Function Inject

packages/di/src/common/decorators/inject.ts:153–172

(
  token?: TokenProvider<T> | (() => TokenProvider<T>),
  opts: TransformInjectedProviderCB<T> | Partial<Omit<BindInjectablePropertyOpts<T>, "token">> = {}
)

  opts?: Partial<Omit<BindInjectablePropertyOpts<T>, "token">>
): any;
export function Inject<T = any>(
  token?: TokenProvider<T> | (() => TokenProvider<T>),
  opts: TransformInjectedProviderCB<T> | Partial<Omit<BindInjectablePropertyOpts<T>, "token">> = {}
) {
  opts = typeof opts === "function" ? {transform: opts} : opts;

  return (target: Object, propertyKey: string | symbol | undefined, index?: number) => {
    const bindingType = decoratorTypeOf([target, propertyKey, index]);

    switch (bindingType) {
      case DecoratorTypes.PARAM_CTOR:
        if (token) {
          setToken(token, {target, propertyKey, parameterIndex: index!});
        }
        break;
      case DecoratorTypes.PROP:
        bindInjectableProperty(target, propertyKey!, {...opts, token});
    }
  };
}