@nestjs/passport/dist/utils/memoize.util.js

Nest - modern, fast, powerful node.js web framework (@passport)

const defaultKey = 'default';
export function memoize(fn) {
    const cache = {};
    return (...args) => {
        const n = args[0] || defaultKey;
        if (n in cache) {
            return cache[n];
        }
        else {
            const result = fn(n === defaultKey ? undefined : n);
            cache[n] = result;
            return result;
        }
    };
}