How do I find out where an unhandled promise rejection occured?

Question

Quick preface: I understand Promises, I understand resolving and rejection. This is not the question.

(node:14104) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: "callback" argument must be a function
(node:14104) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.\

I understand somewhere in my code a 'callback' argument, which should be a function, isn't. That is also not my question.

How do I find the line of code where the unhandled rejection occurred?

score 9 · Accepted Answer · edited Sep 29 '17 at 16:46

9

node's 'unhandledRejection' event should solve your mystery:

process.on('unhandledRejection', (reason, promise) => {
    console.warn('Unhandled promise rejection:', promise, 'reason:', reason.stack || reason);
});

https://repl.it/I3JJ/2

edited Sep 29 '17 at 16:46

Gyuri

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answered Jun 02 '17 at 12:23

ponury-kostek

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It won't work if a promise was rejected using `reject()` function though. – G07cha Jun 02 '17 at 12:30
Worked like a charm! Thank you. – mikemaccana Jun 02 '17 at 12:35
@mikemaccana You welcome :) – ponury-kostek Jun 02 '17 at 12:35

How do I find out where an unhandled promise rejection occured?

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