Function isValid

src/cdk/stepper/stepper.ts:630–632

(control: StepControl)

}

function isValid(control: StepControl): boolean {
  return isField(control) ? control().valid() : control.valid;
}

function isInvalid(control: StepControl): boolean {
  // Note: it's a bit redundant to have both `isValid` and `isInvalid`. We need both, because