Method createDecorator

packages/core/services/reflector.service.ts:57–72

(
    options: CreateDecoratorOptions<TParam, TTransformed> = {},
  )

    options: CreateDecoratorWithTransformOptions<TParam, TTransformed>,
  ): ReflectableDecorator<TParam, TTransformed>;
  static createDecorator<TParam, TTransformed = TParam>(
    options: CreateDecoratorOptions<TParam, TTransformed> = {},
  ): ReflectableDecorator<TParam, TTransformed> {
    const metadataKey = options.key ?? uid(21);
    const decoratorFn =
      (metadataValue: TParam) =>
      (target: object | Function, key?: string | symbol, descriptor?: any) => {
        const value = options.transform
          ? options.transform(metadataValue)
          : metadataValue;
        SetMetadata(metadataKey, value ?? {})(target, key!, descriptor);
      };

    decoratorFn.KEY = metadataKey;
    return decoratorFn as ReflectableDecorator<TParam, TTransformed>;
  }

  /**
   * Retrieve metadata for a reflectable decorator for a specified target.