Function injectRootLimpMode

packages/core/src/di/inject_switch.ts:50–67

(
  token: ProviderToken<T>,
  notFoundValue: T | undefined,
  flags: InternalInjectFlags,
)

 * injectable definition.
 */
export function injectRootLimpMode<T>(
  token: ProviderToken<T>,
  notFoundValue: T | undefined,
  flags: InternalInjectFlags,
): T | null {
  const injectableDef: ɵɵInjectableDeclaration<T> | null = getInjectableDef(token);
  if (injectableDef && injectableDef.providedIn == 'root') {
    return injectableDef.value === undefined
      ? (injectableDef.value = injectableDef.factory())
      : injectableDef.value;
  }
  if (flags & InternalInjectFlags.Optional) return null;
  if (notFoundValue !== undefined) return notFoundValue;
  throwProviderNotFoundError(
    token,
    typeof ngDevMode !== 'undefined' && ngDevMode ? 'Injector' : '',
  );
}

/**
 * Assert that `_injectImplementation` is not `fn`.