chore: upgrade Yarn to a supported version

Closes patternfly#9959

Signed-off-by: Jon Koops <jonkoops@gmail.com>

.github/actions/setup-project/action.yml

@@ -17,11 +17,15 @@ runs:
         node-version: 20
         check-latest: true
 
+    - name: Enable Corepack
+      shell: bash
+      run: corepack enable
+
     - name: Get Yarn configuration
       id: yarn-config
       shell: bash
       run: |
-        echo "cache-directory=$(yarn cache dir)" >> $GITHUB_OUTPUT
+        echo "cache-folder=$(yarn config get cacheFolder)" >> $GITHUB_OUTPUT
 
     # TODO: This can be simplified to use the `cache` option of the `actions/setup-node` action when it supports Corepack.
     # See: https://github.com/actions/setup-node/issues/531
@@ -31,14 +35,14 @@ runs:
         # Also cache Cypress binary.
         path: |
           ~/.cache/Cypress
-          ${{ steps.yarn-config.outputs.cache-directory }}
+          ${{ steps.yarn-config.outputs.cache-folder }}
         key: ${{ runner.os }}-yarn-cache-${{ hashFiles('yarn.lock') }}
         restore-keys: |
           ${{ runner.os }}-yarn-cache-
 
     - name: Install dependencies
       shell: bash
-      run: yarn install --frozen-lockfile
+      run: yarn install --immutable
 
     - uses: actions/cache@v4
       if: inputs.skip-build != 'true' && inputs.skip-build-cache != 'true'

.yarnrc.yml

@@ -0,0 +1 @@
+nodeLinker: node-modules

CONTRIBUTING.md

@@ -194,7 +194,7 @@ git fetch upstream
 
 2. Set up tooling
 
-[Install Node.js](https://nodejs.org/en/download/package-manager) version 20 (or higher). Then install the project dependencies and build it by running:
+[Install Node.js](https://nodejs.org/en/download/package-manager) version 20 (or higher), and make sure to [enable Corepack](https://nodejs.org/api/corepack.html). Then install the project dependencies and build it by running:
 
 ```sh
 yarn install

README.md

@@ -45,7 +45,7 @@ Before you begin, check out this [overview of PatternFly](http://patternfly.org/
 Install a package manager before using the PatternFly libraries.
 
 * [Use npm](https://nodejs.org/en/download/package-manager)
-* [Use Yarn](https://yarnpkg.com/en/docs/getting-started)
+* [Use Yarn](https://yarnpkg.com/getting-started/install)
 
 
 #### Start with PatternFly React seed

package.json

@@ -8,9 +8,9 @@
     "url": "https://github.com/patternfly/patternfly-react.git"
   },
   "engines": {
-    "node": ">=20",
-    "yarn": ">=1.6.0"
+    "node": ">=20"
   },
+  "packageManager": "yarn@4.2.2+sha512.c44e283c54e02de9d1da8687025b030078c1b9648d2895a65aab8e64225bfb7becba87e1809fc0b4b6778bbd47a1e2ab6ac647de4c5e383a53a7c17db6c3ff4b",
   "keywords": [
     "react",
     "patternfly",
@@ -38,6 +38,7 @@
     "@testing-library/react": "^16.0.0",
     "@testing-library/user-event": "^14.5.2",
     "@types/jest": "29.5.12",
+    "@types/node": "^20.12.7",
     "@types/react": "^18",
     "@types/react-dom": "^18",
     "@typescript-eslint/eslint-plugin": "^5.62.0",
@@ -86,7 +87,7 @@
     "clean:build": "rimraf .cache .eslintcache coverage",
     "clean:exports": "lerna run clean:exports --parallel --stream",
     "generate": "yarn plop",
-    "lint": "node --max-old-space-size=4096 node_modules/.bin/eslint --ext js,jsx,ts,tsx --cache --cache-strategy content",
+    "lint": "eslint --ext js,jsx,ts,tsx --cache --cache-strategy content",
     "lint:all": "yarn lint:md && yarn lint:versions && yarn lint:ts",
     "lint:md": "yarn eslint packages --ext md --no-eslintrc --config .eslintrc-md.json --cache --cache-strategy content",
     "lint:ts": "yarn lint packages/*/src",
@@ -119,6 +120,5 @@
     "packages": [
       "packages/**"
     ]
-  },
-  "dependencies": {}
+  }
 }

packages/eslint-plugin-patternfly-react/package.json

@@ -1,7 +1,6 @@
 {
   "name": "eslint-plugin-patternfly-react",
   "version": "5.4.0-prerelease.3",
-  "private": false,
   "main": "./lib/index.js",
   "license": "MIT",
   "publishConfig": {

packages/react-core/src/components/Nav/__tests__/Generated/NavList.test.tsx

@@ -1,7 +1,7 @@
 import React from 'react';
 
 import { render } from '@testing-library/react';
-import * as ReactCoreUtils from '@patternfly/react-core/src/helpers/util';
+import * as ReactCoreUtils from '../../../../helpers/util';
 
 import { NavList } from '../../NavList';
 import { NavContext } from '../../Nav';

packages/react-core/src/components/TextInput/__tests__/TextInput.test.tsx

@@ -5,7 +5,7 @@ import userEvent from '@testing-library/user-event';
 
 import { TextInput, TextInputBase } from '../TextInput';
 import { ValidatedOptions } from '../../../helpers/constants';
-import * as ReactCoreUtils from '@patternfly/react-core/src/helpers/util';
+import * as ReactCoreUtils from '../../../helpers/util';
 
 const props = {
   onChange: jest.fn(),

packages/react-integration/demo-app-ts/package.json

@@ -16,8 +16,8 @@
     "react-router-dom": "^5.3.4"
   },
   "devDependencies": {
-    "@types/react-router-dom": "^5.3.3",
     "@types/react-router": "^5.1.20",
+    "@types/react-router-dom": "^5.3.3",
     "@vitejs/plugin-react-swc": "^3.7.0",
     "vite": "^5.2.12"
   }

packages/react-integration/package.json

@@ -25,7 +25,7 @@
     "cypress:open": "cypress open",
     "cypress:run": "cypress run",
     "serve:integration": "cd demo-app-ts && yarn preview",
-    "test:integration": "node --max-old-space-size=4096 ./node_modules/.bin/cypress run"
+    "test:integration": "cypress run"
   },
   "devDependencies": {
     "cypress": "^8.7.0",