TypeScript, the beautiful face of the ugly tapeworm that is JavaScript.  It's the only way to do this stuff.

To add a TypeScript component to a non-TypeScript Visual Studio project, add the following to the end of the project .csproj file (do this in notepad or somesuch; adjust the TypeScript path version accordingly):

	<Target Name="TypeScriptCompile" BeforeTargets="Build">
	<Message Text="Compiling TypeScript files" />
	<Exec Command="&quot;$(MSBuildProgramFiles32)\Microsoft SDKs\TypeScript\1.6\tsc&quot; -target ES5 @(TypeScriptCompile ->'&quot;%(fullpath)&quot;', ' ')" />
	</Target>

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Reload the project and away you go.  When you add TypeScript files to your project, you can set their BuildAction properties to TypeScriptCompile, if this doesn't happen automatically.