Encountering "TS1110 Type expected." error in Visual Studio 2015 when utilizing numeric literal type union alias

Currently, I am using:

Visual Studio 2015
.NET Framework 4.5.2

I have decided to refactor some of my client-side code from JavaScript to TypeScript. Here's how I started the process:

  • Added a .ts file to my web project
  • Let Visual Studio set up itself for compiling TypeScript automatically
  • Installed the jquery.Typescript.DefinitelyTyped Nu-Get package v3.1.2
  • Copied my existing TypeScript code into the new file

Everything seems to be working fine except for one of my type alias declarations. I created a simple example of the error at the beginning of my file to highlight the issue.

https://i.sstatic.net/2Skbe.png

While Visual Studio accepts a string literal type alias, it is having trouble with the numeric literal type alias.

According to Visual Studio, the current version of TypeScript in use is 1.8.36.0.

Answer №1

Version 1.8 of TypeScript does not currently support numeric literal type aliases, only string literal aliases. For more information, you can visit this link.

If you are using Visual Studio 2015, you have the option to update your TypeScript tools to a newer version (although it may not be the latest version available since support has moved on from 2015).

  • Go to Tools > Extensions and Updates...
  • Click on Online
  • In the search bar, enter typescript 3.1.1, which is the most recent version supported by Visual Studio 2015 at this time.
  • After clicking download, follow the prompts in your browser to install the software.
  • Once installed, restart Visual Studio to apply the changes.

To confirm that you are now using the updated version of TypeScript, go to Help > About Microsoft Visual Studio and check the version.

If the installation did not go as expected, you may need to edit the relevant .csproj file and update the TypeScriptToolsVersion from 1.8 to 3.1.

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