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154 lines
5 KiB
Markdown
154 lines
5 KiB
Markdown
# ncc
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[](https://github.com/vercel/ncc/actions?workflow=CI)
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[](https://codecov.io/gh/vercel/ncc)
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Simple CLI for compiling a Node.js module into a single file,
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together with all its dependencies, gcc-style.
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## Motivation
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- Publish minimal packages to npm
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- Only ship relevant app code to serverless environments
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- Don't waste time configuring bundlers
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- Generally faster bootup time and less I/O overhead
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- Compiled language-like experience (e.g.: `go`)
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## Design goals
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- Zero configuration
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- TypeScript built-in
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- Only supports Node.js programs as input / output
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- Support all Node.js patterns and npm modules
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## Usage
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### Installation
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```bash
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npm i -g @vercel/ncc
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```
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### Usage
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```bash
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$ ncc <cmd> <opts>
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```
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Eg:
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```bash
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$ ncc build input.js -o dist
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```
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If building an `.mjs` or `.js` module inside a `"type": "module"` [package boundary](https://nodejs.org/dist/latest-v16.x/docs/api/packages.html#packages_package_json_and_file_extensions), an ES module output will be created automatically.
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Outputs the Node.js compact build of `input.js` into `dist/index.js`.
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> Note: If the input file is using a `.cjs` extension, then so will the corresponding output file.
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> This is useful for packages that want to use `.js` files as modules in native Node.js using
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> a `"type": "module"` in the package.json file.
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#### Commands:
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```
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build <input-file> [opts]
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run <input-file> [opts]
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cache clean|dir|size
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help
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version
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```
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#### Options:
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```
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-o, --out [dir] Output directory for build (defaults to dist)
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-m, --minify Minify output
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-C, --no-cache Skip build cache population
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-s, --source-map Generate source map
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-a, --asset-builds Build nested JS assets recursively, useful for
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when code is loaded as an asset eg for workers.
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--no-source-map-register Skip source-map-register source map support
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-e, --external [mod] Skip bundling 'mod'. Can be used many times
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-q, --quiet Disable build summaries / non-error outputs
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-w, --watch Start a watched build
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-t, --transpile-only Use transpileOnly option with the ts-loader
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--v8-cache Emit a build using the v8 compile cache
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--license [file] Adds a file containing licensing information to the output
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--stats-out [file] Emit webpack stats as json to the specified output file
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--target [es] ECMAScript target to use for output (default: es2015)
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Learn more: https://webpack.js.org/configuration/target
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-d, --debug Show debug logs
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```
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### Execution Testing
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For testing and debugging, a file can be built into a temporary directory and executed with full source maps support with the command:
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```bash
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$ ncc run input.js
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```
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### With TypeScript
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The only requirement is to point `ncc` to `.ts` or `.tsx` files. A `tsconfig.json`
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file is necessary. Most likely you want to indicate `es2015` support:
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```json
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{
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"compilerOptions": {
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"target": "es2015",
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"moduleResolution": "node"
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}
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}
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```
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If typescript is found in `devDependencies`, that version will be used.
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### Package Support
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Some packages may need some extra options for ncc support in order to better work with the static analysis.
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See [package-support.md](package-support.md) for some common packages and their usage with ncc.
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### Programmatically From Node.js
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```js
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require('@vercel/ncc')('/path/to/input', {
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// provide a custom cache path or disable caching
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cache: "./custom/cache/path" | false,
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// externals to leave as requires of the build
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externals: ["externalpackage"],
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// directory outside of which never to emit assets
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filterAssetBase: process.cwd(), // default
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minify: false, // default
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sourceMap: false, // default
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assetBuilds: false, // default
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sourceMapBasePrefix: '../', // default treats sources as output-relative
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// when outputting a sourcemap, automatically include
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// source-map-support in the output file (increases output by 32kB).
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sourceMapRegister: true, // default
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watch: false, // default
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license: '', // default does not generate a license file
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v8cache: false, // default
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quiet: false, // default
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debugLog: false // default
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}).then(({ code, map, assets }) => {
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console.log(code);
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// Assets is an object of asset file names to { source, permissions, symlinks }
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// expected relative to the output code (if any)
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})
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```
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When `watch: true` is set, the build object is not a promise, but has the following signature:
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```js
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{
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// handler re-run on each build completion
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// watch errors are reported on "err"
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handler (({ err, code, map, assets }) => { ... })
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// handler re-run on each rebuild start
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rebuild (() => {})
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// close the watcher
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void close ();
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}
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```
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## Caveats
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- Files / assets are relocated based on a [static evaluator](https://github.com/zeit/webpack-asset-relocator-loader#how-it-works). Dynamic non-statically analyzable asset loads may not work out correctly
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