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

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

import resolveOnce from 'resolve-once-cb';
export default function resolveOnceMap(fn) {
    const resolvers = {};
    return (key, callback)=>{
        if (typeof callback !== 'function') throw new Error('resolve-once-map-cb missing callback');
        if (!resolvers[key]) {
            resolvers[key] = resolveOnce((cb)=>{
                try {
                    return fn(key, cb);
                } catch (err) {
                    return cb(err);
                }
            });
        }
        return resolvers[key](callback);
    };
}