List of steps to reproduce (step by step, including full links if applicable):
What happens?:
Both wvui and wvui-search modules are loaded at the same time
What should have happened instead?:
Only wvui should be loaded, or wvui-search should be a subset of wvui aided by code splitting
Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc:
@Jdlrobson by default Special:GlobalWatchlist shouldn't be loading WVUI (or Vue), thats only if $wgGlobalWatchlistUseVue is true, which isn't done anywhere, or if $wgGlobalWatchlistDevMode is true (currently only on the beta cluster) *and* you specify a displayversion=vue parameter in the URL. So, if this is occurring in production (or locally without those overrides) then there is a separate issue that the vue code is being loaded when it shouldn't. Is this double loading specific to Special:GlobalWatchlist? Or does it happen elsewhere too?
It can also happen in production if a QuickSurvey is enabled.
It's going to become more of a problem as more things adopt Vue.js using components outside the wvui-search bundle.
Per T310243: Deprecate WVUI in favor of Codex and with TypeaheadSearch now being Codex based. For similar issue around Codex see above mentioned T310553.