Function licensePlugin

packages/vite/rollupLicensePlugin.ts:7–128

(
  licenseFilePath: string,
  licenseTitle: string,
  packageName: string,
  additionalSection?: string,
)

import type { Plugin, PluginContext } from 'rollup'

export default function licensePlugin(
  licenseFilePath: string,
  licenseTitle: string,
  packageName: string,
  additionalSection?: string,
): Plugin {
  const originalPlugin = license({
    thirdParty(dependencies) {
      // https://github.com/rollup/rollup/blob/master/build-plugins/generate-license-file.js
      // MIT Licensed https://github.com/rollup/rollup/blob/master/LICENSE-CORE.md
      const coreLicense = fs.readFileSync(
        new URL('../../LICENSE', import.meta.url),
        'utf-8',
      )

      const deps = sortDependencies(dependencies)
      const licenses = sortLicenses(
        new Set(
          dependencies.map((dep) => dep.license).filter(Boolean) as string[],
        ),
      )

      let dependencyLicenseTexts = ''
      for (let i = 0; i < deps.length; i++) {
        // Find dependencies with the same license text so it can be shared
        const licenseText = deps[i].licenseText
        const sameDeps = [deps[i]]
        if (licenseText) {
          for (let j = i + 1; j < deps.length; j++) {
            if (licenseText === deps[j].licenseText) {
              sameDeps.push(...deps.splice(j, 1))
              j--
            }
          }
        }

        let text = `## ${sameDeps.map((d) => d.name).join(', ')}\n`
        const depInfos = sameDeps.map((d) => getDependencyInformation(d))

        // If all same dependencies have the same license and contributor names, show them only once
        if (
          depInfos.length > 1 &&
          depInfos.every(
            (info) =>
              info.license === depInfos[0].license &&
              info.names === depInfos[0].names,
          )
        ) {
          const { license, names } = depInfos[0]
          const repositoryText = depInfos
            .map((info) => info.repository)
            .filter(Boolean)
            .join(', ')

          if (license) text += `License: ${license}\n`
          if (names) text += `By: ${names}\n`
          if (repositoryText) text += `Repositories: ${repositoryText}\n`
        }