hfs/src/expiringCache.js

HTTP File Server

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.expiringCache = expiringCache;
function expiringCache(ttl) {
    const o = new Map();
    return Object.assign(o, {
        try(k, creator) {
            let ret = o.get(k);
            if (ret === undefined) {
                ret = creator();
                o.set(k, ret);
                Promise.resolve(ret).then(() => // in case of async, wait for it to be done before starting the timer
                 setTimeout(() => o.delete(k), ttl));
            }
            return ret;
        },
    });
}