Method group

packages/forms/src/form_builder.ts:272–287

(
    controls: {[key: string]: any},
    options: AbstractControlOptions | {[key: string]: any} | null = null,
  )

  group(controls: {[key: string]: any}, options: {[key: string]: any}): FormGroup;

  group(
    controls: {[key: string]: any},
    options: AbstractControlOptions | {[key: string]: any} | null = null,
  ): FormGroup {
    const reducedControls = this._reduceControls(controls);
    let newOptions: FormControlOptions = {};
    if (isAbstractControlOptions(options)) {
      // `options` are `AbstractControlOptions`
      newOptions = options;
    } else if (options !== null) {
      // `options` are legacy form group options
      newOptions.validators = (options as any).validator;
      newOptions.asyncValidators = (options as any).asyncValidator;
    }
    return new FormGroup(reducedControls, newOptions);
  }

  /**
   * @description