Fix dependabot PRs: auto-regenerate yarn.lock and group updates

.github/dependabot.yml

@@ -12,3 +12,48 @@ updates:
     directory: '/'
     schedule:
       interval: 'weekly'
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+    open-pull-requests-limit: 10
+    versioning-strategy: increase
+    cooldown:
+      default-days: 7
+    groups:
+      babel:
+        patterns:
+          - '@babel/*'
+      jupyterlab:
+        patterns:
+          - '@jupyterlab/*'
+          - '@lumino/*'
+      typescript:
+        patterns:
+          - 'typescript'
+          - '@types/*'
+          - 'ts-*'
+      lint-and-format:
+        patterns:
+          - 'eslint*'
+          - '@typescript-eslint/*'
+          - 'prettier*'
+          - 'stylelint*'
+      dev-dependencies:
+        dependency-type: 'development'
+      minor-and-patch:
+        update-types:
+          - 'minor'
+          - 'patch'
+
+  - package-ecosystem: 'npm'
+    directory: '/ui-tests'
+    schedule:
+      interval: 'weekly'
+    open-pull-requests-limit: 5
+    cooldown:
+      default-days: 7
+    groups:
+      ui-tests-deps:
+        patterns:
+          - '*'

.github/workflows/dependabot-lockfile.yml

@@ -0,0 +1,61 @@
+name: Dependabot lockfile fix
+
+on:
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: write
+
+concurrency:
+  group: dependabot-lockfile-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
+jobs:
+  fix-lockfile:
+    if: >-
+      github.event.pull_request.user.login == 'dependabot[bot]' &&
+      startsWith(github.head_ref, 'dependabot/npm_and_yarn/')
+    runs-on: ubuntu-latest
+
+    env:
+      YARN_ENABLE_SCRIPTS: 'false'
+      YARN_ENABLE_IMMUTABLE_INSTALLS: 'false'
+
+    steps:
+      - name: Checkout PR branch
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Setup Node
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
+        with:
+          node-version: '20.x'
+
+      - name: Enable corepack
+        run: corepack enable
+
+      - name: Regenerate root yarn.lock
+        run: yarn install --mode=update-lockfile
+
+      - name: Regenerate ui-tests yarn.lock
+        working-directory: ui-tests
+        run: yarn install --mode=update-lockfile
+
+      - name: Commit and push if changed
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        run: |
+          git config user.name  "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          if [[ -n "$(git status --porcelain)" ]]; then
+            git add yarn.lock ui-tests/yarn.lock
+            git commit -m "Regenerate yarn.lock [dependabot skip]"
+            git remote set-url origin "https://x-access-token:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git"
+            git push
+          else
+            echo "Lockfiles already in sync — nothing to do."
+          fi