What is the Typescript compiler utilized by Visual Studio 2015 when compiling on save?

Currently using Visual Studio 2015 Update 3 with TypeScript 2 for VS installed. I have a basic ASP.NET Core MVC web application with a few simple TypeScript files. The project contains a tsconfig.json file in the root folder with "compileOnSave": true.

I have multiple versions of TypeScript (1.0, 1.7, 1.8, and 2.0) installed on my PC at C:\Program Files (x86)\Microsoft SDKs\TypeScript

When I save a TypeScript file, it is correctly compiled into a JavaScript file with the same name. Even if I delete the generated JavaScript files and build the project again, the TypeScript files are compiled successfully.

If I change the directory name from "C:\Program Files (x86)\Microsoft SDKs\TypeScript" to "C:\Program Files (x86)\Microsoft SDKs\TypeScript.bak", making the TypeScript compilers inaccessible, I receive an error during project build as expected. However, saving a TypeScript file still triggers auto-compilation even without the compiler available.

Given these conditions, how does Visual Studio locate the TypeScript compiler to enable compile on save functionality?

typescriptvisual-studio-2015compilation

Answer №1

When working with Visual Studio, the projects csproj file plays a crucial role in determining which version of TypeScript to utilize. By opening this file in an editor, you can easily locate the tag TypeScriptToolsVersion to identify the specific version being used by your project.

In my case, the version appears as follows:

<TypeScriptToolsVersion>2.0.6</TypeScriptToolsVersion>

Subsequently, Visual Studio will search for a corresponding folder matching this version number (in this scenario, 2.0) within the directory C:\Program Files (x86)\Microsoft SDKs\TypeScript. Within this designated folder, the compiler executable tsc.exe is located and utilized.

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