Upgrade eslint

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:  
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/ci.yml

@@ -7,14 +7,29 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v1
+        uses: actions/checkout@v6
+
+      - uses: actions/setup-node@v6
+        with:
+          node-version: 20
+
+      - name: Cache Yarn cache and node_modules
+        uses: actions/cache@v5
+        with:
+          path: |
+            .yarn/cache
+            node_modules
+          key: ${{ runner.os }}-yarn-${{ hashFiles('yarn.lock') }}
+
       - name: Install dependencies
-        run: yarn install
+        run: yarn install --immutable
+
       - name: Run tests
         run: yarn test
+
       - name: Check for untranspiled TypeScript code
         run: |
-          tsc
+          yarn tsc
           if [ -n "$(git status --porcelain)" ]; then
             echo "Running 'tsc' should not result in any changes. Run 'tsc' before a commit.";
             exit 1

.gitignore

@@ -1,2 +1,16 @@
-node_modules
+# node.js
+#
+node_modules/
+npm-debug.log
+yarn-error.log
+
+# Yarn
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
+# Visual studio
 .vscode

.yarnrc.yml

@@ -0,0 +1,3 @@
+nodeLinker: node-modules
+enableGlobalCache: false
+yarnPath: .yarn/releases/yarn-4.12.0.cjs