chore: test on Node 20-26, use a recent yarn berry, bump typescript

- Replace the Node 18 bots with Node 26. Playwright requires Node >=20,
  so every 18.x job was failing while installing `@playwright/test`.
  `engines.node` is bumped to >=20 accordingly.

- Install yarn berry from npm instead of corepack. `yarn init`, which the
  generator runs, is a corepack "transparent command": in a project without a
  `packageManager` field corepack runs its own hardcoded default (4.14.1 today)
  and pins that into the generated project, no matter what
  `corepack prepare yarn@4 --activate` selected. Installing @yarnpkg/cli-dist
  directly makes the generated projects use the yarn we actually installed.

- Skip the yarn-berry step on the Node 22 bots. On Node versions with a broken
  fstat for zip fds, the yarn PnP loader passes the CommonJS source to Node,
  which then loads Playwright through the ESM loader's CommonJS translator,
  where `require.cache` is undefined and loading test files fails with
  "TypeError: Cannot read properties of undefined". Node 22 is in that window
  for the current yarn. To be removed once the fix ships in @playwright/test.

- Bump typescript to 6.0.3 and @types/node to 20.19.43. TypeScript 6 does not
  include @types/* automatically anymore, hence `types: ["node"]`. Dropping
  `include` puts the root playwright.config.ts into the project as well, so it
  is type checked instead of falling back to an inferred config in the editor.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019K5oVK8bNuHCvNVRauYieU

Author: dgozman

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [18.x, 20.x, 22.x, 24.x]
+        node-version: [20.x, 22.x, 24.x, 26.x]
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
     - uses: actions/checkout@v4
@@ -26,6 +26,10 @@ jobs:
     - run: npm run build
     - run: npx tsc --noEmit
     - run: npx playwright test --grep-invert yarn-berry
-    - run: corepack enable
-    - run: corepack prepare yarn@4 --activate
-    - run: npx playwright test --grep yarn-berry
+    # Note: `yarn init` through corepack pins a stale yarn version into the generated project,
+    # so install yarn berry directly instead.
+    # Yarn PnP is broken on Node 22: its loader passes the CommonJS source to Node, and require.cache is undefined.
+    - if: matrix.node-version != '22.x'
+      run: npm i -g --force @yarnpkg/cli-dist@4
+    - if: matrix.node-version != '22.x'
+      run: npx playwright test --grep yarn-berry

.gitignore

@@ -1,3 +1,4 @@
 node_modules/
 lib/
-test-results/
+test-results/
+.vscode

package-lock.json

@@ -11,7 +11,7 @@
     "name": "Microsoft Corporation"
   },
   "engines": {
-    "node": ">=18"
+    "node": ">=20"
   },
   "main": "index.js",
   "bin": {
@@ -28,12 +28,12 @@
   "devDependencies": {
     "@playwright/test": "^1.59.0-alpha-1769819922000",
     "@types/ini": "^4.1.1",
-    "@types/node": "^18.19.33",
+    "@types/node": "^20.19.43",
     "ansi-colors": "^4.1.1",
     "commander": "^14.0.1",
     "enquirer": "^2.3.6",
     "esbuild": "^0.25.0",
     "ini": "^4.1.3",
-    "typescript": "^5.4.5"
+    "typescript": "^6.0.3"
   }
 }

package.json

@@ -1,6 +1,7 @@
 {
   "compilerOptions": {
     "target": "ES2019",
+    "types": ["node"],
     "module": "commonjs",
     "esModuleInterop": true,
     "strict": true,
@@ -13,6 +14,5 @@
     "noUncheckedIndexedAccess": true
   },
   "compileOnSave": true,
-  "include": ["src", "tests", "assets"],
-  "exclude": ["assets/playwright-ct.config.ts", "assets/playwright-ct.config.js"]
+  "exclude": ["node_modules", "lib", "test-results", "assets/playwright-ct.config.ts", "assets/playwright-ct.config.js"]
 }