@benev/slate/x/tools/debounce/debounce.js

frontend web stuff

export function debounce(delay, action) {
    let latestArgs;
    let timeout;
    let waitingQueue = [];
    function reset() {
        latestArgs = [];
        if (timeout)
            clearTimeout(timeout);
        timeout = undefined;
        waitingQueue = [];
    }
    reset();
    return ((...args) => {
        latestArgs = args;
        if (timeout)
            clearTimeout(timeout);
        const promise = new Promise((resolve, reject) => {
            waitingQueue.push({ resolve, reject });
        });
        timeout = setTimeout(() => {
            Promise.resolve()
                .then(() => action(...latestArgs))
                .then(r => {
                for (const { resolve } of waitingQueue)
                    resolve(r);
                reset();
            })
                .catch(err => {
                for (const { reject } of waitingQueue)
                    reject(err);
                reset();
            });
        }, delay);
        return promise;
    });
}
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