VS 2015 Update 3 Clean deletes .js files it shouldn't

[Layoric]

TypeScript Version: 1.8.35

When trying to create an Angular 2 application using JSPM, I could run the application once and then after a Visual Studio rebuild, JSPM could not located Reflect.js from reflect-metadata. It seems that on clean/rebuild action, the Reflect.js file was being deleted.

I believe this is due to Reflect.ts being included in the NPM package and VS/TypeScript matching the two names on clean and deleting the Reflect.js file even though the jspm_packages folder is being excluded in the tsconfig.json. If I change the Reflect.ts file to Reflect_.ts the Reflect.js file is left untouched. This problem also doesn't occur when the package is installed to node_modules via NPM.

Below is my tsconfig.json.

{
  "compileOnSave":  true,
  "compilerOptions": {
    "noImplicitAny": false,
    "noEmitOnError": true,
    "removeComments": false,
    "sourceMap": true,
    "target": "es5",
    "module": "commonjs",
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "moduleResolution": "node"
  },
  "exclude": [
    "jspm_packages",
    "typings",
    "node_modules",
    "wwwroot"
  ]
}

I've disabled ReSharper in case that was the cause but can still replicate the issue.

Code
I've created a minimal example project with VS 2015 highlighting the issue.

https://github.com/Layoric/VSTypeScriptIssueExampleProject

Running after initial NPM install and VS build should show.

Stopping and running a clean/rebuild will run again but not display lower text message and in the web console. Errors will show that JSPM can't find Reflect.js file.

Expected behavior:
Visual Studio 2015 adheres to tsconfig.json exclude for both build action as well as clean.
Actual behavior:
When cleaning a project, .js files with matching .ts files that are within directories listed in tsconfig.json exclude array are deleted.

My setup is:
Windows 7
Visual Studio 2015 Update 3
TypeScript 1.8.35
Node 4.2.2
NPM 3.8.3
JSPM 0.16.33 (global)

Let me know if any other info is required 👍

[Layoric]

Tested this issue with TypeScript 2.0 beta VS extension and it doesn't occur, so seems this will resolve itself once TS 2.0 is released. 👍

[oferAshkenazy]

happing to me VS 2015 angular 2 rc6
have you found any work around?
Thanks

[Layoric]

@oferAshkenazy Sadly no, basically work around is to install TypeScript 2.0 beta extension Visual Studio Extension. Direct download link is in the linked blog post.

[BaamAadmi]

I have a similar issue, where reflect.js file gets edited/checked-out and gives error as
Error: (SystemJS) IsNull is not defined
DecorateConstructor@http://localhost:3000/node_modules/reflect-metadata/Reflect.js:523:44

I use npm and in my tsconfig I added this,
"exclude": [
"node_modules/*"
]
So, Ideally it should not bother any of the files in that area. To workaround this, I had to undo the reflect.js file.

Installed typescript plugin and it is not giving that error so far.

Thanks for your help @Layoric .