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FWIW, VS Code has "inlay hints" added in August 2021 which provide one solution to this problem: https://i.imgur.com/1NUmYON.png

Webstorm has inlay hints. I’ve been waiting for VS Code to add them.

They are not ideal in webstorm. Sometimes they make lines run off the page, and they are a bit jarring the way they appear and disappear.