chore: upgrade Yarn and Node.js to latest version

Closes patternfly#9959

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

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

@@ -14,14 +14,18 @@ runs:
     - name: Set up Node.js
       uses: actions/setup-node@v4
       with:
-        node-version: 18
+        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

@@ -130,7 +130,7 @@ To make contributing components and packages easier a generator utility has been
 
 To start the generator run:
 
-```bash
+```sh
 yarn generate
 ```
 
@@ -179,9 +179,9 @@ Please ensure that all React UI components contributed meet the following guidel
 
 Adhering to the following process is the best way to get your work included in the project:
 
-1.  [Fork](https://help.github.com/fork-a-repo/) the project, clone your fork, and configure the remotes:
+1. [Fork](https://help.github.com/fork-a-repo/) the project, clone your fork, and configure the remotes:
 
-```bash
+```sh
 # Clone your fork of the repo into the current directory
 git clone https://github.com/<your-username>/patternfly-react.git
 # Navigate to the newly cloned directory
@@ -192,15 +192,24 @@ git remote add upstream https://github.com/patternfly/patternfly-react.git
 git fetch upstream
 ```
 
-2.  Create a branch:
+2. Set up tooling
 
-```text
-$ git checkout -b my-branch upstream/main
+[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
+yarn build
 ```
 
-3. Generate your component
+3.  Create a branch:
+
+```sh
+git checkout -b my-branch upstream/main
+```
 
-```bash
+4. Generate your component
+
+```sh
 # Run the tool to Generate the component scaffolding
  yarn generate
 ```
@@ -214,37 +223,37 @@ $ git checkout -b my-branch upstream/main
     ComponentName.md - Component Docs
   ```
 
-4.  Develop your component. After development is complete, run build and ensure tests and lint standards pass.
+5.  Develop your component. After development is complete, run build and ensure tests and lint standards pass.
 
-```text
-$ yarn build
-$ yarn test
+```sh
+yarn build
+yarn test
 ```
 
 Ensure no lint errors are introduced in `yarn-error.log` after running this command.
 
 ***Note to Windows users:*** you may need to change the path for the lint script in package.json to be `node_modules/eslint/bin/eslint`
 
-5.  Add a commit using `git commit`:
+6.  Add a commit using `git commit`:
 
 This project uses [`lerna`](https://lernajs.io/) to do automatic releases and generate a changelog based on the commit history. So we follow [a convention][3] for commit messages. Please follow this convention for your commit messages.
 
-6.  Rebase
+7.  Rebase
 
 Use `git rebase` (not `git merge`) to sync your work from time to time. Ensure all commits related to a single issue have been [squashed](https://github.com/ginatrapani/todo.txt-android/wiki/Squash-All-Commits-Related-to-a-Single-Issue-into-a-Single-Commit).
 
-```text
-$ git fetch upstream
-$ git rebase upstream/main
+```sh
+git fetch upstream
+git rebase upstream/main
 ```
 
-7.  Push
+8.  Push
 
-```text
-$ git push origin my-branch
+```sh
+git push origin my-branch
 ```
 
-8.  Create a pull request
+9.  Create a pull request
 
 [Open a pull request](https://help.github.com/articles/using-pull-requests/) with a clear title and description against the `main` branch. Please be sure to include all of the following in your PR:
 

README.md

@@ -44,8 +44,8 @@ Before you begin, check out this [overview of PatternFly](http://patternfly.org/
 #### Install a package manager
 Install a package manager before using the PatternFly libraries.
 
-* [Use npm](https://nodejs.org/en/download)
-* [Use Yarn](https://yarnpkg.com/en/docs/getting-started)
+* [Use npm](https://nodejs.org/en/download/package-manager)
+* [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": ">=18.0.0",
-    "yarn": ">=1.6.0"
+    "node": ">=20"
   },
+  "packageManager": "yarn@4.1.1",
   "keywords": [
     "react",
     "patternfly",
@@ -111,6 +111,5 @@
     "packages": [
       "packages/**"
     ]
-  },
-  "dependencies": {}
+  }
 }

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

@@ -1,7 +1,6 @@
 {
   "name": "eslint-plugin-patternfly-react",
   "version": "5.4.0-prerelease.0",
-  "private": false,
   "main": "./lib/index.js",
   "license": "MIT",
   "publishConfig": {

packages/react-charts/README.md

@@ -2,21 +2,6 @@
 
 This package provides PatternFly charting components for [PatternFly][patternfly].
 
-### Prerequisite
-
-#### Node Environment 
-
-This project currently supports Node [Active LTS](https://github.com/nodejs/Release#release-schedule) releases. Please stay current with Node Active LTS when developing patternfly-react.
-
-For example, to develop with Node 8, use the following:
-
-```
-nvm install 8
-nvm use 8
-```
-
-This project also requires a Yarn version of >=1.6.0. The latest version can be installed [here](https://yarnpkg.com/).
-
 ### Installing
 
 ```

packages/react-code-editor/README.md

@@ -2,21 +2,6 @@
 
 This package provides a PatternFly wrapper for the Monaco code editor, using the `@monaco-editor/react` package.
 
-### Prerequisite
-
-#### Node Environment
-
-This project currently supports Node [Active LTS](https://github.com/nodejs/Release#release-schedule) releases. Please stay current with Node Active LTS when developing patternfly-react.
-
-For example, to develop with Node 18, use the following:
-
-```
-nvm install 18
-nvm use 18
-```
-
-This project also requires a Yarn version of >=1.6.0. The latest version can be installed [here](https://yarnpkg.com/).
-
 ### Installing
 
 ```

packages/react-core/CONTRIBUTING.md

@@ -66,8 +66,6 @@ $ git checkout -b my-branch -t upstream/main
 
 While developing, you can run the patternfly-react workspace to view the component docs with live examples.
 
-**Note:** Be sure you are using node version >= 18.0.0
-
 ```bash
 # Start up the workspace locally on port 8002
  yarn install && yarn start

packages/react-table/README.md

@@ -2,21 +2,6 @@
 
 This package provides Table PatternFly components based on [PatternFly][patternfly]
 
-### Prerequisite 
-
-#### Node environment
-
-This project currently supports Node [Active LTS](https://github.com/nodejs/Release#release-schedule) releases. Please stay current with Node Active LTS when developing patternfly-react.
-
-For example, to develop with Node 18, use the following:
-
-```
-nvm install 18
-nvm use 18
-```
-
-This project also requires a Yarn version of >=1.6.0. The latest version can be installed [here](https://yarnpkg.com/).
-
 ### Installing
 
 ```

packages/react-templates/README.md

@@ -2,21 +2,6 @@
 
 This package provides wrapped Patternfly component demos with a streamlined API for ease of use.
 
-### Prerequisite
-
-#### Node Environment
-
-This project currently supports [Node Active LTS](https://github.com/nodejs/Release#release-schedule) releases. Please stay current with Node Active LTS when developing patternfly-react.
-
-For example, to develop with Node 18, use the following:
-
-```
-nvm install 18
-nvm use 18
-```
-
-This project also requires a Yarn version of >=1.6.0. The latest version can be installed from the [Yarn](https://yarnpkg.com/) home page.
-
 ### Installing
 
 ```