Created
February 10, 2020 12:31
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usePreloadRoute to preload code or data based on events
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import { useCallback } from 'react'; | |
import { matchRoutes, MatchedRoute, RouteConfig } from 'react-router-config'; | |
const prepareMatches = <Params extends { [K in keyof Params]?: string }>(matches: Array<MatchedRoute<Params>>) => { | |
return matches.map(match => { | |
const { route, match: matchData } = match; | |
const prepared = route.prepare ? route.prepare(matchData.params) : {}; | |
const Component = route.component.get(); | |
if (Component == null) { | |
route.component.load(); // eagerly load | |
} | |
return { component: route.component, prepared, routeData: matchData }; | |
}); | |
}; | |
const preloadCode = (pathname: string) => { | |
// preload just the code for a route, without storing the result | |
const matches = matchRoutes(routes, pathname); | |
matches.forEach(({ route }) => route.component.load()); | |
}; | |
const preload = (pathname: string) => { | |
// preload the code and data for a route, without storing the result | |
const matches = matchRoutes(routes, pathname); | |
prepareMatches(matches); | |
}; | |
export const usePreloadRoute = (to: string) => { | |
const router = useRoutingContext(); | |
// Callback to preload just the code for the route: | |
// we pass this to onMouseEnter, which is a weaker signal | |
// that the user *may* navigate to the route. | |
const preloadRouteCode = useCallback(() => { | |
router.preloadCode(to); | |
}, [to, router]); | |
// Callback to preload the code and data for the route: | |
// we pass this to onMouseDown, since this is a stronger | |
// signal that the user will likely complete the navigation | |
const preloadRoute = useCallback(() => { | |
router.preload(to); | |
}, [to, router]); | |
return [preloadRouteCode, preloadRoute]; | |
}; |
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