diff --git a/globals.d.ts b/globals.d.ts
new file mode 100644
index 0000000..34d5ea0
--- /dev/null
+++ b/globals.d.ts
@@ -0,0 +1,9 @@
+declare const THREE: any;
+
+declare interface Document {
+    getElementById(id): any
+}
+
+declare interface Window extends Record<string, any> {
+
+}
diff --git a/index.js b/index.js
index f65257b..abab009 100644
--- a/index.js
+++ b/index.js
@@ -1,3 +1,4 @@
+//@ts-check
 /* global THREE */
 require('./lib/chat')
 
@@ -29,6 +30,7 @@ const mineflayer = require('mineflayer')
 const { WorldView, Viewer } = require('prismarine-viewer/viewer')
 const pathfinder = require('mineflayer-pathfinder')
 const { Vec3 } = require('vec3')
+//@ts-ignore
 global.THREE = require('three')
 const { initVR } = require('./lib/vr')
 
@@ -171,6 +173,7 @@ async function connect (options) {
 
   if (proxy) {
     console.log(`using proxy ${proxy} ${proxyport}`)
+    //@ts-ignore
     net.setProxy({ hostname: proxy, port: proxyport })
   }
 
@@ -291,7 +294,9 @@ async function connect (options) {
 
     function changeCallback () {
       if (document.pointerLockElement === renderer.domElement ||
+        // @ts-ignore
         document.mozPointerLockElement === renderer.domElement ||
+        // @ts-ignore
         document.webkitPointerLockElement === renderer.domElement) {
         document.addEventListener('mousemove', moveCallback, false)
       } else {
diff --git a/package.json b/package.json
index 9c583ce..98b5a5e 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "scripts": {
     "build": "webpack --config webpack.prod.js --progress && node build.js copyFiles",
     "build-dev": "node build.js copyFilesDev && webpack serve --config webpack.dev.js --progress",
-    "start": "node --max-old-space-size=8192 server.js 8080 dev",
+    "start": "NODE_OPTIONS=--max-old-space-size=8192 pnpm build-dev",
     "prod-start": "node server.js",
     "build-dev-start": "npm run build-dev && npm run prod-start",
     "build-start": "npm run build && npm run prod-start",
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..ee49561
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,12 @@
+{
+    "compilerOptions": {
+        "allowJs": true,
+        "allowSyntheticDefaultImports": true,
+        "noEmit": true
+    },
+    "include": [
+        "index.js",
+        "globals.d.ts",
+        "lib"
+    ]
+}