@qiniu/miku-delivery-mp-ks/dist/utils/async.js

Kuaishou Mini Program SDK for Miku Delivery

/**
 * @file Asynchronous Task related helpers
 */
/** 对于异步行为，将同时发生的多次调用进行合并 */
export function collapseCalls(
/** 异步行为实现逻辑 */
fn, 
/** 基于异步行为的调用参数计算标识（标识相同的调用才会被合并） */
getKey) {
    const results = new Map();
    return function fnWithCallsCollapsed(...args) {
        const key = getKey(...args);
        const fromCache = results.get(key);
        if (fromCache != null)
            return fromCache;
        const ret = fn(...args);
        results.set(key, ret);
        const onSettled = () => results.delete(key);
        ret.then(onSettled, onSettled);
        return ret;
    };
}