Fix issue with trying to compile JS that was transpiled from JS already. These shouldn’t be looked at. Also, only if there is external JS should the allowJs option be used.

Script/AtomicEditor/hostExtensions/languageExtensions/TypescriptLanguageExtension.ts

@@ -77,6 +77,7 @@ export default class TypescriptLanguageExtension implements Editor.HostExtension
     private buildTsConfig(): any {
         // only build out a tsconfig.atomic if we actually have typescript files in the project
         let projectFiles: Array<string> = [];
+        let hasJsFiles = false;
         const slashedProjectPath = Atomic.addTrailingSlash(ToolCore.toolSystem.project.projectPath);
 
         //scan all the files in the project for any typescript files and add them to the project
@@ -101,7 +102,12 @@ export default class TypescriptLanguageExtension implements Editor.HostExtension
         let compilerOptions = defaultCompilerOptions;
         Atomic.fileSystem.scanDir(ToolCore.toolSystem.project.resourcePath, "*.js", Atomic.SCAN_FILES, true).forEach(filename => {
             let fn = Atomic.addTrailingSlash(ToolCore.toolSystem.project.resourcePath) + filename;
-            projectFiles.push(Atomic.addTrailingSlash(ToolCore.toolSystem.project.resourcePath) + filename);
+            // if the .js file matches up to a .ts file already loaded, then skip it
+            let tsfn = filename.replace("\.js$", ".ts");
+            if (projectFiles.indexOf(tsfn) == -1) {
+                hasJsFiles = true;
+                projectFiles.push(fn);
+            }
         });
 
         // First we need to load in a copy of the lib.es6.d.ts that is necessary for the hosted typescript compiler
@@ -157,6 +163,9 @@ export default class TypescriptLanguageExtension implements Editor.HostExtension
         // set the base url
         compilerOptions["baseUrl"] = ToolCore.toolSystem.project.resourcePath;
 
+        // enable JS files in the TS Compiler if we have js files
+        compilerOptions.allowJs = hasJsFiles;
+
         let tsConfig = {
             compilerOptions: compilerOptions,
             files: projectFiles