validation-idea.ts

type Validator<T> = (value: T) => boolean;

class FormInput<T> {
    constructor(public value: T, public validators: Validator<T>[]){}

    get isValid(): boolean {
        return this.validators.every(v => v(this.value));
    }
}

class FormGroup<T extends object> {
    constructor(public inputs: { [K in keyof T]: FormInput<T[K]>}) {}

    get isValid(): boolean {
        return Object.values(this.inputs).every((v: any) => v.isValid === true)
    }
}