add webpack to devDependencies

Closes #243

package.json

@@ -17,8 +17,8 @@
     "typescript"
   ],
   "scripts": {
-    "build": "npx webpack",
-    "prepare": "npx webpack"
+    "build": "webpack",
+    "prepare": "webpack"
   },
   "activationEvents": [
     "onLanguage:javascript",
@@ -626,7 +626,9 @@
     "semver": "^7.3.2",
     "ts-loader": "^8.0.1",
     "vscode-languageserver-protocol": "^3.15.3",
-    "which": "^2.0.2"
+    "which": "^2.0.2",
+    "webpack": "^5.11.0",
+    "webpack-cli": "^4.2.0"
   },
   "dependencies": {
     "typescript": "^4.1.3"