feat: added types

package.json

@@ -7,24 +7,28 @@
   "author": "Tobias Koppers @sokra",
   "homepage": "https://github.com/webpack/webpack-dev-middleware",
   "bugs": "https://github.com/webpack/webpack-dev-middleware/issues",
-  "main": "dist/cjs.js",
   "funding": {
     "type": "opencollective",
     "url": "https://opencollective.com/webpack"
   },
+  "main": "dist/cjs.js",
+  "types": "types/cjs.d.ts",
   "engines": {
     "node": ">= 12.13.0"
   },
   "scripts": {
     "commitlint": "commitlint --from=master",
     "fmt:check": "prettier \"{**/*,*}.{js,json,md,yml,css}\" --list-different",
     "lint:js": "eslint --cache src test",
+    "lint:types": "tsc --pretty --noEmit",
     "lint": "npm-run-all lint:js fmt:check",
     "fmt": "npm run fmt:check -- --write",
     "fix:js": "npm run lint:js -- --fix",
     "fix": "npm-run-all fix:js fmt",
     "prepare": "husky install && npm run build",
-    "build": "del dist && babel src -d dist --copy-files",
+    "build:types": "tsc --declaration --emitDeclarationOnly --outDir types && prettier \"types/**/*.ts\" --write",
+    "build:code": "cross-env NODE_ENV=production babel src -d dist --copy-files",
+    "build": "npm-run-all -p \"build:**\"",
     "release": "standard-version",
     "security": "npm audit --production",
     "test:only": "cross-env NODE_ENV=test jest",
@@ -34,7 +38,8 @@
     "test": "npm run test:coverage"
   },
   "files": [
-    "dist"
+    "dist",
+    "types"
   ],
   "peerDependencies": {
     "webpack": "^4.0.0 || ^5.0.0"
@@ -52,6 +57,9 @@
     "@babel/preset-env": "^7.14.7",
     "@commitlint/cli": "^15.0.0",
     "@commitlint/config-conventional": "^15.0.0",
+    "@types/connect": "^3.4.35",
+    "@types/express": "^4.17.13",
+    "@types/mime-types": "^2.1.1",
     "@webpack-contrib/eslint-config-webpack": "^3.0.0",
     "babel-jest": "^27.0.6",
     "chokidar": "^3.5.1",