Update types, tests

package.json

@@ -3,9 +3,9 @@
   "version": "3.0.0-beta.0",
   "description": "On-screen Javascript Virtual Keyboard",
   "main": "build/index.js",
-  "types": "build/index.d.ts",
+  "types": "build/types/index.d.ts",
   "scripts": {
-    "start": "webpack serve",
+    "start": "webpack serve --config webpack.config.demo.js",
     "build": "webpack && tsc",
     "test": "jest --silent",
     "coverage": "npm run test -- --coverage",
@@ -45,17 +45,23 @@
     "@babel/plugin-transform-typescript": "^7.13.0",
     "@babel/polyfill": "^7.12.1",
     "@babel/preset-env": "^7.13.9",
+    "@types/jest": "^26.0.20",
     "@typescript-eslint/eslint-plugin": "^4.16.1",
     "@typescript-eslint/parser": "^4.16.1",
+    "autoprefixer": "^10.2.5",
     "babel-eslint": "^10.1.0",
     "babel-loader": "^8.2.2",
     "babel-preset-minify": "^0.5.0",
+    "core-js": "^3.9.1",
     "css-loader": "^5.1.1",
     "eslint": "^7.21.0",
     "file-loader": "^6.2.0",
+    "html-webpack-plugin": "^5.3.0",
     "jest": "^26.6.3",
     "mini-css-extract-plugin": "^1.3.9",
     "optimize-css-assets-webpack-plugin": "^5.0.4",
+    "postcss": "^8.2.8",
+    "postcss-loader": "^5.2.0",
     "prettier": "^2.2.1",
     "prettier-webpack-plugin": "^1.2.0",
     "style-loader": "^2.0.0",
@@ -74,6 +80,7 @@
       "src/**/*.{js,jsx,ts,tsx}",
       "!src/**/*.d.ts",
       "!src/lib/index.js",
+      "!src/lib/polyfills.js",
       "!src/demo/index.js",
       "!src/utils/**",
       "!src/**/*.d.ts",