Compiling source code

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Unsupported Project Error

Visual Studio shows the following Unsupported message when compiling the project.

After you open the migration report which is displayed after the solution is loaded, you will most likely see the following message.

Solution

Start the repair process for your Microsoft Visual Studio, check the Web Developer Tools in the list of optional components, and finish repairing your IDE.

NewtonSoft.Json Library Missing

When you compile the solution, Visual Studio complains that it cannot find NewtonSoft.Json or other libraries.

Solution

Check if the Enable NuGet Package Restore option is enabled in the solution.

A Feature Supported Only in ECMAScript 6 Error

When you compile the solution, Visual Studio throws several errors saying that certain code works only with ECMAScript 6 or higher.

Solution

Update your TypeScript to version 3.8.2.

Bunch of TypeScript Errors

When you compile the solution, Visual Studio throws a bunch of TypeScript errors.

Solution

Check your TypeScript version:

• In Visual Studio 2015:
  1. In Visual Studio, on the Tools menu, click Extensions and Updates.
  2. In the Installed Tools list, click TypeScript for Microsoft Visual Studio.
  3. Verify that the TypeScript version is 3.8.2.
• Starting from Visual Studio 2017 update 2:
  • Verify that TypeScript 3.8.2 is available in Tools > Options > Text Editor > JavaScript > IntelliSense, in the Use TypeScript version list.

If you have a different version, install TypeScript 3.8.2.