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0}),t.type){case de.BOOT:return Oe(e,{page:t.page});case de.PAGEVIEW_LOGGED:return Oe(e,{pageview:void 0});case de.PREVIEW_SEEN:return Oe(e,{pageview:{page_title:t.title,page_id:t.pageId,page_namespace:t.namespace}});default:return e}},preview:function(e,t){switch(void 0===e&&(e={enabled:{},activeLink:void 0,previewType:void 0,measures:void 0,activeToken:"",shouldShow:!1,isUserDwelling:!1,wasClicked:!1}),t.type){case de.BOOT:return Oe(e,{enabled:t.initiallyEnabled});case de.SETTINGS_CHANGE:return Oe(e,{enabled:t.newValue});case de.LINK_DWELL:return t.el!==e.activeLink?Oe(e,{activeLink:t.el,previewType:t.previewType,measures:t.measures,activeToken:t.token,shouldShow:!1,isUserDwelling:!0,promise:t.promise}):Oe(e,{isUserDwelling:!0});case de.FETCH_ABORTED:case de.ABANDON_END:return t.token!==e.activeToken||e.isUserDwelling?e:Oe(e,{activeLink:void 0,previewType:void 0,activeToken:void 0,measures:void 0,fetchResponse:void 0,shouldShow:!1});case de.PREVIEW_DWELL:return 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