https://www.jump-aroundpartyrentals.com/__core__/preact/custom/index.js

1import { useState, useEffect } from 'preact/hooks';
2
3export function useAsync(fn, deps=[], defaultValue=null) {
4    const [state, setState] = useState({
5        value: defaultValue,
6        loading: true,
7        error: null
8    });
9    useEffect(() => {
10        (async () => {
11            try {
12                const value = await fn();
13                setState({value, loading: false, error: null});
14            } catch (error) {
15                setState({value: null, loading: false, error});
16            }
17        })();
18    }, [fn.toString(), ...deps]);
19
20    return [state.value, state.loading, state.error];
21}
22
23export function useEventCount(evname) {
24    const [numUpdates, setNumUpdates] = useState(0);
25    useEffect(() => {
26        function updater() {
27            setNumUpdates(prev => prev + 1);
28        }
29        window.addEventListener(evname, updater);
30        return () => {
31            window.removeEventListener(evname, updater);
32        };
33    }, [evname]);
34
35    return [numUpdates];
36}