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authorDimitri Staessens <dimitri@ouroboros.rocks>2019-10-06 21:37:45 +0200
committerDimitri Staessens <dimitri@ouroboros.rocks>2019-10-06 21:37:45 +0200
commit3c51c3be85bb0d1bdb87ea0d6632f1c256912f27 (patch)
treec7ccc8279b12c4f7bdbbb4270d617e48f51722e4 /node_modules/mem/index.js
parent412c104bebc507bea9c94fd53b5bdc4b64cbfe31 (diff)
downloadwebsite-3c51c3be85bb0d1bdb87ea0d6632f1c256912f27.tar.gz
website-3c51c3be85bb0d1bdb87ea0d6632f1c256912f27.zip
build: Add some required modules for node
Diffstat (limited to 'node_modules/mem/index.js')
-rw-r--r--node_modules/mem/index.js55
1 files changed, 55 insertions, 0 deletions
diff --git a/node_modules/mem/index.js b/node_modules/mem/index.js
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+++ b/node_modules/mem/index.js
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+'use strict';
+const mimicFn = require('mimic-fn');
+
+const cacheStore = new WeakMap();
+
+const defaultCacheKey = function (x) {
+ if (arguments.length === 1 && (x === null || x === undefined || (typeof x !== 'function' && typeof x !== 'object'))) {
+ return x;
+ }
+
+ return JSON.stringify(arguments);
+};
+
+module.exports = (fn, opts) => {
+ opts = Object.assign({
+ cacheKey: defaultCacheKey,
+ cache: new Map()
+ }, opts);
+
+ const memoized = function () {
+ const cache = cacheStore.get(memoized);
+ const key = opts.cacheKey.apply(null, arguments);
+
+ if (cache.has(key)) {
+ const c = cache.get(key);
+
+ if (typeof opts.maxAge !== 'number' || Date.now() < c.maxAge) {
+ return c.data;
+ }
+ }
+
+ const ret = fn.apply(null, arguments);
+
+ cache.set(key, {
+ data: ret,
+ maxAge: Date.now() + (opts.maxAge || 0)
+ });
+
+ return ret;
+ };
+
+ mimicFn(memoized, fn);
+
+ cacheStore.set(memoized, opts.cache);
+
+ return memoized;
+};
+
+module.exports.clear = fn => {
+ const cache = cacheStore.get(fn);
+
+ if (cache && typeof cache.clear === 'function') {
+ cache.clear();
+ }
+};