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(In reply to comment #0)
> We want to do some simple checks and redirect users in some cases

Could you elaborate on that?

(In reply to comment #1)
> (In reply to comment #0)
> > We want to do some simple checks and redirect users in some cases
> 
> Could you elaborate on that?

From [[zh:MediaWiki:Common.js]]:

mw.loader.using(['mediawiki.Uri'], function() {
    /* Search Engine variant hack */
    var ref, loc;
    try {
        ref = new mw.Uri( document.referrer );
        loc = new mw.Uri( location.href );
    } catch ( e ) {
        return;
    }
    if (/\.google\./.test(ref.host) && /\/zh(-[^/]+)?\//.test(loc.path)) {
        loc.path = loc.path.replace(/\/zh(-[^/]+)?\//, "/wiki/");
        location = loc.toString();
    }
} );

You can do this with a gadget now using the 'top' option, see e.g. on [[pl:MediaWiki:Gadgets-definition]]; see bug 27488. (Also, I think this is a dupe of that bug.)

Not sure if we really want this in core.

(Relevant line is "
main-page [ResourceLoader | top | default] | main-page.js | main-page.css".)

Shouldn't we just fix the search behavior with variants rather than using site JS here anyway?

Common.js is feature-locked as far as I'm concerned. It loads at the bottom and in the global scope. For anything else, use Gadgets.

You can create a gadget with position=top.