core: use with import attributes for legacy-javascript, bump to node 18.20

.github/workflows/ci.yml

@@ -29,10 +29,10 @@ jobs:
         GITHUB_CONTEXT_PR_BASE_SHA: ${{ github.event.pull_request.base.sha }}
         GITHUB_CONTEXT_BASE_SHA: ${{ github.event.before }}
 
-    - name: Use Node.js 18.x
+    - name: Use Node.js 18.20
       uses: actions/setup-node@v4
       with:
-        node-version: 18.x
+        node-version: '18.20'
 
     - run: yarn install --frozen-lockfile --network-timeout 1000000
     - run: yarn type-check

.github/workflows/cron-weekly.yml

@@ -31,10 +31,10 @@ jobs:
     steps:
     - name: git clone
       uses: actions/checkout@v4
-    - name: Use Node.js 18.x
+    - name: Use Node.js 18.20
       uses: actions/setup-node@v4
       with:
-        node-version: 18.x
+        node-version: '18.20'
     - run: yarn --frozen-lockfile
 
     - run: yarn mocha --testMatch=third-party/chromium-synchronization/*-test.js

.github/workflows/devtools.yml

@@ -25,10 +25,10 @@ jobs:
       with:
         path: lighthouse
 
-    - name: Use Node.js 18.x
+    - name: Use Node.js 18.20
       uses: actions/setup-node@v4
       with:
-        node-version: 18.x
+        node-version: '18.20'
 
     - name: Generate cache hash
       run: bash $GITHUB_WORKSPACE/lighthouse/.github/scripts/generate-devtools-hash.sh > cdt-test-hash.txt
@@ -91,10 +91,10 @@ jobs:
       with:
         path: lighthouse
 
-    - name: Use Node.js 18.x
+    - name: Use Node.js 18.20
       uses: actions/setup-node@v4
       with:
-        node-version: 18.x
+        node-version: '18.20'
 
     - run: yarn --frozen-lockfile --network-timeout 1000000
       working-directory: ${{ github.workspace }}/lighthouse
@@ -141,10 +141,10 @@ jobs:
       with:
         path: lighthouse
 
-    - name: Use Node.js 18.x
+    - name: Use Node.js 18.20
       uses: actions/setup-node@v4
       with:
-        node-version: 18.x
+        node-version: '18.20'
 
     - name: Load build artifacts
       id: devtools-build-artifacts

.github/workflows/package-test.yml

@@ -19,10 +19,10 @@ jobs:
     - name: git clone
       uses: actions/checkout@v4
 
-    - name: Use Node.js 18.x
+    - name: Use Node.js 18.20
       uses: actions/setup-node@v4
       with:
-        node-version: 18.x
+        node-version: '18.20'
 
     - run: yarn install --frozen-lockfile --network-timeout 1000000
     - run: yarn build-report

.github/workflows/publish.yml

@@ -31,7 +31,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 18.x
+          node-version: '18.20'
           registry-url: https://registry.npmjs.org/
       - run: yarn --frozen-lockfile
 

.github/workflows/smoke.yml

@@ -36,10 +36,10 @@ jobs:
         # Depth of at least 2 for codecov coverage diffs. See https://github.com/GoogleChrome/lighthouse/pull/12079
         fetch-depth: 2
 
-    - name: Use Node.js 18.x
+    - name: Use Node.js 18.20
       uses: actions/setup-node@v4
       with:
-        node-version: 18.x
+        node-version: '18.20'
 
     # Since Ubuntu 23, dev builds of Chromium need this.
     # https://chromium.googlesource.com/chromium/src/+/main/docs/security/apparmor-userns-restrictions.md
@@ -98,10 +98,10 @@ jobs:
       uses: actions/checkout@v4
 
     # Use Node 18 here earlier than everywhere else, see https://github.com/GoogleChrome/lighthouse/issues/15160#issuecomment-1589913408
-    - name: Use Node.js 18.x
+    - name: Use Node.js 18.20
       uses: actions/setup-node@v4
       with:
-        node-version: 18.x
+        node-version: '18.20'
 
     - name: Define ToT chrome path
       run: echo "CHROME_PATH=${env:GITHUB_WORKSPACE}\.tmp\chrome-tot\chrome.exe" | Out-File -FilePath $Env:GITHUB_ENV -Encoding utf-8 -Append
@@ -146,10 +146,10 @@ jobs:
     - name: git clone
       uses: actions/checkout@v4
 
-    - name: Use Node.js 18.x
+    - name: Use Node.js 18.20
       uses: actions/setup-node@v4
       with:
-        node-version: 18.x
+        node-version: '18.20'
 
     - run: yarn install --frozen-lockfile --network-timeout 1000000
     - run: yarn build-report

.github/workflows/unit.yml

@@ -106,10 +106,10 @@ jobs:
     - name: git clone
       uses: actions/checkout@v4
 
-    - name: Use Node.js 18.x
+    - name: Use Node.js 18.20
       uses: actions/setup-node@v4
       with:
-        node-version: 18.x
+        node-version: '18.20'
 
     - run: yarn install --frozen-lockfile --network-timeout 1000000
     - run: yarn build-report

core/lib/legacy-javascript/legacy-javascript.js

@@ -15,21 +15,14 @@
 /** @typedef {{name: string, line: number, column: number}} PatternMatchResult */
 /** @typedef {{matches: PatternMatchResult[], estimatedByteSavings: number}} Result */
 
-import fs from 'fs';
-
-import {LH_ROOT} from '../../../shared/root.js';
-
-const polyfillModuleDataJson = fs.readFileSync(
-  `${LH_ROOT}/core/lib/legacy-javascript/polyfill-module-data.json`, 'utf-8');
+import polyfillModuleData_ from './polyfill-module-data.json' with { type: 'json' };
+import graph_ from './polyfill-graph-data.json' with { type: 'json' };
 
 /** @type {import('../../scripts/legacy-javascript/create-polyfill-module-data.js').PolyfillModuleData} */
-const polyfillModuleData = JSON.parse(polyfillModuleDataJson);
-
-const graphJson = fs.readFileSync(
-  `${LH_ROOT}/core/lib/legacy-javascript/polyfill-graph-data.json`, 'utf-8');
+const polyfillModuleData = polyfillModuleData_;
 
 /** @type {import('../../scripts/legacy-javascript/create-polyfill-size-estimation.js').PolyfillSizeEstimator} */
-const graph = JSON.parse(graphJson);
+const graph = graph_;
 
 /**
  * Takes a list of patterns (consisting of a name identifier and a RegExp expression string)

docs/headless-chrome.md

@@ -5,7 +5,7 @@
 Setup:
 
 ```sh
-# Lighthouse requires Node 18 LTS (18.x) or later.
+# Lighthouse requires Node 18.20 or later.
 curl -sL https://deb.nodesource.com/setup_18.x | sudo -E bash - &&\
 sudo apt-get install -y nodejs npm
 

package.json

@@ -10,7 +10,7 @@
     "smokehouse": "./cli/test/smokehouse/frontends/smokehouse-bin.js"
   },
   "engines": {
-    "node": ">=18.16"
+    "node": ">=18.20"
   },
   "scripts": {
     "prepack": "yarn build-report --standalone --flow --esm && yarn build-types",

readme.md

@@ -53,7 +53,7 @@ The Chrome extension was available prior to Lighthouse being available in Chrome
 The Node CLI provides the most flexibility in how Lighthouse runs can be configured and reported. Users who want more advanced usage, or want to run Lighthouse in an automated fashion should use the Node CLI.
 
 > **Note**
-> Lighthouse requires Node 18 LTS (18.x) or later.
+> Lighthouse requires Node 18.20 or later.
 
 **Installation**:
 

tsconfig-base.json

@@ -12,7 +12,7 @@
     "rootDir": ".",
 
     "target": "es2022",
-    "module": "es2022",
+    "module": "preserve",
     "moduleResolution": "node",
     "esModuleInterop": true,
 

tsconfig.json

@@ -25,6 +25,7 @@
     "core/test/fixtures/unresolved-perflog.json",
     "core/test/fixtures/traces/lcp-m78.devtools.log.json",
     "core/lib/legacy-javascript/polyfill-graph-data.json",
+    "core/lib/legacy-javascript/polyfill-module-data.json",
     "shared/localization/locales/en-US.json",
   ],
   "exclude": [