Validating String Literal Type with class-validator

Question

I have this type:

export type BranchOperatorRole = 'none' | 'seller' | 'operator' | 'administrator';

With which class-validator decorator can I validate that a property has one of those values?

import { IsEmail, IsString, Contains } from "class-validator";

export type BranchOperatorRole = 'none' | 'seller' | 'operator' | 'administrator';

export class AddBranchOperatorRequest extends User {

    @IsEmail()
    email: string;

    @Contains(BranchOperatorRole )
    role: BranchOperatorRole;

}

Answer 1

const roles = ['none', 'seller', 'operator', 'administrator'] as const;
export type BranchOperatorRole = typeof roles[number];

export class AddBranchOperatorRequest extends User {

    @IsEmail()
    email: string;

    @IsIn(roles)
    role: BranchOperatorRole;

}