This is an extension to the Runtime API, where a runtime can optionally define a `startDevServer()` function which is responsible for spawning a single-serve dev server for an individual HTTP request (the dev server is booted up upon receiving an HTTP request, and gets shut down by `now dev` after the HTTP request is completed). For runtimes that define this function, the `build()` function will never be executed, which avoids a lot of unnecessary processing for a dev environment.
Some things this accomplishes:
* Retains the proper stack trace for errors.
* Ensures that if a source code file is changed, and then an HTTP request is sent, it's guaranteed to be using the latest code (no file watching, or re-compilations).
* Avoids creating a Lambda zip file (just to immediately unpack it for dev).
* Avoids `@zeit/fun` completely, which loses some "correctness" (i.e. function is not frozen in between requests).
* Backwards compatible with older Now CLIs - versions that don't know about `startDevServer()` will just invoke `build()`, and there's no version change required in the Runtime.
- [x] Add tests from now-proxy for `handle: miss`
- [x] Add tests from now-proxy for `handle: hit`
- [x] Add file output renaming when `featHandleMiss` is true (also assign true for now dev)
No functionality change here, this just removes the `Package` and
`BuildConfig` types from `src/util/dev/types.ts` in favor of the
matching types from `@now/build-utils`.
Also a lot of prettier formatting…
* Move now-cli to /packages/now-cli
* Fix .gitignore paths
* Add now-client
* Add lerna to top level
* Add scripts
* Update codeowners
* Fix `/now-cli/build.ts` script
* Fix circleci path to artifacts
* Use relative paths
* Fix path to scripts
* Add test-lint script
* Add missing return type
* Fix typo in test-lint
* Fix string match in shell scripts
* Fix path to hugo
* Add package node_modules
* Delete lock files in packages, use root yarn.lock
* Add missing b.js file
* Add test-integration-now-dev script
* Add missing test files
* Add missing integration test script
* Add missing test files
* Delete travis.yml
* Fix ts-jest in now-client
* Add support for Node 8 (ES2015 target)
* Add support for Node 8
* Add polyfill for Node 8
* Fix polyfill for Node 8
* Only run coverage for now-cli
* Add packages from now-builders
* Run integration tests for builders
* Add node_modules to cache
* Add root readme.md
* Move readme to top level
* Add yarn bootstrap
* Add bootstrap step
* Add dist to `persist_to_workspace`
* Fix 08-yarn-npm integration test
* Remove duplicate path
* Change stdio to inherit
* Add back store_artifacts
* testing - remove bootstrap step
* Add back now-build-utils
* Remove bootstrap step
* Fix test again
* Add console.log()
* Fix lint
* Use local ncc version
* Install go
* Revert changes to stdio and console.log()
* Add missing now-go test
* Add missing integration tests
* Add --runInBand flag
* Fix now-node-bridge persistence
* Add missing symlinks
* Add codeowners
* Consolidate into single run.sh function
* Run uniq
* Fix typo
* Change now-routing-utils to test-unit
* Special case test for node 8
* Add docs from builders
* Only run script for modified packages
* Add test-integration-once which only runs once
* Fix set intersection
