Method truncate

lib/internal/vfs/file_system.js:904–915

* Truncates a file asynchronously. * @param {string} filePath The file path * @param {number|Function} [len] The new length or callback * @param {Function} [callback] Callback (err)

(filePath, len, callback)

   * @param {Function} [callback] Callback (err)
   */
  truncate(filePath, len, callback) {
    if (typeof len === 'function') {
      callback = len;
      len = 0;
    }
    try {
      this.truncateSync(filePath, len);
      process.nextTick(callback, null);
    } catch (err) {
      process.nextTick(callback, err);
    }
  }

  /**
   * Truncates a file descriptor asynchronously.