FormBuilder

  class FormBuilder { readonly nonNullable: NonNullableFormBuilder;
 group<T extends {}>(controls: T, options?: AbstractControlOptions): FormGroup<{ [K in keyof T]: ɵElement<T[K], null>; }>; group(controls: { [key: string]: any; }, options: { [key: string]: any; }): FormGroup<any>;
 record<T>(controls: { [key: string]: T; }, options?: AbstractControlOptions): FormRecord<ɵElement<T, null>>;
 control<T>(formState: T | FormControlState<T>, opts: FormControlOptions & { initialValueIsDefault: true; }): FormControl<T>; control<T>(formState: T | FormControlState<T>, opts: FormControlOptions & { nonNullable: true; }): FormControl<T>; control<T>(formState: T | FormControlState<T>, opts: FormControlOptions, asyncValidator: AsyncValidatorFn | AsyncValidatorFn[]): FormControl<T>; control<T>(formState: T | FormControlState<T>, validatorOrOpts?: ValidatorFn | FormControlOptions | ValidatorFn[], asyncValidator?: AsyncValidatorFn | AsyncValidatorFn[]): FormControl<T>;
 array<T>(controls: T[], validatorOrOpts?: ValidatorFn | AbstractControlOptions | ValidatorFn[], asyncValidator?: AsyncValidatorFn | AsyncValidatorFn[]): FormArray<ɵElement<T, null>>;}