Function verifySemanticsOfNgModuleDef

packages/core/src/render3/jit/module.ts:236–415

(
  moduleType: NgModuleType,
  allowDuplicateDeclarationsInRoot: boolean,
  importingModule?: NgModuleType,
)

}

function verifySemanticsOfNgModuleDef(
  moduleType: NgModuleType,
  allowDuplicateDeclarationsInRoot: boolean,
  importingModule?: NgModuleType,
): void {
  if (verifiedNgModule.get(moduleType)) return;

  // skip verifications of standalone components, directives, and pipes
  if (isStandalone(moduleType)) return;

  verifiedNgModule.set(moduleType, true);
  moduleType = resolveForwardRef(moduleType);
  let ngModuleDef: NgModuleDef<any>;
  if (importingModule) {
    ngModuleDef = getNgModuleDef(moduleType)!;
    if (!ngModuleDef) {
      throw new Error(
        `Unexpected value '${moduleType.name}' imported by the module '${importingModule.name}'. Please add an @NgModule annotation.`,
      );
    }
  } else {
    ngModuleDef = getNgModuleDefOrThrow(moduleType);
  }
  const errors: string[] = [];
  const declarations = maybeUnwrapFn(ngModuleDef.declarations);
  const imports = maybeUnwrapFn(ngModuleDef.imports);
  flatten(imports)
    .map(unwrapModuleWithProvidersImports)
    .forEach((modOrStandaloneCmpt) => {
      verifySemanticsOfNgModuleImport(modOrStandaloneCmpt, moduleType);
      verifySemanticsOfNgModuleDef(modOrStandaloneCmpt, false, moduleType);
    });
  const exports = maybeUnwrapFn(ngModuleDef.exports);
  declarations.forEach(verifyDeclarationsHaveDefinitions);
  declarations.forEach(verifyDirectivesHaveSelector);
  declarations.forEach((declarationType) => verifyNotStandalone(declarationType, moduleType));
  const combinedDeclarations: Type<any>[] = [
    ...declarations.map(resolveForwardRef),
    ...flatten(imports.map(computeCombinedExports)).map(resolveForwardRef),
  ];
  exports.forEach(verifyExportsAreDeclaredOrReExported);
  declarations.forEach((decl) => verifyDeclarationIsUnique(decl, allowDuplicateDeclarationsInRoot));

  const ngModule = getAnnotation<NgModule>(moduleType, 'NgModule');
  if (ngModule) {
    ngModule.imports &&
      flatten(ngModule.imports)
        .map(unwrapModuleWithProvidersImports)
        .forEach((mod) => {
          verifySemanticsOfNgModuleImport(mod, moduleType);
          verifySemanticsOfNgModuleDef(mod, false, moduleType);
        });
    ngModule.bootstrap && deepForEach(ngModule.bootstrap, verifyCorrectBootstrapType);
    ngModule.bootstrap && deepForEach(ngModule.bootstrap, verifyComponentIsPartOfNgModule);
  }

  // Throw Error if any errors were detected.
  if (errors.length) {