he/him 
Is there a JS test framework that will provide a backtrace if a test exceeds a timeout?
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We do that in React test suite with a Babel plugin. https://reactjs.org/blog/2017/12/15/improving-the-repository-infrastructure.html#preventing-infinite-loops …
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Neat! Although this just seems to be for while loops? I’d want to handle more complex cases. From what I’ve seen it’s possible to start a test worker in node debug mode and then use the debug protocol to get a backtrace when it doesn’t respond.
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Chrome inspector, just hit the Source panel’s pause button? In that situation I usually end up on the line of some hot bit of mess doing too much work
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For automatic though I feel like it’d be a hell of a lot of monkeypatching or istanbul-style instrumentation
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Not really. Event loop blocked for 5 seconds, get a backtrace from the process, kill it, then surface it to the user. No prediction or magical heuristics required.
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Hello, got a second to chat. Very important
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