Warning: a promise was rejected with a non-error: [object Error]

A warning is fired when I reject a Promise with an new Error('...'), but Promise and Error are from different Window 's (e.g. window.opener and window child - from window.open or iframe.contentWindow).

Of cource, it means, that rejectReason instanceof Error returns false, because Error is instance of iframe.contentWindow.Error (not of window.Error)

[mjomble]

I’m also getting the “promise was rejected with a non-error” warning for regular new Error(...) type errors when the code runs inside PhantomJS with Bluebird 3.x.

It worked fine with Bluebird 2.9.x

[atifsyedali]

The only warning suppression flag I see there is for when you forget to return a promise.

wForgottenReturn is the only warning type that can be separately configured. The corresponding environmental variable key is BLUEBIRD_W_FORGOTTEN_RETURN.

Maybe I am missing something? In any case, I only get the warning on startup when es6-shim tries to initialize and test the features supported by the Promise impl in the env. See https://github.com/paulmillr/es6-shim/blob/8583cbe2186ec12bfbf4218ccbce7fc73f96de87/es6-shim.js#L2654

I’ll suppress this myself so no worries. Just wanted to know if there is a way to turn it off already.