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> Esbuild [...] works well only if your code and dependencies use ESM

I cannot attest to that. We are using Esbuild plus CJS at $DAYJOB no problem. Why would that be an issue?

It's an issue because CommonJS allows stuff that's forbidden in static ESM imports/exports, and it was normal to use. Newer code is usually fine, but there are many older backend libraries that can cause issues with Esbuild. Webpack had to learn how to deal with it because it existed at the time CommonJS was most popular, Esbuild didn't.

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