Upgrade Yarn to Yarn Berry (v2) (#430)

* Upgrade Yarn to Yarn Berry (v2)

* Add missing workspace, fix link to parent lib

.gitignore

@@ -2,6 +2,9 @@
 .cache
 .idea
 .vscode
+.yarn/*
+!.yarn/releases
+!.yarn/plugins
 dist
 coverage
 node_modules

.yarnrc.yml

@@ -0,0 +1,3 @@
+nodeLinker: node-modules
+
+yarnPath: .yarn/releases/yarn-2.2.2.cjs

package.json

@@ -5,7 +5,13 @@
   "main": "dist/umd/index.js",
   "module": "dist/esm/index.js",
   "source": "src/index.js",
-  "sideEffects": ["*.css"],
+  "sideEffects": [
+    "*.css"
+  ],
+  "workspaces": [
+    ".",
+    "test"
+  ],
   "scripts": {
     "build": "yarn build-js-all && yarn copy-styles && yarn build-styles",
     "build-js-all": "yarn build-js-esm && yarn build-js-umd",

test/package.json

@@ -4,8 +4,8 @@
   "description": "A test page for React-Calendar.",
   "private": true,
   "scripts": {
-    "build": "parcel build index.html --public-url ./",
-    "start": "parcel index.html"
+    "build": "NODE_ENV=production webpack",
+    "start": "NODE_ENV=development webpack-dev-server"
   },
   "author": {
     "name": "Wojciech Maj",
@@ -16,7 +16,7 @@
     "@wojtekmaj/date-utils": "^1.0.2",
     "prop-types": "^15.6.2",
     "react": "^16.5.0",
-    "react-calendar": "latest",
+    "react-calendar": "portal:../",
     "react-dom": "^16.5.0"
   },
   "devDependencies": {