Function createPreprocessorWorkerController

packages/vite/src/node/plugins/css.ts:3158–3182

(maxWorkers: number | undefined)

}

const createPreprocessorWorkerController = (maxWorkers: number | undefined) => {
  const scss = scssProcessor(maxWorkers)
  const less = lessProcessor(maxWorkers)
  const styl = stylProcessor(maxWorkers)

  const sassProcess: StylePreprocessor<SassStylePreprocessorInternalOptions>['process'] =
    (environment, source, root, options, resolvers) => {
      const opts: SassStylePreprocessorInternalOptions = { ...options }
      opts.syntax = 'indented'
      return scss.process(environment, source, root, opts, resolvers)
    }

  const close = async () => {
    await Promise.all([less.close(), scss.close(), styl.close()])
  }

  return {
    [PreprocessLang.less]: less.process,
    [PreprocessLang.scss]: scss.process,
    [PreprocessLang.sass]: sassProcess,
    [PreprocessLang.styl]: styl.process,
    [PreprocessLang.stylus]: styl.process,
    close,
  } as const satisfies Record<PreprocessLang | 'close', unknown>
}

const normalizeMaxWorkers = (maxWorker: number | true | undefined) => {
  if (maxWorker === undefined) return 0