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@vincentriemer/ncc

v0.20.5

Published

[![Build Status](https://circleci.com/gh/zeit/ncc.svg?&style=shield)](https://circleci.com/gh/zeit/workflows/ncc) [![codecov](https://codecov.io/gh/zeit/ncc/branch/master/graph/badge.svg)](https://codecov.io/gh/zeit/ncc)

Downloads

2

Readme

ncc

Build Status codecov

Simple CLI for compiling a Node.js module into a single file, together with all its dependencies, gcc-style.

Motivation

  • Publish minimal packages to npm
  • Only ship relevant app code to serverless environments
  • Don't waste time configuring bundlers
  • Generally faster bootup time and less I/O overhead
  • Compiled language-like experience (e.g.: go)

Design goals

  • Zero configuration
  • TypeScript built-in
  • Only supports Node.js programs as input / output
  • Support all Node.js patterns and npm modules

Usage

Installation

npm i -g @zeit/ncc

Usage

$ ncc build input.js -o dist

Outputs the Node.js compact build of input.js into dist/index.js.

Execution Testing

For testing and debugging, a file can be built into a temporary directory and executed with full source maps support with the command:

$ ncc run input.js

With TypeScript

The only requirement is to point ncc to .ts or .tsx files. A tsconfig.json file is necessary. Most likely you want to indicate es2015 support:

{
  "compilerOptions": {
    "target": "es2015",
    "moduleResolution": "node"
  }
}

Package Support

Some packages may need some extra options for ncc support in order to better work with the static analysis.

See package-support.md for some common packages and their usage with ncc.

Programmatically From Node.js

require('@zeit/ncc')('/path/to/input', {
  // provide a custom cache path or disable caching
  cache: "./custom/cache/path" | false,
  // externals to leave as requires of the build
  externals: ["externalpackage"],
  // directory outside of which never to emit assets
  filterAssetBase: process.cwd(), // default
  minify: false, // default
  sourceMap: false, // default
  sourceMapBasePrefix: '../', // default treats sources as output-relative
  // when outputting a sourcemap, automatically include
  // source-map-support in the output file (increases output by 32kB).
  sourceMapRegister: true, // default
  watch: false, // default
  v8cache: false, // default
  quiet: false, // default
  debugLog: false // default
}).then(({ code, map, assets }) => {
  console.log(code);
  // Assets is an object of asset file names to { source, permissions, symlinks }
  // expected relative to the output code (if any)
})

When watch: true is set, the build object is not a promise, but has the following signature:

{
  // handler re-run on each build completion
  // watch errors are reported on "err"
  handler (({ err, code, map, assets }) => { ... })
  // handler re-run on each rebuild start
  rebuild (() => {})
  // close the watcher
  void close ();
}

Caveats

  • Files / assets are relocated based on a static evaluator. Dynamic non-statically analyzable asset loads may not work out correctly