Migrate from yarn to pnpm

.github/workflows/ci.yml

@@ -17,17 +17,22 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9.15.4
+
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-          cache: 'yarn'
+          cache: 'pnpm'
 
       - name: Install dependencies
-        run: yarn install --frozen-lockfile
+        run: pnpm install --frozen-lockfile
 
       - name: Build
-        run: yarn build
+        run: pnpm build
 
       - name: Test
-        run: yarn test
+        run: pnpm test

package.json

@@ -65,5 +65,5 @@
       "prettier-plugin-pegjs"
     ]
   },
-  "packageManager": "yarn@1.22.22+sha512.a6b2f7906b721bba3d67d4aff083df04dad64c399707841b7acf00f6b133b7ac24255f2652fa22ae3534329dc6180534e98d17432037ff6fd140556e2bb3137e"
+  "packageManager": "pnpm@9.15.4"
 }