Visual Studio not displaying compile time errors in editor

Question

For example, when I write:

string x = \"turtle\";
x.Go();

There is no red squiggly line detecting the absence of the Go() method on String.

Answer 1

JavaScript Type Checking Sometimes type checking your JavaScript code can help you spot mistakes you might have not caught otherwise. You can run the TypeScript type checker against your existing JavaScript code by simply adding a // @ts-check comment to the top of your file.

// @ts-nocheck 

let easy = true;
easy = 42;

Tip: You can also enable the checks workspace or application wide by adding "javascript.implicitProjectConfig.checkJs": true to your workspace or user settings and explicitly ignoring files or lines using // @ts-nocheck and // @ts-ignore. Check out the docs on JavaScript in VS Code to learn more.

Answer 2

I had the same issue and had SP1 installed and had Underline errors in the editor and Show live semantic errors checked in VS2008's options.

My solution was to download Microsoft Visual Studio 2008 Service Pack 1 (Installer) and re-install the package. It wasn't classified as a 'repair' or a 're-install' despite the fact it was already installed, but it worked.