diff --git a/package-lock.json b/package-lock.json
index 0a8b6ccd..18eb8e39 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6464,6 +6464,11 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
+    "typescript": {
+      "version": "3.3.3333",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.3.3333.tgz",
+      "integrity": "sha512-JjSKsAfuHBE/fB2oZ8NxtRTk5iGcg6hkYXMnZ3Wc+b2RSqejEqTaem11mHASMnFilHrax3sLK0GDzcJrekZYLw=="
+    },
     "ua-parser-js": {
       "version": "0.7.18",
       "resolved": "https://registry.npmjs.org/ua-parser-js/-/ua-parser-js-0.7.18.tgz",
diff --git a/package.json b/package.json
index 36784e15..6b112f74 100644
--- a/package.json
+++ b/package.json
@@ -6,14 +6,14 @@
   "module": "./dist/yjs.mjs'",
   "sideEffects": false,
   "scripts": {
-    "test": "npm run lint && npm run dist && node ./dist/tests.js --repitition-time 50",
+    "test": "npm run lint && npm run dist &&",
     "test-exhaustive": "npm run lint && npm run dist && node ./dist/tests.js --repitition-time 10000",
     "dist": "rm -rf dist examples/build && rollup -c",
     "watch": "rollup -wc",
-    "lint": "standard",
+    "lint": "standard && tsc",
     "docs": "rm -rf docs; jsdoc --configure ./.jsdoc.json --verbose --readme ./README.v13.md --package ./package.json || true",
     "serve-docs": "npm run docs && serve ./docs/",
-    "postversion": "PRODUCTION=1 npm run dist",
+    "postversion": "npm run lint && PRODUCTION=1 npm run dist && node ./dist/tests.js --repitition-time 1000",
     "debug": "concurrently 'live-server --port=3443 --entry-file=test.html' 'npm run watch'",
     "trace-deopt": "clear && rollup -c  && node --trace-deopt dist/test.js",
     "trace-opt": "clear && rollup -c  && node --trace-opt dist/test.js"
@@ -52,6 +52,9 @@
     "url": "https://github.com/y-js/yjs/issues"
   },
   "homepage": "http://y-js.org",
+  "dependencies": {
+    "lib0": "0.0.0"
+  },
   "devDependencies": {
     "codemirror": "^5.42.0",
     "concurrently": "^3.6.1",
@@ -71,9 +74,7 @@
     "rollup-plugin-node-resolve": "^4.0.0",
     "rollup-plugin-terser": "^4.0.4",
     "standard": "^11.0.1",
-    "tui-jsdoc-template": "^1.2.2"
-  },
-  "dependencies": {
-    "lib0": "0.0.0"
+    "tui-jsdoc-template": "^1.2.2",
+    "typescript": "^3.3.3333"
   }
 }
diff --git a/tsconfig.json b/tsconfig.json
index 98c6f8af..0fa098ba 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -55,5 +55,6 @@
     // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
     // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
     "maxNodeModuleJsDepth": 5
-  }
+  },
+  "files": ["./src/index.js"]
 }