diff --git a/package.json b/package.json
index d35fbcdc..1fcdad87 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,6 @@
   "devDependencies": {
     "@babel/core": "^7.9.0",
     "@polkadot/dev": "^0.51.8",
-    "@polkadot/ts": "^0.3.14",
     "@polkadot/typegen": "^1.9.0-beta.11",
     "@types/jest": "^25.1.4",
     "copy-webpack-plugin": "^5.1.1",
diff --git a/packages/extension/src/extensionizer.d.ts b/packages/extension/src/extensionizer.d.ts
new file mode 100644
index 00000000..e981108c
--- /dev/null
+++ b/packages/extension/src/extensionizer.d.ts
@@ -0,0 +1,11 @@
+// Copyright 2019-2020 @polkadot/extension authors & contributors
+// This software may be modified and distributed under the terms
+// of the Apache-2.0 license. See the LICENSE file for details.
+
+/// <reference types="chrome"/>
+
+declare module 'extensionizer' {
+  const extensionizer: typeof chrome;
+
+  export default extensionizer;
+}
diff --git a/tsconfig.json b/tsconfig.json
index fcf097bc..3a27ba42 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -21,10 +21,6 @@
       "@polkadot/extension-ui": ["packages/extension-ui/src"],
       "@polkadot/extension-ui/*": ["packages/extension-ui/src/*"]
     },
-    "skipLibCheck": true,
-    "typeRoots": [
-      "./node_modules/@polkadot/ts",
-      "./node_modules/@types"
-    ]
+    "skipLibCheck": true
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 0c820a3a..0c070cab 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3049,15 +3049,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@polkadot/ts@npm:^0.3.14":
-  version: 0.3.14
-  resolution: "@polkadot/ts@npm:0.3.14"
-  dependencies:
-    "@types/chrome": ^0.0.101
-  checksum: 2/957242a557833596bbf1a94e4a9340be1bb6152a33aeac1ae94eef20e5380c9af1b41719b2943d96da7019478c09756192b74fc5bb0b7ee5f2fd60d977fe6f23
-  languageName: node
-  linkType: hard
-
 "@polkadot/typegen@npm:^1.9.0-beta.11":
   version: 1.9.0-beta.11
   resolution: "@polkadot/typegen@npm:1.9.0-beta.11"
@@ -3313,15 +3304,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/chrome@npm:^0.0.101":
-  version: 0.0.101
-  resolution: "@types/chrome@npm:0.0.101"
-  dependencies:
-    "@types/filesystem": "*"
-  checksum: 2/ad3906874fa0ef3d5921a5d3b56830cef9d03e286b9c475fd6fa6330ddc105873b7626eb6d7112192471e702e5b86563471b6fbc9152fd2209bbf6c0c88a980b
-  languageName: node
-  linkType: hard
-
 "@types/color-name@npm:^1.1.1":
   version: 1.1.1
   resolution: "@types/color-name@npm:1.1.1"
@@ -17245,7 +17227,6 @@ __metadata:
   dependencies:
     "@babel/core": ^7.9.0
     "@polkadot/dev": ^0.51.8
-    "@polkadot/ts": ^0.3.14
     "@polkadot/typegen": ^1.9.0-beta.11
     "@types/jest": ^25.1.4
     copy-webpack-plugin: ^5.1.1