Errors arose due to the deployment of TypeScript decorators

Using TypeScript in a brand new ASP.NET Core project has brought some challenges.

We are actively incorporating decorators into our codebase.

However, this integration is causing numerous errors to appear in the output of VS2015:

Error   TS1219  Experimental support for decorators is a feature that is subject to change in a future release.
Specify '--experimentalDecorators' to remove this warning.  
WebApplication2 d:\documents\visual studio 2015\Projects\WebApplication2\src\WebApplication2\wwwroot\sources\app.ts 9   Active

There are solutions available for removing these error messages when working with regular ASP.NET projects by modifying the *.csproj file.

However, ASP.NET Core projects utilize the .xproj file structure instead.

So, how can we enable experimental TypeScript decorator support in VS2015 for an ASP.NET Core project?

You can access a simple project showcasing this issue on a sample github repository

typescriptvisual-studio-2015asp.net-core

Answer №1

  1. To get started, right click on your project and select Add then choose New Item.
  2. From the menu on the left, choose Client-side.
  3. Now, add a new file called 
    TypeScript JSON Configuration File
    with the default name of tsconfig.json.
  4. Next, open up the tsconfig.json file, locate the complierOptions section, and include "experimentalDecorators": true.
  5. Don't forget to remove "wwwroot" from the "exclude" section.
  6. Once you've made these changes, build your project and enjoy!

For reference, here is the content of my tsconfig.json file:

{
  "compilerOptions": {
    "noImplicitAny": false,
    "noEmitOnError": true,
    "removeComments": false,
    "sourceMap": true,
    "target": "es5",
    "experimentalDecorators": true
  },
  "exclude": [
    "node_modules"
  ]
}

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