live re-theme for auto - #2530
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chaitanyapotti
approved these changes
Jul 22, 2026
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Jira Link
Description
When
uiConfig.modeis set to"auto", the Web3Auth modal now follows live OS color-scheme changes. Previously the theme was resolved once from theisDarkprop, so switching the OS between light and dark mid-session left the open modal on the stale theme. The modal now re-themes instantly without needing to be closed and reopened.Changes
WidgetContext(packages/modal/src/ui/context/WidgetContext.tsx)isDarkprop toisDarkPropand derive the effectiveisDarkfrom local state, seeded fromprefers-color-schemewhenmode === "auto"(falling back to the prop otherwise).matchMedia("(prefers-color-scheme: dark)")listener (active only in"auto"mode) that updates the React context value on OS theme changes.w3a--darkvariant on#w3a-parent-containerin sync with the context value so component styling and context state stay aligned.window/matchMediaaccess for SSR safety and cleaned up the listener on unmount / mode change.How has this been tested?
Screenshots (if appropriate)
Screen.Recording.2026-07-21.at.11.26.18.PM.mov
Types of changes
Checklist
Note
Low Risk
Scoped UI/theming in WidgetContext with SSR guards; no auth, data, or API changes.
Overview
When
uiConfig.modeis"auto", the modal no longer sticks to the theme resolved once from the parentisDarkprop.WidgetProvidernow keepsisDarkin React state (initialized fromprefers-color-schemewhen possible) and subscribes tomatchMedia("(prefers-color-scheme: dark)")so an open modal updates light/dark as the OS scheme changes.On each scheme change it also toggles
w3a--darkon#w3a-parent-container, aligning Tailwind’s dark variant with context (e.g.appLogo).window/matchMediausage is guarded for SSR, and the listener is removed when mode is not auto or on unmount.Reviewed by Cursor Bugbot for commit e66ad1d. Bugbot is set up for automated code reviews on this repo. Configure here.