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feat(waku/router): prefetch on view (<Link />) #672

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merged 4 commits into from
Apr 26, 2024
Merged

feat(waku/router): prefetch on view (<Link />) #672

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5f81389
docs: update example (yarn pnp)
bysxx Apr 25, 2024
b606461
Merge branch 'dai-shi:main' into main
bysxx Apr 26, 2024
eec012c
feat: update prefetch on view
bysxx Apr 26, 2024
5b309f9
fix: apply pr's review
bysxx Apr 26, 2024
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30 changes: 29 additions & 1 deletion packages/waku/src/router/client.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,7 @@ export type LinkProps = {
notPending?: ReactNode;
children: ReactNode;
unstable_prefetchOnEnter?: boolean;
unstable_prefetchOnView?: boolean;
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} & Omit<AnchorHTMLAttributes<HTMLAnchorElement>, 'href'>;

export function Link({
Expand All @@ -152,6 +153,7 @@ export function Link({
pending,
notPending,
unstable_prefetchOnEnter,
unstable_prefetchOnView,
...props
}: LinkProps): ReactElement {
const router = useContext(RouterContext);
Expand All @@ -166,6 +168,32 @@ export function Link({
throw new Error('Missing Router');
};
const [isPending, startTransition] = useTransition();
const ref = useRef<HTMLAnchorElement>();

useEffect(() => {
if (unstable_prefetchOnView && ref.current) {
const observer = new IntersectionObserver(
(entries) => {
entries.forEach((entry) => {
if (entry.isIntersecting) {
const url = new URL(to, window.location.href);
if (router && url.href !== window.location.href) {
const route = parseRoute(url);
router.prefetchRoute(route);
}
}
});
},
{ threshold: 0.1 },
);

observer.observe(ref.current);

return () => {
observer.disconnect();
};
}
}, [unstable_prefetchOnView, router, to]);
const onClick = (event: MouseEvent<HTMLAnchorElement>) => {
event.preventDefault();
const url = new URL(to, window.location.href);
Expand Down Expand Up @@ -198,7 +226,7 @@ export function Link({
: props.onMouseEnter;
const ele = createElement(
'a',
{ ...props, href: to, onClick, onMouseEnter },
{ ...props, href: to, onClick, onMouseEnter, ref },
children,
);
if (isPending && pending !== undefined) {
Expand Down
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