ts-prime/dist/es/cache.js

A utility library for JavaScript and Typescript.

import { hash } from './hash';
export function cache(fn, options) {
    var defaultCache = function () {
        var cache = {};
        return {
            get: function (key) {
                return cache[key];
            },
            set: function (key, data) {
                cache[key] = data;
            },
        };
    };
    var defaultCacheFn = function () {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        return hash(JSON.stringify(args));
    };
    var cacheFnF = (options === null || options === void 0 ? void 0 : options.cacheKeyFn) || defaultCacheFn;
    var cacheMechanism = (options === null || options === void 0 ? void 0 : options.cacheMechanism) || defaultCache();
    return function () {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        var cacheId = cacheFnF.apply(void 0, args);
        var cached = cacheMechanism.get(cacheId);
        if (cached == null) {
            var result = fn.apply(void 0, args);
            if (result instanceof Promise) {
                return result.then(function (r) {
                    cacheMechanism.set(cacheId, r);
                    return r;
                });
            }
            cacheMechanism.set(cacheId, result);
            return result;
        }
        return cached;
    };
}