1153421 - Can't return an array from a WebConsoleCommands callback

Status: RESOLVED INVALID

(DevTools :: Console, defect)

Description

[Jeff Griffiths (:canuckistani) (:⚡︎)]

Example add-on https://github.com/canuckistani/console-helpers

I found that I can return simple scalars and also complex objects from the window like document.styleSheets, but when I try to return anything else ( a filtered array containing stylesheet urls grouped by domain, for example ) all I get is an empty object.

Comment 1

[Jeff Griffiths (:canuckistani) (:⚡︎)]

Panos - Brian thought you might have some idea what's going on here.

Comment 2

[Panos Astithas (he/him) [:past] (please ni?)]

My guess is that our security wrappers are not letting you use an array created in chrome-privileged code (add-on code) from content-privileged code. You could use the $x helper as inspiration, which goes through some hoops to avoid this problem:

https://dxr.mozilla.org/mozilla-central/source/toolkit/devtools/webconsole/utils.js#1643

Comment 3

[Jeff Griffiths (:canuckistani) (:⚡︎)]

(In reply to Panos Astithas [:past] from comment #2)
> My guess is that our security wrappers are not letting you use an array
> created in chrome-privileged code (add-on code) from content-privileged
> code. You could use the $x helper as inspiration, which goes through some
> hoops to avoid this problem:
> 
> https://dxr.mozilla.org/mozilla-central/source/toolkit/devtools/webconsole/
> utils.js#1643

Makes sense, thanks.

I also noticed that my code only works on non-e10s windows, and the direct access to the document in the code you linked to probably doesn't help that?

Comment 4

[Nicolas Chevobbe [:nchevobbe]]

I don't think this is relevant anymore