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[iso] Add async onBeforeRoute() prop hook #885

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[iso] Add async onBeforeRoute() prop hook #885

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fcc01c9
[iso] Add async onBeforeRoute() prop hook
developit Oct 14, 2021
bdc1216
lint fixes
developit Oct 14, 2021
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19 changes: 17 additions & 2 deletions packages/preact-iso/router.js
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Original file line number Diff line number Diff line change
Expand Up @@ -108,6 +108,8 @@ export function Router(props) {
// was the most recent render successful (did not suspend):
const didSuspend = useRef();
didSuspend.current = false;
// current return value of onBeforeRoute() prop
const onBeforeRoute = useRef();

cur.current = useMemo(() => {
// This hack prevents Preact from diffing when we swap `cur` to `prev`:
Expand All @@ -117,6 +119,16 @@ export function Router(props) {

prev.current = cur.current;

let obr = props.onBeforeRoute && props.onBeforeRoute(url);
if (obr && obr.then) {
obr = obr.then(() => {
if (onBeforeRoute.current === obr) {
onBeforeRoute.current = null;
}
});
}
onBeforeRoute.current = obr;

let p, d, m;
toChildArray(props.children).some(vnode => {
const matches = exec(rest, vnode.props.path, (m = { path: rest, query, params, rest: '' }));
Expand Down Expand Up @@ -188,11 +200,14 @@ export function Router(props) {
}, [path, wasPush, c]);

// Note: curChildren MUST render first in order to set didSuspend & prev.
return [h(RenderRef, { r: cur }), h(RenderRef, { r: prev })];
return [h(RenderRef, { p: onBeforeRoute.current, r: cur }), h(RenderRef, { r: prev })];
}

// Lazily render a ref's current value:
const RenderRef = ({ r }) => r.current;
const RenderRef = ({ p, r }) => {
if (p && p.then) throw p;
return r.current;
};

Router.Provider = LocationProvider;

Expand Down