Function getTokenOrFunctionIdentity

packages/router/src/utils/preactivation.ts:66–82

(
  tokenOrFunction: Function | ProviderToken<T>,
  injector: Injector,
)

}

export function getTokenOrFunctionIdentity<T>(
  tokenOrFunction: Function | ProviderToken<T>,
  injector: Injector,
): Function | T {
  const NOT_FOUND = Symbol();
  const result = injector.get<T | Symbol>(tokenOrFunction, NOT_FOUND);
  if (result === NOT_FOUND) {
    if (typeof tokenOrFunction === 'function' && !isInjectable(tokenOrFunction)) {
      // We think the token is just a function so return it as-is
      return tokenOrFunction;
    } else {
      // This will throw the not found error
      return injector.get<T>(tokenOrFunction);
    }
  }
  return result as T;
}

function getChildRouteGuards(
  futureNode: TreeNode<ActivatedRouteSnapshot>,