Function scssProcessor

packages/vite/src/node/plugins/css.ts:2621–2709

(
  maxWorkers: number | undefined,
)

}

const scssProcessor = (
  maxWorkers: number | undefined,
): StylePreprocessor<SassStylePreprocessorInternalOptions> => {
  let worker: ReturnType<typeof makeScssWorker> | undefined
  let failedSassEmbedded: boolean | undefined
  const normalizedErrors = new WeakSet<Error>()

  return {
    async close() {
      await worker?.stop()
    },
    async process(environment, source, root, options, resolvers) {
      let sassPackage = loadSassPackage(root, failedSassEmbedded ?? false)
      if (failedSassEmbedded === undefined) {
        failedSassEmbedded = false
        try {
          await import(sassPackage.path)
        } catch (e) {
          if (/sass-embedded-[a-z0-9]+-[a-z0-9]+/i.test(e.message)) {
            failedSassEmbedded = true
            sassPackage = loadSassPackage(root, failedSassEmbedded)
          }
        }
      }

      worker ??= makeScssWorker(environment, resolvers, maxWorkers)

      const { content: data, map: additionalMap } = await getSource(
        source,
        options.filename,
        options.additionalData,
        options.enableSourcemap,
      )

      const optionsWithoutAdditionalData = {
        ...options,
        additionalData: undefined,
      }
      try {
        const result = await worker.run(
          pathToFileURL(sassPackage.path).href,
          data,
          optionsWithoutAdditionalData,
        )
        const deps = result.stats.includedFiles.map((f) => cleanScssBugUrl(f))
        const map: ExistingRawSourceMap | undefined = result.map
          ? JSON.parse(result.map.toString())
          : undefined

        if (map) {
          // Note: the real `Sourcemap#sources` maybe `null`, but rollup typing is not handle it.
          map.sources = map.sources!.map((url) =>
            url!.startsWith('file://')
              ? normalizePath(fileURLToPath(url!))
              : url,
          )
        }