code: function File(retries, cdn, options) {
    options = options || {};
  
    this.backoff = new Backoff({ min: 100, max: 20000 });
    this.mime = options.mime || {};
    this.retries = retries || 5;
    this.client = cdn.client;
    this.cdn = cdn;
  }
docs: Representation of a single file operation for the CDN.
  
  @constructor
  @param {Number} retries Amount of retries.
  @param {CDNUp} cdn CDN reference.
  @param {Object} options Additional configuration.
  @api private