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webpack-license-plugin

4.0.1 • Public • Published


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webpack-license-plugin

Manage third-party license compliance in your webpack build

CircleCI status Code coverage License: MIT Contact on Twitter

Key FeaturesInstallationHow to useAvailable optionsExamples

Key features

This plugin extracts open source license information about all of the npm packages in your webpack output and helps you identify and fix problems with your open source licensing policy.

This plugin has full test coverage and is tested with webpack 2, 3, 4 and 5. It will help you:

  • Discover every npm package used in your webpack output
  • Find out how it is licensed
  • Cancel builds that include unacceptable licenses
  • Create a customized inventory (usually called bill of materials) in json, html, csv or other formats

Installation

Install webpack-license-plugin as a development dependency to your current project

npm

npm install -D webpack-license-plugin

yarn

yarn add -D webpack-license-plugin

How to use

Use webpack-license-plugin in your webpack configuration by adding it to the plugins array.

const LicensePlugin = require('webpack-license-plugin')
 
module.exports = {
  plugins: [
    // there might be other plugins here
    new LicensePlugin()
  ],
}

Available options

Options are given as an Object to the first parameter of the LicensePlugin constructor:

new LicensePlugin({ outputFilename: 'thirdPartyNotice.json' })

The available options are:

Name Description
additionalFiles Default: {}. Object that defines additional files that should be generated by this plugin based on it's default output (e.g. an html representation of the licenses in addition to the generated json). Keys represent filenames, values are functions that get invoked with the packages array and should return the content written to the additional file.
licenseOverrides Default: {}. Object with licenses to override. Keys have the format <name>@<version>, values are valid spdx license expressions. This can be helpful when license information is inconclusive and has been manually checked.
outputFilename Default: oss-licenses.json. Path to the output file that will be generated. Relative to the bundle output directory.
replenishDefaultLicenseTexts Default: false. When this is enabled, default license texts are taken from spdx.org for packages where no license text was found.
unacceptableLicenseTest When this option is set, it is invoked for every package with a single string parameter: license. It should return true when the license is unacceptable and encountering it should fail the build.

Example with custom options

This example writes the result to a file named meta/licenses.json in the output directory, fails whenever it encounters one of the given licenses and overrides the license of the package fuse.js@3.2.1.

const LicensePlugin = require('webpack-license-plugin')
 
module.exports = {
  // ...
  plugins: [
    new LicensePlugin({
      licenseOverrides: {
        // has "Apache" in package.json, but Apache-2.0 text in LICENSE file
        'fuse.js@3.2.1': 'Apache-2.0'
      },
      outputFilename: 'meta/licenses.json',
      unacceptableLicenseTest: (license) => ['GPL', 'AGPL', 'LGPL', 'NGPL'].includes(license),
    }),
  ],
}

Default output

The output is a oss-licenses.json file in the webpack build output directory. It contains an array of packages that were found to be part of the webpack output and lists several license-related details for every package:

Name Description
name package name
version package version
author author listed in package.json (if available)
repository repository url listed in package.json (if available)
source package tarball url on npm registry
license the license listed in package.json. If it's not available or not a valid spdx license expression, additional files such as LICENSE or README are being looked at in order to parse the license data from them. (this will be shown with a * next to the name of the license and may require further manual verification)
licenseText the license text read from a file matching /^licen[cs]e/i in the package's root

Example output file

[
  {
    "name": "fbjs",
    "version": "0.8.17",
    "repository": "https://github.com/facebook/fbjs",
    "source": "https://registry.npmjs.org/fbjs/-/fbjs-0.8.17.tgz",
    "license": "MIT",
    "licenseText": "..."
  },
  {
    "name": "object-assign",
    "version": "4.1.1",
    "author": "Sindre Sorhus",
    "repository": "https://github.com/sindresorhus/object-assign",
    "source": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
    "license": "MIT",
    "licenseText": "..."
  },
  {
    "name": "react-dom",
    "version": "16.4.2",
    "repository": "https://github.com/facebook/react",
    "source": "https://registry.npmjs.org/react-dom/-/react-dom-16.4.2.tgz",
    "license": "MIT",
    "licenseText": "..."
  },
  {
    "name": "react",
    "version": "16.4.2",
    "repository": "https://github.com/facebook/react",
    "source": "https://registry.npmjs.org/react/-/react-16.4.2.tgz",
    "license": "MIT",
    "licenseText": "..."
  }
]

Examples

additionalFiles examples

When the additionalFiles option is set, the output shown above is passed into the transform function as an array for every additional file configured.

This way, the output can be formatted to any format you might need and then be written to one or more additional files.

Package list as CSV

const LicensePlugin = require('webpack-license-plugin')
 
const csvTransform = (packages) => {
  const keys = ['name', 'version', 'license']
 
  return [
    '"sep=,"',
    keys.join(','),
    ...packages.map(pckg => keys.map(key => `="${pckg[key]}"`).join(',')),
  ].join('\n')
}
 
module.exports = {
  // ...
  plugins: [
    new LicensePlugin({
      additionalFiles: {
        'oss-licenses.csv': csvTransform
      }
    }),
  ],
}

Package list and additional summary

const LicensePlugin = require('webpack-license-plugin')
 
module.exports = {
  // ...
  plugins: [
    new LicensePlugin({
      additionalFiles: {
        'oss-summary.json': packages => {
          return JSON.stringify(
            packages.reduce(
              (prev, { license }) => ({
                ...prev,
                [license]: prev[license] ? prev[license] + 1 : 1,
              }),
              {}
            ),
            null,
            2
          )
        },
      },
    }),
  ],
}

install

npm i webpack-license-plugin

Downloadsweekly downloads

353

version

4.0.1

license

MIT

homepage

github.com

repository

Gitgithub

last publish

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