variable type validation in typescript not working

Question

I am new to typescript, i wrote code like below

export class RmdRequest {
    public amount: string;
    public age: number;
}

in my form i have like

in my component i have like below

 onSubmit(formValues:RmdRequest){ }

formValues is a object like below

{amount: 20, age: "Super Hot"}

If you see amount i have declared as string but passing as int. I was expecting this to throw out error of some sort. Am i doing something wrong for validation?

Answer 1

The types you add compile-time only and are erased by the TypeScript compiler at runtime so no type-checking is enforced at runtime. Here's what your code method looks like at runtime after compilation:

onSubmit(formValues) {
}

If you want to do actual validation on your form inputs, there are many options listed in the official documentation.