chore: release 8.16.1

.github/workflows/unit.yml

@@ -66,6 +66,8 @@ jobs:
               run: yarn test:types
             - name: Run unit tests
               run: yarn test:ci
+            - name: Run unit tests in production mode
+              run: yarn test:production --no-watch
             - name: Upload unit test coverage report
               uses: actions/upload-artifact@v4
               with:

package.json

@@ -1,6 +1,6 @@
 {
     "name": "lwc-monorepo",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "private": true,
     "description": "Lightning Web Components",
     "repository": {
@@ -19,6 +19,7 @@
         "copy-fork": "./scripts/tasks/unsafe-external-contributor-ci-workaround.sh",
         "dev": "nx run-many --target=dev --all --parallel=999 --exclude=@lwc/perf-benchmarks,@lwc/perf-benchmarks-components,@lwc/integration-tests",
         "test": "vitest --workspace vitest.workspace.mjs",
+        "test:production": "VITE_NODE_ENV=production vitest --workspace vitest.workspace.mjs",
         "test:bespoke": "nx run-many --target=test",
         "test:debug": "vitest --workspace vitest.workspace.mjs --inspect-brk --no-file-parallelism",
         "test:ci": "vitest run --workspace vitest.workspace.mjs --coverage",

packages/@lwc/aria-reflection/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/aria-reflection",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "ARIA element reflection polyfill for strings",
     "keywords": [
         "aom",

packages/@lwc/babel-plugin-component/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/babel-plugin-component",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "Babel plugin to transform a LWC module",
     "keywords": [
         "lwc"
@@ -47,8 +47,8 @@
     },
     "dependencies": {
         "@babel/helper-module-imports": "7.25.9",
-        "@lwc/errors": "8.16.0",
-        "@lwc/shared": "8.16.0",
+        "@lwc/errors": "8.16.1",
+        "@lwc/shared": "8.16.1",
         "line-column": "~1.0.2"
     },
     "devDependencies": {

packages/@lwc/compiler/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/compiler",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "LWC compiler",
     "keywords": [
         "lwc"
@@ -52,11 +52,11 @@
         "@babel/plugin-transform-class-properties": "7.25.9",
         "@babel/plugin-transform-object-rest-spread": "7.25.9",
         "@locker/babel-plugin-transform-unforgeables": "0.22.0",
-        "@lwc/babel-plugin-component": "8.16.0",
-        "@lwc/errors": "8.16.0",
-        "@lwc/shared": "8.16.0",
-        "@lwc/ssr-compiler": "8.16.0",
-        "@lwc/style-compiler": "8.16.0",
-        "@lwc/template-compiler": "8.16.0"
+        "@lwc/babel-plugin-component": "8.16.1",
+        "@lwc/errors": "8.16.1",
+        "@lwc/shared": "8.16.1",
+        "@lwc/ssr-compiler": "8.16.1",
+        "@lwc/style-compiler": "8.16.1",
+        "@lwc/template-compiler": "8.16.1"
     }
 }

packages/@lwc/engine-core/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/engine-core",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "Core LWC engine APIs.",
     "keywords": [
         "lwc"
@@ -46,9 +46,9 @@
         }
     },
     "dependencies": {
-        "@lwc/features": "8.16.0",
-        "@lwc/shared": "8.16.0",
-        "@lwc/signals": "8.16.0"
+        "@lwc/features": "8.16.1",
+        "@lwc/shared": "8.16.1",
+        "@lwc/signals": "8.16.1"
     },
     "devDependencies": {
         "observable-membrane": "2.0.0"

packages/@lwc/engine-core/src/framework/check-version-mismatch.ts

@@ -38,7 +38,12 @@ export function checkVersionMismatch(
 ) {
     const versionMatcher = func.toString().match(LWC_VERSION_COMMENT_REGEX);
     if (!isNull(versionMatcher) && !warned) {
-        if (typeof process === 'object' && process.env.SKIP_LWC_VERSION_MISMATCH_CHECK === 'true') {
+        if (
+            typeof process === 'object' &&
+            typeof process?.env === 'object' &&
+            process.env &&
+            process.env.SKIP_LWC_VERSION_MISMATCH_CHECK === 'true'
+        ) {
             warned = true; // skip printing out version mismatch errors when env var is set
             return;
         }

packages/@lwc/engine-dom/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/engine-dom",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "Renders LWC components in a DOM environment.",
     "keywords": [
         "lwc"
@@ -46,9 +46,9 @@
         }
     },
     "devDependencies": {
-        "@lwc/engine-core": "8.16.0",
-        "@lwc/shared": "8.16.0",
-        "@lwc/features": "8.16.0"
+        "@lwc/engine-core": "8.16.1",
+        "@lwc/shared": "8.16.1",
+        "@lwc/features": "8.16.1"
     },
     "lwc": {
         "modules": [

packages/@lwc/engine-dom/src/formatters/__tests__/component.spec.ts

@@ -15,7 +15,7 @@ import {
 import { LOWEST_API_VERSION } from '@lwc/shared';
 
 // it needs to be imported from the window, otherwise the checks for associated vms is done against "@lwc/engine-core"
-const LightningElementFormatter = (globalThis as any)['devtoolsFormatters'].find((f: any) => {
+const LightningElementFormatter = (globalThis as any)['devtoolsFormatters']?.find((f: any) => {
     return f.name === 'LightningElementFormatter';
 });
 
@@ -33,8 +33,9 @@ class WireAdapter {
     disconnect() {}
 }
 
-describe('Lightning Element formatter', () => {
-    const { header } = LightningElementFormatter;
+// LightningElementFormatter is not exposed in prod mode
+describe.skipIf(process.env.NODE_ENV === 'production')('Lightning Element formatter', () => {
+    const header = LightningElementFormatter?.header;
 
     it('should not contain body', () => {
         expect(LightningElementFormatter.hasBody()).toBe(false);

packages/@lwc/engine-server/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/engine-server",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "Renders LWC components in a server environment.",
     "keywords": [
         "lwc"
@@ -46,10 +46,10 @@
         }
     },
     "devDependencies": {
-        "@lwc/engine-core": "8.16.0",
-        "@lwc/rollup-plugin": "8.16.0",
-        "@lwc/shared": "8.16.0",
-        "@lwc/features": "8.16.0",
+        "@lwc/engine-core": "8.16.1",
+        "@lwc/rollup-plugin": "8.16.1",
+        "@lwc/shared": "8.16.1",
+        "@lwc/features": "8.16.1",
         "@rollup/plugin-virtual": "^3.0.2",
         "parse5": "^7.2.1"
     }

packages/@lwc/engine-server/src/__tests__/fixtures.spec.ts

@@ -13,6 +13,7 @@ import { testFixtureDir, formatHTML, pluginVirtual } from '@lwc/test-utils-lwc-i
 import { setFeatureFlagForTest } from '../index';
 import type { LightningElementConstructor } from '@lwc/engine-core/dist/framework/base-lightning-element';
 import type { RollupLwcOptions } from '@lwc/rollup-plugin';
+import type { FeatureFlagName } from '@lwc/features/dist/types';
 
 vi.mock('lwc', async () => {
     const lwcEngineServer = await import('../index');
@@ -33,6 +34,9 @@ interface FixtureConfig {
 
     /** Props to provide to the root component. */
     props?: Record<string, string>;
+
+    /** Feature flags to enable for the test. */
+    features: FeatureFlagName[];
 }
 
 async function compileFixture({
@@ -162,7 +166,8 @@ function testFixtures(options?: RollupLwcOptions) {
     );
 }
 
-describe.concurrent('fixtures', () => {
+// TODO [#5134]: Enable these tests in production mode
+describe.skipIf(process.env.NODE_ENV === 'production').concurrent('fixtures', () => {
     beforeAll(() => {
         // ENABLE_WIRE_SYNC_EMIT is used because this mimics the behavior for LWR in SSR mode. It's also more reasonable
         // for how both `engine-server` and `ssr-runtime` behave, which is to use sync rendering.

packages/@lwc/errors/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/errors",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "LWC Error Utilities",
     "keywords": [
         "lwc"

packages/@lwc/features/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/features",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "LWC Features Flags",
     "keywords": [
         "lwc"
@@ -46,6 +46,6 @@
         }
     },
     "dependencies": {
-        "@lwc/shared": "8.16.0"
+        "@lwc/shared": "8.16.1"
     }
 }

packages/@lwc/integration-karma/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@lwc/integration-karma",
     "private": true,
-    "version": "8.16.0",
+    "version": "8.16.1",
     "scripts": {
         "start": "KARMA_MODE=watch karma start ./scripts/karma-configs/test/local.js",
         "test": "karma start ./scripts/karma-configs/test/local.js --single-run --browsers ChromeHeadless",
@@ -21,11 +21,11 @@
         "karma-sauce-launcher-fix-firefox": "using a fork to work around https://github.com/karma-runner/karma-sauce-launcher/issues/275"
     },
     "devDependencies": {
-        "@lwc/compiler": "8.16.0",
-        "@lwc/engine-dom": "8.16.0",
-        "@lwc/engine-server": "8.16.0",
-        "@lwc/rollup-plugin": "8.16.0",
-        "@lwc/synthetic-shadow": "8.16.0",
+        "@lwc/compiler": "8.16.1",
+        "@lwc/engine-dom": "8.16.1",
+        "@lwc/engine-server": "8.16.1",
+        "@lwc/rollup-plugin": "8.16.1",
+        "@lwc/synthetic-shadow": "8.16.1",
         "@types/jasmine": "^5.1.6",
         "chokidar": "^4.0.3",
         "istanbul-lib-coverage": "^3.2.2",

packages/@lwc/integration-tests/package.json

@@ -1,7 +1,7 @@
 {
     "name": "@lwc/integration-tests",
     "private": true,
-    "version": "8.16.0",
+    "version": "8.16.1",
     "scripts": {
         "build": "node scripts/build.js",
         "build:dev": "MODE=dev yarn build",
@@ -18,7 +18,7 @@
         "sauce:prod:ci": "MODE=prod yarn build:prod && MODE=prod ../../../scripts/ci/retry.sh wdio ./scripts/wdio.sauce.conf.js"
     },
     "devDependencies": {
-        "@lwc/rollup-plugin": "8.16.0",
+        "@lwc/rollup-plugin": "8.16.1",
         "@wdio/cli": "^9.9.1",
         "@wdio/local-runner": "^9.9.1",
         "@wdio/mocha-framework": "^9.9.0",
@@ -27,7 +27,7 @@
         "@wdio/static-server-service": "^9.9.0",
         "deepmerge": "^4.3.1",
         "dotenv": "^16.4.7",
-        "lwc": "8.16.0",
+        "lwc": "8.16.1",
         "minimist": "^1.2.8",
         "webdriverio": "^9.0.7"
     },

packages/@lwc/integration-types/package.json

@@ -1,16 +1,16 @@
 {
     "name": "@lwc/integration-types",
     "private": true,
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "Type validation for LWC packages",
     "type": "module",
     "scripts": {
         "test": "node ./scripts/update-paths.js --check && tsc",
         "playground": "rollup -c src/playground/rollup.config.js --watch"
     },
     "dependencies": {
-        "@lwc/rollup-plugin": "8.16.0",
-        "lwc": "8.16.0"
+        "@lwc/rollup-plugin": "8.16.1",
+        "lwc": "8.16.1"
     },
     "devDependencies": {
         "@rollup/plugin-replace": "^6.0.2",

packages/@lwc/module-resolver/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/module-resolver",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "Resolves paths for LWC components",
     "keywords": [
         "lwc"

packages/@lwc/perf-benchmarks-components/package.json

@@ -1,12 +1,12 @@
 {
     "name": "@lwc/perf-benchmarks-components",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "private": true,
     "scripts": {
         "build": "rm -fr dist && rollup -c ./rollup.config.mjs"
     },
     "devDependencies": {
-        "@lwc/rollup-plugin": "8.16.0"
+        "@lwc/rollup-plugin": "8.16.1"
     },
     "nx": {
         "targets": {

packages/@lwc/perf-benchmarks/package.json

@@ -1,6 +1,6 @@
 {
     "name": "@lwc/perf-benchmarks",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "private": true,
     "scripts": {
         "build": "rm -fr dist && rollup -c  ./rollup.config.mjs && node scripts/build.js && ./scripts/fix-deps.sh",
@@ -15,11 +15,11 @@
         "Don't forget to add these to fix-deps.sh as well."
     ],
     "dependencies": {
-        "@lwc/engine-dom": "8.16.0",
-        "@lwc/engine-server": "8.16.0",
-        "@lwc/perf-benchmarks-components": "8.16.0",
-        "@lwc/ssr-runtime": "8.16.0",
-        "@lwc/synthetic-shadow": "8.16.0"
+        "@lwc/engine-dom": "8.16.1",
+        "@lwc/engine-server": "8.16.1",
+        "@lwc/perf-benchmarks-components": "8.16.1",
+        "@lwc/ssr-runtime": "8.16.1",
+        "@lwc/synthetic-shadow": "8.16.1"
     },
     "devDependencies": {
         "@best/cli": "^14.0.0",

packages/@lwc/rollup-plugin/package.json

@@ -4,7 +4,7 @@
         "You can safely modify dependencies, devDependencies, keywords, etc., but other props will be overwritten."
     ],
     "name": "@lwc/rollup-plugin",
-    "version": "8.16.0",
+    "version": "8.16.1",
     "description": "Rollup plugin to compile LWC",
     "keywords": [
         "lwc"
@@ -46,13 +46,13 @@
         }
     },
     "dependencies": {
-        "@lwc/compiler": "8.16.0",
-        "@lwc/module-resolver": "8.16.0",
-        "@lwc/shared": "8.16.0",
+        "@lwc/compiler": "8.16.1",
+        "@lwc/module-resolver": "8.16.1",
+        "@lwc/shared": "8.16.1",
         "@rollup/pluginutils": "~5.1.4"
     },
     "devDependencies": {
-        "@lwc/errors": "8.16.0"
+        "@lwc/errors": "8.16.1"
     },
     "peerDependencies": {
         "rollup": "^1.2.0||^2.0.0||^3.0.0||^4.0.0"

packages/@lwc/rollup-plugin/src/index.ts

@@ -391,4 +391,6 @@ export default function lwc(pluginOptions: RollupLwcOptions = {}): Plugin {
 }
 
 // For backward compatibility with commonjs format
-module.exports = lwc;
+if (typeof module !== 'undefined') {
+    module.exports = lwc;
+}