MNT Use yarn 4

Author: emteknetnz

.github/workflows/ci.yml

@@ -10,4 +10,4 @@ jobs:
     name: CI
     # Do not run if this is a pull-request from same repo i.e. not a fork repo
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.repository
-    uses: silverstripe/gha-ci/.github/workflows/ci.yml@v2
+    uses: silverstripe/gha-ci/.github/workflows/ci.yml@v3

.github/workflows/merge-up.yml

@@ -19,4 +19,4 @@ jobs:
       actions: write
     steps:
       - name: Merge-up
-        uses: silverstripe/gha-merge-up@v2
+        uses: silverstripe/gha-merge-up@v3

.github/workflows/update-js.yml

@@ -31,6 +31,6 @@ jobs:
       actions: write
     steps:
       - name: Update JS
-        uses: silverstripe/gha-update-js@v1
+        uses: silverstripe/gha-update-js@v2
         with:
           branch_type: ${{ github.event_name == 'schedule' && 'schedule' || github.event.inputs.branch_type }}

.gitignore

@@ -1,3 +1,4 @@
 .DS_Store
 .sass-cache/
 node_modules/
+/.yarn/

.yarnrc.yml

@@ -0,0 +1,4 @@
+nodeLinker: node-modules
+enableScripts: false
+# Ignore npm versions published less than 7 days ago
+npmMinimalAgeGate: 10080

composer.json

@@ -42,7 +42,7 @@
     "require-dev": {
         "phpunit/phpunit": "^11.3",
         "squizlabs/php_codesniffer": "^3",
-        "silverstripe/documentation-lint": "^1",
+        "silverstripe/documentation-lint": "^2",
         "silverstripe/standards": "^1",
         "phpstan/extension-installer": "^1.3"
     },

package.json

@@ -28,6 +28,7 @@
     "url": "https://github.com/silverstripe/silverstripe-userforms/issues"
   },
   "homepage": "https://github.com/silverstripe/silverstripe-userforms#readme",
+  "packageManager": "yarn@4.18.0+sha512.fcb8716fe7cd0eece141ffc18b92193a9df9204c1ba83189c288835223fc0bbe64af473bab0d5e9927a7daeb5caf2bb07eb2787cc9338ca040ea125f2a1f2f7e",
   "dependencies": {
     "jquery": "^3.6.1",
     "jquery-validation": "^1.19.5",
@@ -37,9 +38,11 @@
     "react-dom": "^18.2.0"
   },
   "devDependencies": {
-    "@silverstripe/eslint-config": "^1.3.0",
+    "@silverstripe/eslint-config": "^2",
     "@silverstripe/webpack-config": "^3",
     "copy-webpack-plugin": "^11.0.0",
+    "eslint": "^8.26.0",
+    "stylelint": "~16.12.0",
     "webpack": "^5.74.0",
     "webpack-cli": "^5.0.0"
   },