salesforce · wjhsf · Sep 11, 2025 · Aug 28, 2025 · Sep 2, 2025 · Sep 2, 2025
@@ -355,7 +355,25 @@ export default tseslint.config(
         },
     },
     {
-        files: ['packages/@lwc/integration-karma/**', 'packages/@lwc/integration-not-karma/**'],
+        files: ['packages/@lwc/integration-not-karma/**'],
+
+        languageOptions: {
+            globals: {
+                lwcRuntimeFlags: true,
+                process: true,
+                TestUtils: true,
+                ...globals.browser,
+                ...globals.jasmine,
+            },
+        },
+
+        rules: {
+            'no-var': 'off',
+            'prefer-rest-params': 'off',
+        },
+    },
+    {
+        files: ['packages/@lwc/integration-karma/**'],
 
         languageOptions: {
             globals: {

@@ -1,6 +1,7 @@
 import path from 'node:path';
 import vm from 'node:vm';
 import fs from 'node:fs/promises';
+import { fileURLToPath } from 'node:url';
 import { rollup } from 'rollup';
 import lwcRollupPlugin from '@lwc/rollup-plugin';
 import { DISABLE_STATIC_CONTENT_OPTIMIZATION, ENGINE_SERVER } from '../../helpers/options.js';
@@ -39,7 +40,7 @@ async function getCompiledModule(dir, compileForSSR) {
                 targetSSR: !!compileForSSR,
                 modules: [{ dir: path.join(ROOT_DIR, dir) }],
                 experimentalDynamicComponent: {
-                    loader: 'test-utils',
+                    loader: fileURLToPath(new URL('../../helpers/loader.js', import.meta.url)),
                     strict: true,
                 },
                 enableDynamicComponents: true,
@@ -198,6 +199,7 @@ async function wrapHydrationTest(filePath) {
 
         // FIXME: can we turn these IIFEs into ESM imports?
         return `
+        import * as LWC from 'lwc';
         import { runTest } from '/helpers/test-hydrate.js';
         import config from '/${filePath}?original=1';
         ${onlyFileExists ? 'it.only' : 'it'}('${filePath}', async () => {

@@ -10,8 +10,6 @@ import {
     DISABLE_SYNTHETIC_SHADOW_SUPPORT_IN_COMPILER,
 } from '../../helpers/options.js';
 
-const UTILS = fileURLToPath(new URL('../../helpers/utils.js', import.meta.url));
-
 /** Cache reused between each compilation to speed up the compilation time. */
 let cache;
 
@@ -25,7 +23,7 @@ const createRollupPlugin = (input, options) => {
         // Sourcemaps don't work with Istanbul coverage
         sourcemap: !process.env.COVERAGE,
         experimentalDynamicComponent: {
-            loader: UTILS,
+            loader: fileURLToPath(new URL('../../helpers/dynamic-loader', import.meta.url)),
             strict: true,
         },
         enableDynamicComponents: true,
@@ -88,7 +86,16 @@ const transform = async (ctx) => {
 
         // Rollup should not attempt to resolve the engine and the test utils, Karma takes care of injecting it
         // globally in the page before running the tests.
-        external: ['lwc', 'wire-service', '@test/loader', UTILS],
+        external: [
+            'lwc',
+            'wire-service',
+            '@test/loader',
+            // Some helper files export functions that mutate a global state. The setup file calls
+            // some of those functions and does not get bundled. Including the helper files in the
+            // bundle would create a separate global state, causing tests to fail. We don't need to
+            // mark _all_ helpers as external, but we do anyway for ease of maintenance.
+            /\/helpers\/\w+\.js$/,
+        ],
 
         onwarn(warning, warn) {
             // Ignore warnings from our own Rollup plugin

@@ -1,7 +1,7 @@
 import { API_VERSION } from './options.js';
 
-// These values are based on the API versions in @lwc/shared/api-version
-export const LOWERCASE_SCOPE_TOKENS = API_VERSION >= 59,
+export const // These values are based on the API versions in @lwc/shared/api-version
+    LOWERCASE_SCOPE_TOKENS = API_VERSION >= 59,
     USE_COMMENTS_FOR_FRAGMENT_BOOKENDS = API_VERSION >= 60,
     USE_FRAGMENTS_FOR_LIGHT_DOM_SLOTS = API_VERSION >= 60,
     DISABLE_OBJECT_REST_SPREAD_TRANSFORMATION = API_VERSION >= 60,

@@ -0,0 +1,9 @@
+// Helpers for testing lwc:dynamic
+const register = new Map();
+/**
+ * Called by compiled components to, well, load another component. The path to this file is
+ * specified by the `experimentalDynamicComponent.loader` rollup plugin option.
+ */
+export const load = async (id) => await Promise.resolve(register.get(id));
+export const registerForLoad = (name, Ctor) => register.set(name, Ctor);
+export const clearRegister = () => register.clear();
@@ -40,8 +40,6 @@ export const API_VERSION = process.env.API_VERSION
 
 export const NODE_ENV_FOR_TEST = process.env.NODE_ENV_FOR_TEST || 'development';
 
-export const GREP = process.env.GREP;
-
 export const NATIVE_SHADOW = DISABLE_SYNTHETIC || FORCE_NATIVE_SHADOW_MODE_FOR_TEST;
 
 /** Unique directory name that encodes the flags that the tests were executed with. */

@@ -1,10 +1,12 @@
 // This import ensures that the global `Mocha` object is present for mutation.
 import { JestAsymmetricMatchers, JestChaiExpect, JestExtend } from '@vitest/expect';
 import * as chai from 'chai';
-import * as LWC from 'lwc';
 import { spyOn, fn } from '@vitest/spy';
 import { registerCustomMatchers } from './matchers/index.js';
 import * as TestUtils from './utils.js';
+import { initSignals } from './signals.js';
+
+initSignals();
 
 // FIXME: As a relic of the Karma tests, some test files rely on the global object,
 // rather than importing from `test-utils`.
@@ -47,8 +49,6 @@ function jasmineSpyAdapter(spy) {
 
 // expose so we don't need to import `expect` in every test file
 globalThis.expect = chai.expect;
-// Expose globals for karma compat
-globalThis.LWC = LWC;
 globalThis.spyOn = (object, prop) => jasmineSpyAdapter(spyOn(object, prop));
 globalThis.jasmine = {
     any: expect.any,

@@ -1,7 +1,10 @@
 import { setTrustedSignalSet } from 'lwc';
 
 const signalValidator = new WeakSet();
-setTrustedSignalSet(signalValidator);
+
+export function initSignals() {
+    setTrustedSignalSet(signalValidator);
+}
 
 export function addTrustedSignal(signal) {
     signalValidator.add(signal);

@@ -1,29 +1,7 @@
 /*
  * An as yet uncategorized mishmash of helpers, relics of Karma
  */
-import * as LWC from 'lwc';
-import {
-    ariaAttributes,
-    ariaProperties,
-    ariaPropertiesMapping,
-    nonPolyfilledAriaProperties,
-    nonStandardAriaProperties,
-} from './aria.js';
-import { setHooks, getHooks } from './hooks.js';
-import { spyConsole } from './console.js';
-import {
-    DISABLE_OBJECT_REST_SPREAD_TRANSFORMATION,
-    ENABLE_ELEMENT_INTERNALS_AND_FACE,
-    ENABLE_THIS_DOT_HOST_ELEMENT,
-    ENABLE_THIS_DOT_STYLE,
-    IS_SYNTHETIC_SHADOW_LOADED,
-    LOWERCASE_SCOPE_TOKENS,
-    TEMPLATE_CLASS_NAME_OBJECT_BINDING,
-    USE_COMMENTS_FOR_FRAGMENT_BOOKENDS,
-    USE_FRAGMENTS_FOR_LIGHT_DOM_SLOTS,
-    USE_LIGHT_DOM_SLOT_FORWARDING,
-} from './constants.js';
-import { addTrustedSignal } from './signals.js';
+import { __unstable__ReportingControl } from 'lwc';
 
 // Listen for errors thrown directly by the callback
 function directErrorListener(callback) {
@@ -63,7 +41,7 @@ function windowErrorListener(callback) {
 // 2) We're using native lifecycle callbacks, so the error is thrown asynchronously and can
 //    only be caught with window.addEventListener('error')
 //      - Note native lifecycle callbacks are all thrown asynchronously.
-function customElementCallbackReactionErrorListener(callback) {
+export function customElementCallbackReactionErrorListener(callback) {
     return lwcRuntimeFlags.DISABLE_NATIVE_CUSTOM_ELEMENT_LIFECYCLE
         ? directErrorListener(callback)
         : windowErrorListener(callback);
@@ -74,19 +52,19 @@ function customElementCallbackReactionErrorListener(callback) {
  * @param dispatcher
  * @param runtimeEvents List of runtime events to filter by. If no list is provided, all events will be dispatched.
  */
-function attachReportingControlDispatcher(dispatcher, runtimeEvents) {
-    LWC.__unstable__ReportingControl.attachDispatcher((eventName, payload) => {
+export function attachReportingControlDispatcher(dispatcher, runtimeEvents) {
+    __unstable__ReportingControl.attachDispatcher((eventName, payload) => {
         if (!runtimeEvents || runtimeEvents.includes(eventName)) {
             dispatcher(eventName, payload);
         }
     });
 }
 
-function detachReportingControlDispatcher() {
-    LWC.__unstable__ReportingControl.detachDispatcher();
+export function detachReportingControlDispatcher() {
+    __unstable__ReportingControl.detachDispatcher();
 }
 
-function extractDataIds(root) {
+export function extractDataIds(root) {
     const nodes = {};
 
     function processElement(elm) {
@@ -120,7 +98,7 @@ function extractDataIds(root) {
     return nodes;
 }
 
-function extractShadowDataIds(shadowRoot) {
+export function extractShadowDataIds(shadowRoot) {
     const nodes = {};
 
     // Add the shadow root here even if they don't have [data-id] attributes. This reference is
@@ -140,36 +118,24 @@ function extractShadowDataIds(shadowRoot) {
     return nodes;
 }
 
-let register = {};
-function load(id) {
-    return Promise.resolve(register[id]);
-}
-
-function registerForLoad(name, Ctor) {
-    register[name] = Ctor;
-}
-function clearRegister() {
-    register = {};
-}
-
 // #986 - childNodes on the host element returns a fake shadow comment node on IE11 for debugging purposes. This method
 // filters this node.
-function getHostChildNodes(host) {
+export function getHostChildNodes(host) {
     return Array.prototype.slice.call(host.childNodes).filter(function (n) {
         return !(n.nodeType === Node.COMMENT_NODE && n.tagName.startsWith('#shadow-root'));
     });
 }
 
-function isSyntheticShadowRootInstance(sr) {
+export function isSyntheticShadowRootInstance(sr) {
     return Boolean(sr && sr.synthetic);
 }
 
-function isNativeShadowRootInstance(sr) {
+export function isNativeShadowRootInstance(sr) {
     return Boolean(sr && !sr.synthetic);
 }
 
 // Keep traversing up the prototype chain until a property descriptor is found
-function getPropertyDescriptor(object, prop) {
+export function getPropertyDescriptor(object, prop) {
     do {
         const descriptor = Object.getOwnPropertyDescriptor(object, prop);
         if (descriptor) {
@@ -216,13 +182,13 @@ function stringifyArg(arg) {
     }
 }
 
-const expectConsoleCalls = createExpectConsoleCallsFunc(false);
-const expectConsoleCallsDev = createExpectConsoleCallsFunc(true);
+export const expectConsoleCalls = createExpectConsoleCallsFunc(false);
+export const expectConsoleCallsDev = createExpectConsoleCallsFunc(true);
 
 // Utility to handle unhandled rejections or errors without allowing Jasmine to handle them first.
 // Captures both onunhandledrejection and onerror events, since you might want both depending on
 // native vs synthetic lifecycle timing differences.
-function catchUnhandledRejectionsAndErrors(onUnhandledRejectionOrError) {
+export function catchUnhandledRejectionsAndErrors(onUnhandledRejectionOrError) {
     let originalOnError;
 
     const onError = (e) => {
@@ -257,7 +223,7 @@ function catchUnhandledRejectionsAndErrors(onUnhandledRejectionOrError) {
 
 // Succeeds if the given DOM element is equivalent to the given HTML in terms of nodes and elements. This is
 // basically the same as `expect(element.outerHTML).toBe(html)` except that it works despite bugs in synthetic shadow.
-function expectEquivalentDOM(element, html) {
+export function expectEquivalentDOM(element, html) {
     const fragment = Document.parseHTMLUnsafe(html);
 
     // When the fragment is parsed, the string "abc" is considered one text node. Whereas the engine
@@ -314,41 +280,3 @@ function expectEquivalentDOM(element, html) {
 
     expectEquivalent(element, fragment.body.firstChild);
 }
-
-export {
-    clearRegister,
-    extractDataIds,
-    extractShadowDataIds,
-    getHostChildNodes,
-    isNativeShadowRootInstance,
-    isSyntheticShadowRootInstance,
-    load,
-    registerForLoad,
-    getHooks,
-    setHooks,
-    spyConsole,
-    customElementCallbackReactionErrorListener,
-    ariaPropertiesMapping,
-    ariaProperties,
-    ariaAttributes,
-    nonStandardAriaProperties,
-    nonPolyfilledAriaProperties,
-    getPropertyDescriptor,
-    attachReportingControlDispatcher,
-    detachReportingControlDispatcher,
-    IS_SYNTHETIC_SHADOW_LOADED,
-    expectConsoleCalls,
-    expectConsoleCallsDev,
-    catchUnhandledRejectionsAndErrors,
-    addTrustedSignal,
-    expectEquivalentDOM,
-    LOWERCASE_SCOPE_TOKENS,
-    USE_COMMENTS_FOR_FRAGMENT_BOOKENDS,
-    USE_FRAGMENTS_FOR_LIGHT_DOM_SLOTS,
-    DISABLE_OBJECT_REST_SPREAD_TRANSFORMATION,
-    ENABLE_ELEMENT_INTERNALS_AND_FACE,
-    USE_LIGHT_DOM_SLOT_FORWARDING,
-    ENABLE_THIS_DOT_HOST_ELEMENT,
-    ENABLE_THIS_DOT_STYLE,
-    TEMPLATE_CLASS_NAME_OBJECT_BINDING,
-};
@@ -1,10 +1,10 @@
 import { createElement } from 'lwc';
 import Light from 'x/light';
 import Shadow from 'x/shadow';
+import { nonStandardAriaProperties } from '../../../helpers/aria.js';
 import {
     attachReportingControlDispatcher,
     detachReportingControlDispatcher,
-    nonStandardAriaProperties,
 } from '../../../helpers/utils.js';
 
 // This test only works if the ARIA reflection polyfill is loaded

@@ -9,8 +9,8 @@ import AttrChanged from 'x/attrChanged';
 import ReflectCamel from 'x/reflectCamel';
 import WithChildElmsHasSlot from 'x/withChildElmsHasSlot';
 import WithChildElmsHasSlotLight from 'x/withChildElmsHasSlotLight';
-import { spyConsole } from '../../../helpers/utils.js';
-import { USE_COMMENTS_FOR_FRAGMENT_BOOKENDS } from '../../../helpers/utils.js';
+import { spyConsole } from '../../../helpers/console.js';
+import { USE_COMMENTS_FOR_FRAGMENT_BOOKENDS } from '../../../helpers/constants.js';
 
 const vFragBookend = USE_COMMENTS_FOR_FRAGMENT_BOOKENDS ? '<!---->' : '';
 

@@ -7,7 +7,7 @@ import PublicPropertiesInheritance from 'x/publicPropertiesInheritance';
 import PublicMethodsInheritance from 'x/publicMethodsInheritance';
 import PrivateAccessors from 'x/privateAccessors';
 import HtmlElementProps from 'x/htmlElementProps';
-import { ariaProperties } from '../../../helpers/utils.js';
+import { ariaProperties } from '../../../helpers/aria.js';
 
 function testInvalidComponentConstructor(name, ctor) {
     it(`should throw for ${name}`, () => {