themes.js
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themes.js
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	// @flow

	import { Platform } from 'react-native';

	export type GlobalTheme = 'light' \| 'dark';
	export type GlobalThemePreference = GlobalTheme \| 'system';

	export type GlobalThemeInfo = {
	+activeTheme: ?GlobalTheme,
	+systemTheme: ?GlobalTheme,
	+preference: GlobalThemePreference,
	};

	export const osCanTheme: boolean =
	(Platform.OS === 'ios' && parseInt(Platform.Version, 10) >= 13) \|\|
	(Platform.OS === 'android' && Platform.Version >= 29);

	export const defaultGlobalThemeInfo = {
	// revert to `activeTheme: osCanTheme ? null : 'light'` to re-enable theming
	activeTheme: 'dark',
	systemTheme: null,
	// revert to `preference: osCanTheme ? 'system' : 'light'`
	// to re-enable theming
	preference: 'dark',
	};