Publish

- @now/bash@0.3.0
 - @now/build-utils@0.7.3
 - @now/node@0.11.0
 - @now/ruby@0.1.1

.eslintignore

@@ -12,3 +12,5 @@
 /packages/now-optipng/dist/*
 /packages/now-go/*
 /packages/now-rust/dist/*
+/packages/now-ruby/dist/*
+/packages/now-static-build/dist/*

.github/CODEOWNERS

@@ -7,3 +7,4 @@
 /packages/now-go        @styfle @sophearak
 /packages/now-python    @styfle @sophearak
 /packages/now-rust      @styfle @mike-engel @anmonteiro
+/packages/now-ruby      @styfle @coetry @nathancahill

CONTRIBUTING.md

@@ -0,0 +1,85 @@
+# Contributing
+
+When contributing to this repository, please first discuss the change you wish to make via issue or [spectrum](https://spectrum.chat/zeit) with the owners of this repository before submitting a Pull Request.
+
+Please read our [code of conduct](CODE_OF_CONDUCT.md) and follow it in all your interactions with the project.
+
+## Local development
+
+This project is configured in a monorepo pattern where one repo contains multiple npm packages. Dependencies are installed and managed with `yarn`, not `npm` CLI.
+
+To get started, execute the following:
+
+```
+git clone https://github.com/zeit/now-builders
+yarn install
+yarn bootstrap
+yarn build
+yarn lint
+yarn test
+```
+
+Make sure all the tests pass before making changes.
+
+## Verifying your change
+
+Once you are done with your changes (we even suggest doing it along the way ), make sure all the test still run by running
+
+```
+yarn build && yarn test
+```
+
+from the root of the project.
+
+If any test fails, make sure to fix it along with your changes. See [Interpreting test errors](#Interpreting-test-errors) for more information about how the tests are executed, especially the integration tests.
+
+## Pull Request Process
+
+Once you are confident that your changes work properly, open a pull request on the main repository.
+
+The pull request will be reviewed by the maintainers and the tests will be checked by our continuous integration platform.
+
+## Interpreting test errors
+
+There are 2 kinds of tests in this repository – Unit tests and Integration tests.
+
+Unit tests are run locally with `jest` and execute quickly because they are testing the smallest units of code.
+
+### Integration tests
+
+Integration tests create deployments to your ZEIT account using the `test` project name. After each test is deployed, the `probes` key is used to check if the response is the expected value. If the value doesn't match, you'll see a message explaining the difference. If the deployment failed to build, you'll see a more generic message like the following:
+
+```
+[Error: Fetched page https://test-8ashcdlew.now.sh/root.js does not contain hello Root!. Instead it contains An error occurred with this application.
+
+    NO_STATUS_CODE_FRO Response headers:
+       cache-control=s-maxage=0
+      connection=close
+      content-type=text/plain; charset=utf-8
+      date=Wed, 19 Jun 2019 18:01:37 GMT
+      server=now
+      strict-transport-security=max-age=63072000
+      transfer-encoding=chunked
+      x-now-id=iad1:hgtzj-1560967297876-44ae12559f95
+      x-now-trace=iad1]
+```
+
+In such cases you can visit the URL of the failed deployment and append `/_logs` so see the build error. In the case above, that would be https://test-8ashcdlew.now.sh/_logs
+
+The logs of this deployment will contain the actual error which may help you to understand what went wrong.
+
+### @zeit/ncc integration
+
+Some of the builders use `@zeit/ncc` to bundle files before deployment. If you suspect an error with the bundling mechanism, you can run the `ncc` CLI with a couple modifications to the test.
+
+For example if an error occurred in `now-node/test/fixtures/08-assets`
+
+```
+cd packages/now-node/test/fixtures/08-assets
+yarn install
+echo 'require("http").createServer(module.exports).listen(3000)' >> index.js
+npx @zeit/ncc@0.20.1 build index.js --source-map
+node dist
+```
+
+This will compile the test with the specific version of `ncc` and run the resulting file. If it fails here, then there is likely a bug in `ncc` and not the Builder.

README.md

@@ -23,7 +23,11 @@ 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:
+For the Stable Channel, you must do the following:
+
+- Cherry pick each commit from canary to master
+- Verify that you are _in-sync_ with canary (with the exception of the `version` line in `package.json`)
+- Deploy the modified Builders
 
 ```
 git checkout master
@@ -33,6 +37,7 @@ git cherry-pick <PR502_COMMIT_SHA>
 git cherry-pick <PR503_COMMIT_SHA>
 git cherry-pick <PR504_COMMIT_SHA>
 # ... etc ...
+git diff origin/canary
 yarn publish-stable
 ```
 
@@ -41,3 +46,7 @@ After running this publish step, GitHub Actions will take care of publishing the
 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!
+
+### Contributing
+
+See the [Contribution guidelines for this project](CONTRIBUTING.md), it also contains guidance on interpreting tests failures.

jest.config.js

@@ -1,33 +1,29 @@
 const { execSync } = require('child_process');
 const { relative } = require('path');
 
-const branch = execSync('git branch | grep "*" | cut -d " " -f2').toString();
+const branch = execSync('git branch | grep "*" | cut -d " " -f2')
+  .toString()
+  .trim();
 console.log(`Running tests on branch "${branch}"`);
-const base = branch === 'master' ? 'HEAD~1' : 'origin/canary';
-const diff = execSync(`git diff ${base} --name-only`).toString();
+const gitPath = branch === 'master' ? 'HEAD~1' : 'origin/canary...HEAD';
+const diff = execSync(`git diff ${gitPath} --name-only`).toString();
 
 const changed = diff
   .split('\n')
   .filter(item => Boolean(item) && item.includes('packages/'))
   .map(item => relative('packages', item).split('/')[0]);
 
-const matches = [];
+const matches = Array.from(new Set(changed));
 
-if (changed.length > 0) {
-  console.log('The following packages have changed:');
-
-  changed.map((item) => {
-    matches.push(item);
-    console.log(item);
-
-    return null;
-  });
-} else {
+if (matches.length === 0) {
   matches.push('now-node');
   console.log(`No packages changed, defaulting to ${matches[0]}`);
+} else {
+  console.log('The following packages have changed:');
+  console.log(matches.join('\n'));
 }
 
-const testMatch = Array.from(new Set(matches)).map(
+const testMatch = matches.map(
   item => `**/${item}/**/?(*.)+(spec|test).[jt]s?(x)`,
 );
 

package.json

@@ -12,8 +12,8 @@
   "scripts": {
     "lerna": "lerna",
     "bootstrap": "lerna bootstrap",
-    "publish-stable": "git checkout master && git pull && lerna version",
-    "publish-canary": "git checkout canary && git pull && lerna version prerelease --preid canary",
+    "publish-stable": "git checkout master && git pull && lerna version --exact",
+    "publish-canary": "git checkout canary && git pull && lerna version prerelease --preid canary --exact",
     "publish-from-github": "./.circleci/publish.sh",
     "build": "./.circleci/build.sh",
     "lint": "eslint .",

packages/now-bash/index.js

@@ -13,6 +13,15 @@ exports.config = {
   maxLambdaSize: '10mb',
 };
 
+// From this list: https://import.pw/importpw/import/docs/config.md
+const allowedConfigImports = new Set([
+  'CACHE',
+  'CURL_OPTS',
+  'DEBUG',
+  'RELOAD',
+  'SERVER',
+]);
+
 exports.analyze = ({ files, entrypoint }) => files[entrypoint].digest;
 
 exports.build = async ({
@@ -24,10 +33,23 @@ exports.build = async ({
   await download(files, srcDir);
 
   const configEnv = Object.keys(config).reduce((o, v) => {
-    o[`IMPORT_${snakeCase(v).toUpperCase()}`] = config[v]; // eslint-disable-line no-param-reassign
+    const name = snakeCase(v).toUpperCase();
+
+    if (allowedConfigImports.has(name)) {
+      o[`IMPORT_${name}`] = config[v]; // eslint-disable-line no-param-reassign
+    }
+
     return o;
   }, {});
 
+  if (config && config.import) {
+    Object.keys(config.import).forEach((key) => {
+      const name = snakeCase(key).toUpperCase();
+      // eslint-disable-next-line no-param-reassign
+      configEnv[`IMPORT_${name}`] = config.import[key];
+    });
+  }
+
   const IMPORT_CACHE = `${workPath}/.import-cache`;
   const env = Object.assign({}, process.env, configEnv, {
     PATH: `${IMPORT_CACHE}/bin:${process.env.PATH}`,

packages/now-bash/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@now/bash",
-  "version": "0.2.3",
+  "version": "0.3.0",
   "description": "Now 2.0 builder for HTTP endpoints written in Bash",
   "main": "index.js",
   "author": "Nathan Rajlich <nate@zeit.co>",

packages/now-build-utils/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@now/build-utils",
-  "version": "0.5.8",
+  "version": "0.7.3",
   "license": "MIT",
   "main": "./dist/index.js",
   "types": "./dist/index.d.js",
@@ -9,8 +9,12 @@
     "url": "https://github.com/zeit/now-builders.git",
     "directory": "packages/now-build-utils"
   },
+  "scripts": {
+    "build": "tsc",
+    "test": "tsc && jest",
+    "prepublishOnly": "tsc"
+  },
   "dependencies": {
-    "@types/cross-spawn": "6.0.0",
     "async-retry": "1.2.3",
     "async-sema": "2.1.4",
     "cross-spawn": "6.0.5",
@@ -18,24 +22,21 @@
     "fs-extra": "7.0.0",
     "glob": "7.1.3",
     "into-stream": "5.0.0",
-    "memory-fs": "0.4.1",
     "multistream": "2.1.1",
     "node-fetch": "2.2.0",
+    "semver": "6.1.1",
     "yazl": "2.4.3"
   },
-  "scripts": {
-    "build": "tsc",
-    "test": "tsc && jest",
-    "prepublish": "tsc"
-  },
   "devDependencies": {
     "@types/async-retry": "^1.2.1",
+    "@types/cross-spawn": "6.0.0",
     "@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/semver": "6.0.0",
     "@types/yazl": "^2.4.1",
     "execa": "^1.0.0",
-    "typescript": "3.3.4000"
+    "typescript": "3.5.2"
   }
 }

packages/now-build-utils/src/fs/node-version.ts

@@ -0,0 +1,45 @@
+import { intersects } from 'semver';
+import { NodeVersion } from '../types';
+
+const supportedOptions: NodeVersion[] = [
+  { major: 10, range: '10.x', runtime: 'nodejs10.x' },
+  { major: 8, range: '8.10.x', runtime: 'nodejs8.10' },
+];
+
+// This version should match Fargate's default in the PATH
+// Today that is Node 8
+export const defaultSelection = supportedOptions.find(
+  o => o.major === 8
+) as NodeVersion;
+
+export async function getSupportedNodeVersion(
+  engineRange?: string
+): Promise<NodeVersion> {
+  let selection = defaultSelection;
+
+  if (!engineRange) {
+    console.log(
+      'missing `engines` in `package.json`, using default range: ' +
+        selection.range
+    );
+  } else {
+    const found = supportedOptions.some(o => {
+      // the array is already in order so return the first
+      // match which will be the newest version of node
+      selection = o;
+      return intersects(o.range, engineRange);
+    });
+    if (found) {
+      console.log(
+        'found `engines` in `package.json`, selecting range: ' + selection.range
+      );
+    } else {
+      throw new Error(
+        'found `engines` in `package.json` with an unsupported node range: ' +
+          engineRange +
+          '\nplease use `10.x` or `8.10.x` instead'
+      );
+    }
+  }
+  return selection;
+}

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

@@ -4,6 +4,8 @@ import path from 'path';
 import spawn from 'cross-spawn';
 import { SpawnOptions } from 'child_process';
 import { deprecate } from 'util';
+import { Meta, PackageJson, NodeVersion } from '../types';
+import { getSupportedNodeVersion } from './node-version';
 
 function spawnAsync(
   command: string,
@@ -52,11 +54,32 @@ export async function runShellScript(fsPath: string) {
   return true;
 }
 
-async function scanParentDirs(destPath: string, scriptName?: string) {
+export function getSpawnOptions(
+  meta: Meta,
+  nodeVersion: NodeVersion
+): SpawnOptions {
+  const opts = {
+    env: { ...process.env },
+  };
+
+  if (!meta.isDev) {
+    opts.env.PATH = `/node${nodeVersion.major}/bin:${opts.env.PATH}`;
+  }
+
+  return opts;
+}
+
+export async function getNodeVersion(destPath: string): Promise<NodeVersion> {
+  const { packageJson } = await scanParentDirs(destPath, true);
+  const range = packageJson && packageJson.engines && packageJson.engines.node;
+  return getSupportedNodeVersion(range);
+}
+
+async function scanParentDirs(destPath: string, readPackageJson = false) {
   assert(path.isAbsolute(destPath));
 
-  let hasScript = false;
   let hasPackageLockJson = false;
+  let packageJson: PackageJson | undefined;
   let currentDestPath = destPath;
 
   // eslint-disable-next-line no-constant-condition
@@ -65,13 +88,8 @@ async function scanParentDirs(destPath: string, scriptName?: string) {
     // eslint-disable-next-line no-await-in-loop
     if (await fs.pathExists(packageJsonPath)) {
       // eslint-disable-next-line no-await-in-loop
-      if (scriptName) {
-        const packageJson = JSON.parse(
-          await fs.readFile(packageJsonPath, 'utf8')
-        );
-        hasScript = Boolean(
-          packageJson.scripts && scriptName && packageJson.scripts[scriptName]
-        );
+      if (readPackageJson) {
+        packageJson = JSON.parse(await fs.readFile(packageJsonPath, 'utf8'));
       }
       // eslint-disable-next-line no-await-in-loop
       hasPackageLockJson = await fs.pathExists(
@@ -85,13 +103,13 @@ async function scanParentDirs(destPath: string, scriptName?: string) {
     currentDestPath = newDestPath;
   }
 
-  return { hasScript, hasPackageLockJson };
+  return { hasPackageLockJson, packageJson };
 }
 
 export async function runNpmInstall(
   destPath: string,
   args: string[] = [],
-  cmd?: string
+  spawnOpts?: SpawnOptions
 ) {
   assert(path.isAbsolute(destPath));
 
@@ -99,23 +117,19 @@ export async function runNpmInstall(
   console.log(`installing to ${destPath}`);
   const { hasPackageLockJson } = await scanParentDirs(destPath);
 
-  const opts: SpawnOptions = {
-    env: {
-      ...process.env,
-    },
-  };
+  const opts = spawnOpts || { env: process.env };
 
   if (hasPackageLockJson) {
     commandArgs = args.filter(a => a !== '--prefer-offline');
     await spawnAsync(
-      cmd || 'npm',
+      'npm',
       commandArgs.concat(['install', '--unsafe-perm']),
       destPath,
       opts
     );
   } else {
     await spawnAsync(
-      cmd || 'yarn',
+      'yarn',
       commandArgs.concat(['--ignore-engines', '--cwd', destPath]),
       destPath,
       opts
@@ -129,9 +143,15 @@ export async function runPackageJsonScript(
   opts?: SpawnOptions
 ) {
   assert(path.isAbsolute(destPath));
-  const { hasScript, hasPackageLockJson } = await scanParentDirs(
+  const { packageJson, hasPackageLockJson } = await scanParentDirs(
     destPath,
-    scriptName
+    true
+  );
+  const hasScript = Boolean(
+    packageJson &&
+      packageJson.scripts &&
+      scriptName &&
+      packageJson.scripts[scriptName]
   );
   if (!hasScript) return false;
 
@@ -152,7 +172,7 @@ export async function runPackageJsonScript(
 }
 
 /**
- * installDependencies() is deprecated.
+ * @deprecate installDependencies() is deprecated.
  * Please use runNpmInstall() instead.
  */
 export const installDependencies = deprecate(

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

@@ -9,6 +9,7 @@ import {
   PrepareCacheOptions,
   ShouldServeOptions,
   Meta,
+  Config,
 } from './types';
 import { Lambda, createLambda } from './lambda';
 import download, { DownloadedFiles } from './fs/download';
@@ -20,6 +21,8 @@ import {
   runPackageJsonScript,
   runNpmInstall,
   runShellScript,
+  getNodeVersion,
+  getSpawnOptions,
 } from './fs/run-user-scripts';
 import streamToBuffer from './fs/stream-to-buffer';
 import shouldServe from './should-serve';
@@ -42,10 +45,13 @@ export {
   runPackageJsonScript,
   runNpmInstall,
   runShellScript,
+  getNodeVersion,
+  getSpawnOptions,
   streamToBuffer,
   AnalyzeOptions,
   BuildOptions,
   PrepareCacheOptions,
   ShouldServeOptions,
   shouldServe,
+  Config,
 };

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

@@ -16,7 +16,13 @@ export interface Files {
 }
 
 export interface Config {
-  [key: string]: string | string[] | boolean | number | undefined;
+  [key: string]:
+    | string
+    | string[]
+    | boolean
+    | number
+    | { [key: string]: string }
+    | undefined;
   maxLambdaSize?: string;
   includeFiles?: string | string[];
   bundle?: boolean;
@@ -24,6 +30,8 @@ export interface Config {
   helpers?: boolean;
   rust?: string;
   debug?: boolean;
+  zeroConfig?: boolean;
+  import?: { [key: string]: string };
 }
 
 export interface Meta {
@@ -162,3 +170,28 @@ export interface ShouldServeOptions {
    */
   config: Config;
 }
+
+export interface PackageJson {
+  name: string;
+  version: string;
+  engines?: {
+    [key: string]: string;
+    node: string;
+    npm: string;
+  };
+  scripts?: {
+    [key: string]: string;
+  };
+  dependencies?: {
+    [key: string]: string;
+  };
+  devDependencies?: {
+    [key: string]: string;
+  };
+}
+
+export interface NodeVersion {
+  major: number;
+  range: string;
+  runtime: string;
+}

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

@@ -6,6 +6,10 @@ const execa = require('execa');
 const assert = require('assert');
 const { glob, download } = require('../');
 const { createZip } = require('../dist/lambda');
+const {
+  getSupportedNodeVersion,
+  defaultSelection,
+} = require('../dist/fs/node-version');
 
 const {
   packAndDeploy,
@@ -64,6 +68,52 @@ it('should create zip files with symlinks properly', async () => {
   assert(aStat.isFile());
 });
 
+it('should only match supported node versions', () => {
+  expect(getSupportedNodeVersion('10.x')).resolves.toHaveProperty('major', 10);
+  expect(getSupportedNodeVersion('8.10.x')).resolves.toHaveProperty('major', 8);
+  expect(getSupportedNodeVersion('8.11.x')).rejects.toThrow();
+  expect(getSupportedNodeVersion('6.x')).rejects.toThrow();
+  expect(getSupportedNodeVersion('999.x')).rejects.toThrow();
+  expect(getSupportedNodeVersion('foo')).rejects.toThrow();
+  expect(getSupportedNodeVersion('')).resolves.toBe(defaultSelection);
+  expect(getSupportedNodeVersion(null)).resolves.toBe(defaultSelection);
+  expect(getSupportedNodeVersion(undefined)).resolves.toBe(defaultSelection);
+});
+
+it('should match all semver ranges', () => {
+  // See https://docs.npmjs.com/files/package.json#engines
+  expect(getSupportedNodeVersion('10.0.0')).resolves.toHaveProperty(
+    'major',
+    10,
+  );
+  expect(getSupportedNodeVersion('10.x')).resolves.toHaveProperty('major', 10);
+  expect(getSupportedNodeVersion('>=10')).resolves.toHaveProperty('major', 10);
+  expect(getSupportedNodeVersion('>=10.3.0')).resolves.toHaveProperty(
+    'major',
+    10,
+  );
+  expect(getSupportedNodeVersion('8.5.0 - 10.5.0')).resolves.toHaveProperty(
+    'major',
+    10,
+  );
+  expect(getSupportedNodeVersion('>=9.0.0')).resolves.toHaveProperty(
+    'major',
+    10,
+  );
+  expect(getSupportedNodeVersion('>=9.5.0 <=10.5.0')).resolves.toHaveProperty(
+    'major',
+    10,
+  );
+  expect(getSupportedNodeVersion('~10.5.0')).resolves.toHaveProperty(
+    'major',
+    10,
+  );
+  expect(getSupportedNodeVersion('^10.5.0')).resolves.toHaveProperty(
+    'major',
+    10,
+  );
+});
+
 // own fixtures
 
 const fixturesPath = path.resolve(__dirname, 'fixtures');

packages/now-go/index.ts

@@ -61,6 +61,18 @@ export async function build({
     await initPrivateGit(process.env.GIT_CREDENTIALS);
   }
 
+  if (process.env.GO111MODULE) {
+    console.log(`\nManually assigning 'GO111MODULE' is not recommended.
+
+By default:
+  - 'GO111MODULE=on' If entrypoint package name is not 'main'
+  - 'GO111MODULE=off' If entrypoint package name is 'main'
+
+We highly recommend you leverage Go Modules in your project.
+Learn more: https://github.com/golang/go/wiki/Modules
+`);
+  }
+
   console.log('Downloading user files...');
   const entrypointArr = entrypoint.split(sep);
 
@@ -128,18 +140,18 @@ Learn more: https://zeit.co/docs/v2/deployments/official-builders/go-now-go/#ent
   const entrypointDirname = dirname(downloadedFiles[entrypoint].fsPath);
   let isGoModExist = false;
   let goModPath = '';
-  let goModPathArr: string[] = [];
+  let isGoModInRootDir = false;
   for (const file of Object.keys(downloadedFiles)) {
     const fileDirname = dirname(downloadedFiles[file].fsPath);
     if (file === 'go.mod') {
       isGoModExist = true;
+      isGoModInRootDir = true;
       goModPath = fileDirname;
-      goModPathArr = goModPath.split(sep);
-    } else if (file.includes('go.mod')) {
-      isGoModExist = true;
+    } else if (file.endsWith('go.mod') && !file.endsWith('vendor')) {
       if (entrypointDirname === fileDirname) {
+        isGoModExist = true;
         goModPath = fileDirname;
-        goModPathArr = goModPath.split(sep);
+        break;
       }
     }
   }
@@ -161,6 +173,10 @@ Learn more: https://zeit.co/docs/v2/deployments/official-builders/go-now-go/#ent
     `Found exported function "${handlerFunctionName}" in "${entrypoint}"`
   );
 
+  if (!isGoModExist && 'vendor' in downloadedFiles) {
+    throw new Error('`go.mod` is required to use a `vendor` directory.');
+  }
+
   // check if package name other than main
   // using `go.mod` way building the handler
   const packageName = parsedAnalyzed.packageName;
@@ -202,14 +218,28 @@ Learn more: https://zeit.co/docs/v2/deployments/official-builders/go-now-go/#ent
     if (isGoModExist) {
       const goModContents = await readFile(join(goModPath, 'go.mod'), 'utf8');
       const usrModName = goModContents.split('\n')[0].split(' ')[1];
-      goPackageName = `${usrModName}/${packageName}`;
+
+      if (entrypointArr.length > 1 && isGoModInRootDir) {
+        let cleanPackagePath = [...entrypointArr];
+        cleanPackagePath.pop();
+        goPackageName = `${usrModName}/${cleanPackagePath.join('/')}`;
+      } else {
+        goPackageName = `${usrModName}/${packageName}`;
+      }
     }
 
     const mainModGoContents = modMainGoContents
       .replace('__NOW_HANDLER_PACKAGE_NAME', goPackageName)
       .replace('__NOW_HANDLER_FUNC_NAME', goFuncName);
 
-    if (goModPathArr.length > 1) {
+    if (meta.isDev && isGoModExist && isGoModInRootDir) {
+      await writeFile(
+        join(dirname(downloadedFiles['now.json'].fsPath), mainModGoFileName),
+        mainModGoContents
+      );
+    } else if (isGoModExist && isGoModInRootDir) {
+      await writeFile(join(srcPath, mainModGoFileName), mainModGoContents);
+    } else if (isGoModExist && !isGoModInRootDir) {
       // using `go.mod` path to write main__mod__.go
       await writeFile(join(goModPath, mainModGoFileName), mainModGoContents);
     } else {
@@ -252,21 +282,28 @@ Learn more: https://zeit.co/docs/v2/deployments/official-builders/go-now-go/#ent
       throw err;
     }
 
+    let baseGoModPath = '';
+    if (meta.isDev && isGoModExist && isGoModInRootDir) {
+      baseGoModPath = dirname(downloadedFiles['now.json'].fsPath);
+    } else if (isGoModExist && isGoModInRootDir) {
+      baseGoModPath = srcPath;
+    } else if (isGoModExist && !isGoModInRootDir) {
+      baseGoModPath = goModPath;
+    } else {
+      baseGoModPath = entrypointDirname;
+    }
+
     if (meta.isDev) {
-      let entrypointDir = entrypointDirname;
-      if (goModPathArr.length > 1) {
-        entrypointDir = goModPath;
-      }
-      const isGoModBk = await pathExists(join(entrypointDir, 'go.mod.bk'));
+      const isGoModBk = await pathExists(join(baseGoModPath, 'go.mod.bk'));
       if (isGoModBk) {
         await move(
-          join(entrypointDir, 'go.mod.bk'),
-          join(entrypointDir, 'go.mod'),
+          join(baseGoModPath, 'go.mod.bk'),
+          join(baseGoModPath, 'go.mod'),
           { overwrite: true }
         );
         await move(
-          join(entrypointDir, 'go.sum.bk'),
-          join(entrypointDir, 'go.sum'),
+          join(baseGoModPath, 'go.sum.bk'),
+          join(baseGoModPath, 'go.sum'),
           { overwrite: true }
         );
       }
@@ -283,8 +320,7 @@ Learn more: https://zeit.co/docs/v2/deployments/official-builders/go-now-go/#ent
 
     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)];
 

packages/now-go/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@now/go",
-  "version": "0.5.1",
+  "version": "0.5.3",
   "license": "MIT",
   "repository": {
     "type": "git",
@@ -31,6 +31,6 @@
     "@types/fs-extra": "^5.0.5",
     "@types/node-fetch": "^2.3.0",
     "@types/tar": "^4.0.0",
-    "typescript": "^3.4.2"
+    "typescript": "3.5.2"
   }
 }

packages/now-go/test/fixtures/13-go-mod-nested/api/nested/index.go

@@ -0,0 +1,12 @@
+package nested
+
+import (
+	"fmt"
+	"net/http"
+	"with-nested/shared"
+)
+
+// Handler func
+func Handler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, shared.Say("lol:RANDOMNESS_PLACEHOLDER"))
+}

packages/now-go/test/fixtures/13-go-mod-nested/go.mod

@@ -0,0 +1,3 @@
+module with-nested
+
+go 1.12

packages/now-go/test/fixtures/13-go-mod-nested/now.json

@@ -0,0 +1,5 @@
+{
+  "version": 2,
+  "builds": [{ "src": "api/nested/*.go", "use": "@now/go" }],
+  "probes": [{ "path": "/api/nested", "mustContain": "RANDOMNESS_PLACEHOLDER" }]
+}

packages/now-go/test/fixtures/13-go-mod-nested/shared/shared.go

@@ -0,0 +1,6 @@
+package shared
+
+// Say func
+func Say(text string) string {
+	return text
+}

packages/now-go/test/fixtures/14-go-mod-sub/api/index.go

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

packages/now-go/test/fixtures/14-go-mod-sub/now.json

@@ -0,0 +1,5 @@
+{
+  "version": 2,
+  "builds": [{ "src": "api/**/*.go", "use": "@now/go" }],
+  "probes": [{ "path": "/api", "mustContain": "RANDOMNESS_PLACEHOLDER" }]
+}

packages/now-go/test/fixtures/14-go-mod-sub/other-folder/go.mod

@@ -0,0 +1,3 @@
+module other-folder
+
+go 1.12

packages/now-go/test/fixtures/14-go-mod-sub/other-folder/index.go

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

packages/now-next/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@now/next",
-  "version": "0.4.2",
+  "version": "0.5.1",
   "license": "MIT",
   "main": "./dist/index",
   "scripts": {
@@ -14,7 +14,7 @@
     "directory": "packages/now-next"
   },
   "dependencies": {
-    "@now/node-bridge": "^1.2.0",
+    "@now/node-bridge": "1.2.2",
     "fs-extra": "^7.0.0",
     "get-port": "^5.0.0",
     "resolve-from": "^5.0.0",
@@ -28,6 +28,6 @@
     "@types/resolve-from": "^5.0.1",
     "@types/semver": "^6.0.0",
     "jest": "^24.7.1",
-    "typescript": "^3.4.3"
+    "typescript": "3.5.2"
   }
 }

packages/now-next/src/index.ts

@@ -21,6 +21,8 @@ import {
   PrepareCacheOptions,
   runNpmInstall,
   runPackageJsonScript,
+  getNodeVersion,
+  getSpawnOptions,
 } from '@now/build-utils';
 
 import nextLegacyVersions from './legacy-versions';
@@ -38,6 +40,7 @@ import {
   validateEntrypoint,
   normalizePage,
   getDynamicRoutes,
+  isDynamicRoute,
 } from './utils';
 
 interface BuildParamsMeta {
@@ -171,6 +174,9 @@ export const build = async ({
   console.log(`${name} Downloading user files...`);
   await download(files, workPath, meta);
 
+  const nodeVersion = await getNodeVersion(entryPath);
+  const spawnOpts = getSpawnOptions(meta, nodeVersion);
+
   const pkg = await readPackageJson(entryPath);
   const nextVersion = getNextVersion(pkg);
 
@@ -190,7 +196,7 @@ export const build = async ({
     // If this is the initial build, we want to start the server
     if (!urls[entrypoint]) {
       console.log(`${name} Installing dependencies...`);
-      await runNpmInstall(entryPath, ['--prefer-offline']);
+      await runNpmInstall(entryPath, ['--prefer-offline'], spawnOpts);
 
       if (!process.env.NODE_ENV) {
         process.env.NODE_ENV = 'development';
@@ -277,20 +283,22 @@ export const build = async ({
   }
 
   console.log('installing dependencies...');
-  await runNpmInstall(entryPath, ['--prefer-offline']);
+  await runNpmInstall(entryPath, ['--prefer-offline'], spawnOpts);
 
   console.log('running user script...');
   const memoryToConsume = Math.floor(os.totalmem() / 1024 ** 2) - 128;
-  await runPackageJsonScript(entryPath, 'now-build', {
-    env: {
-      ...process.env,
-      NODE_OPTIONS: `--max_old_space_size=${memoryToConsume}`,
-    },
-  } as SpawnOptions);
+  const buildSpawnOptions = { ...spawnOpts };
+  const env = { ...buildSpawnOptions.env } as any;
+  env.NODE_OPTIONS = `--max_old_space_size=${memoryToConsume}`;
+  await runPackageJsonScript(entryPath, 'now-build', buildSpawnOptions);
 
   if (isLegacy) {
     console.log('running npm install --production...');
-    await runNpmInstall(entryPath, ['--prefer-offline', '--production']);
+    await runNpmInstall(
+      entryPath,
+      ['--prefer-offline', '--production'],
+      spawnOpts
+    );
   }
 
   if (process.env.NPM_AUTH_TOKEN) {
@@ -407,7 +415,7 @@ export const build = async ({
 
       const pathname = page.replace(/\.html$/, '');
 
-      if (pathname.startsWith('$') || pathname.includes('/$')) {
+      if (isDynamicRoute(pathname)) {
         dynamicPages.push(pathname);
       }
 
@@ -454,7 +462,7 @@ export const build = async ({
 
         const pathname = page.replace(/\.js$/, '');
 
-        if (pathname.startsWith('$') || pathname.includes('/$')) {
+        if (isDynamicRoute(pathname)) {
           dynamicPages.push(normalizePage(pathname));
         }
 

packages/now-next/src/utils.ts

@@ -9,6 +9,14 @@ export interface EnvConfig {
   [name: string]: string | undefined;
 }
 
+// Identify /[param]/ in route string
+const TEST_DYNAMIC_ROUTE = /\/\[[^\/]+?\](?=\/|$)/;
+
+function isDynamicRoute(route: string): boolean {
+  route = route.startsWith('/') ? route : `/${route}`;
+  return TEST_DYNAMIC_ROUTE.test(route);
+}
+
 /**
  * Validate if the entrypoint is allowed to be used
  */
@@ -226,7 +234,7 @@ function getRoutes(
       continue;
     }
 
-    if (pageName.startsWith('$') || pageName.includes('/$')) {
+    if (isDynamicRoute(pageName)) {
       dynamicPages.push(normalizePage(pageName));
     }
 
@@ -351,4 +359,5 @@ export {
   stringMap,
   syncEnvVars,
   normalizePage,
+  isDynamicRoute,
 };

packages/now-node-bridge/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@now/node-bridge",
-  "version": "1.2.0",
+  "version": "1.2.2",
   "license": "MIT",
   "main": "./index.js",
   "repository": {
@@ -21,6 +21,6 @@
     "@types/aws-lambda": "8.10.19",
     "@types/node": "11.9.4",
     "jest": "24.1.0",
-    "typescript": "3.3.3"
+    "typescript": "3.5.2"
   }
 }

packages/now-node-bridge/src/bridge.ts

@@ -27,6 +27,16 @@ export interface NowProxyResponse {
   encoding: string;
 }
 
+interface ServerLike {
+  listen: (
+    opts: {
+      host?: string;
+      port?: number;
+    },
+    callback: (this: Server | null) => void
+  ) => Server | void;
+}
+
 /**
  * If the `http.Server` handler function throws an error asynchronously,
  * then it ends up being an unhandled rejection which doesn't kill the node
@@ -92,14 +102,14 @@ function normalizeEvent(
 }
 
 export class Bridge {
-  private server: Server | null;
+  private server: ServerLike | null;
   private listening: Promise<AddressInfo>;
   private resolveListening: (info: AddressInfo) => void;
   private events: { [key: string]: NowProxyRequest } = {};
   private reqIdSeed: number = 1;
   private shouldStoreEvents: boolean = false;
 
-  constructor(server?: Server, shouldStoreEvents: boolean = false) {
+  constructor(server?: ServerLike, shouldStoreEvents: boolean = false) {
     this.server = null;
     this.shouldStoreEvents = shouldStoreEvents;
     if (server) {
@@ -116,18 +126,8 @@ export class Bridge {
     });
   }
 
-  setServer(server: Server) {
+  setServer(server: ServerLike) {
     this.server = server;
-    server.once('listening', () => {
-      const addr = server.address();
-      if (typeof addr === 'string') {
-        throw new Error(`Unexpected string for \`server.address()\`: ${addr}`);
-      } else if (!addr) {
-        throw new Error('`server.address()` returned `null`');
-      } else {
-        this.resolveListening(addr);
-      }
-    });
   }
 
   listen() {
@@ -135,10 +135,35 @@ export class Bridge {
       throw new Error('Server has not been set!');
     }
 
-    return this.server.listen({
-      host: '127.0.0.1',
-      port: 0,
-    });
+    const resolveListening = this.resolveListening;
+
+    return this.server.listen(
+      {
+        host: '127.0.0.1',
+        port: 0,
+      },
+      function listeningCallback() {
+        if (!this || typeof this.address !== 'function') {
+          throw new Error(
+            'Missing server.address() function on `this` in server.listen()'
+          );
+        }
+
+        const addr = this.address();
+
+        if (!addr) {
+          throw new Error('`server.address()` returned `null`');
+        }
+
+        if (typeof addr === 'string') {
+          throw new Error(
+            `Unexpected string for \`server.address()\`: ${addr}`
+          );
+        }
+
+        resolveListening(addr);
+      }
+    );
   }
 
   async launcher(

packages/now-node-server/index.js

@@ -1,15 +1,17 @@
-const { createLambda } = require('@now/build-utils/lambda.js'); // eslint-disable-line import/no-extraneous-dependencies
-const download = require('@now/build-utils/fs/download.js'); // eslint-disable-line import/no-extraneous-dependencies
-const FileBlob = require('@now/build-utils/file-blob.js'); // eslint-disable-line import/no-extraneous-dependencies
-const FileFsRef = require('@now/build-utils/file-fs-ref.js'); // eslint-disable-line import/no-extraneous-dependencies
 const fs = require('fs-extra');
-const glob = require('@now/build-utils/fs/glob.js'); // eslint-disable-line import/no-extraneous-dependencies
 const path = require('path');
 const {
+  FileBlob,
+  FileFsRef,
+  download,
+  createLambda,
+  glob,
   runNpmInstall,
   runPackageJsonScript,
-} = require('@now/build-utils/fs/run-user-scripts.js'); // eslint-disable-line import/no-extraneous-dependencies
-const { shouldServe } = require('@now/build-utils'); // eslint-disable-line import/no-extraneous-dependencies
+  getNodeVersion,
+  getSpawnOptions,
+  shouldServe,
+} = require('@now/build-utils'); // eslint-disable-line import/no-extraneous-dependencies
 
 /** @typedef { import('@now/build-utils/file-ref') } FileRef */
 /** @typedef {{[filePath: string]: FileRef}} Files */
@@ -38,8 +40,15 @@ async function downloadInstallAndBundle(
 
   console.log("installing dependencies for user's code...");
   const entrypointFsDirname = path.join(workPath, path.dirname(entrypoint));
-  await runNpmInstall(entrypointFsDirname, npmArguments);
-  return [downloadedFiles, entrypointFsDirname];
+  const nodeVersion = await getNodeVersion(entrypointFsDirname);
+  const spawnOpts = getSpawnOptions(meta, nodeVersion);
+  await runNpmInstall(entrypointFsDirname, npmArguments, spawnOpts);
+  return {
+    downloadedFiles,
+    entrypointFsDirname,
+    spawnOpts,
+    nodeVersion,
+  };
 }
 
 async function compile(workPath, downloadedFiles, entrypoint, config) {
@@ -101,9 +110,14 @@ exports.config = {
  * @returns {Promise<Files>}
  */
 exports.build = async ({
-  files, entrypoint, config, workPath, meta,
+  files, entrypoint, config, workPath, meta = {},
 }) => {
-  const [downloadedFiles, entrypointFsDirname] = await downloadInstallAndBundle(
+  const {
+    downloadedFiles,
+    entrypointFsDirname,
+    spawnOptions,
+    nodeVersion,
+  } = await downloadInstallAndBundle(
     {
       files,
       entrypoint,
@@ -114,7 +128,7 @@ exports.build = async ({
   );
 
   console.log('running user script...');
-  await runPackageJsonScript(entrypointFsDirname, 'now-build');
+  await runPackageJsonScript(entrypointFsDirname, 'now-build', spawnOptions);
 
   console.log('preparing lambda files...');
   let preparedFiles;
@@ -146,7 +160,7 @@ exports.build = async ({
   const lambda = await createLambda({
     files: { ...preparedFiles, ...launcherFiles },
     handler: 'launcher.launcher',
-    runtime: 'nodejs8.10',
+    runtime: nodeVersion.runtime,
   });
 
   return { [entrypoint]: lambda };

packages/now-node-server/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@now/node-server",
-  "version": "0.7.5",
+  "version": "0.8.1",
   "license": "MIT",
   "repository": {
     "type": "git",
@@ -8,7 +8,7 @@
     "directory": "packages/now-node-server"
   },
   "dependencies": {
-    "@now/node-bridge": "^1.2.0",
+    "@now/node-bridge": "1.2.2",
     "@zeit/ncc": "0.18.5",
     "fs-extra": "7.0.1"
   },

packages/now-node/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@now/node",
-  "version": "0.9.0",
+  "version": "0.11.0",
   "license": "MIT",
   "main": "./dist/index",
   "repository": {
@@ -9,11 +9,10 @@
     "directory": "packages/now-node"
   },
   "dependencies": {
-    "@now/node-bridge": "^1.2.0",
+    "@now/node-bridge": "1.2.2",
     "@types/node": "*",
     "@zeit/ncc": "0.18.5",
-    "@zeit/ncc-watcher": "1.0.3",
-    "fs-extra": "7.0.1"
+    "@zeit/ncc-watcher": "1.0.3"
   },
   "scripts": {
     "build": "./build.sh",
@@ -26,11 +25,13 @@
   "devDependencies": {
     "@types/content-type": "1.1.3",
     "@types/cookie": "0.3.3",
+    "@types/etag": "1.8.0",
     "@types/test-listen": "1.1.0",
     "content-type": "1.0.4",
     "cookie": "0.4.0",
+    "etag": "1.8.1",
     "node-fetch": "2.6.0",
     "test-listen": "1.1.0",
-    "typescript": "3.3.3"
+    "typescript": "3.5.2"
   }
 }

packages/now-node/src/helpers.ts

@@ -5,7 +5,6 @@ import {
   NowRequestQuery,
   NowRequestBody,
 } from './types';
-import { Stream } from 'stream';
 import { Server } from 'http';
 import { Bridge } from './bridge';
 
@@ -73,56 +72,127 @@ function getCookieParser(req: NowRequest) {
   };
 }
 
-function sendStatusCode(res: NowResponse, statusCode: number): NowResponse {
+function status(res: NowResponse, statusCode: number): NowResponse {
   res.statusCode = statusCode;
   return res;
 }
 
-function sendData(res: NowResponse, body: any): NowResponse {
-  if (body === null) {
+function setCharset(type: string, charset: string) {
+  const { parse, format } = require('content-type');
+  const parsed = parse(type);
+  parsed.parameters.charset = charset;
+  return format(parsed);
+}
+
+function createETag(body: any, encoding: string | undefined) {
+  const etag = require('etag');
+  const buf = !Buffer.isBuffer(body) ? Buffer.from(body, encoding) : body;
+  return etag(buf, { weak: true });
+}
+
+function send(req: NowRequest, res: NowResponse, body: any): NowResponse {
+  let chunk: unknown = body;
+  let encoding: string | undefined;
+
+  switch (typeof chunk) {
+    // string defaulting to html
+    case 'string':
+      if (!res.getHeader('content-type')) {
+        res.setHeader('content-type', 'text/html');
+      }
+      break;
+    case 'boolean':
+    case 'number':
+    case 'object':
+      if (chunk === null) {
+        chunk = '';
+      } else if (Buffer.isBuffer(chunk)) {
+        if (!res.getHeader('content-type')) {
+          res.setHeader('content-type', 'application/octet-stream');
+        }
+      } else {
+        return json(req, res, chunk);
+      }
+      break;
+  }
+
+  // write strings in utf-8
+  if (typeof chunk === 'string') {
+    encoding = 'utf8';
+
+    // reflect this in content-type
+    const type = res.getHeader('content-type');
+    if (typeof type === 'string') {
+      res.setHeader('content-type', setCharset(type, 'utf-8'));
+    }
+  }
+
+  // populate Content-Length
+  let len: number | undefined;
+  if (chunk !== undefined) {
+    if (Buffer.isBuffer(chunk)) {
+      // get length of Buffer
+      len = chunk.length;
+    } else if (typeof chunk === 'string') {
+      if (chunk.length < 1000) {
+        // just calculate length small chunk
+        len = Buffer.byteLength(chunk, encoding);
+      } else {
+        // convert chunk to Buffer and calculate
+        const buf = Buffer.from(chunk, encoding);
+        len = buf.length;
+        chunk = buf;
+        encoding = undefined;
+      }
+    } else {
+      throw new Error(
+        '`body` is not a valid string, object, boolean, number, Stream, or Buffer'
+      );
+    }
+
+    if (len !== undefined) {
+      res.setHeader('content-length', len);
+    }
+  }
+
+  // populate ETag
+  let etag: string | undefined;
+  if (
+    !res.getHeader('etag') &&
+    len !== undefined &&
+    (etag = createETag(chunk, encoding))
+  ) {
+    res.setHeader('etag', etag);
+  }
+
+  // strip irrelevant headers
+  if (204 === res.statusCode || 304 === res.statusCode) {
+    res.removeHeader('Content-Type');
+    res.removeHeader('Content-Length');
+    res.removeHeader('Transfer-Encoding');
+    chunk = '';
+  }
+
+  if (req.method === 'HEAD') {
+    // skip body for HEAD
     res.end();
-    return res;
+  } else {
+    // respond
+    res.end(chunk, encoding);
   }
 
-  const contentType = res.getHeader('Content-Type');
-
-  if (Buffer.isBuffer(body)) {
-    if (!contentType) {
-      res.setHeader('Content-Type', 'application/octet-stream');
-    }
-    res.setHeader('Content-Length', body.length);
-    res.end(body);
-    return res;
-  }
-
-  if (body instanceof Stream) {
-    if (!contentType) {
-      res.setHeader('Content-Type', 'application/octet-stream');
-    }
-    body.pipe(res);
-    return res;
-  }
-
-  let str = body;
-
-  // Stringify JSON body
-  if (typeof body === 'object' || typeof body === 'number') {
-    str = JSON.stringify(body);
-    res.setHeader('Content-Type', 'application/json; charset=utf-8');
-  }
-
-  res.setHeader('Content-Length', Buffer.byteLength(str));
-  res.end(str);
-
   return res;
 }
 
-function sendJson(res: NowResponse, jsonBody: any): NowResponse {
-  // Set header to application/json
-  res.setHeader('Content-Type', 'application/json; charset=utf-8');
+function json(req: NowRequest, res: NowResponse, jsonBody: any): NowResponse {
+  const body = JSON.stringify(jsonBody);
 
-  // Use send to handle request
-  return res.send(jsonBody);
+  // content-type
+  if (!res.getHeader('content-type')) {
+    res.setHeader('content-type', 'application/json; charset=utf-8');
+  }
+
+  return send(req, res, body);
 }
 
 export class ApiError extends Error {
@@ -186,9 +256,9 @@ export function createServerWithHelpers(
       setLazyProp<NowRequestQuery>(req, 'query', getQueryParser(req));
       setLazyProp<NowRequestBody>(req, 'body', getBodyParser(req, event.body));
 
-      res.status = statusCode => sendStatusCode(res, statusCode);
-      res.send = data => sendData(res, data);
-      res.json = data => sendJson(res, data);
+      res.status = statusCode => status(res, statusCode);
+      res.send = body => send(req, res, body);
+      res.json = jsonBody => json(req, res, jsonBody);
 
       await listener(req, res);
     } catch (err) {

packages/now-node/src/index.ts

@@ -1,4 +1,3 @@
-import { readFile } from 'fs-extra';
 import { Assets, NccOptions } from '@zeit/ncc';
 import { join, dirname, relative, sep } from 'path';
 import { NccWatcher, WatcherResult } from '@zeit/ncc-watcher';
@@ -12,11 +11,14 @@ import {
   createLambda,
   runNpmInstall,
   runPackageJsonScript,
+  getNodeVersion,
+  getSpawnOptions,
   PrepareCacheOptions,
   BuildOptions,
   shouldServe,
 } from '@now/build-utils';
 export { NowRequest, NowResponse } from './types';
+import { makeLauncher } from './launcher';
 
 interface CompilerConfig {
   includeFiles?: string | string[];
@@ -58,10 +60,12 @@ async function downloadInstallAndBundle({
 
   console.log("installing dependencies for user's code...");
   const entrypointFsDirname = join(workPath, dirname(entrypoint));
-  await runNpmInstall(entrypointFsDirname, ['--prefer-offline']);
+  const nodeVersion = await getNodeVersion(entrypointFsDirname);
+  const spawnOpts = getSpawnOptions(meta, nodeVersion);
+  await runNpmInstall(entrypointFsDirname, ['--prefer-offline'], spawnOpts);
 
   const entrypointPath = downloadedFiles[entrypoint].fsPath;
-  return { entrypointPath, entrypointFsDirname };
+  return { entrypointPath, entrypointFsDirname, nodeVersion, spawnOpts };
 }
 
 async function compile(
@@ -97,7 +101,8 @@ async function compile(
     assets = result.assets;
     watch = [...result.files, ...result.dirs, ...result.missing]
       .filter(f => f.startsWith(workPath))
-      .map(f => relative(workPath, f));
+      .map(f => relative(workPath, f))
+      .concat(Object.keys(assets || {}));
   } else {
     const ncc = require('@zeit/ncc');
     const result = await ncc(input, {
@@ -178,6 +183,8 @@ export async function build({
   const {
     entrypointPath,
     entrypointFsDirname,
+    nodeVersion,
+    spawnOpts,
   } = await downloadInstallAndBundle({
     files,
     entrypoint,
@@ -186,7 +193,7 @@ export async function build({
   });
 
   console.log('running user script...');
-  await runPackageJsonScript(entrypointFsDirname, 'now-build');
+  await runPackageJsonScript(entrypointFsDirname, 'now-build', spawnOpts);
 
   console.log('compiling entrypoint with ncc...');
   const { preparedFiles, watch } = await compile(
@@ -196,28 +203,11 @@ export async function build({
     config,
     meta
   );
-  const launcherPath = join(__dirname, 'launcher.js');
-  let launcherData = await readFile(launcherPath, 'utf8');
-
-  launcherData = launcherData.replace(
-    '// PLACEHOLDER:shouldStoreProxyRequests',
-    shouldAddHelpers ? 'shouldStoreProxyRequests = true;' : ''
-  );
-
-  launcherData = launcherData.replace(
-    '// PLACEHOLDER:setServer',
-    [
-      `let listener = require("./${entrypoint}");`,
-      'if (listener.default) listener = listener.default;',
-      shouldAddHelpers
-        ? 'const server = require("./helpers").createServerWithHelpers(listener, bridge);'
-        : 'const server = require("http").createServer(listener);',
-      'bridge.setServer(server);',
-    ].join(' ')
-  );
 
   const launcherFiles: Files = {
-    'launcher.js': new FileBlob({ data: launcherData }),
+    'launcher.js': new FileBlob({
+      data: makeLauncher(entrypoint, shouldAddHelpers),
+    }),
     'bridge.js': new FileFsRef({ fsPath: require('@now/node-bridge') }),
   };
 
@@ -233,7 +223,7 @@ export async function build({
       ...launcherFiles,
     },
     handler: 'launcher.launcher',
-    runtime: 'nodejs8.10',
+    runtime: nodeVersion.runtime,
   });
 
   const output = { [entrypoint]: lambda };

packages/now-node/src/launcher.ts

@@ -1,9 +1,10 @@
-import { Bridge } from './bridge';
+export function makeLauncher(
+  entrypoint: string,
+  shouldAddHelpers: boolean
+): string {
+  return `const { Bridge } = require("./bridge");
 
-let shouldStoreProxyRequests: boolean = false;
-// PLACEHOLDER:shouldStoreProxyRequests
-
-const bridge = new Bridge(undefined, shouldStoreProxyRequests);
+let bridge;
 
 if (!process.env.NODE_ENV) {
   process.env.NODE_ENV =
@@ -11,13 +12,35 @@ if (!process.env.NODE_ENV) {
 }
 
 try {
-  // PLACEHOLDER:setServer
+  let listener = require("./${entrypoint}");
+  if (listener.default) listener = listener.default;
+
+  if(typeof listener.listen === 'function') {
+    const server = listener;
+    bridge = new Bridge(server);
+  } else if(typeof listener === 'function') {
+    ${
+      shouldAddHelpers
+        ? [
+            'bridge = new Bridge(undefined, true);',
+            'const server = require("./helpers").createServerWithHelpers(listener, bridge);',
+            'bridge.setServer(server);',
+          ].join('\n')
+        : [
+            'const server = require("http").createServer(listener);',
+            'bridge = new Bridge(server);',
+          ].join('\n')
+    }
+  } else {
+    console.error('Export in entrypoint is not valid');
+    console.error('Did you forget to export a function or a server?');
+    process.exit(1);
+  }
+
 } catch (err) {
   if (err.code === 'MODULE_NOT_FOUND') {
     console.error(err.message);
-    console.error(
-      'Did you forget to add it to "dependencies" in `package.json`?'
-    );
+    console.error('Did you forget to add it to "dependencies" in \`package.json\`?');
     process.exit(1);
   } else {
     console.error(err);
@@ -27,4 +50,5 @@ try {
 
 bridge.listen();
 
-exports.launcher = bridge.launcher;
+exports.launcher = bridge.launcher;`;
+}

packages/now-node/src/types.ts

@@ -12,6 +12,6 @@ export type NowRequest = IncomingMessage & {
 
 export type NowResponse = ServerResponse & {
   send: (body: any) => NowResponse;
-  json: (body: any) => NowResponse;
+  json: (jsonBody: any) => NowResponse;
   status: (statusCode: number) => NowResponse;
 };

packages/now-node/test/fixtures/10-node-engines/empty/index.js

@@ -0,0 +1,3 @@
+module.exports = (req, res) => {
+  res.end(`RANDOMNESS_PLACEHOLDER:${process.versions.node}`);
+};

packages/now-node/test/fixtures/10-node-engines/empty/package.json

@@ -0,0 +1,3 @@
+{
+  "name": "missing-engines-key-on-purpose"
+}

packages/now-node/test/fixtures/10-node-engines/exact/index.js

@@ -0,0 +1,3 @@
+module.exports = (req, res) => {
+  res.end(`RANDOMNESS_PLACEHOLDER:${process.versions.node}`);
+};

packages/now-node/test/fixtures/10-node-engines/exact/package.json

@@ -0,0 +1,5 @@
+{
+  "engines": {
+    "node": "10.5.0"
+  }
+}

packages/now-node/test/fixtures/10-node-engines/greater/index.js

@@ -0,0 +1,3 @@
+module.exports = (req, res) => {
+  res.end(`RANDOMNESS_PLACEHOLDER:${process.versions.node}`);
+};

packages/now-node/test/fixtures/10-node-engines/greater/package.json

@@ -0,0 +1,5 @@
+{
+  "engines": {
+    "node": ">=10.0.0"
+  }
+}

packages/now-node/test/fixtures/10-node-engines/major/index.js

@@ -0,0 +1,3 @@
+module.exports = (req, res) => {
+  res.end(`RANDOMNESS_PLACEHOLDER:${process.versions.node}`);
+};

packages/now-node/test/fixtures/10-node-engines/major/package.json

@@ -0,0 +1,5 @@
+{
+  "engines": {
+    "node": "10.x"
+  }
+}

packages/now-node/test/fixtures/10-node-engines/now.json

@@ -0,0 +1,11 @@
+{
+  "version": 2,
+  "builds": [{ "src": "**/*.js", "use": "@now/node" }],
+  "probes": [
+    { "path": "/empty", "mustContain": "RANDOMNESS_PLACEHOLDER:8" },
+    { "path": "/exact", "mustContain": "RANDOMNESS_PLACEHOLDER:10" },
+    { "path": "/greater", "mustContain": "RANDOMNESS_PLACEHOLDER:10" },
+    { "path": "/major", "mustContain": "RANDOMNESS_PLACEHOLDER:10" },
+    { "path": "/range", "mustContain": "RANDOMNESS_PLACEHOLDER:10" }
+  ]
+}

packages/now-node/test/fixtures/10-node-engines/range/index.js

@@ -0,0 +1,3 @@
+module.exports = (req, res) => {
+  res.end(`RANDOMNESS_PLACEHOLDER:${process.versions.node}`);
+};

packages/now-node/test/fixtures/10-node-engines/range/package.json

@@ -0,0 +1,5 @@
+{
+  "engines": {
+    "node": "10.x"
+  }
+}

packages/now-node/test/fixtures/15-helpers/express-compat/index.js

@@ -1,20 +0,0 @@
-/* eslint-disable prefer-destructuring */
-const express = require('express');
-
-const app = express();
-
-module.exports = app;
-
-app.use(express.json());
-
-app.all('*', (req, res) => {
-  res.status(200);
-
-  let who = 'anonymous';
-
-  if (req.body && req.body.who) {
-    who = req.body.who;
-  }
-
-  res.send(`hello ${who}:RANDOMNESS_PLACEHOLDER`);
-});

packages/now-node/test/fixtures/15-helpers/now.json

@@ -3,7 +3,6 @@
   "builds": [
     { "src": "index.js", "use": "@now/node" },
     { "src": "ts/index.ts", "use": "@now/node" },
-    { "src": "express-compat/index.js", "use": "@now/node" },
     { "src": "micro-compat/index.js", "use": "@now/node" },
     {
       "src": "no-helpers/index.js",
@@ -35,12 +34,6 @@
       "path": "/ts",
       "mustContain": "hello:RANDOMNESS_PLACEHOLDER"
     },
-    {
-      "path": "/express-compat",
-      "method": "POST",
-      "body": { "who": "sara" },
-      "mustContain": "hello sara:RANDOMNESS_PLACEHOLDER"
-    },
     {
       "path": "/micro-compat",
       "method": "POST",

packages/now-node/test/fixtures/16-servers/express/index.js

@@ -0,0 +1,9 @@
+const express = require('express');
+
+const app = express();
+
+app.all('*', (req, res) => {
+  res.send('hello from express:RANDOMNESS_PLACEHOLDER');
+});
+
+module.exports = app;

packages/now-node/test/fixtures/16-servers/hapi/index.js

@@ -0,0 +1,17 @@
+const Hapi = require('@hapi/hapi');
+
+const server = Hapi.server({
+  port: 3000,
+  host: 'localhost',
+});
+
+server.route({
+  method: 'GET',
+  path: '/{p*}',
+  handler: () => 'hello from hapi:RANDOMNESS_PLACEHOLDER',
+});
+
+// server.listener is a node's http.Server
+// server does not have the `listen` method so we need to export this instead
+
+module.exports = server.listener;

packages/now-node/test/fixtures/16-servers/hapi/package.json

@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "@hapi/hapi": "18.3.1"
+  }
+}

packages/now-node/test/fixtures/16-servers/index.js

@@ -0,0 +1,7 @@
+const http = require('http');
+
+const server = http.createServer((req, res) => {
+  res.end('hello:RANDOMNESS_PLACEHOLDER');
+});
+
+module.exports = server;

packages/now-node/test/fixtures/16-servers/koa/index.js

@@ -0,0 +1,9 @@
+const Koa = require('koa');
+
+const app = new Koa();
+
+app.use(async (ctx) => {
+  ctx.body = 'hello from koa:RANDOMNESS_PLACEHOLDER';
+});
+
+module.exports = app;

packages/now-node/test/fixtures/16-servers/koa/package.json

@@ -0,0 +1,5 @@
+{
+  "dependencies": {
+    "koa": "2.7.0"
+  }
+}

packages/now-node/test/fixtures/16-servers/now.json

@@ -0,0 +1,22 @@
+{
+  "version": 2,
+  "builds": [{ "src": "**/*.js", "use": "@now/node" }],
+  "probes": [
+    {
+      "path": "/",
+      "mustContain": "hello:RANDOMNESS_PLACEHOLDER"
+    },
+    {
+      "path": "/express",
+      "mustContain": "hello from express:RANDOMNESS_PLACEHOLDER"
+    },
+    {
+      "path": "/koa",
+      "mustContain": "hello from koa:RANDOMNESS_PLACEHOLDER"
+    },
+    {
+      "path": "/hapi",
+      "mustContain": "hello from hapi:RANDOMNESS_PLACEHOLDER"
+    }
+  ]
+}

packages/now-optipng/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@now/optipng",
-  "version": "0.6.2",
+  "version": "0.6.3",
   "license": "MIT",
   "main": "./dist/index",
   "files": [
@@ -21,6 +21,6 @@
   },
   "devDependencies": {
     "@types/node": "11.9.4",
-    "typescript": "3.3.3"
+    "typescript": "3.5.2"
   }
 }

packages/now-python/now_init.py

@@ -2,11 +2,11 @@ from http.server import BaseHTTPRequestHandler
 
 import base64
 import json
+import inspect
 
 import __NOW_HANDLER_FILENAME
 __now_variables = dir(__NOW_HANDLER_FILENAME)
 
-
 if 'handler' in __now_variables or 'Handler' in __now_variables:
     base = __NOW_HANDLER_FILENAME.handler if ('handler' in __now_variables) else  __NOW_HANDLER_FILENAME.Handler
     if not issubclass(base, BaseHTTPRequestHandler):
@@ -47,76 +47,202 @@ if 'handler' in __now_variables or 'Handler' in __now_variables:
             'body': res.text,
         }
 elif 'app' in __now_variables:
-    print('using Web Server Gateway Interface (WSGI)')
-    import sys
-    from urllib.parse import urlparse, unquote
-    from werkzeug._compat import BytesIO
-    from werkzeug._compat import string_types
-    from werkzeug._compat import to_bytes
-    from werkzeug._compat import wsgi_encoding_dance
-    from werkzeug.datastructures import Headers
-    from werkzeug.wrappers import Response
-    def now_handler(event, context):
-        payload = json.loads(event['body'])
+    if not inspect.iscoroutinefunction(__NOW_HANDLER_FILENAME.app.__call__):
+        print('using Web Server Gateway Interface (WSGI)')
+        import sys
+        from urllib.parse import urlparse, unquote
+        from werkzeug._compat import BytesIO
+        from werkzeug._compat import string_types
+        from werkzeug._compat import to_bytes
+        from werkzeug._compat import wsgi_encoding_dance
+        from werkzeug.datastructures import Headers
+        from werkzeug.wrappers import Response
+        def now_handler(event, context):
+            payload = json.loads(event['body'])
 
-        headers = Headers(payload.get('headers', {}))
+            headers = Headers(payload.get('headers', {}))
 
-        body = payload.get('body', '')
-        if body != '':
+            body = payload.get('body', '')
+            if body != '':
+                if payload.get('encoding') == 'base64':
+                    body = base64.b64decode(body)
+            if isinstance(body, string_types):
+                body = to_bytes(body, charset='utf-8')
+
+            url = urlparse(unquote(payload['path']))
+            query = url.query
+            path = url.path
+
+            environ = {
+                'CONTENT_LENGTH': str(len(body)),
+                'CONTENT_TYPE': headers.get('content-type', ''),
+                'PATH_INFO': path,
+                'QUERY_STRING': query,
+                'REMOTE_ADDR': headers.get(
+                    'x-forwarded-for', headers.get(
+                        'x-real-ip', payload.get(
+                            'true-client-ip', ''))),
+                'REQUEST_METHOD': payload['method'],
+                'SERVER_NAME': headers.get('host', 'lambda'),
+                'SERVER_PORT': headers.get('x-forwarded-port', '80'),
+                'SERVER_PROTOCOL': 'HTTP/1.1',
+                'event': event,
+                'context': context,
+                'wsgi.errors': sys.stderr,
+                'wsgi.input': BytesIO(body),
+                'wsgi.multiprocess': False,
+                'wsgi.multithread': False,
+                'wsgi.run_once': False,
+                'wsgi.url_scheme': headers.get('x-forwarded-proto', 'http'),
+                'wsgi.version': (1, 0),
+            }
+
+            for key, value in environ.items():
+                if isinstance(value, string_types) and key != 'QUERY_STRING':
+                    environ[key] = wsgi_encoding_dance(value)
+
+            for key, value in headers.items():
+                key = 'HTTP_' + key.upper().replace('-', '_')
+                if key not in ('HTTP_CONTENT_TYPE', 'HTTP_CONTENT_LENGTH'):
+                    environ[key] = value
+
+            response = Response.from_app(__NOW_HANDLER_FILENAME.app, environ)
+
+            return_dict = {
+                'statusCode': response.status_code,
+                'headers': dict(response.headers)
+            }
+
+            if response.data:
+                return_dict['body'] = base64.b64encode(response.data).decode('utf-8')
+                return_dict['encoding'] = 'base64'
+
+            return return_dict
+    else:
+        print('using Asynchronous Server Gateway Interface (ASGI)')
+        import asyncio
+        import enum
+        from urllib.parse import urlparse, unquote, urlencode
+
+
+        class ASGICycleState(enum.Enum):
+            REQUEST = enum.auto()
+            RESPONSE = enum.auto()
+
+
+        class ASGICycle:
+            def __init__(self, scope):
+                self.scope = scope
+                self.body = b''
+                self.state = ASGICycleState.REQUEST
+                self.app_queue = None
+                self.response = {}
+
+            def __call__(self, app, body):
+                """
+                Receives the application and any body included in the request, then builds the
+                ASGI instance using the connection scope.
+                Runs until the response is completely read from the application.
+                """
+                loop = asyncio.new_event_loop()
+                self.app_queue = asyncio.Queue(loop=loop)
+                self.put_message({'type': 'http.request', 'body': body, 'more_body': False})
+
+                asgi_instance = app(self.scope, self.receive, self.send)
+
+                asgi_task = loop.create_task(asgi_instance)
+                loop.run_until_complete(asgi_task)
+                return self.response
+
+            def put_message(self, message):
+                self.app_queue.put_nowait(message)
+
+            async def receive(self):
+                """
+                Awaited by the application to receive messages in the queue.
+                """
+                message = await self.app_queue.get()
+                return message
+
+            async def send(self, message):
+                """
+                Awaited by the application to send messages to the current cycle instance.
+                """
+                message_type = message['type']
+
+                if self.state is ASGICycleState.REQUEST:
+                    if message_type != 'http.response.start':
+                        raise RuntimeError(
+                            f"Expected 'http.response.start', received: {message_type}"
+                        )
+
+                    status_code = message['status']
+                    headers = {k: v for k, v in message.get('headers', [])}
+
+                    self.on_request(headers, status_code)
+                    self.state = ASGICycleState.RESPONSE
+
+                elif self.state is ASGICycleState.RESPONSE:
+                    if message_type != 'http.response.body':
+                        raise RuntimeError(
+                            f"Expected 'http.response.body', received: {message_type}"
+                        )
+
+                    body = message.get('body', b'')
+                    more_body = message.get('more_body', False)
+
+                    # The body must be completely read before returning the response.
+                    self.body += body
+
+                    if not more_body:
+                        self.on_response()
+                        self.put_message({'type': 'http.disconnect'})
+
+            def on_request(self, headers, status_code):
+                self.response['statusCode'] = status_code
+                self.response['headers'] = {k.decode(): v.decode() for k, v in headers.items()}
+
+            def on_response(self):
+                if self.body:
+                    self.response['body'] = base64.b64encode(self.body).decode('utf-8')
+                    self.response['encoding'] = 'base64'
+
+        def now_handler(event, context):
+            payload = json.loads(event['body'])
+
+            headers = payload.get('headers', {})
+
+            body = payload.get('body', b'')
             if payload.get('encoding') == 'base64':
                 body = base64.b64decode(body)
-        if isinstance(body, string_types):
-            body = to_bytes(body, charset='utf-8')
+            elif not isinstance(body, bytes):
+                body = body.encode()
 
-        url = urlparse(unquote(payload['path']))
-        query = url.query
-        path = url.path
+            url = urlparse(unquote(payload['path']))
+            query = url.query.encode()
+            path = url.path
 
-        environ = {
-            'CONTENT_LENGTH': str(len(body)),
-            'CONTENT_TYPE': headers.get('content-type', ''),
-            'PATH_INFO': path,
-            'QUERY_STRING': query,
-            'REMOTE_ADDR': headers.get(
-                'x-forwarded-for', headers.get(
-                    'x-real-ip', payload.get(
-                        'true-client-ip', ''))),
-            'REQUEST_METHOD': payload['method'],
-            'SERVER_NAME': headers.get('host', 'lambda'),
-            'SERVER_PORT': headers.get('x-forwarded-port', '80'),
-            'SERVER_PROTOCOL': 'HTTP/1.1',
-            'event': event,
-            'context': context,
-            'wsgi.errors': sys.stderr,
-            'wsgi.input': BytesIO(body),
-            'wsgi.multiprocess': False,
-            'wsgi.multithread': False,
-            'wsgi.run_once': False,
-            'wsgi.url_scheme': headers.get('x-forwarded-proto', 'http'),
-            'wsgi.version': (1, 0),
-        }
+            scope = {
+                'server': (headers.get('host', 'lambda'), headers.get('x-forwarded-port', 80)),
+                'client': (headers.get(
+                    'x-forwarded-for', headers.get(
+                        'x-real-ip', payload.get(
+                            'true-client-ip', ''))), 0),
+                'scheme': headers.get('x-forwarded-proto', 'http'),
+                'root_path': '',
+                'query_string': query,
+                'headers': [[k.lower().encode(), v.encode()] for k, v in headers.items()],
+                'type': 'http',
+                'http_version': '1.1',
+                'method': payload['method'],
+                'path': path,
+                'raw_path': path.encode(),
+            }
 
-        for key, value in environ.items():
-            if isinstance(value, string_types) and key != 'QUERY_STRING':
-                environ[key] = wsgi_encoding_dance(value)
+            asgi_cycle = ASGICycle(scope)
+            response = asgi_cycle(__NOW_HANDLER_FILENAME.app, body)
+            return response
 
-        for key, value in headers.items():
-            key = 'HTTP_' + key.upper().replace('-', '_')
-            if key not in ('HTTP_CONTENT_TYPE', 'HTTP_CONTENT_LENGTH'):
-                environ[key] = value
-
-        response = Response.from_app(__NOW_HANDLER_FILENAME.app, environ)
-
-        return_dict = {
-            'statusCode': response.status_code,
-            'headers': dict(response.headers)
-        }
-
-        if response.data:
-            return_dict['body'] = base64.b64encode(response.data).decode('utf-8')
-            return_dict['encoding'] = 'base64'
-
-        return return_dict
 else:
     print('Missing variable `handler` or `app` in file __NOW_HANDLER_FILENAME.py')
     print('See the docs https://zeit.co/docs/v2/deployments/official-builders/python-now-python')

packages/now-python/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@now/python",
-  "version": "0.2.7",
+  "version": "0.2.9",
   "main": "./dist/index.js",
   "license": "MIT",
   "files": [
@@ -23,6 +23,6 @@
   },
   "devDependencies": {
     "@types/execa": "^0.9.0",
-    "typescript": "3.3.4000"
+    "typescript": "3.5.2"
   }
 }

packages/now-python/src/index.ts

@@ -104,7 +104,6 @@ export const build = async ({
     workPath = destNow;
   }
 
-  const foundLockFile = 'Pipfile.lock' in downloadedFiles;
   const pyUserBase = await getWriteableDirectory();
   process.env.PYTHONUSERBASE = pyUserBase;
   const pipPath = 'pip3';
@@ -129,17 +128,25 @@ export const build = async ({
   await pipInstall(pipPath, workPath, 'werkzeug');
   await pipInstall(pipPath, workPath, 'requests');
 
-  if (foundLockFile) {
+  let fsFiles = await glob('**', workPath);
+  const entryDirectory = dirname(entrypoint);
+
+  const pipfileLockDir = fsFiles[join(entryDirectory, 'Pipfile.lock')]
+    ? join(workPath, entryDirectory)
+    : fsFiles['Pipfile.lock']
+    ? workPath
+    : null;
+
+  if (pipfileLockDir) {
     console.log('found "Pipfile.lock"');
 
     // Install pipenv.
     await pipInstallUser(pipPath, ' pipenv_to_requirements');
 
-    await pipenvInstall(pyUserBase, workPath);
+    await pipenvInstall(pyUserBase, pipfileLockDir);
   }
 
-  const fsFiles = await glob('**', workPath);
-  const entryDirectory = dirname(entrypoint);
+  fsFiles = await glob('**', workPath);
   const requirementsTxt = join(entryDirectory, 'requirements.txt');
 
   if (fsFiles[requirementsTxt]) {

packages/now-python/test/fixtures/04-cowsay-pipfile/Pipfile

@@ -0,0 +1,12 @@
+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+
+[packages]
+cowpy = "*"
+
+[requires]
+python_version = "3.7"

packages/now-python/test/fixtures/04-cowsay-pipfile/Pipfile.lock

@@ -0,0 +1,29 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "841b49dd1836f7373490faa2a1d6abb4ecd53c0b45e8196df7c6e852e21f458b"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "3.7"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "cowpy": {
+            "hashes": [
+                "sha256:1bdc61d107df02fd34a9241f2220d0704a01d8ce16bed8bff3512a34a0efa56a",
+                "sha256:91a861bfbfa644dfdba5b2250d141b2227a94f61d4dcbeaf7653524d048935a9"
+            ],
+            "index": "pypi",
+            "version": "==1.1.0"
+        }
+    },
+    "develop": {}
+}

packages/now-python/test/fixtures/04-cowsay-pipfile/index.py

@@ -0,0 +1,13 @@
+from http.server import BaseHTTPRequestHandler
+from cowpy import cow
+
+
+class handler(BaseHTTPRequestHandler):
+
+    def do_GET(self):
+        self.send_response(200)
+        self.send_header('Content-type', 'text/plain')
+        self.end_headers()
+        message = cow.Cowacter().milk('pip:RANDOMNESS_PLACEHOLDER')
+        self.wfile.write(message.encode())
+        return

packages/now-python/test/fixtures/04-cowsay-pipfile/now.json

@@ -0,0 +1,5 @@
+{
+  "version": 2,
+  "builds": [{ "src": "**/**.py", "use": "@now/python" }],
+  "probes": [{ "path": "/", "mustContain": "pip:RANDOMNESS_PLACEHOLDER" }]
+}

packages/now-python/test/fixtures/05-cowsay-pipfile-local/local/Pipfile

@@ -0,0 +1,12 @@
+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+
+[packages]
+cowpy = "*"
+
+[requires]
+python_version = "3.7"

packages/now-python/test/fixtures/05-cowsay-pipfile-local/local/Pipfile.lock

@@ -0,0 +1,29 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "841b49dd1836f7373490faa2a1d6abb4ecd53c0b45e8196df7c6e852e21f458b"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "3.7"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "cowpy": {
+            "hashes": [
+                "sha256:1bdc61d107df02fd34a9241f2220d0704a01d8ce16bed8bff3512a34a0efa56a",
+                "sha256:91a861bfbfa644dfdba5b2250d141b2227a94f61d4dcbeaf7653524d048935a9"
+            ],
+            "index": "pypi",
+            "version": "==1.1.0"
+        }
+    },
+    "develop": {}
+}

packages/now-python/test/fixtures/05-cowsay-pipfile-local/local/index.py

@@ -0,0 +1,13 @@
+from http.server import BaseHTTPRequestHandler
+from cowpy import cow
+
+
+class handler(BaseHTTPRequestHandler):
+
+    def do_GET(self):
+        self.send_response(200)
+        self.send_header('Content-type', 'text/plain')
+        self.end_headers()
+        message = cow.Cowacter().milk('pip:RANDOMNESS_PLACEHOLDER')
+        self.wfile.write(message.encode())
+        return

packages/now-python/test/fixtures/05-cowsay-pipfile-local/now.json

@@ -0,0 +1,5 @@
+{
+  "version": 2,
+  "builds": [{ "src": "**/**.py", "use": "@now/python" }],
+  "probes": [{ "path": "/local", "mustContain": "pip:RANDOMNESS_PLACEHOLDER" }]
+}

packages/now-python/test/fixtures/09-url-params/now.json

@@ -4,6 +4,9 @@
   "routes": [{ "src": "/another", "dest": "custom.py" }],
   "probes": [
     { "path": "/?hello=/", "mustContain": "path:  query: {'hello': '/'}" },
-    { "path": "/another?hello=/", "mustContain": "path: another query: {'hello': '/'}" }
+    {
+      "path": "/another?hello=/",
+      "mustContain": "path: another query: {'hello': '/'}"
+    }
   ]
 }

packages/now-python/test/fixtures/11-asgi/Pipfile

@@ -0,0 +1,12 @@
+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+
+[packages]
+sanic = "*"
+
+[requires]
+python_version = "3.6"

packages/now-python/test/fixtures/11-asgi/Pipfile.lock

@@ -0,0 +1,207 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "93dcd591e5690d3a71cb02979cbe317e83e3c03ec020867bf1554a480ef5cd8a"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "3.6"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "aiofiles": {
+            "hashes": [
+                "sha256:021ea0ba314a86027c166ecc4b4c07f2d40fc0f4b3a950d1868a0f2571c2bbee",
+                "sha256:1e644c2573f953664368de28d2aa4c89dfd64550429d0c27c4680ccd3aa4985d"
+            ],
+            "version": "==0.4.0"
+        },
+        "certifi": {
+            "hashes": [
+                "sha256:046832c04d4e752f37383b628bc601a7ea7211496b4638f6514d0e5b9acc4939",
+                "sha256:945e3ba63a0b9f577b1395204e13c3a231f9bc0223888be653286534e5873695"
+            ],
+            "version": "==2019.6.16"
+        },
+        "chardet": {
+            "hashes": [
+                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
+                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
+            ],
+            "version": "==3.0.4"
+        },
+        "h11": {
+            "hashes": [
+                "sha256:acca6a44cb52a32ab442b1779adf0875c443c689e9e028f8d831a3769f9c5208",
+                "sha256:f2b1ca39bfed357d1f19ac732913d5f9faa54a5062eca7d2ec3a916cfb7ae4c7"
+            ],
+            "version": "==0.8.1"
+        },
+        "h2": {
+            "hashes": [
+                "sha256:c8f387e0e4878904d4978cd688a3195f6b169d49b1ffa572a3d347d7adc5e09f",
+                "sha256:fd07e865a3272ac6ef195d8904de92dc7b38dc28297ec39cfa22716b6d62e6eb"
+            ],
+            "version": "==3.1.0"
+        },
+        "hpack": {
+            "hashes": [
+                "sha256:0edd79eda27a53ba5be2dfabf3b15780928a0dff6eb0c60a3d6767720e970c89",
+                "sha256:8eec9c1f4bfae3408a3f30500261f7e6a65912dc138526ea054f9ad98892e9d2"
+            ],
+            "version": "==3.0.0"
+        },
+        "httpcore": {
+            "hashes": [
+                "sha256:96f910b528d47b683242ec207050c7bbaa99cd1b9a07f78ea80cf61e55556b58"
+            ],
+            "version": "==0.3.0"
+        },
+        "httptools": {
+            "hashes": [
+                "sha256:e00cbd7ba01ff748e494248183abc6e153f49181169d8a3d41bb49132ca01dfc"
+            ],
+            "version": "==0.0.13"
+        },
+        "hyperframe": {
+            "hashes": [
+                "sha256:5187962cb16dcc078f23cb5a4b110098d546c3f41ff2d4038a9896893bbd0b40",
+                "sha256:a9f5c17f2cc3c719b917c4f33ed1c61bd1f8dfac4b1bd23b7c80b3400971b41f"
+            ],
+            "version": "==5.2.0"
+        },
+        "idna": {
+            "hashes": [
+                "sha256:c357b3f628cf53ae2c4c05627ecc484553142ca23264e593d327bcde5e9c3407",
+                "sha256:ea8b7f6188e6fa117537c3df7da9fc686d485087abf6ac197f9c46432f7e4a3c"
+            ],
+            "version": "==2.8"
+        },
+        "multidict": {
+            "hashes": [
+                "sha256:024b8129695a952ebd93373e45b5d341dbb87c17ce49637b34000093f243dd4f",
+                "sha256:041e9442b11409be5e4fc8b6a97e4bcead758ab1e11768d1e69160bdde18acc3",
+                "sha256:045b4dd0e5f6121e6f314d81759abd2c257db4634260abcfe0d3f7083c4908ef",
+                "sha256:047c0a04e382ef8bd74b0de01407e8d8632d7d1b4db6f2561106af812a68741b",
+                "sha256:068167c2d7bbeebd359665ac4fff756be5ffac9cda02375b5c5a7c4777038e73",
+                "sha256:148ff60e0fffa2f5fad2eb25aae7bef23d8f3b8bdaf947a65cdbe84a978092bc",
+                "sha256:1d1c77013a259971a72ddaa83b9f42c80a93ff12df6a4723be99d858fa30bee3",
+                "sha256:1d48bc124a6b7a55006d97917f695effa9725d05abe8ee78fd60d6588b8344cd",
+                "sha256:31dfa2fc323097f8ad7acd41aa38d7c614dd1960ac6681745b6da124093dc351",
+                "sha256:34f82db7f80c49f38b032c5abb605c458bac997a6c3142e0d6c130be6fb2b941",
+                "sha256:3d5dd8e5998fb4ace04789d1d008e2bb532de501218519d70bb672c4c5a2fc5d",
+                "sha256:4a6ae52bd3ee41ee0f3acf4c60ceb3f44e0e3bc52ab7da1c2b2aa6703363a3d1",
+                "sha256:4b02a3b2a2f01d0490dd39321c74273fed0568568ea0e7ea23e02bd1fb10a10b",
+                "sha256:4b843f8e1dd6a3195679d9838eb4670222e8b8d01bc36c9894d6c3538316fa0a",
+                "sha256:5de53a28f40ef3c4fd57aeab6b590c2c663de87a5af76136ced519923d3efbb3",
+                "sha256:61b2b33ede821b94fa99ce0b09c9ece049c7067a33b279f343adfe35108a4ea7",
+                "sha256:6a3a9b0f45fd75dc05d8e93dc21b18fc1670135ec9544d1ad4acbcf6b86781d0",
+                "sha256:76ad8e4c69dadbb31bad17c16baee61c0d1a4a73bed2590b741b2e1a46d3edd0",
+                "sha256:7ba19b777dc00194d1b473180d4ca89a054dd18de27d0ee2e42a103ec9b7d014",
+                "sha256:7c1b7eab7a49aa96f3db1f716f0113a8a2e93c7375dd3d5d21c4941f1405c9c5",
+                "sha256:7fc0eee3046041387cbace9314926aa48b681202f8897f8bff3809967a049036",
+                "sha256:8ccd1c5fff1aa1427100ce188557fc31f1e0a383ad8ec42c559aabd4ff08802d",
+                "sha256:8e08dd76de80539d613654915a2f5196dbccc67448df291e69a88712ea21e24a",
+                "sha256:c18498c50c59263841862ea0501da9f2b3659c00db54abfbf823a80787fde8ce",
+                "sha256:c49db89d602c24928e68c0d510f4fcf8989d77defd01c973d6cbe27e684833b1",
+                "sha256:ce20044d0317649ddbb4e54dab3c1bcc7483c78c27d3f58ab3d0c7e6bc60d26a",
+                "sha256:d1071414dd06ca2eafa90c85a079169bfeb0e5f57fd0b45d44c092546fcd6fd9",
+                "sha256:d3be11ac43ab1a3e979dac80843b42226d5d3cccd3986f2e03152720a4297cd7",
+                "sha256:db603a1c235d110c860d5f39988ebc8218ee028f07a7cbc056ba6424372ca31b"
+            ],
+            "version": "==4.5.2"
+        },
+        "requests": {
+            "hashes": [
+                "sha256:11e007a8a2aa0323f5a921e9e6a2d7e4e67d9877e85773fba9ba6419025cbeb4",
+                "sha256:9cf5292fcd0f598c671cfc1e0d7d1a7f13bb8085e9a590f48c010551dc6c4b31"
+            ],
+            "version": "==2.22.0"
+        },
+        "requests-async": {
+            "hashes": [
+                "sha256:8731420451383196ecf2fd96082bfc8ae5103ada90aba185888499d7784dde6f"
+            ],
+            "version": "==0.5.0"
+        },
+        "rfc3986": {
+            "hashes": [
+                "sha256:0344d0bd428126ce554e7ca2b61787b6a28d2bbd19fc70ed2dd85efe31176405",
+                "sha256:df4eba676077cefb86450c8f60121b9ae04b94f65f85b69f3f731af0516b7b18"
+            ],
+            "version": "==1.3.2"
+        },
+        "sanic": {
+            "hashes": [
+                "sha256:cc64978266025afb0e7c0f8be928e2b81670c5d58ddac290d04c9d0da6ec2112",
+                "sha256:ebd806298782400db811ea9d63e8096e835e67f0b5dc5e66e507532984a82bb3"
+            ],
+            "index": "pypi",
+            "version": "==19.6.0"
+        },
+        "ujson": {
+            "hashes": [
+                "sha256:f66073e5506e91d204ab0c614a148d5aa938bdbf104751be66f8ad7a222f5f86"
+            ],
+            "markers": "sys_platform != 'win32' and implementation_name == 'cpython'",
+            "version": "==1.35"
+        },
+        "urllib3": {
+            "hashes": [
+                "sha256:b246607a25ac80bedac05c6f282e3cdaf3afb65420fd024ac94435cabe6e18d1",
+                "sha256:dbe59173209418ae49d485b87d1681aefa36252ee85884c31346debd19463232"
+            ],
+            "version": "==1.25.3"
+        },
+        "uvloop": {
+            "hashes": [
+                "sha256:0fcd894f6fc3226a962ee7ad895c4f52e3f5c3c55098e21efb17c071849a0573",
+                "sha256:2f31de1742c059c96cb76b91c5275b22b22b965c886ee1fced093fa27dde9e64",
+                "sha256:459e4649fcd5ff719523de33964aa284898e55df62761e7773d088823ccbd3e0",
+                "sha256:67867aafd6e0bc2c30a079603a85d83b94f23c5593b3cc08ec7e58ac18bf48e5",
+                "sha256:8c200457e6847f28d8bb91c5e5039d301716f5f2fce25646f5fb3fd65eda4a26",
+                "sha256:958906b9ca39eb158414fbb7d6b8ef1b7aee4db5c8e8e5d00fcbb69a1ce9dca7",
+                "sha256:ac1dca3d8f3ef52806059e81042ee397ac939e5a86c8a3cea55d6b087db66115",
+                "sha256:b284c22d8938866318e3b9d178142b8be316c52d16fcfe1560685a686718a021",
+                "sha256:c48692bf4587ce281d641087658eca275a5ad3b63c78297bbded96570ae9ce8f",
+                "sha256:fefc3b2b947c99737c348887db2c32e539160dcbeb7af9aa6b53db7a283538fe"
+            ],
+            "markers": "sys_platform != 'win32' and implementation_name == 'cpython'",
+            "version": "==0.12.2"
+        },
+        "websockets": {
+            "hashes": [
+                "sha256:0e2f7d6567838369af074f0ef4d0b802d19fa1fee135d864acc656ceefa33136",
+                "sha256:2a16dac282b2fdae75178d0ed3d5b9bc3258dabfae50196cbb30578d84b6f6a6",
+                "sha256:5a1fa6072405648cb5b3688e9ed3b94be683ce4a4e5723e6f5d34859dee495c1",
+                "sha256:5c1f55a1274df9d6a37553fef8cff2958515438c58920897675c9bc70f5a0538",
+                "sha256:669d1e46f165e0ad152ed8197f7edead22854a6c90419f544e0f234cc9dac6c4",
+                "sha256:695e34c4dbea18d09ab2c258994a8bf6a09564e762655408241f6a14592d2908",
+                "sha256:6b2e03d69afa8d20253455e67b64de1a82ff8612db105113cccec35d3f8429f0",
+                "sha256:79ca7cdda7ad4e3663ea3c43bfa8637fc5d5604c7737f19a8964781abbd1148d",
+                "sha256:7fd2dd9a856f72e6ed06f82facfce01d119b88457cd4b47b7ae501e8e11eba9c",
+                "sha256:82c0354ac39379d836719a77ee360ef865377aa6fdead87909d50248d0f05f4d",
+                "sha256:8f3b956d11c5b301206382726210dc1d3bee1a9ccf7aadf895aaf31f71c3716c",
+                "sha256:91ec98640220ae05b34b79ee88abf27f97ef7c61cf525eec57ea8fcea9f7dddb",
+                "sha256:952be9540d83dba815569d5cb5f31708801e0bbfc3a8c5aef1890b57ed7e58bf",
+                "sha256:99ac266af38ba1b1fe13975aea01ac0e14bb5f3a3200d2c69f05385768b8568e",
+                "sha256:9fa122e7adb24232247f8a89f2d9070bf64b7869daf93ac5e19546b409e47e96",
+                "sha256:a0873eadc4b8ca93e2e848d490809e0123eea154aa44ecd0109c4d0171869584",
+                "sha256:cb998bd4d93af46b8b49ecf5a72c0a98e5cc6d57fdca6527ba78ad89d6606484",
+                "sha256:e02e57346f6a68523e3c43bbdf35dde5c440318d1f827208ae455f6a2ace446d",
+                "sha256:e79a5a896bcee7fff24a788d72e5c69f13e61369d055f28113e71945a7eb1559",
+                "sha256:ee55eb6bcf23ecc975e6b47c127c201b913598f38b6a300075f84eeef2d3baff",
+                "sha256:f1414e6cbcea8d22843e7eafdfdfae3dd1aba41d1945f6ca66e4806c07c4f454"
+            ],
+            "version": "==6.0"
+        }
+    },
+    "develop": {}
+}

packages/now-python/test/fixtures/11-asgi/index.py

@@ -0,0 +1,8 @@
+from sanic import Sanic
+from sanic import response
+app = Sanic()
+
+
+@app.route("/")
+async def index(request):
+    return response.text("asgi:RANDOMNESS_PLACEHOLDER")

packages/now-python/test/fixtures/11-asgi/now.json

@@ -0,0 +1,11 @@
+{
+  "version": 2,
+  "builds": [
+    {
+      "src": "index.py",
+      "use": "@now/python",
+      "config": { "maxLambdaSize": "10mb" }
+    }
+  ],
+  "probes": [{ "path": "/", "mustContain": "asgi:RANDOMNESS_PLACEHOLDER" }]
+}

packages/now-ruby/.gitignore

@@ -0,0 +1 @@
+/dist

packages/now-ruby/index.ts

@@ -0,0 +1,220 @@
+import { join, dirname } from 'path';
+import execa from 'execa';
+import {
+  ensureDir,
+  move,
+  remove,
+  pathExists,
+  readFile,
+  writeFile,
+} from 'fs-extra';
+import {
+  download,
+  getWriteableDirectory,
+  glob,
+  createLambda,
+  BuildOptions,
+} from '@now/build-utils';
+import { installBundler } from './install-ruby';
+
+const REQUIRED_VENDOR_DIR = 'vendor/bundle/ruby/2.5.0';
+
+async function matchPaths(
+  configPatterns: string | string[] | undefined,
+  workPath: string
+) {
+  const patterns =
+    typeof configPatterns === 'string' ? [configPatterns] : configPatterns;
+
+  if (!patterns) {
+    return [];
+  }
+
+  const patternPaths = await Promise.all(
+    patterns.map(async pattern => {
+      const files = await glob(pattern, workPath);
+      return Object.keys(files);
+    })
+  );
+
+  return patternPaths.reduce((a, b) => a.concat(b), []);
+}
+
+async function bundleInstall(
+  bundlePath: string,
+  bundleDir: string,
+  gemfilePath: string
+) {
+  console.log(`running "bundle install --deployment"...`);
+  const bundleAppConfig = await getWriteableDirectory();
+
+  try {
+    await execa(
+      bundlePath,
+      [
+        'install',
+        '--deployment',
+        '--gemfile',
+        gemfilePath,
+        '--path',
+        bundleDir,
+      ],
+      {
+        stdio: 'inherit',
+        env: {
+          BUNDLE_SILENCE_ROOT_WARNING: '1',
+          BUNDLE_APP_CONFIG: bundleAppConfig,
+        },
+      }
+    );
+  } catch (err) {
+    console.log(`failed to run "bundle install --deployment"...`);
+    throw err;
+  }
+}
+
+export const config = {
+  maxLambdaSize: '5mb',
+};
+
+export const build = async ({
+  workPath,
+  files,
+  entrypoint,
+  config,
+}: BuildOptions) => {
+  console.log('downloading files...');
+
+  // eslint-disable-next-line no-param-reassign
+  files = await download(files, workPath);
+
+  const { gemHome, bundlerPath } = await installBundler();
+  process.env.GEM_HOME = gemHome;
+
+  const fsFiles = await glob('**', workPath);
+  const entryDirectory = dirname(entrypoint);
+  const fsEntryDirectory = dirname(fsFiles[entrypoint].fsPath);
+
+  // check for an existing vendor directory
+  console.log(
+    'checking for existing vendor directory at',
+    '"' + REQUIRED_VENDOR_DIR + '"'
+  );
+  const vendorDir = join(workPath, REQUIRED_VENDOR_DIR);
+  const bundleDir = join(workPath, 'vendor/bundle');
+  const relativeVendorDir = join(fsEntryDirectory, REQUIRED_VENDOR_DIR);
+
+  let hasRootVendorDir = await pathExists(vendorDir);
+  let hasRelativeVendorDir = await pathExists(relativeVendorDir);
+  let hasVendorDir = hasRootVendorDir || hasRelativeVendorDir;
+
+  if (hasRelativeVendorDir) {
+    if (hasRootVendorDir) {
+      console.log(
+        'found two vendor directories, choosing the vendor directory relative to entrypoint'
+      );
+    } else {
+      console.log('found vendor directory relative to entrypoint');
+    }
+
+    // vendor dir must be at the root for lambda to find it
+    await move(relativeVendorDir, vendorDir);
+  } else if (hasRootVendorDir) {
+    console.log('found vendor directory in project root');
+  }
+
+  await ensureDir(vendorDir);
+
+  // no vendor directory, check for Gemfile to install
+  if (!hasVendorDir) {
+    const gemFile = join(entryDirectory, 'Gemfile');
+
+    if (fsFiles[gemFile]) {
+      console.log(
+        'did not find a vendor directory but found a Gemfile, bundling gems...'
+      );
+      const gemfilePath = fsFiles[gemFile].fsPath;
+
+      // try installing. this won't work if native extesions are required.
+      // if that's the case, gems should be vendored locally before deploying.
+      try {
+        await bundleInstall(bundlerPath, bundleDir, gemfilePath);
+      } catch (err) {
+        console.log(
+          'unable to build gems from Gemfile. vendor the gems locally with "bundle install --deployment" and retry.'
+        );
+        throw err;
+      }
+    }
+  } else {
+    console.log('found vendor directory, skipping "bundle install"...');
+  }
+
+  // try to remove gem cache to slim bundle size
+  try {
+    await remove(join(vendorDir, 'cache'));
+  } catch (e) {}
+
+  const originalRbPath = join(__dirname, '..', 'now_init.rb');
+  const originalNowHandlerRbContents = await readFile(originalRbPath, 'utf8');
+
+  // will be used on `require_relative '$here'` or for loading rack config.ru file
+  // for example, `require_relative 'api/users'`
+  console.log('entrypoint is', entrypoint);
+  const userHandlerFilePath = entrypoint.replace(/\.rb$/, '');
+  const nowHandlerRbContents = originalNowHandlerRbContents.replace(
+    /__NOW_HANDLER_FILENAME/g,
+    userHandlerFilePath
+  );
+
+  // in order to allow the user to have `server.rb`, we need our `server.rb` to be called
+  // somethig else
+  const nowHandlerRbFilename = 'now__handler__ruby';
+
+  await writeFile(
+    join(workPath, `${nowHandlerRbFilename}.rb`),
+    nowHandlerRbContents
+  );
+
+  const outputFiles = await glob('**', workPath);
+
+  // static analysis is impossible with ruby.
+  // instead, provide `includeFiles` and `excludeFiles` config options to reduce bundle size.
+  if (config && (config.includeFiles || config.excludeFiles)) {
+    const includedPaths = await matchPaths(config.includeFiles, workPath);
+    const excludedPaths = await matchPaths(
+      <string | string[]>config.excludeFiles,
+      workPath
+    );
+
+    for (let i = 0; i < excludedPaths.length; i++) {
+      // whitelist includeFiles
+      if (includedPaths.includes(excludedPaths[i])) {
+        continue;
+      }
+
+      // whitelist handler
+      if (excludedPaths[i] === `${nowHandlerRbFilename}.rb`) {
+        continue;
+      }
+
+      // whitelist vendor directory
+      if (excludedPaths[i].startsWith(REQUIRED_VENDOR_DIR)) {
+        continue;
+      }
+
+      delete outputFiles[excludedPaths[i]];
+    }
+  }
+
+  const lambda = await createLambda({
+    files: outputFiles,
+    handler: `${nowHandlerRbFilename}.now__handler`,
+    runtime: 'ruby2.5',
+    environment: {},
+  });
+
+  return {
+    [entrypoint]: lambda,
+  };
+};

packages/now-ruby/install-ruby.ts

@@ -0,0 +1,66 @@
+import { join } from 'path';
+import execa from 'execa';
+import { getWriteableDirectory } from '@now/build-utils';
+
+const RUBY_VERSION = '2.5.3';
+
+async function installRuby(version: string = RUBY_VERSION) {
+  const baseDir = await getWriteableDirectory();
+  const rubyDir = join(baseDir, 'ruby');
+  const rubyBuildDir = join(baseDir, 'ruby-build');
+
+  await execa(
+    'yum',
+    [
+      'install',
+      '-y',
+      'git',
+      'gcc',
+      'make',
+      'tar',
+      'bzip2',
+      'readline-devel',
+      'openssl-devel',
+      'ruby-devel',
+      'zlib-devel',
+    ],
+    { stdio: 'inherit' }
+  );
+  await execa(
+    'git',
+    ['clone', 'git://github.com/rbenv/ruby-build.git', rubyBuildDir],
+    { stdio: 'inherit' }
+  );
+  await execa(join(rubyBuildDir, 'bin', 'ruby-build'), [version, rubyDir], {
+    stdio: 'inherit',
+  });
+
+  return {
+    gemHome: rubyDir,
+    rubyPath: join(rubyDir, 'bin', 'ruby'),
+    gemPath: join(rubyDir, 'bin', 'gem'),
+  };
+}
+
+// downloads and installs `bundler` (respecting
+// process.env.GEM_HOME), and returns
+// the absolute path to it
+export async function installBundler() {
+  console.log('installing ruby...');
+  const { gemHome, rubyPath, gemPath } = await installRuby();
+
+  console.log('installing bundler...');
+  await execa(gemPath, ['install', 'bundler', '--no-document'], {
+    stdio: 'inherit',
+    env: {
+      GEM_HOME: gemHome,
+    },
+  });
+
+  return {
+    gemHome,
+    rubyPath,
+    gemPath,
+    bundlerPath: join(gemHome, 'bin', 'bundler'),
+  };
+}

packages/now-ruby/now_init.rb

@@ -0,0 +1,87 @@
+require 'tmpdir'
+require 'webrick'
+require 'net/http'
+require 'base64'
+require 'json'
+
+$entrypoint = '__NOW_HANDLER_FILENAME'
+
+ENV['RAILS_ENV'] ||= 'production'
+ENV['RAILS_LOG_TO_STDOUT'] ||= '1'
+
+def rack_handler(httpMethod, path, body, headers)
+  require 'rack'
+
+  app, _ = Rack::Builder.parse_file($entrypoint)
+  server = Rack::MockRequest.new app
+
+  env = headers.transform_keys { |k| k.split('-').join('_').prepend('HTTP_').upcase }
+  res = server.request(httpMethod, path, env.merge({ :input => body }))
+
+  {
+    :statusCode => res.status,
+    :headers => res.original_headers,
+    :body => res.body,
+  }
+end
+
+def webrick_handler(httpMethod, path, body, headers)
+  require_relative $entrypoint
+
+  if not Object.const_defined?('Handler')
+    return { :statusCode => 500, :body => 'Handler not defined in lambda' }
+  end
+
+  host = '0.0.0.0'
+  port = 3000
+
+  server = WEBrick::HTTPServer.new :BindAddress => host, :Port => port
+
+  if Handler.is_a?(Proc)
+    server.mount_proc '/', Handler
+  else
+    server.mount '/', Handler
+  end
+
+  th = Thread.new(server) do |server|
+    server.start
+  end
+
+  http = Net::HTTP.new(host, port)
+  res = http.send_request(httpMethod, path, body, headers)
+
+  Signal.list.keys.each do |sig|
+    begin
+      Signal.trap(sig, cleanup)
+    rescue
+    end
+  end
+
+  server.shutdown
+  Thread.kill(th)
+
+  {
+    :statusCode => res.code.to_i,
+    :headers => res.each_capitalized.to_h,
+    :body => res.body,
+  }
+end
+
+def now__handler(event:, context:)
+  payload = JSON.parse(event['body'])
+  path = payload['path']
+  headers = payload['headers']
+  httpMethod = payload['method']
+  encoding = payload['encoding']
+  body = payload['body']
+
+  if (not body.nil? and not body.empty?) and (not encoding.nil? and encoding == 'base64')
+    body = Base64.decode64(body)
+  end
+
+  if $entrypoint.end_with? '.ru'
+    return rack_handler(httpMethod, path, body, headers)
+  end
+
+  return webrick_handler(httpMethod, path, body, headers)
+end

packages/now-ruby/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "@now/ruby",
+  "author": "Nathan Cahill <nathan@nathancahill.com>",
+  "version": "0.1.1",
+  "license": "MIT",
+  "main": "./dist/index",
+  "files": [
+    "dist",
+    "now_init.rb"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/zeit/now-builders.git",
+    "directory": "packages/now-ruby"
+  },
+  "scripts": {
+    "build": "tsc",
+    "test": "tsc && jest",
+    "prepublishOnly": "tsc"
+  },
+  "dependencies": {
+    "execa": "^1.0.0",
+    "fs-extra": "^7.0.1"
+  },
+  "devDependencies": {
+    "typescript": "3.5.2"
+  }
+}

packages/now-ruby/test/fixtures/01-cowsay/Gemfile

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "cowsay", "~> 0.3.0"

packages/now-ruby/test/fixtures/01-cowsay/Gemfile.lock

@@ -0,0 +1,13 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    cowsay (0.3.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  cowsay (~> 0.3.0)
+
+BUNDLED WITH
+   2.0.1

packages/now-ruby/test/fixtures/01-cowsay/index.rb

@@ -0,0 +1,10 @@
+require 'webrick'
+require 'cowsay'
+
+class Handler < WEBrick::HTTPServlet::AbstractServlet
+  def do_GET req, res
+    res.status = 200
+    res['Content-Type'] = 'text/plain'
+    res.body = Cowsay.say('gem:RANDOMNESS_PLACEHOLDER', 'cow')
+  end
+end

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

@@ -0,0 +1,5 @@
+{
+  "version": 2,
+  "builds": [{ "src": "index.rb", "use": "@now/ruby" }],
+  "probes": [{ "path": "/", "mustContain": "gem:RANDOMNESS_PLACEHOLDER" }]
+}

packages/now-ruby/test/fixtures/02-cowsay-vendored/index.rb

@@ -0,0 +1,10 @@
+require 'webrick'
+require 'cowsay'
+
+class Handler < WEBrick::HTTPServlet::AbstractServlet
+  def do_GET req, res
+    res.status = 200
+    res['Content-Type'] = 'text/plain'
+    res.body = Cowsay.say('gem:RANDOMNESS_PLACEHOLDER', 'cow')
+  end
+end

packages/now-ruby/test/fixtures/02-cowsay-vendored/now.json

@@ -0,0 +1,5 @@
+{
+  "version": 2,
+  "builds": [{ "src": "index.rb", "use": "@now/ruby" }],
+  "probes": [{ "path": "/", "mustContain": "gem:RANDOMNESS_PLACEHOLDER" }]
+}

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/bin/cowsay

@@ -0,0 +1,27 @@
+#!/usr/bin/env ruby
+#
+# This file was generated by RubyGems.
+#
+# The application 'cowsay' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require 'rubygems'
+
+version = ">= 0.a"
+
+str = ARGV.first
+if str
+  str = str.b[/\A_(.*)_\z/, 1]
+  if str and Gem::Version.correct?(str)
+    version = str
+    ARGV.shift
+  end
+end
+
+if Gem.respond_to?(:activate_bin_path)
+load Gem.activate_bin_path('cowsay', 'cowsay', version)
+else
+gem "cowsay", version
+load Gem.bin_path("cowsay", "cowsay", version)
+end

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/.gitignore

@@ -0,0 +1,20 @@
+*.gem
+*.rbc
+*.swp
+.DS_Store
+.bundle
+.config
+.vagrant
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc/
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/Gemfile

@@ -0,0 +1,4 @@
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in zerobuf.gemspec
+gemspec

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/LICENSE.txt

@@ -0,0 +1,23 @@
+Copyright 2012 MoneyDesktop Inc.
+Copyright Cowsay contributors https://github.com/moneydesktop/cowsay/contributors
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/README.md

@@ -0,0 +1,21 @@
+# Cowsay
+
+ASCII art avatars emote your messages
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+    gem install cowsay
+
+And then execute:
+
+    $ cowsay 'Hello world!'
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/Rakefile

@@ -0,0 +1 @@
+require 'bundler/gem_tasks'

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/bin/cowsay

@@ -0,0 +1,28 @@
+#!/usr/bin/env ruby
+
+require 'cowsay'
+require 'optparse'
+
+options = {}
+OptionParser.new do |opts|
+  opts.banner = "Usage: cowsay [-h] [-f cowfile] [-l] [message]"
+  opts.on("-l", "List available cow files") do |cowfile|
+    options['list'] = true
+  end
+  opts.on("-f COWFILE", "Specify a cow file") do |cowfile|
+    options['cowfile'] = cowfile
+  end
+end.parse!
+
+if options['list']
+  puts "Cow files:"
+  puts Cowsay.character_classes.join(' ') 
+else
+  if ARGV.any?
+    message = ARGV.join(' ')
+  else
+    #retrieve any piped input, otherwise use the empty string.
+    message = STDIN.tty? ? '' : ARGF.read.chomp
+  end
+  puts Cowsay.say(message, options['cowfile'])
+end

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/cowsay.gemspec

@@ -0,0 +1,22 @@
+# -*- encoding: utf-8 -*-
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'cowsay/version'
+
+Gem::Specification.new do |gem|
+  gem.name          = 'cowsay'
+  gem.version       = Cowsay::VERSION
+  gem.authors       = ['JohnnyT']
+  gem.email         = ['johnnyt@moneydesktop.com']
+  gem.description   = %q{ASCII art avatars emote your messages}
+  gem.summary       = gem.description
+  gem.homepage      = 'https://github.com/moneydesktop/cowsay'
+
+  gem.files         = `git ls-files`.split($/)
+  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
+  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
+  gem.require_paths = ['lib']
+
+  gem.add_development_dependency 'rake'
+  # gem.add_development_dependency 'rspec-pride'
+end

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/lib/cowsay.rb

@@ -0,0 +1,28 @@
+require 'cowsay/version'
+require 'cowsay/character'
+
+module ::Cowsay
+  module_function # all instance methods are available on the module (class) level
+
+  def random_character
+    random_class = Character.const_get(character_classes[rand(character_classes.length)])
+    random_class.new
+  end
+
+  def character_classes
+    @character_classes ||= Character.constants.map { |c| c.to_sym } - [:Base, :Template]
+  end
+
+  def say(message, character)
+    character ||= 'cow'
+    if character == 'random'
+      random_character.say(message)
+    else
+      if character_classes.include? character.capitalize.to_sym
+        Character.const_get(character.capitalize).say(message)
+      else
+        puts "No cow file found for #{character}. Use the -l flag to see a list of available cow files."
+      end
+    end
+  end
+end

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/lib/cowsay/character.rb

@@ -0,0 +1,9 @@
+module Cowsay
+  module Character
+    autoload :Base,   'cowsay/character/base'
+  end
+end
+
+Dir[File.expand_path('character/*.rb', File.dirname(__FILE__))].each do |character|
+  require character
+end

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/lib/cowsay/character/base.rb

@@ -0,0 +1,73 @@
+module Cowsay
+  module Character
+
+    class Base
+      MAX_LINE_LENGTH = 36 unless defined?(MAX_LINE_LENGTH)
+
+      def self.say(message)
+        new.say(message)
+      end
+
+      def initialize
+        @thoughts = '\\'
+      end
+
+      def say(message)
+        render_balloon(message) + render_character
+      end
+
+      def template
+        raise '#template should be subclassed'
+      end
+
+      private
+
+      def render_character
+        template
+      end
+
+      def render_balloon(message)
+        message_lines = format_message(message)
+        line_length = message_lines.max{ |a,b| a.length <=> b.length }.length
+
+        output_lines = []
+
+        output_lines << " #{'_' * (line_length + 2)} "
+
+        message_lines.each do |line|
+          # 'Here is your message: %s' % 'hello world'
+          # is the same as
+          # printf('Here is your message: %s', 'hello world')
+          output_lines << "| %-#{line_length}s |" % line
+        end
+
+        output_lines << " #{'-' * (line_length + 2)} "
+        output_lines << ''
+
+        output_lines.join("\n")
+      end
+
+      def format_message(message)
+        return [message] if message.length <= MAX_LINE_LENGTH
+
+        lines = []
+        words = message.split(/\s/).reject{ |word| word.length.zero? }
+        new_line = ''
+
+        words.each do |word|
+          new_line << "#{word} "
+
+          if new_line.length > MAX_LINE_LENGTH
+            lines << new_line.chomp
+            new_line = ''
+          end
+        end
+
+        lines << new_line.chomp unless new_line.length.zero?
+
+        lines
+      end
+    end
+
+  end
+end

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/lib/cowsay/character/beavis.rb

@@ -0,0 +1,31 @@
+module Cowsay
+  module Character
+
+    class Beavis < Base
+      def template
+        <<-TEMPLATE
+   #{@thoughts}         __------~~-,
+    #{@thoughts}      ,'            ,
+          /               \\
+         /                :
+        |                  '
+        |                  |
+        |                  |
+         |   _--           |
+         _| =-.     .-.   ||
+         o|/o/       _.   |
+         /  ~          \\ |
+       (____\@)  ___~    |
+          |_===~~~.`    |
+       _______.--~     |
+       \\________       |
+                \\      |
+              __/-___-- -__
+             /            _ \\
+
+        TEMPLATE
+      end
+    end
+
+  end
+end

packages/now-ruby/test/fixtures/02-cowsay-vendored/vendor/bundle/ruby/2.5.0/gems/cowsay-0.3.0/lib/cowsay/character/bunny.rb

@@ -0,0 +1,17 @@
+module Cowsay
+  module Character
+
+    class Bunny < Base
+      def template
+        <<-TEMPLATE
+  #{@thoughts}
+   #{@thoughts}   \\
+        \\ /\\
+        ( )
+      .( o ).
+        TEMPLATE
+      end
+    end
+
+  end
+end