Function patchMicroTask

packages/zone.js/lib/common/utils.ts:510–540

(
  obj: any,
  funcName: string,
  metaCreator: (self: any, args: any[]) => MicroTaskMeta,
)

}

export function patchMicroTask(
  obj: any,
  funcName: string,
  metaCreator: (self: any, args: any[]) => MicroTaskMeta,
) {
  let setNative: Function | null = null;

  function scheduleTask(task: Task) {
    const data = <MacroTaskMeta>task.data;
    data.args[data.cbIdx] = function () {
      task.invoke.apply(this, arguments);
    };
    setNative!.apply(data.target, data.args);
    return task;
  }

  setNative = patchMethod(
    obj,
    funcName,
    (delegate: Function) =>
      function (self: any, args: any[]) {
        const meta = metaCreator(self, args);
        if (meta.cbIdx >= 0 && typeof args[meta.cbIdx] === 'function') {
          return Zone.current.scheduleMicroTask(meta.name, args[meta.cbIdx], meta, scheduleTask);
        } else {
          // cause an error by calling it directly.
          return delegate.apply(self, args);
        }
      },
  );
}

export function attachOriginToPatched(patched: Function, original: any) {
  (patched as any)[zoneSymbol('OriginalDelegate')] = original;