node_modules/zone.js/lib/browser/canvas.ts

/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
Zone.__load_patch('canvas', (global: any, Zone: ZoneType, api: _ZonePrivate) => {
  const HTMLCanvasElement = global['HTMLCanvasElement'];
  if (typeof HTMLCanvasElement !== 'undefined' && HTMLCanvasElement.prototype &&
      HTMLCanvasElement.prototype.toBlob) {
    api.patchMacroTask(HTMLCanvasElement.prototype, 'toBlob', (self: any, args: any[]) => {
      return {name: 'HTMLCanvasElement.toBlob', target: self, cbIdx: 0, args: args};
    });
  }
});