BREAKING CHANGE: Migrate to Jest and Webpack to be more compatible with Lit 3

.eslintrc

@@ -3,7 +3,8 @@
   "parserOptions": {
     "ecmaFeatures": {
       "jsx": true
-    }
+    },
+	"ecmaVersion": 2018
   },
   "rules": {
       "react/jsx-uses-react": 1,

babel.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+	presets: [
+		"@babel/preset-env", "@babel/preset-react"
+	],
+	plugins: ['babel-plugin-rewire']
+  };

jest.config.js

@@ -0,0 +1,14 @@
+module.exports = {
+	testTimeout: 30000,
+	testEnvironment: "jsdom",
+	transform: {
+		'^.+\\.js$': 'babel-jest',
+	},
+	transformIgnorePatterns: [
+		"node_modules/(?!(\@?lit|lit-html|lit-element|sinon|react-valence-ui-iframe|react-frau-intl)/)"
+	],
+	testPathIgnorePatterns: [
+		"/__tests__/utils/"
+	],
+	moduleFileExtensions: ['js', 'jsx', 'json', 'node']
+  };