My installation of Visual Studio 2012, VS2012 lost the squiggly and red underline feature.
Here is the small quest to get them back.
1. Go to Tools -> Options
2. In options windows select Text Editor -> C# -> Advanced.
3. Select checkboxes for Underline errors in the editior and Show live semantic errors.
This is a short, how to install TypeScript with Visual Studio 2012. In this example I’ve used the Professional edition.
1. Install the TypeScript plugin for Visual Studio 2012. Download the .msi file from TypeScriptlang.org or go direct to Microsofts page.
2. TypeScript code are compiled to plain JavaScript with the TSC.exe compiler. We wan’t do have this process done automatic. A nice plugin for Visual Studio 2012 is the Web Essentials 2012 who makes the compilation every time a TypeScript file is saved.
3. In Visual Studio, go to Tools -> Extensions and Updates. Select Web Essentials 2012 and download. You probably have to restart Visual Studio.
4. Start to explore and develop with TypeScript.