Function onChange

packages/forms/src/directives/shared.ts:293–299

(newValue?: any, emitModelEvent?: boolean)

function setUpModelChangePipeline(control: FormControl, dir: NgControl): void {
  const onChange = (newValue?: any, emitModelEvent?: boolean) => {
    // control -> view
    dir.valueAccessor!.writeValue(newValue);

    // control -> ngModel
    if (emitModelEvent) dir.viewToModelUpdate(newValue);
  };
  control.registerOnChange(onChange);

  // Register a callback function to cleanup onChange handler