license-checker-webpack-plugin

Webpack plugin that verifies licenses of all external dependencies in a compilation, and outputs all that information to a file.

Installation

npm

npm install license-checker-webpack-plugin --save-dev

yarn

yarn add license-checker-webpack-plugin --dev

Usage

Require the plugin into your Webpack configuration, and pass it to the plugins array.

const LicenseCheckerWebpackPlugin = require("license-checker-webpack-plugin");

module.exports = {
  // ...
  plugins: [new LicenseCheckerWebpackPlugin({ outputFilename: "ThirdPartyNotices.txt" })]
};

Options

Property	Type	Default	Description
allow	string	"(Apache-2.0 OR BSD-2-Clause OR BSD-3-Clause OR MIT)"	SPDX expression with allowed licenses.
ignore	array	[]	Array of dependencies to ignore, in the format ["<dependency name>@<version range>"]. For example, ["assignment@^2.0.0"].
override	object	{}	Object of dependencies to override, in the format {"<dependency name>@<version range>": { ... }}. For example, {"assignment@^2.0.0": { licenseName: "MIT" }}.
emitError	boolean	false	Whether to emit errors instead of warnings.
outputWriter	string or function	See defaultOutputWriter.	Path to a .ejs template, or function that will generate the contents of the third-party notices file.
outputFilename	string	"ThirdPartyNotices.txt"	Name of the third-party notices file with all licensing information.

The data that gets passed to the outputWriter function looks like this:

[
  {
    "name": "react",
    "version": "16.3.2",
    "repository": "git+https://github.com/facebook/react.git",
    "licenseName": "MIT",
    "licenseText": "MIT License\n\nCopyright (c) 2013-present, Facebook, Inc. [...]"
  },
  {
    "name": "webpack",
    "version": "4.8.3",
    "author": "Tobias Koppers @sokra",
    "repository": "git+https://github.com/webpack/webpack.git",
    "licenseName": "MIT",
    "licenseText": "Copyright JS Foundation and other contributors [...]"
  },
  {
    "name": "whatwg-fetch",
    "version": "2.0.4",
    "repository": "git+https://github.com/github/fetch.git",
    "licenseName": "MIT",
    "licenseText": "Copyright (c) 2014-2016 GitHub, Inc. [...]"
  }
]

Here's an example webpack.config.js file that uses all options:

const path = require("path");
const LicenseCheckerWebpackPlugin = require("license-checker-webpack-plugin");
const template = require("lodash.template");

module.exports = {
  // ...
  plugins: [
    new LicenseCheckerWebpackPlugin({
      allow: "(Apache-2.0 OR BSD-2-Clause OR BSD-3-Clause OR MIT)",
      ignore: ["@microsoft/*"],
      override: {
        "assignment@2.0.0": { licenseName: "MIT" },
        "intersection-observer@0.5.0": { licenseName: "MIT" },
        "querystring-es3@0.2.1": { licenseName: "MIT" }
      },
      emitError: true,
      outputWriter: path.resolve(__dirname, "customTemplate.ejs"),
      outputFilename: "ThirdPartyNotices.txt"
    })
  ]
};

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.microsoft.com.

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.

Licensing

All files on this repository are subject to the MIT license. Please read the LICENSE file at the root of the project.