Function lazy

packages/core/src/decorators/lazy.ts:15–27

(factory: () => unknown)

 * @param factory - A function that returns the value of this property.
 */
export function lazy(factory: () => unknown): PropertyDecorator {
  return (target, propertyKey) => {
    let value: unknown = UNINITIALIZED;
    Object.defineProperty(target, propertyKey, {
      get(): any {
        if (value === UNINITIALIZED) {
          value = factory.call(this);
        }
        return value;
      },
    });
  };
}