Splitting this task off of T52040#557239, we currently output the following directly into the HTML page source of MediaWiki's action=view for non-logged in users on en.wikipedia.org (with light pretty-printing):
<script>(window.RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgCanonicalNamespace":"",
"wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"Main_Page",
"wgTitle":"Main Page",
"wgCurRevisionId":696846920,"wgRevisionId":696846920,"wgArticleId":15580374,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view",
"wgUserName":null,"wgUserGroups":["*"],"wgCategories":[],"wgBreakFrames":false,"wgPageContentLanguage":"en",
"wgPageContentModel":"wikitext",
"wgSeparatorTransformTable":["",
""],"wgDigitTransformTable":["",
""],"wgDefaultDateFormat":"dmy",
"wgMonthNames":["",
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December"],"wgMonthNamesShort":["",
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec"],"wgRelevantPageName":"Main_Page",
"wgRelevantArticleId":15580374,"wgRequestId":"V48CpApAIDYAADlksn8AAABB",
"wgIsProbablyEditable":false,"wgRestrictionEdit":["sysop"],"wgRestrictionMove":["sysop"],"wgIsMainPage":true,"wgWikiEditorEnabledModules":{"toolbar":true,"dialogs":true,"preview":false,"publish":false},"wgBetaFeaturesFeatures":[],"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgVisualEditor":{"pageLanguageCode":"en",
"pageLanguageDir":"ltr",
"usePageImages":true,"usePageDescriptions":true},"wgPreferredVariant":"en",
"wgRelatedArticles":null,"wgRelatedArticlesUseCirrusSearch":true,"wgRelatedArticlesOnlyUseCirrusSearch":false,"wgULSCurrentAutonym":"English",
"wgFlaggedRevsParams":{"tags":{"status":{"levels":1,"quality":2,"pristine":3}}},"wgStableRevisionId":null,"wgCategoryTreePageCategoryOptions":"{\"mode\":0,\"hideprefix\":20,\"showcount\":true,\"namespaces\":false}",
"wgNoticeProject":"wikipedia",
"wgCentralNoticeCookiesToDelete":[],"wgCentralNoticeCategoriesUsingLegacy":["Fundraising",
"fundraising"],"wgWikibaseItemId":"Q5296",
"wgCentralAuthMobileDomain":false,"wgVisualEditorToolbarScrollOffset":0});mw.loader.implement("user.options",function($,jQuery,require,module){mw.user.options.set({"variant":"en"});});mw.loader.implement("user.tokens",function ( $, jQuery, require, module ) {
mw.user.tokens.set({"editToken":"+\\",
"patrolToken":"+\\",
"watchToken":"+\\",
"csrfToken":"+\\"});/*@nomin*/;
});mw.loader.load(["mediawiki.page.startup",
"mediawiki.legacy.wikibits",
"ext.centralauth.centralautologin",
"mmv.head",
"ext.visualEditor.desktopArticleTarget.init",
"ext.uls.init",
"ext.uls.interface",
"ext.quicksurveys.init",
"mw.MediaWikiPlayer.loader",
"mw.PopUpMediaTransform",
"skins.vector.js"]);});</script>For logged-in users, it's this (with light pretty-printing and redaction of the tokens):
<script>(window.RLQ=window.RLQ||[]).push(function(){mw.config.set({"wgCanonicalNamespace":"",
"wgCanonicalSpecialPageName":false,"wgNamespaceNumber":0,"wgPageName":"Main_Page",
"wgTitle":"Main Page",
"wgCurRevisionId":696846920,"wgRevisionId":696846920,"wgArticleId":15580374,"wgIsArticle":true,"wgIsRedirect":false,"wgAction":"view",
"wgUserName":"MZMcBride",
"wgUserGroups":["extendedconfirmed",
"*",
"user",
"autoconfirmed"],"wgCategories":[],"wgBreakFrames":false,"wgPageContentLanguage":"en",
"wgPageContentModel":"wikitext",
"wgSeparatorTransformTable":["",
""],"wgDigitTransformTable":["",
""],"wgDefaultDateFormat":"dmy",
"wgMonthNames":["",
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December"],"wgMonthNamesShort":["",
"Jan",
"Feb",
"Mar",
"Apr",
"May",
"Jun",
"Jul",
"Aug",
"Sep",
"Oct",
"Nov",
"Dec"],"wgRelevantPageName":"Main_Page",
"wgRelevantArticleId":15580374,"wgRequestId":"V48HKgpAAEUAAOoC60oAAAAA",
"wgUserId":212624,"wgUserEditCount":179895,"wgUserRegistration":1117578315000,"wgUserNewMsgRevisionId":729425882,"wgIsProbablyEditable":false,"wgRestrictionEdit":["sysop"],"wgRestrictionMove":["sysop"],"wgIsMainPage":true,"wgEchoConfig":{"version":"1.11",
"eventlogging":{"Echo":{"enabled":false,"revision":7731316,"client":false},"EchoMail":{"enabled":true,"revision":5467650,"client":false},"EchoInteraction":{"enabled":true,"revision":15180901,"client":true}}},"wgGlobalGroups":["global-ipblock-exempt"],"wgWikiEditorEnabledModules":{"toolbar":true,"dialogs":true,"preview":false,"publish":false},"wgBetaFeaturesFeatures":[],"wgMediaViewerOnClick":true,"wgMediaViewerEnabledByDefault":true,"wgVisualEditor":{"pageLanguageCode":"en",
"pageLanguageDir":"ltr",
"usePageImages":true,"usePageDescriptions":true},"wgPreferredVariant":"en",
"wgRelatedArticles":null,"wgRelatedArticlesUseCirrusSearch":true,"wgRelatedArticlesOnlyUseCirrusSearch":false,"wgULSAcceptLanguageList":["en-us",
"en"],"wgULSCurrentAutonym":"English",
"wgFlaggedRevsParams":{"tags":{"status":{"levels":1,"quality":2,"pristine":3}}},"wgStableRevisionId":null,"wgCategoryTreePageCategoryOptions":"{\"mode\":0,\"hideprefix\":20,\"showcount\":true,\"namespaces\":false}",
"wgNoticeProject":"wikipedia",
"wgCentralNoticeCookiesToDelete":[],"wgCentralNoticeCategoriesUsingLegacy":["Fundraising",
"fundraising"],"wgNoticeUserData":{"registration":"20050531222515"},"wgWikibaseItemId":"Q5296",
"wgVisualEditorToolbarScrollOffset":0,"wgEchoInitialNotifCount":{"alert":21,"message":187},"wgEchoSeenTime":{"alert":"20160719205515",
"message":"20160526121023"}});mw.loader.implement("user.options",function($,jQuery,require,module){mw.user.options.set({"visualeditor-hidebetawelcome":"1",
"visualeditor-tabs":"multi-tab",
"visualeditor-hidetabdialog":"1",
"ccmeonemails":"1",
"editfont":"monospace",
"extendwatchlist":"1",
"forceeditsummary":"1",
"imagesize":"1",
"nickname":"MZMcBride",
"rclimit":"100",
"rows":"17",
"showhiddencats":"1",
"skin":"monobook",
"underline":"0",
"usenewrc":"1",
"watchlistdays":"30",
"wllimit":"1000",
"echo-subscriptions-email-edit-user-talk":1,"echo-subscriptions-web-article-linked":"1",
"searchNs0":"",
"gadget-ReferenceTooltips":"",
"gadget-DRN-wizard":"",
"gadget-charinsert":"",
"cx":"0",
"gadget-addsection-plus":"1",
"gadget-edittop":"1",
"mfWatchlistFilter":"all",
"mfWatchlistView":"a-z",
"pagetriage-lastuse":"20130709122306",
"popups":"0",
"timecorrection":"ZoneInfo|-300|America/New_York",
"uls-compact-links":"0",
"usecodeeditor":"0",
"userjs-NewPagesFeedFilterOptions":
"{ \"namespace\":\"0\", \"showunreviewed\":\"1\", \"limit\":20, \"dir\":\"newestfirst\" }",
"userjs-curationtoolbar":"maximized",
"userjs-gettingstarted-showtour":"0",
"visualeditor-hideusered":"1",
"watchlisttoken":"[...]",
"wikibase-otherprojects":"0"});});mw.loader.implement("user.tokens",function ( $, jQuery, require, module ) {
mw.user.tokens.set({"editToken":"[...]",
"patrolToken":"[...]",
"watchToken":"[...]",
"csrfToken":"[...]"});/*@nomin*/;
});mw.loader.load(["mediawiki.page.startup",
"mediawiki.legacy.wikibits",
"ext.gadget.WatchlistBase",
"ext.gadget.WatchlistGreenIndicatorsMono",
"ext.centralauth.centralautologin.clearcookie",
"mmv.head",
"ext.visualEditor.desktopArticleTarget.init",
"ext.uls.init",
"ext.uls.interface",
"ext.quicksurveys.init",
"mw.MediaWikiPlayer.loader",
"mw.PopUpMediaTransform"]);});</script>We should reconsider whether outputting all of these user options and other site data directly into the HTML page source is the best approach.