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Dir : ~/var/www/invoice/node_modules/mem/

Edit File: index.js

'use strict';
const mimicFn = require('mimic-fn');
const isPromise = require('p-is-promise');
const mapAgeCleaner = require('map-age-cleaner');

const cacheStore = new WeakMap();

const defaultCacheKey = (...arguments_) => {
	if (arguments_.length === 0) {
		return '__defaultKey';
	}

if (arguments_.length === 1) {
		const [firstArgument] = arguments_;
		if (
			firstArgument === null ||
			firstArgument === undefined ||
			(typeof firstArgument !== 'function' && typeof firstArgument !== 'object')
		) {
			return firstArgument;
		}
	}

return JSON.stringify(arguments_);
};

const mem = (fn, options) => {
	options = Object.assign({
		cacheKey: defaultCacheKey,
		cache: new Map(),
		cachePromiseRejection: false
	}, options);

if (typeof options.maxAge === 'number') {
		mapAgeCleaner(options.cache);
	}

const {cache} = options;
	options.maxAge = options.maxAge || 0;

const setData = (key, data) => {
		cache.set(key, {
			data,
			maxAge: Date.now() + options.maxAge
		});
	};

const memoized = function (...arguments_) {
		const key = options.cacheKey(...arguments_);

if (cache.has(key)) {
			return cache.get(key).data;
		}

const cacheItem = fn.call(this, ...arguments_);

setData(key, cacheItem);

if (isPromise(cacheItem) && options.cachePromiseRejection === false) {
			// Remove rejected promises from cache unless `cachePromiseRejection` is set to `true`
			cacheItem.catch(() => cache.delete(key));
		}

return cacheItem;
	};

try {
		// The below call will throw in some host environments
		// See https://github.com/sindresorhus/mimic-fn/issues/10
		mimicFn(memoized, fn);
	} catch (_) {}

cacheStore.set(memoized, options.cache);

return memoized;
};

module.exports = mem;
// TODO: Remove this for the next major release
module.exports.default = mem;

module.exports.clear = fn => {
	const cache = cacheStore.get(fn);

if (cache && typeof cache.clear === 'function') {
		cache.clear();
	}
};