root-context.js
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root-context.js
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	// @flow

	import type { GenericNavigationAction } from '@react-navigation/native';

	import * as React from 'react';
	import hoistNonReactStatics from 'hoist-non-react-statics';
	import PropTypes from 'prop-types';

	export type RootContextType = {\|
	detectUnsupervisedBackground?: ?(alreadyClosed: boolean) => boolean,
	setNavStateInitialized: () => void,
	onNavAction: (action: GenericNavigationAction \| string) => void,
	\|};

	const RootContext = React.createContext<?RootContextType>(null);

	function withRootContext<
	AllProps: {},
	ComponentType: React.ComponentType<AllProps>,
	>(
	Component: ComponentType,
	): React.ComponentType<
	$Diff<React.ElementConfig<ComponentType>, { rootContext: ?RootContextType }>,
	> &
	ComponentType {
	function RootContextHOC(
	props: $Diff<
	React.ElementConfig<ComponentType>,
	{ rootContext: ?RootContextType },
	>,
	) {
	return (
	<RootContext.Consumer>
	{value => <Component {...props} rootContext={value} />}
	</RootContext.Consumer>
	);
	}
	const MemoizedRootContextHOC = React.memo(RootContextHOC);
	hoistNonReactStatics(MemoizedRootContextHOC, Component);
	// $FlowFixMe React.memo typing fixed in later version of Flow
	return MemoizedRootContextHOC;
	}

	const rootContextPropType = PropTypes.shape({
	detectUnsupervisedBackground: PropTypes.func,
	setNavStateInitialized: PropTypes.func.isRequired,
	onNavAction: PropTypes.func.isRequired,
	});

	export { RootContext, withRootContext, rootContextPropType };