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New warnings should indicate origin #861

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floross opened this issue Nov 9, 2015 · 5 comments
Closed

New warnings should indicate origin #861

floross opened this issue Nov 9, 2015 · 5 comments
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@floross
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@floross floross commented Nov 9, 2015

The new warnings introduces by bluebird 3 are quite handy to avoid bugs, but the error they refer to can be quite hard to pinpoint in large codebases:

Warning: a promise was created in a  handler but was not returned from it
at processImmediate [as _immediateCallback] (timers.js:367:17)

In my case this was due to the use of old-style callbacks that didn't return anything, but maybe Bluebird could somewhat use the longStackTrace mechanism to indicate the origin of the error to facilitate debugging.

@petkaantonov
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@petkaantonov petkaantonov commented Nov 9, 2015

There should be a long stack trace as this warning is not even enabled if long stack traces are not enabled

@floross
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@floross floross commented Nov 10, 2015

Long stack traces are enable but I go the error above anyway.

My bluebird configuration:

Promise.config({
    warnings: true,
    longStackTraces: true,
});
@floross
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@floross floross commented Nov 10, 2015

This code can reproduce the error:

var Promise = require('bluebird');

Promise.config({
    warnings: true,
    longStackTraces: true,
});

Promise.resolve()
    .then(function () {
        Promise.resolve();
    })
;

This warning show up:

Warning: a promise was created in a  handler but was not returned from it
    at processImmediate [as _immediateCallback] (timers.js:367:17)

Ps: I'am currently using the 3.0.5 version of bluebird

@petkaantonov
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@petkaantonov petkaantonov commented Nov 10, 2015

Thanks, I'll look into it

petkaantonov added a commit that referenced this issue Dec 1, 2015
@petkaantonov
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@petkaantonov petkaantonov commented Dec 1, 2015

This was actually bug with Promise.resolve rather than the warning system

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