@naturalcycles/js-lib/dist/decorators/memoFn.js

Standard library for universal (browser + Node.js) javascript

import { jsonMemoSerializer, MapMemoCache } from './memo.util.js';
/**
 * Only supports Sync functions.
 * To support Async functions - use _memoFnAsync.
 * Technically, you can use it with Async functions, but it'll return the Promise without awaiting it.
 *
 * @experimental
 */
export function _memoFn(fn, opt = {}) {
    const { logger = console, cacheFactory = () => new MapMemoCache(), cacheKeyFn = jsonMemoSerializer, } = opt;
    const cache = cacheFactory();
    const memoizedFn = function (...args) {
        const ctx = this;
        const cacheKey = cacheKeyFn(args);
        if (cache.has(cacheKey)) {
            return cache.get(cacheKey);
        }
        const value = fn.apply(ctx, args);
        try {
            cache.set(cacheKey, value);
        }
        catch (err) {
            logger.error(err);
        }
        return value;
    };
    Object.assign(memoizedFn, { cache });
    return memoizedFn;
}