Function init

cli/init.js:8–92

(args)

import { SERVICE_WORKER_BUILD_PATH } from '../config/constants.js'

export async function init(args) {
  const CWD = args.cwd || process.cwd()
  const publicDir = args._[1] ? normalizePath(args._[1]) : undefined

  const packageJsonPath = path.resolve(CWD, 'package.json')
  const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'))
  const savedWorkerDirectories = Array.prototype
    .concat((packageJson.msw && packageJson.msw.workerDirectory) || [])
    .map(normalizePath)

  if (publicDir) {
    // If the public directory was provided, copy the worker script
    // to that directory only. Even if there are paths stored in "msw.workerDirectory",
    // those will not be touched.
    await copyWorkerScript(publicDir, CWD)
    const relativePublicDir = path.relative(CWD, publicDir)
    printSuccessMessage([publicDir])

    if (args.save) {
      // Only save the public path if it's not already saved in "package.json".
      if (!savedWorkerDirectories.includes(relativePublicDir)) {
        saveWorkerDirectory(packageJsonPath, relativePublicDir)
      }
    }
    // Explicitly check if "save" was not provided (was null).
    // You can also provide the "--no-save" option, and then "args.save"
    // will equal to false.
    else if (args.save == null) {
      // eslint-disable-next-line no-console
      console.log(`\
      ${colors.cyan(
        'INFO',
      )} In order to ease the future updates to the worker script,
      we recommend saving the path to the worker directory in your package.json.`)

      // If the "--save" flag was not provided, prompt to save
      // the public path.
      promptWorkerDirectoryUpdate(
        `Do you wish to save "${relativePublicDir}" as the worker directory?`,
        packageJsonPath,
        relativePublicDir,
      )
    }

    return
  }

  // Calling "init" without a public directory but with the "--save" flag is a no-op.
  invariant(
    args.save == null,
    'Failed to copy the worker script: cannot call the "init" command without a public directory but with the "--save" flag. Either drop the "--save" flag to copy the worker script to all paths listed in "msw.workerDirectory", or add an explicit public directory to the command, like "npx msw init ./public".',
  )

  // If the public directory was not provided, check any existing
  // paths in "msw.workerDirectory". When called without the public
  // directory, the "init" command must copy the worker script
  // to all the paths stored in "msw.workerDirectory".
  if (savedWorkerDirectories.length > 0) {