Thanks for taking the time to review these Brion. I will fix every one of
them. I am still curious though: how can it only occur some of the time? A
static script shall always run the same way, no?

On Fri, May 19, 2017 at 7:35 PM, Brion Vibber <[email protected]> wrote:

> Also check your user JS; this looks like it may be yours and looks like it
> would cause this kind of err:
>
> https://fa.wikipedia.org/wiki/%DA%A9%D8%A7%D8%B1%D8%A8%D8%
> B1:Huji/vector.js
>
> $(function () {
> ...
>
>    var y = mw.util.addPortletLink('p-cactions', url+"&section=0",
> 'ویرایش لید', 'ca-edit-0',
>                           'ویرایش بخش آغازین صفحه', 'ویرایش لید',
> x.nextSibling);
>
> ...
>
> });
>
>
> -- brion
>
>
> On Sat, May 20, 2017 at 1:25 AM, Brion Vibber <[email protected]>
> wrote:
>
> > There's also these, which run immediately if the conditions match:
> >
> > /** * Source codes pages direction and and pre white-space  */if ([2, 4,
> 8].indexOf(mw.config.get('wgNamespaceNumber')) !== -1) {
> >       if (/\.(js|css|py)$/.test(mw.config.get('wgPageName'))) {
> >               mw.util.addCSS('.diff-addedline, .diff-deletedline,
> .diff-context { direction: ltr; } ' +
> >                       '#wpTextbox1 { direction: ltr; }');
> >       }}
> > // Newbies are misusing wikilove instead using talk pages add new
> section// hiding WikiLove from not autoconfirmed users or without more than
> 100 editsif ($.inArray('autoconfirmed', mw.config.get('wgUserGroups')) ===
> -1 || mw.config.get('wgUserEditCount') < 100) {
> >       mw.util.addCSS('#ca-wikilove { display: none; }');}
> >
> >
> > There may be more in other code.
> >
> > -- brion
> >
> >
> > On Sat, May 20, 2017 at 1:23 AM, Brion Vibber <[email protected]>
> > wrote:
> >
> >> Does it happen only on the main page perhaps? The MediaWiki:Common.js
> >> <https://fa.wikipedia.org/wiki/MediaWiki:Common.js> on fa.wikipedia
> >> contains this reference to mw.util that is wrapped in an on-dom-ready
> >> instead of a module load wrapper:
> >>
> >> /** Main Page layout fixes 
> >> *********************************************************
> * *  Description: Adds an additional link to the complete list of languages
> available. *  Maintainers: [[User:AzaToth]], [[User:R. Koot]], [[User:Alex
> Smotrov]] */if (['صفحهٔ_اصلی', 
> 'بحث:صفحه_اصلی'].indexOf(mw.config.get('wgPageName'))
> !== -1) {
> >>   $(function () {
> >>     mw.util.addPortletLink('p-lang', '//meta.wikimedia.org/wiki/
> List_of_Wikipedias/fa', 'فهرست کامل', 'interwiki-completelist', 'فهرست
> کامل');
> >>   });}
> >>
> >>
> >> -- brion
> >>
> >>
> >>
> >> On Fri, May 19, 2017 at 7:34 PM, Huji Lee <[email protected]> wrote:
> >>
> >>> Okay let me clarify: mw.util *is listed* as a dependency. Otherwise
> >>> refreshing the page wouldn't fix it.
> >>>
> >>> On Fri, May 19, 2017 at 11:38 AM, Amir Ladsgroup <[email protected]>
> >>> wrote:
> >>>
> >>> > It's already announced that this won't be loaded by default anymore.
> >>> You
> >>> > need to add it as a dependency.
> >>> >
> >>> > Best
> >>> >
> >>> > On Fri, May 19, 2017, 5:54 PM Huji Lee <[email protected]> wrote:
> >>> >
> >>> > > Hi
> >>> > >
> >>> > > This is an issue I am experiencing on Persian Wikipedia (FAWP) for
> >>> the
> >>> > last
> >>> > > couple of weeks. I have replicated it in different machines, and
> >>> after
> >>> > > clearing the cache (or using incognito). I have replicated it in
> >>> Firefox
> >>> > > and in Chrome.
> >>> > >
> >>> > > When you open a page, some times certain widgets (e.g. Twinkle) or
> >>> > > user-specific JS scripts don't load. Refreshing the page will fix
> it
> >>> 99%
> >>> > of
> >>> > > the time (that 1% requires refreshing 2 or 3 times).
> >>> > >
> >>> > > Looking at the console shows an error that indicates "mw.util" is
> not
> >>> > > defined. See the error message in Firefox[1] and Chrome[2] But
> >>> because
> >>> > none
> >>> > > of the scripts have changed recently, to me it means somehow that
> >>> mw.util
> >>> > > is not loaded *some of the time*.
> >>> > >
> >>> > > The problem manifests itself mostly when you open a tab in the
> >>> background
> >>> > > (i.e. you middle-click a link), and especially when I open several
> >>> tabs
> >>> > in
> >>> > > the background.
> >>> > >
> >>> > > If I turn ResourceLoader off, the error does not occur. So I am
> >>> thinking
> >>> > it
> >>> > > has to do with RL. Any ideas on the next steps to investigate this
> >>> are
> >>> > > appreciated.
> >>> > >
> >>> > > Huji
> >>> > >
> >>> > > [1] https://commons.wikimedia.org/wiki/File:Firefox-mw.util-erro
> >>> r.png
> >>> > > [2] https://commons.wikimedia.org/wiki/File:Chrome-mw.util-
> error.png
> >>> > > _______________________________________________
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> >>> > >
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> >>
> >>
> >
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