nodejs/unhandled_promise_trace_warnings.js at 4cafa60c99f0d755b1df3a29357e19a92b97eed8 - nodejs - Smart Yellow Git

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Anna Henningsen 196d27dd8c

promise: better stack traces for --trace-warnings

Give better stack traces for `PromiseRejectionHandledWarning`
and `UnhandledPromiseRejectionWarning`s.

For `PromiseRejectionHandledWarning`, when it is likely that there
is an `Error` object generated, it is created early to provide a
proper stack trace.

For `UnhandledPromiseRejectionWarning`, the stack trace of the
underlying error object is used, if possible.

Fixes: https://github.com/nodejs/node/issues/9523
PR-URL: https://github.com/nodejs/node/pull/9525
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

2016-12-05 18:19:34 +01:00

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JavaScript

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 // Flags: --trace-warnings
 'use strict';
 require('../common');
 const p = Promise.reject(new Error('This was rejected'));
 setImmediate(() => p.catch(() => {}));