Function verifyStandaloneImport

packages/core/src/render3/jit/util.ts:44–87

(depType: Type<unknown>, importingType: Type<unknown>)

}

export function verifyStandaloneImport(depType: Type<unknown>, importingType: Type<unknown>) {
  if (isForwardRef(depType)) {
    depType = resolveForwardRef(depType);
    if (!depType) {
      throw new Error(
        `Expected forwardRef function, imported from "${stringifyForError(
          importingType,
        )}", to return a standalone entity or NgModule but got "${
          stringifyForError(depType) || depType
        }".`,
      );
    }
  }

  if (getNgModuleDef(depType) == null) {
    const def = getComponentDef(depType) || getDirectiveDef(depType) || getPipeDef(depType);
    if (def != null) {
      // if a component, directive or pipe is imported make sure that it is standalone
      if (!def.standalone) {
        const type = getDependencyTypeForError(depType);
        throw new Error(
          `The "${stringifyForError(depType)}" ${type}, imported from "${stringifyForError(
            importingType,
          )}", is not standalone. Does the ${type} have the standalone: false flag?`,
        );
      }
    } else {
      // it can be either a module with provider or an unknown (not annotated) type
      if (isModuleWithProviders(depType)) {
        throw new Error(
          `A module with providers was imported from "${stringifyForError(
            importingType,
          )}". Modules with providers are not supported in standalone components imports.`,
        );
      } else {
        throw new Error(
          `The "${stringifyForError(depType)}" type, imported from "${stringifyForError(
            importingType,
          )}", must be a standalone component / directive / pipe or an NgModule. Did you forget to add the required @Component / @Directive / @Pipe or @NgModule annotation?`,
        );
      }
    }
  }
}