import { registerDecorator, ValidationOptions, ValidationArguments } from 'class-validator';

export function IsStringOrNull() {
	// tslint:disable-next-line:only-arrow-functions
	return (object: object, propertyName: string) => {
		registerDecorator({
			target: object.constructor,
			propertyName,
			// options: validationOptions,
			// constraints: [property],
			name: 'isStringOrNull',
			validator: {
				validate(value: any, args: ValidationArguments) {
					return (value === null || typeof value === 'string');
				}
			}
		});
	};
}