Targeting ES5 with TypeScript in Visual Studio

This has changed with TypeScript 0.8.2. You now change TypeScriptTarget in the .csproj file from:

<TypeScriptTarget>ES3</TypeScriptTarget>

to

<TypeScriptTarget>ES5</TypeScriptTarget>

MyApp.csproj:

  <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
    <TypeScriptTarget>ES5</TypeScriptTarget>
    <TypeScriptIncludeComments>true</TypeScriptIncludeComments>
    <TypeScriptSourceMap>true</TypeScriptSourceMap>
    <TypeScriptModuleKind>AMD</TypeScriptModuleKind>
  </PropertyGroup>

  <PropertyGroup Condition="'$(Configuration)' == 'Release'">
    <TypeScriptTarget>ES5</TypeScriptTarget>
    <TypeScriptIncludeComments>false</TypeScriptIncludeComments>
    <TypeScriptSourceMap>false</TypeScriptSourceMap>
    <TypeScriptModuleKind>AMD</TypeScriptModuleKind>
  </PropertyGroup>

See also Asher Barak answer