docs: function getCacheFilePaths(props: {
    filePath: string,
    transformOptions: TransformOptions,
  }): CacheFilePaths {
    const hasher = imurmurhash()
      .hash(props.filePath)
      .hash(jsonStableStringify(props.transformOptions) || '');
    const hash = toFixedHex(8, hasher.result());
    const prefix = hash.substr(0, 2);
    const fileName = `${hash.substr(2)}${path.basename(props.filePath)}`;
    const base = path.join(getCacheDirPath(), prefix, fileName);
    return {transformedCode: base, metadata: base + '.meta'};
  }