Take TS 3.4.1

extensions/package.json

@@ -3,7 +3,7 @@
   "version": "0.0.1",
   "description": "Dependencies shared by all extensions",
   "dependencies": {
-    "typescript": "3.4.0-rc"
+    "typescript": "3.4.1"
   },
   "scripts": {
     "postinstall": "node ./postinstall"

extensions/yarn.lock

@@ -2,7 +2,7 @@
 # yarn lockfile v1
 
 
-typescript@3.4.0-rc:
-  version "3.4.0-rc"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.0-rc.tgz#bc4026c3c517a30fa514b896f2684c6ba92caadb"
-  integrity sha512-wtm2GwuV0Yy2zvmpFaMDtWHnRbzfERi9FLpL+K+JqGkHoclgEQ6TmD1AMxMIjs80NWRIq0Xp1veQyuZbGsUYsg==
+typescript@3.4.1:
+  version "3.4.1"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.1.tgz#b6691be11a881ffa9a05765a205cb7383f3b63c6"
+  integrity sha512-3NSMb2VzDQm8oBTLH6Nj55VVtUEpe/rgkIzMir0qVoLyjDZlnMBva0U6vDiV3IH+sl/Yu6oP5QwsAQtHPmDd2Q==