A `promise.done()` method that throws if it receives a rejected promise has
been discussed, but the consensus seems to be that browsers instead should
report on rejected unhandled promises that are garbage collected. This is
already implemented in Firefox (at least in the DevTools edition), where
You might try reading through some of the previous threads that talk
about the trickiness of surfacing promise errors in the general case.
Unfortunately these threads usually devolve into an endless thread of
discussion and debate that become next to impossible to actually read
through later
Awhile back I did my best to summarize some of the previous es-discuss
threads on a related GitHub thread:
https://github.com/iojs/io.js/issues/11#issuecomment-65971175
Please see the immediately following comment as well for some clarification
on how Bluebird surfaces unhandled rejections.
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