resolve-once-map/dist/esm/index.js

Resolves a promise only once and memoizes the result in a map

import resolveOnce from 'resolve-once';
export default function resolveOnceMap(fn) {
    const resolvers = {};
    return (key)=>{
        if (!resolvers[key]) {
            resolvers[key] = resolveOnce(()=>{
                try {
                    return fn(key);
                } catch (err) {
                    return Promise.reject(err);
                }
            });
        }
        return resolvers[key]();
    };
}