build: migrate to yarn v4

.github/workflows/lint.yml

@@ -22,5 +22,5 @@ jobs:
         node-version: 20.x
     - name: Lint
       run: |
-        npm install
-        npm run lint
+        yarn install --immutable
+        yarn lint

.github/workflows/test.yml

@@ -20,7 +20,8 @@ jobs:
       uses: actions/setup-node@b39b52d1213e96004bfcb1c61a8a6fa8ab84f3e8  # tag: v4.0.1
       with:
         node-version: 20.x
-    - name: npm install, build, and test
+    - name: yarn install, build, and test
       run: |
-        npm install
-        npm test
+        yarn install --immutable
+        yarn build
+        yarn test

.gitignore

@@ -5,4 +5,5 @@ lib
 .vscode
 .envrc
 coverage
-.DS_Store
+.DS_Store.yarn/install-state.gz
+.yarn/install-state.gz

.yarnrc.yml

@@ -0,0 +1,10 @@
+enableScripts: false
+
+nodeLinker: node-modules
+
+npmMinimalAgeGate: 10080
+
+npmPreapprovedPackages:
+  - "@electron/*"
+
+yarnPath: .yarn/releases/yarn-4.10.3.cjs