Upgrading typescript

Author: jamesdaniels

package.json

@@ -96,7 +96,7 @@
     "systemjs": "^0.19.16",
     "systemjs-builder": "^0.15.7",
     "traceur": "0.0.96",
-    "typescript": "^3.1.6 <3.2"
+    "typescript": ">=3.4.0 <3.5.0"
   },
   "typings": "index.d.ts"
 }

yarn.lock

@@ -8586,12 +8586,7 @@ typescript@1.8.10:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-1.8.10.tgz#b475d6e0dff0bf50f296e5ca6ef9fbb5c7320f1e"
   integrity sha1-tHXW4N/wv1DyluXKbvn7tccyDx4=
 
-"typescript@^3.1.6 <3.2":
-  version "3.1.6"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.1.6.tgz#b6543a83cfc8c2befb3f4c8fba6896f5b0c9be68"
-  integrity sha512-tDMYfVtvpb96msS1lDX9MEdHrW4yOuZ4Kdc4Him9oU796XldPYF/t2+uKoX0BBa0hXXwDlqYQbXY5Rzjzc5hBA==
-
-typescript@^3.3.3333:
+"typescript@>=3.4.0 <3.5.0", typescript@^3.3.3333:
   version "3.4.5"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.5.tgz#2d2618d10bb566572b8d7aad5180d84257d70a99"
   integrity sha512-YycBxUb49UUhdNMU5aJ7z5Ej2XGmaIBL0x34vZ82fn3hGvD+bgrMrVDpatgz2f7YxUMJxMkbWxJZeAvDxVe7Vw==