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Browser tests are filing as the bundle file Karma tries to load is not found and frontend tests fail to even start.
It looks like the issue was introduced by #516 and I'm not sure what it aimed to solve since the esbuild generated file is bundle.esm.js, whilst the webpack one was bundle-esm.js (simply bundle.js with this PR.)
I think the file rename was unnecessary, so I've reverted that.
We could also update the karma configuration file to use bundle-esm.js, it fixes the browser tests as well.