Merge pull request #7189 from webpack/feature/update-ts-nightly-version

chore(deps): upgrade TS nightly, fixes from microsoft/TypeScript#23715

Author: TheLarkInn

package.json

@@ -63,7 +63,7 @@
     "simple-git": "^1.65.0",
     "sinon": "^2.3.2",
     "style-loader": "^0.19.1",
-    "typescript": "^2.9.0-dev.20180424",
+    "typescript": "^2.9.0-dev.20180503",
     "url-loader": "^0.6.2",
     "val-loader": "^1.0.2",
     "vm-browserify": "~0.0.0",

yarn.lock

@@ -5807,9 +5807,9 @@ typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
-typescript@^2.9.0-dev.20180424:
-  version "2.9.0-dev.20180426"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.9.0-dev.20180426.tgz#d6b8d31c6b874ccd66d4165fd0e692d2a9e0e972"
+typescript@^2.9.0-dev.20180503:
+  version "2.9.0-dev.20180503"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.9.0-dev.20180503.tgz#26feac2d2120c558fac25b5fe8108a85d0405c4b"
 
 ua-parser-js@^0.7.9:
   version "0.7.17"