denchiklut

type Emit<T> = (value: T) => void;
type Subscribe<T> = (emit: Emit<T>) => void | (() => void);

export async function* toAsyncIterator<T>(subscribe: Subscribe<T>): AsyncGenerator<T> {
    const queue = new AsyncQueue<T>();
    const cleanup = subscribe(v => queue.push(v));

    try {
        while (true) {
            yield queue.next();

denchiklut

import { useEffect } from 'react'
import { unstable_useBlocker as useBlocker } from 'react-router-dom'

export function usePrompt(message: string, when = true) {
    const blocker = useBlocker(when)

    useEffect(() => {
        if (when) window.onbeforeunload = () => message

        return () => {