And hooks…

import { createContext, ReactNode, useContext, useEffect, useMemo, useState } from ‘react’;

type Theme = ‘legacy’ | ‘osmo’;

export type ThemeContext = { theme: Theme; };

export const ThemeContext = createContext<ThemeContext>(null as unknown as ThemeContext);

export function ThemeProvider({ theme, children, isInterEnabled, }: { theme: Theme; children: ReactNode; isInterEnabled: boolean; }) {

useEffect(() => { document.documentElement.setAttribute(‘data-theme’, theme); }, [theme]);

useEffect(() => { if (isInterEnabled) { document.documentElement.setAttribute(‘data-inter’, ‘true’); } else { document.documentElement.removeAttribute(‘data-inter’); } }, [isInterEnabled]);

const contextValue = useMemo( () => ({ theme, }), [theme], );

return <ThemeContext.Provider value={contextValue}>{children}</ThemeContext.Provider>; }

export function useTheme() { return useContext(ThemeContext); }

To theme and streamline our CSS.

Even better, we could use this data attribute to wrap blocks of CSS code, and when it’s time to remove legacy styles, we can quickly remove blocks of code later on.

:root[data-theme=’osmo’] { —Button-color-background-primary: var(—primary-color); —Button-color-background-primary-hover: var(—color-blue-600); —Button-color-background-primary-focus: var(—color-blue-700); —Button-color-background-primary-active: var(—color-blue-700);

—Button-color-border-primary: var(—primary-color); —Button-color-border-primary-hover: var(—color-blue-600); —Button-color-border-primary-focus: var(—color-blue-700); —Button-color-border-primary-active: var(—color-blue-700); —Button-color-text-primary: var(—white); }

We could add the top nav into the rebranded UI by turning on the topbar-spike flag.

import classNames from ‘classnames’; import { useTheme } from ‘theme’; import Topbar from ‘components/Topbar/Topbar’; import ‘stylesheets/components/App’;

export const App = ({ className, children, isTopbarSpikeEnabled, }: AppProps) => { const classes = classNames(‘App’, className, { ‘App—with-top-bar’: isTopbarSpikeEnabled, }); const { theme } = useTheme();

return ( <div className={classes}> <SkipToContent /> {isTopbarSpikeEnabled && <Topbar />} <AppNavContainer theme={theme} isTopbarSpikeEnabled={isTopbarSpikeEnabled} /> <main className={classNames(‘App-main’, { ‘App-main-with-topbar’: isTopbarSpikeEnabled })} id=”content” > {children} </main> </div> ); };

export default App;