replace jest with ava

node_modules/mem/index.js

@@ -0,0 +1,64 @@
+'use strict';
+const mimicFn = require('mimic-fn');
+const mapAgeCleaner = require('map-age-cleaner');
+
+const cacheStore = new WeakMap();
+
+const mem = (fn, options = {}) => {
+	// Automatically use WeakMap unless the user provided their own cache
+	const weakCache = options.cache || new WeakMap();
+	const {
+		cacheKey = ([firstArgument]) => firstArgument,
+		cache = new Map(),
+		maxAge
+	} = options;
+
+	if (typeof maxAge === 'number') {
+		mapAgeCleaner(cache);
+	}
+
+	const memoized = function (...arguments_) {
+		const key = cacheKey(arguments_);
+
+		// Prefer WeakMap if the key allows it
+		const bestCache = key && (typeof key === 'object' || typeof key === 'function') ?
+			weakCache :
+			cache;
+
+		if (bestCache.has(key)) {
+			return bestCache.get(key).data;
+		}
+
+		const cacheItem = fn.apply(this, arguments_);
+
+		bestCache.set(key, {
+			data: cacheItem,
+			maxAge: maxAge ? Date.now() + maxAge : Infinity
+		});
+
+		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, cache);
+
+	return memoized;
+};
+
+module.exports = mem;
+
+module.exports.clear = fn => {
+	if (!cacheStore.has(fn)) {
+		throw new Error('Can\'t clear a function that was not memoized!');
+	}
+
+	const cache = cacheStore.get(fn);
+	if (typeof cache.clear === 'function') {
+		cache.clear();
+	}
+};