Tracking unhandled rejected Promises
In Promise-based asynchronous code, rejections are used for error handling. One risk is that rejections may get lost, leading to silent failures. For example: function main() { asyncFunc() .then(···) .then(() => console.log('Done!')); } If asyncFunc() rejects the Promise it returns then that rejection will never be handled anywhere. Let’s look at how you can track unhandled rejections in browsers
Async Functions - Qiita
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