upgrade tstl (#67)

Author: Perryvw

package-lock.json

@@ -35,7 +35,7 @@
         "react-json-tree": "^0.15.0",
         "react-monaco-editor": "^0.43.0",
         "stream-browserify": "^3.0.0",
-        "typescript-to-lua": "^0.41.0"
+        "typescript-to-lua": "0.42.0"
     },
     "devDependencies": {
         "@ark120202/typescript-config": "^2.2.0",

package.json

@@ -10,6 +10,7 @@ require("path").format = (x: any) => x;
 
 const libContext = require.context(`raw-loader!typescript-to-lua/dist/lualib`, true, /(.+)(?<!lualib_bundle)\.lua$/);
 const emitHost: tstl.EmitHost = {
+    directoryExists: () => false,
     fileExists: (fileName) => ts.sys.fileExists(fileName),
     getCurrentDirectory: () => "",
     readFile: (fileName: string) => {