[17:35:58] <jwbth>	 Hello
[17:36:06] <jwbth>	 https://noc.wikimedia.org/conf/InitialiseSettings.php.txt contains the following:
[17:36:12] <jwbth>	 'wgNamespacesToPostIn' => [
[17:36:38] <jwbth>	 This way we know that on metawiki that in metawiki you can post in the main namespace
[17:36:57] <jwbth>	 The question is: is there a way to pick up this setting on client side, in JavaScript?
[18:03:41] <bd808>	 jwbth: that setting does not seem to be exposed by the mw.config javascript object right now. But it is also only used by Special:MassMessage. Is your js code automating that somehow?
[18:06:40] <bd808>	 There is an onMakeGlobalVariablesScript hook that Extension:MassMessage could use to expose some/all of its settings to the client in js if it has high value.
[18:07:33] <bd808>	 or the ResourceLoaderGetConfigVars hook could be used too since this is site wide state and not page specific
[18:07:54] <bd808>	 but both would take php code changes