migrate to yarn 3

.gitignore

@@ -104,3 +104,11 @@ typings/
 .dotrun.json
 
 dist
+
+# yarn
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions

.yarnrc.yml

@@ -0,0 +1,3 @@
+nodeLinker: node-modules
+
+yarnPath: .yarn/releases/yarn-3.2.1.cjs

package.json

@@ -20,5 +20,6 @@
     "typescript": "^3.8.3",
     "webpack": "^4.42.0",
     "webpack-cli": "^3.3.11"
-  }
+  },
+  "packageManager": "yarn@3.2.1"
 }