Function readFileGeneric

FS.common.js:147–175

* Generic function used by readFile and readFileAssets

(filepath: string, encodingOrOptions: ?string, command: Function)

 * Generic function used by readFile and readFileAssets
 */
function readFileGeneric(filepath: string, encodingOrOptions: ?string, command: Function) {
  var options = {
    encoding: 'utf8'
  };

  if (encodingOrOptions) {
    if (typeof encodingOrOptions === 'string') {
      options.encoding = encodingOrOptions;
    } else if (typeof encodingOrOptions === 'object') {
      options = encodingOrOptions;
    }
  }

  return command(normalizeFilePath(filepath)).then((b64) => {
    var contents;

    if (options.encoding === 'utf8') {
      contents = utf8.decode(base64.decode(b64));
    } else if (options.encoding === 'ascii') {
      contents = base64.decode(b64);
    } else if (options.encoding === 'base64') {
      contents = b64;
    } else {
      throw new Error('Invalid encoding type "' + String(options.encoding) + '"');
    }

    return contents;
  });
}

/**
 * Generic function used by readDir and readDirAssets