",
+    "directory": "packages/now-cgi"
+  },
+  "scripts": {
+    "test": "best -I test/*.js",
+    "prepublish": "./build.sh"
+  },
+  "files": [
+    "index.js",
+    "handler"
+  ],
+  "dependencies": {
+    "fs-extra": "7.0.0"
+  },
+  "devDependencies": {
+    "@zeit/best": "0.4.3",
+    "rmfr": "2.0.0"
+  }
+}

packages/now-cgi/yarn.lock

@@ -10,8 +10,8 @@
     glob-to-regexp "^0.3.0"
 
 "@nodelib/fs.stat@^1.0.1":
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-1.1.2.tgz#54c5a964462be3d4d78af631363c18d6fa91ac26"
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-1.1.3.tgz#2b5a3ab3f918cca48a8c754c08168e3f03eba61b"
 
 "@zeit/best@0.4.3":
   version "0.4.3"
@@ -23,14 +23,6 @@
     globby "8.0.0"
     signal-exit "3.0.2"
 
-ansi-regex@^2.0.0:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-2.1.1.tgz#c3b33ab5ee360d86e0e628f0468ae7ef27d654df"
-
-ansi-regex@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-3.0.0.tgz#ed0317c322064f79466c02966bddb605ab37d998"
-
 ansi-styles@^3.2.0:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
@@ -110,13 +102,6 @@ base@^0.11.1:
     mixin-deep "^1.2.0"
     pascalcase "^0.1.1"
 
-bl@^1.0.0:
-  version "1.2.2"
-  resolved "http://registry.npmjs.org/bl/-/bl-1.2.2.tgz#a160911717103c07410cef63ef51b397c025af9c"
-  dependencies:
-    readable-stream "^2.3.5"
-    safe-buffer "^5.1.1"
-
 brace-expansion@^1.1.7:
   version "1.1.11"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
@@ -139,21 +124,6 @@ braces@^2.3.1:
     split-string "^3.0.2"
     to-regex "^3.0.1"
 
-buffer-alloc-unsafe@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/buffer-alloc-unsafe/-/buffer-alloc-unsafe-1.1.0.tgz#bd7dc26ae2972d0eda253be061dba992349c19f0"
-
-buffer-alloc@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/buffer-alloc/-/buffer-alloc-1.2.0.tgz#890dd90d923a873e08e10e5fd51a57e5b7cce0ec"
-  dependencies:
-    buffer-alloc-unsafe "^1.1.0"
-    buffer-fill "^1.0.0"
-
-buffer-fill@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/buffer-fill/-/buffer-fill-1.0.0.tgz#f8f78b76789888ef39f205cd637f68e702122b2c"
-
 cache-base@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/cache-base/-/cache-base-1.0.1.tgz#0a7f46416831c8b662ee36fe4e7c59d76f666ab2"
@@ -172,10 +142,6 @@ call-me-maybe@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/call-me-maybe/-/call-me-maybe-1.0.1.tgz#26d208ea89e37b5cbde60250a15f031c16a4d66b"
 
-camelcase@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-4.1.0.tgz#d545635be1e33c542649c69173e5de6acfae34dd"
-
 chalk@2.3.1:
   version "2.3.1"
   resolved "http://registry.npmjs.org/chalk/-/chalk-2.3.1.tgz#523fe2678aec7b04e8041909292fe8b17059b796"
@@ -184,10 +150,6 @@ chalk@2.3.1:
     escape-string-regexp "^1.0.5"
     supports-color "^5.2.0"
 
-chownr@^1.0.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/chownr/-/chownr-1.1.1.tgz#54726b8b8fff4df053c42187e801fb4412df1494"
-
 class-utils@^0.3.5:
   version "0.3.6"
   resolved "https://registry.yarnpkg.com/class-utils/-/class-utils-0.3.6.tgz#f93369ae8b9a7ce02fd41faad0ca83033190c463"
@@ -197,18 +159,6 @@ class-utils@^0.3.5:
     isobject "^3.0.0"
     static-extend "^0.1.1"
 
-cliui@^4.0.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/cliui/-/cliui-4.1.0.tgz#348422dbe82d800b3022eef4f6ac10bf2e4d1b49"
-  dependencies:
-    string-width "^2.1.1"
-    strip-ansi "^4.0.0"
-    wrap-ansi "^2.0.0"
-
-code-point-at@^1.0.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/code-point-at/-/code-point-at-1.1.0.tgz#0d070b4d043a5bea33a2f1a40e2edb3d9a4ccf77"
-
 collection-visit@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/collection-visit/-/collection-visit-1.0.0.tgz#4bc0373c164bc3291b4d368c829cf1a80a59dca0"
@@ -238,32 +188,12 @@ copy-descriptor@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/copy-descriptor/-/copy-descriptor-0.1.1.tgz#676f6eb3c39997c2ee1ac3a924fd6124748f578d"
 
-core-util-is@~1.0.0:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
-
-cross-spawn@^6.0.0:
-  version "6.0.5"
-  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-6.0.5.tgz#4a5ec7c64dfae22c3a14124dbacdee846d80cbc4"
-  dependencies:
-    nice-try "^1.0.4"
-    path-key "^2.0.1"
-    semver "^5.5.0"
-    shebang-command "^1.2.0"
-    which "^1.2.9"
-
 debug@^2.2.0, debug@^2.3.3:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
   dependencies:
     ms "2.0.0"
 
-decamelize@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-2.0.0.tgz#656d7bbc8094c4c788ea53c5840908c9c7d063c7"
-  dependencies:
-    xregexp "4.0.0"
-
 decode-uri-component@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/decode-uri-component/-/decode-uri-component-0.2.0.tgz#eb3913333458775cb84cd1a1fae062106bb87545"
@@ -298,40 +228,10 @@ dir-glob@^2.0.0:
     arrify "^1.0.1"
     path-type "^3.0.0"
 
-end-of-stream@^1.0.0, end-of-stream@^1.1.0:
-  version "1.4.1"
-  resolved "https://registry.yarnpkg.com/end-of-stream/-/end-of-stream-1.4.1.tgz#ed29634d19baba463b6ce6b80a37213eab71ec43"
-  dependencies:
-    once "^1.4.0"
-
 escape-string-regexp@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
 
-execa@^0.10.0:
-  version "0.10.0"
-  resolved "https://registry.yarnpkg.com/execa/-/execa-0.10.0.tgz#ff456a8f53f90f8eccc71a96d11bdfc7f082cb50"
-  dependencies:
-    cross-spawn "^6.0.0"
-    get-stream "^3.0.0"
-    is-stream "^1.1.0"
-    npm-run-path "^2.0.0"
-    p-finally "^1.0.0"
-    signal-exit "^3.0.0"
-    strip-eof "^1.0.0"
-
-execa@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/execa/-/execa-1.0.0.tgz#c6236a5bb4df6d6f15e88e7f017798216749ddd8"
-  dependencies:
-    cross-spawn "^6.0.0"
-    get-stream "^4.0.0"
-    is-stream "^1.1.0"
-    npm-run-path "^2.0.0"
-    p-finally "^1.0.0"
-    signal-exit "^3.0.0"
-    strip-eof "^1.0.0"
-
 expand-brackets@^2.1.4:
   version "2.1.4"
   resolved "https://registry.yarnpkg.com/expand-brackets/-/expand-brackets-2.1.4.tgz#b77735e315ce30f6b6eff0f83b04151a22449622"
@@ -390,12 +290,6 @@ fill-range@^4.0.0:
     repeat-string "^1.6.1"
     to-regex-range "^2.1.0"
 
-find-up@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/find-up/-/find-up-3.0.0.tgz#49169f1d7993430646da61ecc5ae355c21c97b73"
-  dependencies:
-    locate-path "^3.0.0"
-
 for-in@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/for-in/-/for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"
@@ -406,11 +300,7 @@ fragment-cache@^0.2.1:
   dependencies:
     map-cache "^0.2.2"
 
-fs-constants@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/fs-constants/-/fs-constants-1.0.0.tgz#6be0de9be998ce16af8afc24497b9ee9b7ccd9ad"
-
-fs-extra@^7.0.0:
+fs-extra@7.0.0:
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-7.0.0.tgz#8cc3f47ce07ef7b3593a11b9fb245f7e34c041d6"
   dependencies:
@@ -418,30 +308,10 @@ fs-extra@^7.0.0:
     jsonfile "^4.0.0"
     universalify "^0.1.0"
 
-fs-minipass@^1.2.5:
-  version "1.2.5"
-  resolved "https://registry.yarnpkg.com/fs-minipass/-/fs-minipass-1.2.5.tgz#06c277218454ec288df77ada54a03b8702aacb9d"
-  dependencies:
-    minipass "^2.2.1"
-
 fs.realpath@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
 
-get-caller-file@^1.0.1:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-1.0.3.tgz#f978fa4c90d1dfe7ff2d6beda2a515e713bdcf4a"
-
-get-stream@^3.0.0:
-  version "3.0.0"
-  resolved "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz#8e943d1358dc37555054ecbe2edb05aa174ede14"
-
-get-stream@^4.0.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-4.1.0.tgz#c1b255575f3dc21d59bfc79cd3d2b46b1c3a54b5"
-  dependencies:
-    pump "^3.0.0"
-
 get-value@^2.0.3, get-value@^2.0.6:
   version "2.0.6"
   resolved "https://registry.yarnpkg.com/get-value/-/get-value-2.0.6.tgz#dc15ca1c672387ca76bd37ac0a395ba2042a2c28"
@@ -485,8 +355,8 @@ globby@8.0.0:
     slash "^1.0.0"
 
 graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.1.6:
-  version "4.1.11"
-  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
+  version "4.1.14"
+  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.14.tgz#1b6e8362ef8c5ecb5da799901f39297e3054773a"
 
 has-flag@^3.0.0:
   version "3.0.0"
@@ -536,7 +406,7 @@ inflight@^1.0.4:
     once "^1.3.0"
     wrappy "1"
 
-inherits@2, inherits@~2.0.3:
+inherits@2:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
 
@@ -546,10 +416,6 @@ inspect-with-kind@^1.0.4:
   dependencies:
     kind-of "^6.0.2"
 
-invert-kv@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/invert-kv/-/invert-kv-2.0.0.tgz#7393f5afa59ec9ff5f67a27620d11c226e3eec02"
-
 is-accessor-descriptor@^0.1.6:
   version "0.1.6"
   resolved "https://registry.yarnpkg.com/is-accessor-descriptor/-/is-accessor-descriptor-0.1.6.tgz#a9e12cb3ae8d876727eeef3843f8a0897b5c98d6"
@@ -608,16 +474,6 @@ is-extglob@^2.1.0, is-extglob@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/is-extglob/-/is-extglob-2.1.1.tgz#a88c02535791f02ed37c76a1b9ea9773c833f8c2"
 
-is-fullwidth-code-point@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz#ef9e31386f031a7f0d643af82fde50c457ef00cb"
-  dependencies:
-    number-is-nan "^1.0.0"
-
-is-fullwidth-code-point@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz#a3b30a5c4f199183167aaab93beefae3ddfb654f"
-
 is-glob@^3.1.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/is-glob/-/is-glob-3.1.0.tgz#7ba5ae24217804ac70707b96922567486cc3e84a"
@@ -646,22 +502,14 @@ is-plain-object@^2.0.1, is-plain-object@^2.0.3, is-plain-object@^2.0.4:
   dependencies:
     isobject "^3.0.1"
 
-is-stream@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
-
 is-windows@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.2.tgz#d1850eb9791ecd18e6182ce12a30f396634bb19d"
 
-isarray@1.0.0, isarray@~1.0.0:
+isarray@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
 
-isexe@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/isexe/-/isexe-2.0.0.tgz#e8fbf374dc556ff8947a10dcb0572d633f2cfa10"
-
 isobject@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/isobject/-/isobject-2.1.0.tgz#f065561096a3f1da2ef46272f815c840d87e0c89"
@@ -672,13 +520,6 @@ isobject@^3.0.0, isobject@^3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/isobject/-/isobject-3.0.1.tgz#4e431e92b11a9731636aa1f9c8d1ccbcfdab78df"
 
-isomorphic-unfetch@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/isomorphic-unfetch/-/isomorphic-unfetch-3.0.0.tgz#de6d80abde487b17de2c400a7ef9e5ecc2efb362"
-  dependencies:
-    node-fetch "^2.2.0"
-    unfetch "^4.0.0"
-
 jsonfile@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/jsonfile/-/jsonfile-4.0.0.tgz#8771aae0799b64076b76640fca058f9c10e33ecb"
@@ -705,31 +546,6 @@ kind-of@^6.0.0, kind-of@^6.0.2:
   version "6.0.2"
   resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-6.0.2.tgz#01146b36a6218e64e58f3a8d66de5d7fc6f6d051"
 
-lambda-git@^0.1.2:
-  version "0.1.2"
-  resolved "https://registry.yarnpkg.com/lambda-git/-/lambda-git-0.1.2.tgz#32ee82a47d7fc4e9c05ab03ae22b5572d8e642e4"
-  dependencies:
-    tar-fs "^1.14.0"
-
-lcid@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/lcid/-/lcid-2.0.0.tgz#6ef5d2df60e52f82eb228a4c373e8d1f397253cf"
-  dependencies:
-    invert-kv "^2.0.0"
-
-locate-path@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-3.0.0.tgz#dbec3b3ab759758071b58fe59fc41871af21400e"
-  dependencies:
-    p-locate "^3.0.0"
-    path-exists "^3.0.0"
-
-map-age-cleaner@^0.1.1:
-  version "0.1.2"
-  resolved "https://registry.yarnpkg.com/map-age-cleaner/-/map-age-cleaner-0.1.2.tgz#098fb15538fd3dbe461f12745b0ca8568d4e3f74"
-  dependencies:
-    p-defer "^1.0.0"
-
 map-cache@^0.2.2:
   version "0.2.2"
   resolved "https://registry.yarnpkg.com/map-cache/-/map-cache-0.2.2.tgz#c32abd0bd6525d9b051645bb4f26ac5dc98a0dbf"
@@ -740,14 +556,6 @@ map-visit@^1.0.0:
   dependencies:
     object-visit "^1.0.0"
 
-mem@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/mem/-/mem-4.0.0.tgz#6437690d9471678f6cc83659c00cbafcd6b0cdaf"
-  dependencies:
-    map-age-cleaner "^0.1.1"
-    mimic-fn "^1.0.0"
-    p-is-promise "^1.1.0"
-
 merge2@^1.2.1:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/merge2/-/merge2-1.2.3.tgz#7ee99dbd69bb6481689253f018488a1b902b0ed5"
@@ -770,33 +578,12 @@ micromatch@^3.1.10:
     snapdragon "^0.8.1"
     to-regex "^3.0.2"
 
-mimic-fn@^1.0.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-1.2.0.tgz#820c86a39334640e99516928bd03fca88057d022"
-
 minimatch@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
   dependencies:
     brace-expansion "^1.1.7"
 
-minimist@0.0.8:
-  version "0.0.8"
-  resolved "http://registry.npmjs.org/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
-
-minipass@^2.2.1, minipass@^2.3.3:
-  version "2.3.4"
-  resolved "https://registry.yarnpkg.com/minipass/-/minipass-2.3.4.tgz#4768d7605ed6194d6d576169b9e12ef71e9d9957"
-  dependencies:
-    safe-buffer "^5.1.2"
-    yallist "^3.0.0"
-
-minizlib@^1.1.0:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/minizlib/-/minizlib-1.1.1.tgz#6734acc045a46e61d596a43bb9d9cd326e19cc42"
-  dependencies:
-    minipass "^2.2.1"
-
 mixin-deep@^1.2.0:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/mixin-deep/-/mixin-deep-1.3.1.tgz#a49e7268dce1a0d9698e45326c5626df3543d0fe"
@@ -804,18 +591,6 @@ mixin-deep@^1.2.0:
     for-in "^1.0.2"
     is-extendable "^1.0.1"
 
-mkdirp-promise@5.0.1:
-  version "5.0.1"
-  resolved "https://registry.yarnpkg.com/mkdirp-promise/-/mkdirp-promise-5.0.1.tgz#e9b8f68e552c68a9c1713b84883f7a1dd039b8a1"
-  dependencies:
-    mkdirp "*"
-
-mkdirp@*, mkdirp@^0.5.0, mkdirp@^0.5.1:
-  version "0.5.1"
-  resolved "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
-  dependencies:
-    minimist "0.0.8"
-
 ms@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
@@ -836,38 +611,6 @@ nanomatch@^1.2.9:
     snapdragon "^0.8.1"
     to-regex "^3.0.1"
 
-nice-try@^1.0.4:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.5.tgz#a3378a7696ce7d223e88fc9b764bd7ef1089e366"
-
-node-fetch@^2.2.0:
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.2.0.tgz#4ee79bde909262f9775f731e3656d0db55ced5b5"
-
-now-fetch@0.1.1:
-  version "0.1.1"
-  resolved "https://registry.yarnpkg.com/now-fetch/-/now-fetch-0.1.1.tgz#f886974284281c9f2853ed326dbb8b152f47abce"
-  dependencies:
-    isomorphic-unfetch "^3.0.0"
-    now-token "^0.1.4"
-
-now-token@^0.1.4:
-  version "0.1.5"
-  resolved "https://registry.yarnpkg.com/now-token/-/now-token-0.1.5.tgz#76e2b92e29035a744f70d6cab46c45befb935e16"
-  dependencies:
-    fs-extra "^7.0.0"
-    yargs "^12.0.2"
-
-npm-run-path@^2.0.0:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/npm-run-path/-/npm-run-path-2.0.2.tgz#35a9232dfa35d7067b4cb2ddf2357b1871536c5f"
-  dependencies:
-    path-key "^2.0.0"
-
-number-is-nan@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/number-is-nan/-/number-is-nan-1.0.1.tgz#097b602b53422a522c1afb8790318336941a011d"
-
 object-copy@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/object-copy/-/object-copy-0.1.0.tgz#7e7d858b781bd7c991a41ba975ed3812754e998c"
@@ -888,48 +631,12 @@ object.pick@^1.3.0:
   dependencies:
     isobject "^3.0.1"
 
-once@^1.3.0, once@^1.3.1, once@^1.4.0:
+once@^1.3.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
   dependencies:
     wrappy "1"
 
-os-locale@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/os-locale/-/os-locale-3.0.1.tgz#3b014fbf01d87f60a1e5348d80fe870dc82c4620"
-  dependencies:
-    execa "^0.10.0"
-    lcid "^2.0.0"
-    mem "^4.0.0"
-
-p-defer@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/p-defer/-/p-defer-1.0.0.tgz#9f6eb182f6c9aa8cd743004a7d4f96b196b0fb0c"
-
-p-finally@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/p-finally/-/p-finally-1.0.0.tgz#3fbcfb15b899a44123b34b6dcc18b724336a2cae"
-
-p-is-promise@^1.1.0:
-  version "1.1.0"
-  resolved "http://registry.npmjs.org/p-is-promise/-/p-is-promise-1.1.0.tgz#9c9456989e9f6588017b0434d56097675c3da05e"
-
-p-limit@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-2.0.0.tgz#e624ed54ee8c460a778b3c9f3670496ff8a57aec"
-  dependencies:
-    p-try "^2.0.0"
-
-p-locate@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-3.0.0.tgz#322d69a05c0264b25997d9f40cd8a891ab0064a4"
-  dependencies:
-    p-limit "^2.0.0"
-
-p-try@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/p-try/-/p-try-2.0.0.tgz#85080bb87c64688fa47996fe8f7dfbe8211760b1"
-
 pascalcase@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/pascalcase/-/pascalcase-0.1.1.tgz#b363e55e8006ca6fe21784d2db22bd15d7917f14"
@@ -938,18 +645,10 @@ path-dirname@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/path-dirname/-/path-dirname-1.0.2.tgz#cc33d24d525e099a5388c0336c6e32b9160609e0"
 
-path-exists@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/path-exists/-/path-exists-3.0.0.tgz#ce0ebeaa5f78cb18925ea7d810d7b59b010fd515"
-
 path-is-absolute@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/path-is-absolute/-/path-is-absolute-1.0.1.tgz#174b9268735534ffbc7ace6bf53a5a9e1b5c5f5f"
 
-path-key@^2.0.0, path-key@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/path-key/-/path-key-2.0.1.tgz#411cadb574c5a140d3a4b1910d40d80cc9f40b40"
-
 path-type@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/path-type/-/path-type-3.0.0.tgz#cef31dc8e0a1a3bb0d105c0cd97cf3bf47f4e36f"
@@ -964,36 +663,6 @@ posix-character-classes@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/posix-character-classes/-/posix-character-classes-0.1.1.tgz#01eac0fe3b5af71a2a6c02feabb8c1fef7e00eab"
 
-process-nextick-args@~2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-2.0.0.tgz#a37d732f4271b4ab1ad070d35508e8290788ffaa"
-
-pump@^1.0.0:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/pump/-/pump-1.0.3.tgz#5dfe8311c33bbf6fc18261f9f34702c47c08a954"
-  dependencies:
-    end-of-stream "^1.1.0"
-    once "^1.3.1"
-
-pump@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/pump/-/pump-3.0.0.tgz#b4a2116815bde2f4e1ea602354e8c75565107a64"
-  dependencies:
-    end-of-stream "^1.1.0"
-    once "^1.3.1"
-
-readable-stream@^2.3.0, readable-stream@^2.3.5:
-  version "2.3.6"
-  resolved "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz#b11c27d88b8ff1fbe070643cf94b0c79ae1b0aaf"
-  dependencies:
-    core-util-is "~1.0.0"
-    inherits "~2.0.3"
-    isarray "~1.0.0"
-    process-nextick-args "~2.0.0"
-    safe-buffer "~5.1.1"
-    string_decoder "~1.1.1"
-    util-deprecate "~1.0.1"
-
 regex-not@^1.0.0, regex-not@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/regex-not/-/regex-not-1.0.2.tgz#1f4ece27e00b0b65e0247a6810e6a85d83a5752c"
@@ -1009,14 +678,6 @@ repeat-string@^1.6.1:
   version "1.6.1"
   resolved "https://registry.yarnpkg.com/repeat-string/-/repeat-string-1.6.1.tgz#8dcae470e1c88abc2d600fff4a776286da75e637"
 
-require-directory@^2.1.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/require-directory/-/require-directory-2.1.1.tgz#8c64ad5fd30dab1c976e2344ffe7f792a6a6df42"
-
-require-main-filename@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/require-main-filename/-/require-main-filename-1.0.1.tgz#97f717b69d48784f5f526a6c5aa8ffdda055a4d1"
-
 resolve-url@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/resolve-url/-/resolve-url-0.2.1.tgz#2c637fe77c893afd2a663fe21aa9080068e2052a"
@@ -1041,24 +702,12 @@ rmfr@2.0.0:
     inspect-with-kind "^1.0.4"
     rimraf "^2.6.2"
 
-safe-buffer@^5.1.1, safe-buffer@^5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
-  version "5.1.2"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
-
 safe-regex@^1.1.0:
   version "1.1.0"
-  resolved "https://registry.yarnpkg.com/safe-regex/-/safe-regex-1.1.0.tgz#40a3669f3b077d1e943d44629e157dd48023bf2e"
+  resolved "http://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz#40a3669f3b077d1e943d44629e157dd48023bf2e"
   dependencies:
     ret "~0.1.10"
 
-semver@^5.5.0:
-  version "5.6.0"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-5.6.0.tgz#7e74256fbaa49c75aa7c7a205cc22799cac80004"
-
-set-blocking@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"
-
 set-value@^0.4.3:
   version "0.4.3"
   resolved "https://registry.yarnpkg.com/set-value/-/set-value-0.4.3.tgz#7db08f9d3d22dc7f78e53af3c3bf4666ecdfccf1"
@@ -1077,17 +726,7 @@ set-value@^2.0.0:
     is-plain-object "^2.0.3"
     split-string "^3.0.1"
 
-shebang-command@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/shebang-command/-/shebang-command-1.2.0.tgz#44aac65b695b03398968c39f363fee5deafdf1ea"
-  dependencies:
-    shebang-regex "^1.0.0"
-
-shebang-regex@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-1.0.0.tgz#da42f49740c0b42db2ca9728571cb190c98efea3"
-
-signal-exit@3.0.2, signal-exit@^3.0.0:
+signal-exit@3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
 
@@ -1153,86 +792,12 @@ static-extend@^0.1.1:
     define-property "^0.2.5"
     object-copy "^0.1.0"
 
-string-width@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/string-width/-/string-width-1.0.2.tgz#118bdf5b8cdc51a2a7e70d211e07e2b0b9b107d3"
-  dependencies:
-    code-point-at "^1.0.0"
-    is-fullwidth-code-point "^1.0.0"
-    strip-ansi "^3.0.0"
-
-string-width@^2.0.0, string-width@^2.1.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/string-width/-/string-width-2.1.1.tgz#ab93f27a8dc13d28cac815c462143a6d9012ae9e"
-  dependencies:
-    is-fullwidth-code-point "^2.0.0"
-    strip-ansi "^4.0.0"
-
-string_decoder@~1.1.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/string_decoder/-/string_decoder-1.1.1.tgz#9cf1611ba62685d7030ae9e4ba34149c3af03fc8"
-  dependencies:
-    safe-buffer "~5.1.0"
-
-strip-ansi@^3.0.0, strip-ansi@^3.0.1:
-  version "3.0.1"
-  resolved "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz#6a385fb8853d952d5ff05d0e8aaf94278dc63dcf"
-  dependencies:
-    ansi-regex "^2.0.0"
-
-strip-ansi@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-4.0.0.tgz#a8479022eb1ac368a871389b635262c505ee368f"
-  dependencies:
-    ansi-regex "^3.0.0"
-
-strip-eof@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/strip-eof/-/strip-eof-1.0.0.tgz#bb43ff5598a6eb05d89b59fcd129c983313606bf"
-
 supports-color@^5.2.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.5.0.tgz#e2e69a44ac8772f78a1ec0b35b689df6530efc8f"
   dependencies:
     has-flag "^3.0.0"
 
-tar-fs@^1.14.0:
-  version "1.16.3"
-  resolved "https://registry.yarnpkg.com/tar-fs/-/tar-fs-1.16.3.tgz#966a628841da2c4010406a82167cbd5e0c72d509"
-  dependencies:
-    chownr "^1.0.1"
-    mkdirp "^0.5.1"
-    pump "^1.0.0"
-    tar-stream "^1.1.2"
-
-tar-stream@^1.1.2:
-  version "1.6.2"
-  resolved "https://registry.yarnpkg.com/tar-stream/-/tar-stream-1.6.2.tgz#8ea55dab37972253d9a9af90fdcd559ae435c555"
-  dependencies:
-    bl "^1.0.0"
-    buffer-alloc "^1.2.0"
-    end-of-stream "^1.0.0"
-    fs-constants "^1.0.0"
-    readable-stream "^2.3.0"
-    to-buffer "^1.1.1"
-    xtend "^4.0.0"
-
-tar@4.4.6:
-  version "4.4.6"
-  resolved "https://registry.yarnpkg.com/tar/-/tar-4.4.6.tgz#63110f09c00b4e60ac8bcfe1bf3c8660235fbc9b"
-  dependencies:
-    chownr "^1.0.1"
-    fs-minipass "^1.2.5"
-    minipass "^2.3.3"
-    minizlib "^1.1.0"
-    mkdirp "^0.5.0"
-    safe-buffer "^5.1.2"
-    yallist "^3.0.2"
-
-to-buffer@^1.1.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/to-buffer/-/to-buffer-1.1.1.tgz#493bd48f62d7c43fcded313a03dcadb2e1213a80"
-
 to-object-path@^0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/to-object-path/-/to-object-path-0.3.0.tgz#297588b7b0e7e0ac08e04e672f85c1f4999e17af"
@@ -1255,10 +820,6 @@ to-regex@^3.0.1, to-regex@^3.0.2:
     regex-not "^1.0.2"
     safe-regex "^1.1.0"
 
-unfetch@^4.0.0:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/unfetch/-/unfetch-4.0.1.tgz#8750c4c7497ade75d40387d7dbc4ba024416b8f6"
-
 union-value@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/union-value/-/union-value-1.0.0.tgz#5c71c34cb5bad5dcebe3ea0cd08207ba5aa1aea4"
@@ -1287,10 +848,6 @@ use@^3.1.0:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/use/-/use-3.1.1.tgz#d50c8cac79a19fbc20f2911f56eb973f4e10070f"
 
-util-deprecate@~1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
-
 validate-glob-opts@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/validate-glob-opts/-/validate-glob-opts-1.0.2.tgz#ef9f98977d965537ea4f51fa7d5799e9c6ebca91"
@@ -1300,62 +857,6 @@ validate-glob-opts@^1.0.0:
     inspect-with-kind "^1.0.4"
     is-plain-obj "^1.1.0"
 
-which-module@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/which-module/-/which-module-2.0.0.tgz#d9ef07dce77b9902b8a3a8fa4b31c3e3f7e6e87a"
-
-which@^1.2.9:
-  version "1.3.1"
-  resolved "https://registry.yarnpkg.com/which/-/which-1.3.1.tgz#a45043d54f5805316da8d62f9f50918d3da70b0a"
-  dependencies:
-    isexe "^2.0.0"
-
-wrap-ansi@^2.0.0:
-  version "2.1.0"
-  resolved "http://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz#d8fc3d284dd05794fe84973caecdd1cf824fdd85"
-  dependencies:
-    string-width "^1.0.1"
-    strip-ansi "^3.0.1"
-
 wrappy@1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
-
-xregexp@4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/xregexp/-/xregexp-4.0.0.tgz#e698189de49dd2a18cc5687b05e17c8e43943020"
-
-xtend@^4.0.0:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"
-
-"y18n@^3.2.1 || ^4.0.0":
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.0.tgz#95ef94f85ecc81d007c264e190a120f0a3c8566b"
-
-yallist@^3.0.0, yallist@^3.0.2:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.0.2.tgz#8452b4bb7e83c7c188d8041c1a837c773d6d8bb9"
-
-yargs-parser@^10.1.0:
-  version "10.1.0"
-  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-10.1.0.tgz#7202265b89f7e9e9f2e5765e0fe735a905edbaa8"
-  dependencies:
-    camelcase "^4.1.0"
-
-yargs@^12.0.2:
-  version "12.0.2"
-  resolved "https://registry.yarnpkg.com/yargs/-/yargs-12.0.2.tgz#fe58234369392af33ecbef53819171eff0f5aadc"
-  dependencies:
-    cliui "^4.0.0"
-    decamelize "^2.0.0"
-    find-up "^3.0.0"
-    get-caller-file "^1.0.1"
-    os-locale "^3.0.0"
-    require-directory "^2.1.1"
-    require-main-filename "^1.0.1"
-    set-blocking "^2.0.0"
-    string-width "^2.0.0"
-    which-module "^2.0.0"
-    y18n "^3.2.1 || ^4.0.0"
-    yargs-parser "^10.1.0"

packages/now-go/.gitignore

@@ -1,3 +1,6 @@
 node_modules
 *.log
-bin
+/go
+/analyze
+*.js
+!util/install.js

packages/now-go/.npmignore

@@ -0,0 +1,5 @@
+*.ts
+test
+tsconfig.json
+package-lock.json
+yarn.lock

packages/now-go/build.sh

@@ -1,7 +0,0 @@
-#!/usr/bin/env bash
-
-mkdir -p bin
-cd util
-GOOS=linux GOARCH=amd64 go build get-exported-function-name.go
-mv get-exported-function-name ../bin/
-

packages/now-go/download-go-bin.js

@@ -1,23 +0,0 @@
-const path = require('path');
-
-const fetch = require('node-fetch');
-const tar = require('tar');
-const getWritableDirectory = require('@now/build-utils/fs/get-writable-directory.js');
-
-const url = 'https://dl.google.com/go/go1.11.1.linux-amd64.tar.gz';
-
-module.exports = async () => {
-  const res = await fetch(url);
-  const dir = await getWritableDirectory();
-
-  if (!res.ok) {
-    throw new Error(`Failed to download: ${url}`);
-  }
-
-  return new Promise((resolve, reject) => {
-    res.body
-      .on('error', reject)
-      .pipe(tar.extract({ cwd: dir, strip: 1 }))
-      .on('finish', () => resolve(path.join(dir, 'bin', 'go')));
-  });
-};

packages/now-go/go-helpers.ts

@@ -0,0 +1,170 @@
+import tar from 'tar';
+import execa from 'execa';
+import fetch from 'node-fetch';
+import { mkdirp, pathExists } from 'fs-extra';
+import { dirname, join } from 'path';
+import { homedir } from 'os';
+import Debug from 'debug';
+
+const debug = Debug('@now/go:go-helpers');
+const archMap = new Map([['x64', 'amd64'], ['x86', '386']]);
+const platformMap = new Map([['win32', 'windows']]);
+
+// Location where the `go` binary will be installed after `postinstall`
+const GO_DIR = join(__dirname, 'go');
+const GO_BIN = join(GO_DIR, 'bin/go');
+
+const getPlatform = (p: string) => platformMap.get(p) || p;
+const getArch = (a: string) => archMap.get(a) || a;
+const getGoUrl = (version: string, platform: string, arch: string) => {
+  const goArch = getArch(arch);
+  const goPlatform = getPlatform(platform);
+  const ext = platform === 'win32' ? 'zip' : 'tar.gz';
+  return `https://dl.google.com/go/go${version}.${goPlatform}-${goArch}.${ext}`;
+};
+
+export async function getAnalyzedEntrypoint(filePath: string, modulePath = '') {
+  debug('Analyzing entrypoint %o', filePath);
+  const bin = join(__dirname, 'analyze');
+
+  const isAnalyzeExist = await pathExists(bin);
+  if (!isAnalyzeExist) {
+    const src = join(__dirname, 'util', 'analyze.go');
+    const dest = join(__dirname, 'analyze');
+    const go = await downloadGo();
+    await go.build(src, dest);
+  }
+
+  const args = [`-modpath=${modulePath}`, filePath];
+
+  const analyzed = await execa.stdout(bin, args);
+  debug('Analyzed entrypoint %o', analyzed);
+  return analyzed;
+}
+
+// Creates a `$GOPATH` directory tree, as per `go help gopath` instructions.
+// Without this, `go` won't recognize the `$GOPATH`.
+function createGoPathTree(goPath: string, platform: string, arch: string) {
+  const tuple = `${getPlatform(platform)}_${getArch(arch)}`;
+  debug('Creating GOPATH directory structure for %o (%s)', goPath, tuple);
+  return Promise.all([
+    mkdirp(join(goPath, 'bin')),
+    mkdirp(join(goPath, 'pkg', tuple)),
+  ]);
+}
+
+class GoWrapper {
+  private env: { [key: string]: string };
+  private opts: execa.Options;
+
+  constructor(env: { [key: string]: string }, opts: execa.Options = {}) {
+    if (!opts.cwd) {
+      opts.cwd = process.cwd();
+    }
+    this.env = env;
+    this.opts = opts;
+  }
+
+  private execute(...args: string[]) {
+    const { opts, env } = this;
+    debug('Exec %o', `go ${args.join(' ')}`);
+    return execa('go', args, { stdio: 'inherit', ...opts, env });
+  }
+
+  mod() {
+    return this.execute('mod', 'tidy');
+  }
+
+  get(src?: string) {
+    const args = ['get'];
+    if (src) {
+      debug('Fetching `go` dependencies for file %o', src);
+      args.push(src);
+    } else {
+      debug('Fetching `go` dependencies for cwd %o', this.opts.cwd);
+    }
+    return this.execute(...args);
+  }
+
+  build(src: string | string[], dest: string, ldsflags = '-s -w') {
+    debug('Building optimized `go` binary %o -> %o', src, dest);
+    const sources = Array.isArray(src) ? src : [src];
+    return this.execute('build', '-ldflags', ldsflags, '-o', dest, ...sources);
+  }
+}
+
+export async function createGo(
+  goPath: string,
+  platform = process.platform,
+  arch = process.arch,
+  opts: execa.Options = {},
+  goMod = false
+) {
+  const path = `${dirname(GO_BIN)}:${process.env.PATH}`;
+  const env: { [key: string]: string } = {
+    ...process.env,
+    PATH: path,
+    GOPATH: goPath,
+    ...opts.env,
+  };
+  if (goMod) {
+    env.GO111MODULE = 'on';
+  }
+  await createGoPathTree(goPath, platform, arch);
+  return new GoWrapper(env, opts);
+}
+
+export async function downloadGo(
+  dir = GO_DIR,
+  version = '1.12',
+  platform = process.platform,
+  arch = process.arch
+) {
+  // Check default `Go` in user machine
+  const isUserGo = await pathExists(join(homedir(), 'go'));
+
+  // If we found GOPATH in ENV, or default `Go` path exists
+  // asssume that user have `Go` installed
+  if (isUserGo || process.env.GOPATH !== undefined) {
+    const { stdout } = await execa('go', ['version']);
+
+    if (parseInt(stdout.split('.')[1]) >= 11) {
+      return createGo(dir, platform, arch);
+    }
+
+    throw new Error(
+      `Your current ${stdout} doesn't support Go Modules. Please update.`
+    );
+  } else {
+    // Check `Go` bin in builder CWD
+    const isGoExist = await pathExists(join(dir, 'bin'));
+    if (!isGoExist) {
+      debug(
+        'Installing `go` v%s to %o for %s %s',
+        version,
+        dir,
+        platform,
+        arch
+      );
+      const url = getGoUrl(version, platform, arch);
+      debug('Downloading `go` URL: %o', url);
+      console.log('Downloading Go ...');
+      const res = await fetch(url);
+
+      if (!res.ok) {
+        throw new Error(`Failed to download: ${url} (${res.status})`);
+      }
+
+      // TODO: use a zip extractor when `ext === "zip"`
+      await mkdirp(dir);
+      await new Promise((resolve, reject) => {
+        res.body
+          .on('error', reject)
+          .pipe(tar.extract({ cwd: dir, strip: 1 }))
+          .on('error', reject)
+          .on('finish', resolve);
+      });
+    }
+    return createGo(dir, platform, arch);
+  }
+}

packages/now-go/index.js

@@ -1,113 +0,0 @@
-const path = require('path');
-const { mkdirp, readFile, writeFile } = require('fs-extra');
-
-const execa = require('execa');
-const { createLambda } = require('@now/build-utils/lambda.js');
-const getWritableDirectory = require('@now/build-utils/fs/get-writable-directory.js');
-const download = require('@now/build-utils/fs/download.js');
-const downloadGit = require('lambda-git');
-const glob = require('@now/build-utils/fs/glob.js');
-const downloadGoBin = require('./download-go-bin');
-
-// creates a `$GOPATH` direcotry tree, as per
-// `go help gopath`'s instructions.
-// without this, Go won't recognize the `$GOPATH`
-async function createGoPathTree(goPath) {
-  await mkdirp(path.join(goPath, 'bin'));
-  await mkdirp(path.join(goPath, 'pkg', 'linux_amd64'));
-}
-
-exports.build = async ({ files, entrypoint }) => {
-  console.log('downloading files...');
-
-  const gitPath = await getWritableDirectory();
-  const goPath = await getWritableDirectory();
-  const srcPath = path.join(goPath, 'src', 'lambda');
-  const outDir = await getWritableDirectory();
-
-  await createGoPathTree(goPath);
-
-  const downloadedFiles = await download(files, srcPath);
-
-  console.log('downloading go binary...');
-  const goBin = await downloadGoBin();
-
-  console.log('downloading git binary...');
-  // downloads a git binary that works on Amazon Linux and sets
-  // `process.env.GIT_EXEC_PATH` so `go(1)` can see it
-  await downloadGit({ targetDirectory: gitPath });
-
-  const goEnv = {
-    ...process.env,
-    GOOS: 'linux',
-    GOARCH: 'amd64',
-    GOPATH: goPath,
-  };
-
-  console.log(`parsing AST for "${entrypoint}"`);
-  let handlerFunctionName = '';
-  try {
-    handlerFunctionName = await execa.stdout(
-      path.join(__dirname, 'bin', 'get-exported-function-name'),
-      [downloadedFiles[entrypoint].fsPath],
-    );
-  } catch (err) {
-    console.log(`failed to parse AST for "${entrypoint}"`);
-    throw err;
-  }
-
-  if (handlerFunctionName === '') {
-    const e = new Error(`Could not find an exported function on "${entrypoint}"`);
-    console.log(e.message);
-    throw e;
-  }
-
-  console.log(`Found exported function "${handlerFunctionName}" on "${entrypoint}"`);
-
-  const origianlMainGoContents = await readFile(path.join(__dirname, 'main.go'), 'utf8');
-  const mainGoContents = origianlMainGoContents.replace('__NOW_HANDLER_FUNC_NAME', handlerFunctionName);
-  // in order to allow the user to have `main.go`, we need our `main.go` to be called something else
-  const mainGoFileName = 'main__now__go__.go';
-
-  // we need `main.go` in the same dir as the entrypoint,
-  // otherwise `go build` will refuse to build
-  const entrypointDirname = path.dirname(downloadedFiles[entrypoint].fsPath);
-
-  // Go doesn't like to build files in different directories,
-  // so now we place `main.go` together with the user code
-  await writeFile(path.join(entrypointDirname, mainGoFileName), mainGoContents);
-
-
-  console.log('installing dependencies');
-  // `go get` will look at `*.go` (note we set `cwd`), parse
-  // the `import`s and download any packages that aren't part of the stdlib
-  try {
-    await execa(goBin, ['get'], { env: goEnv, cwd: entrypointDirname, stdio: 'inherit' });
-  } catch (err) {
-    console.log('failed to `go get`');
-    throw err;
-  }
-
-  console.log('running go build...');
-  try {
-    await execa(goBin, [
-      'build',
-      '-o', path.join(outDir, 'handler'),
-      path.join(entrypointDirname, mainGoFileName), downloadedFiles[entrypoint].fsPath,
-    ], { env: goEnv, cwd: entrypointDirname, stdio: 'inherit' });
-  } catch (err) {
-    console.log('failed to `go build`');
-    throw err;
-  }
-
-  const lambda = await createLambda({
-    files: await glob('**', outDir),
-    handler: 'handler',
-    runtime: 'go1.x',
-    environment: {},
-  });
-
-  return {
-    [entrypoint]: lambda,
-  };
-};

packages/now-go/index.ts

@@ -0,0 +1,388 @@
+import { join, sep, dirname, basename } from 'path';
+import { readFile, writeFile, pathExists, move } from 'fs-extra';
+import { homedir } from 'os';
+import execa from 'execa';
+
+import {
+  glob,
+  download,
+  createLambda,
+  getWriteableDirectory,
+  BuildOptions,
+  shouldServe,
+  Files,
+} from '@now/build-utils';
+
+import { createGo, getAnalyzedEntrypoint } from './go-helpers';
+
+interface Analyzed {
+  found?: boolean;
+  packageName: string;
+  functionName: string;
+  watch: string[];
+}
+interface BuildParamsMeta {
+  isDev: boolean | undefined;
+}
+interface BuildParamsType extends BuildOptions {
+  files: Files;
+  entrypoint: string;
+  workPath: string;
+  meta: BuildParamsMeta;
+}
+
+// Initialize private git repo for Go Modules
+async function initPrivateGit(credentials: string) {
+  await execa('git', [
+    'config',
+    '--global',
+    'credential.helper',
+    `store --file ${join(homedir(), '.git-credentials')}`,
+  ]);
+
+  await writeFile(join(homedir(), '.git-credentials'), credentials);
+}
+
+export const version = 2;
+
+export const config = {
+  maxLambdaSize: '10mb',
+};
+
+export async function build({
+  files,
+  entrypoint,
+  config,
+  workPath,
+  meta = {} as BuildParamsMeta,
+}: BuildParamsType) {
+  if (process.env.GIT_CREDENTIALS && !meta.isDev) {
+    console.log('Initialize Git credentials...');
+    await initPrivateGit(process.env.GIT_CREDENTIALS);
+  }
+
+  console.log('Downloading user files...');
+  const entrypointArr = entrypoint.split(sep);
+
+  let [goPath, outDir] = await Promise.all([
+    getWriteableDirectory(),
+    getWriteableDirectory(),
+  ]);
+
+  const srcPath = join(goPath, 'src', 'lambda');
+  let downloadedFiles;
+  if (meta.isDev) {
+    downloadedFiles = await download(files, workPath, meta);
+  } else {
+    downloadedFiles = await download(files, srcPath);
+  }
+
+  console.log(`Parsing AST for "${entrypoint}"`);
+  let analyzed: string;
+  try {
+    let goModAbsPathDir = '';
+    for (const file of Object.keys(downloadedFiles)) {
+      if (file === 'go.mod') {
+        goModAbsPathDir = dirname(downloadedFiles[file].fsPath);
+      }
+    }
+    analyzed = await getAnalyzedEntrypoint(
+      downloadedFiles[entrypoint].fsPath,
+      goModAbsPathDir
+    );
+  } catch (err) {
+    console.log(`Failed to parse AST for "${entrypoint}"`);
+    throw err;
+  }
+
+  if (!analyzed) {
+    const err = new Error(
+      `Could not find an exported function in "${entrypoint}"
+Learn more: https://zeit.co/docs/v2/deployments/official-builders/go-now-go/#entrypoint
+      `
+    );
+    console.log(err.message);
+    throw err;
+  }
+
+  const parsedAnalyzed = JSON.parse(analyzed) as Analyzed;
+
+  if (meta.isDev) {
+    const base = dirname(downloadedFiles['now.json'].fsPath);
+    const destNow = join(
+      base,
+      '.now',
+      'cache',
+      basename(entrypoint, '.go'),
+      'src',
+      'lambda'
+    );
+    // this will ensure Go rebuilt fast
+    goPath = join(base, '.now', 'cache', basename(entrypoint, '.go'));
+    await download(downloadedFiles, destNow);
+
+    downloadedFiles = await glob('**', destNow);
+  }
+
+  // find `go.mod` in downloadedFiles
+  const entrypointDirname = dirname(downloadedFiles[entrypoint].fsPath);
+  let isGoModExist = false;
+  let goModPath = '';
+  let goModPathArr: string[] = [];
+  for (const file of Object.keys(downloadedFiles)) {
+    const fileDirname = dirname(downloadedFiles[file].fsPath);
+    if (file === 'go.mod') {
+      isGoModExist = true;
+      goModPath = fileDirname;
+      goModPathArr = goModPath.split(sep);
+    } else if (file.includes('go.mod')) {
+      isGoModExist = true;
+      if (entrypointDirname === fileDirname) {
+        goModPath = fileDirname;
+        goModPathArr = goModPath.split(sep);
+      }
+    }
+  }
+
+  const input = entrypointDirname;
+  var includedFiles: Files = {};
+
+  if (config && config.includeFiles) {
+    for (const pattern of config.includeFiles) {
+      const files = await glob(pattern, input);
+      for (const assetName of Object.keys(files)) {
+        includedFiles[assetName] = files[assetName];
+      }
+    }
+  }
+
+  const handlerFunctionName = parsedAnalyzed.functionName;
+  console.log(
+    `Found exported function "${handlerFunctionName}" in "${entrypoint}"`
+  );
+
+  // check if package name other than main
+  // using `go.mod` way building the handler
+  const packageName = parsedAnalyzed.packageName;
+
+  if (isGoModExist && packageName === 'main') {
+    throw new Error('Please change `package main` to `package handler`');
+  }
+
+  if (packageName !== 'main') {
+    const go = await createGo(
+      goPath,
+      process.platform,
+      process.arch,
+      {
+        cwd: entrypointDirname,
+      },
+      true
+    );
+    if (!isGoModExist) {
+      try {
+        const defaultGoModContent = `module ${packageName}`;
+
+        await writeFile(join(entrypointDirname, 'go.mod'), defaultGoModContent);
+      } catch (err) {
+        console.log(`failed to create default go.mod for ${packageName}`);
+        throw err;
+      }
+    }
+
+    const mainModGoFileName = 'main__mod__.go';
+    const modMainGoContents = await readFile(
+      join(__dirname, mainModGoFileName),
+      'utf8'
+    );
+
+    let goPackageName = `${packageName}/${packageName}`;
+    const goFuncName = `${packageName}.${handlerFunctionName}`;
+
+    if (isGoModExist) {
+      const goModContents = await readFile(join(goModPath, 'go.mod'), 'utf8');
+      const usrModName = goModContents.split('\n')[0].split(' ')[1];
+      goPackageName = `${usrModName}/${packageName}`;
+    }
+
+    const mainModGoContents = modMainGoContents
+      .replace('__NOW_HANDLER_PACKAGE_NAME', goPackageName)
+      .replace('__NOW_HANDLER_FUNC_NAME', goFuncName);
+
+    if (goModPathArr.length > 1) {
+      // using `go.mod` path to write main__mod__.go
+      await writeFile(join(goModPath, mainModGoFileName), mainModGoContents);
+    } else {
+      // using `entrypointDirname` to write main__mod__.go
+      await writeFile(
+        join(entrypointDirname, mainModGoFileName),
+        mainModGoContents
+      );
+    }
+
+    // move user go file to folder
+    try {
+      // default path
+      let finalDestination = join(entrypointDirname, packageName, entrypoint);
+      let forceMove = false;
+
+      if (meta.isDev) {
+        forceMove = true;
+      }
+
+      // if `entrypoint` include folder, only use filename
+      if (entrypointArr.length > 1) {
+        finalDestination = join(
+          entrypointDirname,
+          packageName,
+          entrypointArr[entrypointArr.length - 1]
+        );
+      }
+
+      if (
+        dirname(downloadedFiles[entrypoint].fsPath) === goModPath ||
+        !isGoModExist
+      ) {
+        await move(downloadedFiles[entrypoint].fsPath, finalDestination, {
+          overwrite: forceMove,
+        });
+      }
+    } catch (err) {
+      console.log('failed to move entry to package folder');
+      throw err;
+    }
+
+    if (meta.isDev) {
+      let entrypointDir = entrypointDirname;
+      if (goModPathArr.length > 1) {
+        entrypointDir = goModPath;
+      }
+      const isGoModBk = await pathExists(join(entrypointDir, 'go.mod.bk'));
+      if (isGoModBk) {
+        await move(
+          join(entrypointDir, 'go.mod.bk'),
+          join(entrypointDir, 'go.mod'),
+          { overwrite: true }
+        );
+        await move(
+          join(entrypointDir, 'go.sum.bk'),
+          join(entrypointDir, 'go.sum'),
+          { overwrite: true }
+        );
+      }
+    }
+
+    console.log('Tidy `go.mod` file...');
+    try {
+      // ensure go.mod up-to-date
+      await go.mod();
+    } catch (err) {
+      console.log('failed to `go mod tidy`');
+      throw err;
+    }
+
+    console.log('Running `go build`...');
+    const destPath = join(outDir, 'handler');
+    const isGoModInRootDir = goModPathArr.length === 1;
+    const baseGoModPath = isGoModInRootDir ? entrypointDirname : goModPath;
+    try {
+      let src = [join(baseGoModPath, mainModGoFileName)];
+
+      await go.build(src, destPath, config.ldsflags);
+    } catch (err) {
+      console.log('failed to `go build`');
+      throw err;
+    }
+    if (meta.isDev) {
+      // caching for `now dev`
+      await move(
+        join(baseGoModPath, 'go.mod'),
+        join(baseGoModPath, 'go.mod.bk'),
+        { overwrite: true }
+      );
+      await move(
+        join(baseGoModPath, 'go.sum'),
+        join(baseGoModPath, 'go.sum.bk'),
+        { overwrite: true }
+      );
+    }
+  } else {
+    // legacy mode
+    // we need `main.go` in the same dir as the entrypoint,
+    // otherwise `go build` will refuse to build
+    const go = await createGo(
+      goPath,
+      process.platform,
+      process.arch,
+      {
+        cwd: entrypointDirname,
+      },
+      false
+    );
+    const origianlMainGoContents = await readFile(
+      join(__dirname, 'main.go'),
+      'utf8'
+    );
+    const mainGoContents = origianlMainGoContents.replace(
+      '__NOW_HANDLER_FUNC_NAME',
+      handlerFunctionName
+    );
+
+    // in order to allow the user to have `main.go`,
+    // we need our `main.go` to be called something else
+    const mainGoFileName = 'main__now__go__.go';
+
+    // Go doesn't like to build files in different directories,
+    // so now we place `main.go` together with the user code
+    await writeFile(join(entrypointDirname, mainGoFileName), mainGoContents);
+
+    // `go get` will look at `*.go` (note we set `cwd`), parse the `import`s
+    // and download any packages that aren't part of the stdlib
+    console.log('Running `go get`...');
+    try {
+      await go.get();
+    } catch (err) {
+      console.log('failed to `go get`');
+      throw err;
+    }
+
+    console.log('Running `go build`...');
+    const destPath = join(outDir, 'handler');
+    try {
+      const src = [
+        join(entrypointDirname, mainGoFileName),
+        downloadedFiles[entrypoint].fsPath,
+      ];
+      await go.build(src, destPath);
+    } catch (err) {
+      console.log('failed to `go build`');
+      throw err;
+    }
+  }
+
+  const lambda = await createLambda({
+    files: { ...(await glob('**', outDir)), ...includedFiles },
+    handler: 'handler',
+    runtime: 'go1.x',
+    environment: {},
+  });
+  const output = {
+    [entrypoint]: lambda,
+  };
+
+  let watch = parsedAnalyzed.watch;
+  let watchSub: string[] = [];
+  // if `entrypoint` located in subdirectory
+  // we will need to concat it with return watch array
+  if (entrypointArr.length > 1) {
+    entrypointArr.pop();
+    watchSub = parsedAnalyzed.watch.map(file => join(...entrypointArr, file));
+  }
+
+  return {
+    output,
+    watch: watch.concat(watchSub),
+  };
+}
+
+export { shouldServe };

packages/now-go/main.go

@@ -1,140 +1,10 @@
 package main
 
 import (
-	b64 "encoding/base64"
-	"encoding/json"
-	"fmt"
-	"github.com/aws/aws-lambda-go/events"
-	"github.com/aws/aws-lambda-go/lambda"
-	"io/ioutil"
-	"net"
 	"net/http"
-	"strings"
+	now "github.com/zeit/now-builders/utils/go/bridge"
 )
 
-type Request struct {
-	Host     string            `json:"host"`
-	Path     string            `json:"path"`
-	Method   string            `json`
-	Headers  map[string]string `json:"headers"`
-	Encoding string            `json"encoding,omitempty"`
-	Body     string            `json:"body"`
-}
-
-type Response struct {
-	StatusCode int               `json:"statusCode"`
-	Headers    map[string]string `json:"headers"`
-	Encoding   string            `json:"encoding,omitemtpy"`
-	Body       string            `json:"body"`
-}
-
-type ResponseError struct {
-	Code    string `json:"code"`
-	Message string `json:"message"`
-}
-
-type ResponseErrorWrapper struct {
-	Error ResponseError `json:"error"`
-}
-
-func createErrorResponse(message string, code string, statusCode int) (Response, error) {
-	obj := ResponseErrorWrapper{
-		Error: ResponseError{
-			Code:    code,
-			Message: message,
-		},
-	}
-
-	body, _ := json.Marshal(obj)
-
-	return Response{
-		StatusCode: statusCode,
-		Headers: map[string]string{
-			"Content-Type": "application/json",
-		},
-		Body: string(body),
-	}, nil
-}
-
 func main() {
-	l, err := net.Listen("tcp", ":0")
-	if err != nil {
-		panic(err)
-	}
-
-	http.HandleFunc("/", __NOW_HANDLER_FUNC_NAME)
-	go http.Serve(l, nil)
-
-	handler := func(_req events.APIGatewayProxyRequest) (Response, error) {
-		var req Request
-
-		err := json.Unmarshal([]byte(_req.Body), &req)
-
-		if err != nil {
-			fmt.Println(err)
-			return createErrorResponse("Invalid payload", "bad_request", 400)
-		}
-
-		if req.Encoding == "base64" {
-			decoded, _ := b64.StdEncoding.DecodeString(req.Body)
-			req.Body = string(decoded)
-		}
-
-		url := "http://" + l.Addr().String() + req.Path
-
-		internalReq, err := http.NewRequest(req.Method, url, strings.NewReader(req.Body))
-		if err != nil {
-			fmt.Println(err)
-			return createErrorResponse("Bad gateway", "bad_gateway", 502)
-		}
-
-		for k, v := range req.Headers {
-			internalReq.Header.Add(k, v)
-			if strings.ToLower(k) == "host" {
-				req.Host = v
-			}
-		}
-
-		client := &http.Client{}
-		internalRes, err := client.Do(internalReq)
-		if err != nil {
-			fmt.Println(err)
-			return createErrorResponse("Bad gateway", "bad_gateway", 502)
-		}
-		defer internalRes.Body.Close()
-
-		resHeaders := make(map[string]string, len(internalRes.Header))
-		var resEncoding string
-		for k, v := range internalRes.Header {
-			// FIXME: support multiple values via concatenating with ','
-			// see RFC 7230, section 3.2.2
-			if strings.ToLower(k) == "x-now-response-encoding" {
-				// we don't want to send this header down
-				resEncoding = v[0]
-			} else {
-				resHeaders[k] = v[0]
-			}
-		}
-
-		bodyBytes, err := ioutil.ReadAll(internalRes.Body)
-		if err != nil {
-			return createErrorResponse("Bad gateway", "bad_gateway", 502)
-		}
-
-		var resBody string
-		if resEncoding == "base64" {
-			resBody = b64.StdEncoding.EncodeToString(bodyBytes)
-		} else {
-			resBody = string(bodyBytes)
-		}
-
-		return Response{
-			StatusCode: internalRes.StatusCode,
-			Headers:    resHeaders,
-			Encoding:   resEncoding,
-			Body:       resBody,
-		}, nil
-	}
-
-	lambda.Start(handler)
+	now.Start(http.HandlerFunc(__NOW_HANDLER_FUNC_NAME))
 }

packages/now-go/main__mod__.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+  "net/http"
+  "__NOW_HANDLER_PACKAGE_NAME"
+
+  now "github.com/zeit/now-builders/utils/go/bridge"
+)
+
+func main() {
+  now.Start(http.HandlerFunc(__NOW_HANDLER_FUNC_NAME))
+}

packages/now-go/package.json

@@ -1,29 +1,36 @@
 {
   "name": "@now/go",
-  "version": "0.2.7",
+  "version": "0.5.1",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/zeit/now-builders.git",
+    "directory": "packages/now-go"
+  },
   "scripts": {
-    "test": "best -I test/*.js",
-    "prepublish": "./build.sh"
+    "build": "tsc",
+    "test": "tsc && jest",
+    "prepublish": "tsc"
   },
   "files": [
-    "bin",
-    "download-go-bin.js",
-    "index.js",
-    "main.go"
+    "*.js",
+    "main.go",
+    "main__mod__.go",
+    "util"
   ],
   "dependencies": {
+    "debug": "^4.1.1",
     "execa": "^1.0.0",
     "fs-extra": "^7.0.0",
-    "lambda-git": "^0.1.2",
-    "mkdirp-promise": "5.0.1",
     "node-fetch": "^2.2.1",
     "tar": "4.4.6"
   },
   "devDependencies": {
-    "@zeit/best": "0.4.3",
-    "rmfr": "2.0.0"
-  },
-  "peerDependencies": {
-    "@now/build-utils": ">=0.0.1"
+    "@types/debug": "^4.1.3",
+    "@types/execa": "^0.9.0",
+    "@types/fs-extra": "^5.0.5",
+    "@types/node-fetch": "^2.3.0",
+    "@types/tar": "^4.0.0",
+    "typescript": "^3.4.2"
   }
 }

packages/now-go/test/fixtures/01-cowsay/index.go

@@ -0,0 +1,13 @@
+package cowsay
+
+import (
+	"fmt"
+	"net/http"
+
+	say "github.com/dhruvbird/go-cowsay"
+)
+
+// Handler function
+func Handler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, say.Format("cow:RANDOMNESS_PLACEHOLDER"))
+}

packages/now-go/test/fixtures/01-cowsay/now.json

@@ -0,0 +1,11 @@
+{
+  "version": 2,
+  "builds": [
+    { "src": "index.go", "use": "@now/go" },
+    { "src": "subdirectory/index.go", "use": "@now/go" }
+  ],
+  "probes": [
+    { "path": "/", "mustContain": "cow:RANDOMNESS_PLACEHOLDER" },
+    { "path": "/subdirectory", "mustContain": "subcow:RANDOMNESS_PLACEHOLDER" }
+  ]
+}

packages/now-go/test/fixtures/01-cowsay/subdirectory/index.go

@@ -0,0 +1,13 @@
+package subcow
+
+import (
+	"fmt"
+	"net/http"
+
+	say "github.com/dhruvbird/go-cowsay"
+)
+
+// Handler function
+func Handler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, say.Format("subcow:RANDOMNESS_PLACEHOLDER"))
+}

packages/now-go/test/fixtures/03-env-vars/build-env/go.mod

@@ -0,0 +1 @@
+module build-env

packages/now-go/test/fixtures/03-env-vars/build-env/index.go

@@ -0,0 +1,17 @@
+package buildenv
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+)
+
+// Handler function
+func Handler(w http.ResponseWriter, r *http.Request) {
+	rdm := os.Getenv("RANDOMNESS_BUILD_ENV")
+	if rdm == "" {
+		fmt.Println("No build env received")
+	}
+
+	fmt.Fprintf(w, rdm+":build-env")
+}

packages/now-go/test/fixtures/03-env-vars/env/go.mod

@@ -0,0 +1 @@
+module env

packages/now-go/test/fixtures/03-env-vars/env/index.go

@@ -0,0 +1,17 @@
+package env
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+)
+
+// Handler function
+func Handler(w http.ResponseWriter, r *http.Request) {
+	rdm := os.Getenv("RANDOMNESS_ENV")
+	if rdm == "" {
+		fmt.Println("No env received")
+	}
+
+	fmt.Fprintf(w, rdm)
+}

packages/now-go/test/fixtures/03-env-vars/now.json

@@ -0,0 +1,18 @@
+{
+  "version": 2,
+  "builds": [
+    {
+      "src": "env/index.go",
+      "use": "@now/go"
+    }
+  ],
+  "env": {
+    "RANDOMNESS_ENV": "RANDOMNESS_PLACEHOLDER"
+  },
+  "probes": [
+    {
+      "path": "/env",
+      "mustContain": "RANDOMNESS_PLACEHOLDER"
+    }
+  ]
+}

packages/now-go/test/fixtures/06-content-type/index.go

@@ -0,0 +1,11 @@
+package function
+
+import (
+	"fmt"
+	"net/http"
+)
+
+// Handler function
+func Handler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "RANDOMNESS_PLACEHOLDER")
+}

packages/now-go/test/fixtures/06-content-type/now.json

@@ -0,0 +1,4 @@
+{
+  "version": 2,
+  "builds": [{ "src": "index.go", "use": "@now/go" }]
+}

packages/now-go/test/fixtures/07-content-length/now.json

@@ -0,0 +1,7 @@
+{
+  "version": 2,
+  "builds": [{ "src": "*.go", "use": "@now/go" }],
+  "env": {
+    "RANDOMNESS_ENV_VAR": "RANDOMNESS_PLACEHOLDER"
+  }
+}