figure-3.ts

class FormControl<Value = any, Data = any>
  implements AbstractControl<Value, Data> {
  id: ControlId;

  markTouched(value: boolean, options: ControlEventOptions = {}) {
    if (value !== this._touched) {
      this.source.next({
        source: options.source || this.id,
        processed: [],
        type: 'StateChange',
        changes: new Map([['touched', value]]),
        noEmit: options.noEmit,
        meta: options.meta,
      });
    }
  }

  // ...
}