ControlArray(List<AbstractControl> controls, [ ValidatorFn validator = null, AsyncValidatorFn asyncValidator = null ])

Source 

ControlArray(this.controls,
    [ValidatorFn validator = null, AsyncValidatorFn asyncValidator = null])
    : super(validator, asyncValidator) {
  this._initObservables();
  this._setParentForControls();
  this.updateValueAndValidity(onlySelf: true, emitEvent: false);
}