Form validation with class-validator

import { validateOrReject, Length, IsEmail, IsString} from "class-validator";
import type { ValidationError } from "class-validator";

// validation
export class LoginValidation {
  @IsEmail()
  email!: string | null;

  @IsString()
  @Length(8, 16)
  password!: string | null;
}

export async function validateInput (input: LoginValidation) {
  try {
    await validateOrReject(input);
    return { errors: {} };
  } catch (err) {
    console.warn("[Validations] error");
    const validationErrors = err as ValidationError[];
    const errorsList: Record<string, string> = validationErrors.reduce(
    (prevError, currError) => {
      const property = currError.property;
      const message = Object.values(currError.constraints!)[0];
      return {...prevError, [property]: message };
    },{});
    return { errors: errorsList };
  }
}

//example
const validation = new LoginValidation();
validation.email = "email"
validation.password="some+difficult-password"

const validate = await validateInput(validation);
//{errors: {email: "email must be a valid email"}}