January 2026 maintenance

.github/dependabot.yml

@@ -1,8 +1,8 @@
 version: 2
 updates:
-- package-ecosystem: npm
-  directory: "/"
-  schedule:
-    interval: monthly
-    time: "07:00"
-  open-pull-requests-limit: 10
+  - package-ecosystem: npm
+    directory: '/'
+    schedule:
+      interval: monthly
+      time: '07:00'
+    open-pull-requests-limit: 10

.github/workflows/build-lambda-function.yml

@@ -1,22 +1,27 @@
 name: Build Lambda function
-on: workflow_dispatch
+on:
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
 
 jobs:
   tsc:
     name: Compile TypeScript
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout code
+        uses: actions/checkout@v6
       - name: Enable corepack
         run: corepack enable
       - name: Use Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
-          node-version: 22
+          node-version: 24
           cache: yarn
       - name: Compile TypeScript
         run: scripts/build-lambda-grader.sh
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: build-lambda
           path: build.tar.bz2
@@ -25,17 +30,18 @@ jobs:
     name: Build native modules
     needs: tsc
     runs-on: ubuntu-latest
-    container: amazon/aws-lambda-nodejs:22
+    container: amazon/aws-lambda-nodejs:24
     steps:
       - name: install git and tar
         run: yum install -y git tar bzip2 zip
-      - uses: actions/checkout@v4
-      - uses: actions/download-artifact@v3
+      - name: Checkout code
+        uses: actions/checkout@v6
+      - uses: actions/download-artifact@v4
         with:
           name: build-lambda
       - name: Rebuild native modules
         run: scripts/build-lambda-grader-in-docker.sh
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: graderzip
           path: grader.zip

.github/workflows/build-xvfb-layer.yml

@@ -1,16 +1,21 @@
 name: Build layer
-on: workflow_dispatch
+on:
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
 
 jobs:
   xvfb:
     name: Build Xvfb
     runs-on: ubuntu-latest
-    container: amazon/aws-lambda-nodejs:22
+    container: amazon/aws-lambda-nodejs:24
     steps:
-      - uses: actions/checkout@v4
+      - name: Checkout code
+        uses: actions/checkout@v6
       - name: Build Xvfb
         run: scripts/build-lambda-xvfb.sh
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           name: xvfbzip
           path: /opt/xvfb.zip

.github/workflows/ci.yml

@@ -0,0 +1,110 @@
+name: Run CI
+
+permissions:
+  contents: read
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  format-check:
+    name: Check code formatting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+      - name: Enable corepack
+        run: corepack enable
+      - name: Use Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 24
+          cache: yarn
+
+      - name: Install dependencies
+        run: yarn install --immutable
+
+      - name: Check formatting
+        run: yarn format:check
+
+  typecheck:
+    name: TypeScript type checking
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Enable corepack
+        run: corepack enable
+
+      - name: Use Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 24
+          cache: yarn
+
+      - name: Install dependencies
+        run: yarn install --immutable
+
+      - name: Run type checker
+        run: yarn typecheck
+
+  test:
+    name: Run tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Enable corepack
+        run: corepack enable
+
+      - name: Use Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 24
+          cache: yarn
+
+      - name: Install dependencies
+        run: yarn install --immutable
+
+      - name: Run tests
+        run: yarn test
+
+      - name: Upload coverage to Coveralls
+        if: github.event_name == 'push' && github.ref == 'refs/heads/master'
+        uses: coverallsapp/github-action@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+  build:
+    name: Build project
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Enable corepack
+        run: corepack enable
+
+      - name: Use Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 24
+          cache: yarn
+
+      - name: Install dependencies
+        run: yarn install --immutable
+
+      - name: Build TypeScript
+        run: yarn build
+
+      - name: Verify build output
+        run: |
+          test -f build/index.js || (echo "Build failed: index.js not found" && exit 1)
+          echo "Build successful!"

.gitignore

@@ -2,3 +2,6 @@ node_modules/
 *.map
 build/
 grader.zip
+
+# Yarn
+.yarn/install-state.gz

.node-version

@@ -1 +1 @@
-22.14.0
+24.12.0

.prettierrc → .prettierrc.json

@@ -2,7 +2,5 @@
   "semi": false,
   "singleQuote": true,
   "printWidth": 100,
-  "parser": "typescript",
-  "trailingComma": "none",
   "arrowParens": "avoid"
 }

.vscode/extensions.json

@@ -0,0 +1,3 @@
+{
+  "recommendations": ["esbenp.prettier-vscode"]
+}

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+  "editor.formatOnSave": true,
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "files.insertFinalNewline": true
+}

.yarnrc.yml

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