Method queue

packages/babel-generator/src/buffer.ts:124–127

* Add a string to the buffer than can be reverted.

(char: typeof charcodes.space | typeof charcodes.semicolon)

   * Add a string to the buffer than can be reverted.
   */
  queue(char: typeof charcodes.space | typeof charcodes.semicolon): void {
    this._flush();
    this._queuedChar = char;
  }

  _flush(): void {
    const queuedChar = this._queuedChar;