Admittedly more of an IntelliJ question. When using IntelliJ for Rust & TypeScript together, I run into the following choices:
open Rust and TypeScript in same window: weird, requires specific directory structure
open Rust and TypeScript in different IntelliJ windows: often get confused on whether I'm editing Rust workspace or TypeScript workspace
Anyone else running into this issue when doing Rust / TypeScript interop in IntelliJ, and if so, how are you solving it ? [I'm half tempted to use VSCode for TypeScript, IntelliJ for Rust just to get easy separation]
I'm not sure if IntelliJ supports having different themes active in different windows, but you could switch your Rust window to have a orange-ish theme like Solarized Light and the TypeScript window could use a blue-ish theme like Solarized Dark.
That way you'd be able to tell immediately because of the window's background colour.