refactor start

home/ags/node_modules/eslint-plugin-n/lib/util/cache.js

@@ -1,58 +0,0 @@
-/**
- * @author Toru Nagashima
- * See LICENSE file in root directory for full license.
- */
-"use strict"
-
-const SKIP_TIME = 5000
-
-/**
- * The class of cache.
- * The cache will dispose of each value if the value has not been accessed
- * during 5 seconds.
- */
-module.exports = class Cache {
-    /**
-     * Initialize this cache instance.
-     */
-    constructor() {
-        this.map = new Map()
-    }
-
-    /**
-     * Get the cached value of the given key.
-     * @param {any} key The key to get.
-     * @returns {any} The cached value or null.
-     */
-    get(key) {
-        const entry = this.map.get(key)
-        const now = Date.now()
-
-        if (entry) {
-            if (entry.expire > now) {
-                entry.expire = now + SKIP_TIME
-                return entry.value
-            }
-            this.map.delete(key)
-        }
-        return null
-    }
-
-    /**
-     * Set the value of the given key.
-     * @param {any} key The key to set.
-     * @param {any} value The value to set.
-     * @returns {void}
-     */
-    set(key, value) {
-        const entry = this.map.get(key)
-        const expire = Date.now() + SKIP_TIME
-
-        if (entry) {
-            entry.value = value
-            entry.expire = expire
-        } else {
-            this.map.set(key, { value, expire })
-        }
-    }
-}