chore: use yarn 3

.github/workflows/main.yml

@@ -16,9 +16,9 @@ jobs:
         with:
           repository: svg/svgo
           path: .svgo
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
           cache: 'yarn'
       - run: yarn install --immutable
       - run: yarn run build

.gitignore

@@ -19,6 +19,15 @@ npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
 
+# https://yarnpkg.com/getting-started/qa#which-files-should-be-gitignored
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
 # Docs should be pulled from the svg/svgo repository
 /docs/
 /.svgo/

.yarnrc.yml

@@ -0,0 +1,3 @@
+nodeLinker: node-modules
+
+yarnPath: .yarn/releases/yarn-3.8.2.cjs

package.json

@@ -1,4 +1,5 @@
 {
+  "packageManager": "[email protected]",
   "name": "svgo-dev",
   "version": "0.0.0",
   "description": "Landing page and documentation for SVGO.",