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DX exists and is required, because we, as developers, have created such monstrosities of frameworks and libraries that our authored code is nowhere near what's being run. The stacktrace, a vital tool to the developer, barely exists in "modern web dev".
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Libraries and frameworks have taken us so far away from the original source code that stacktraces and exception lines are completely useless (and they failed to solve it with source maps too). How did we end up accepting this?
