validator numberOrString.ts

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  import { ValidatorConstraint, type ValidatorConstraintInterface } from 'class-validator';

@ValidatorConstraint({ name: 'string-or-number', async: false })
export class IsNumberOrString implements ValidatorConstraintInterface {
  public validate(value: number | string) {
    return typeof value === 'number' || typeof value === 'string';
  }

  public defaultMessage() {
    return '($value) must be number or string';
  }
}