swarpc/dist/polyfills.js

Full type-safe RPC library for service worker -- move things off of the UI thread with ease!

Map.groupBy ??= function groupBy(iterable, callbackfn) {
    const map = new Map();
    let i = 0;
    for (const value of iterable) {
        const key = callbackfn(value, i++), list = map.get(key);
        list ? list.push(value) : map.set(key, [value]);
    }
    return map;
};
export {};