Sourcemaps are not generated for dependencies with snowpack dev server

[iki]

Steps to reproduce:

• npx create-snowpack-app test --template @snowpack/app-template-react-typescript
• cd test
• npm i firebase
• add import 'firebase'; to index.tsx
• npm start
• open devtools in browser => DevTools failed to load SourceMap: Could not load content for http://localhost:8080/web_modules/index.esm.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

[gr2m]

I was not able to reproduce the problem, here are the versions I got when I followed your instructions.

✗ npm ls snowpack firebase
/private/var/folders/hs/x9qtfmvn1lz1sgml9q21h7k80000gn/T/tmp.pSthfSpm/test
├── firebase@7.19.0 
└── snowpack@2.9.0 

Can you try to run npx snowpack dev --reload and see if that resolves the problem for you?