After update to Angular 20: Cannot find namespace 'NodeJS'.

[GertrudMathilde]

I'm leaving this here so the next person doesn't have to spend as much time on this as I have...

After I updated to Angular 20, my project wouldn't compile anymore with the error "Cannot find namespace 'NodeJS'."

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Edit: I found out I had a tsconfig.app.json setting "types": [] in the compilerOptions. I don't know why, when or how that got there and why the issue only showed itself after updating to Angular 20. I removed that line and it works (with Angular 21). So all of that below might not be relevant anymore.

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With Angular 20 the moduleResolution in tsconfig was changed from "node" to "bundler".
A workaround is to include "skipLibCheck": true in the compilerOptions.
I found that workaround here: aws-amplify/amplify-ui#6592

Adding /// <reference types="node" /> at the top of esm/index.d.ts worked also.