Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

In TypeScript, string constants are valid types. Here's an screenshot from the syntax highlighting in VSCode:

Contrast with the syntax highlighting in the most recent version of chroma:

Note that the syntax error with the comma was resolved in #1002.

To Reproduce

type T<U> = Complicated<U, "stuff">
//                         ^-----^
//    not highlighted as a literal

playground link