feat: drop node4 support

.eslintrc

@@ -1,3 +1,3 @@
 {
-  "extends": "groupon/node4"
+  "extends": "groupon/node6"
 }

.travis.yml

@@ -1,13 +1,13 @@
 language: node_js
 node_js:
-  - 4.6.1
-  - 6.11.5
-  - 8.9.0
+  - v6.14.3
+  - v8.11.3
+  - v10.5.0
 deploy:
   - provider: script
     script: ./node_modules/.bin/nlm release
     skip_cleanup: true
     'on':
       branch: master
-      node: 8.9.0
+      node: 10.5.0
 services: memcached

lib/backend.js

@@ -32,7 +32,7 @@
 
 'use strict';
 
-const typeMap = Object.create(null);
+const typeMap = new Map();
 
 function isBackend(object) {
   return typeof object.get === 'function' && typeof object.set === 'function';
@@ -46,15 +46,15 @@ exports.create = function create(options) {
   }
 
   const type = options.type || 'noop';
-  const BackendClass = typeMap[type];
+  const BackendClass = typeMap.get(type);
   if (!BackendClass) {
     throw new Error(`${type} is not a supported cache backend type`);
   }
   return new BackendClass(options);
 };
 
 function addType(type, BackendClass) {
-  typeMap[type] = BackendClass;
+  typeMap.set(type, BackendClass);
   return BackendClass;
 }
 exports.addType = addType;

lib/backends/memcached.js

@@ -33,9 +33,10 @@
 'use strict';
 
 const promisify = require('bluebird').promisify;
-const _ = require('lodash');
 const Memcached = require('memcached');
 
+const noop = () => undefined;
+
 function createClient(options) {
   if (options.client) {
     return options.client;
@@ -63,11 +64,12 @@ MemcachedBackend.prototype.get = function get(key) {
 };
 
 MemcachedBackend.prototype.set = function set(key, value, options) {
-  return this._clientSet(key, value, options.expire).then(_.constant(value));
+  const constant = () => value;
+  return this._clientSet(key, value, options.expire).then(constant);
 };
 
 MemcachedBackend.prototype.unset = function unset(key) {
-  return this._clientDel(key).then(_.noop);
+  return this._clientDel(key).then(noop);
 };
 
 MemcachedBackend.prototype.end = function end() {

lib/backends/memory.js

@@ -38,29 +38,29 @@ const util = require('../util');
 
 /* Stores everything just in memory */
 function MemoryBackend() {
-  this.cache = Object.create(null);
+  this.cache = new Map();
   this.type = 'memory';
 }
 module.exports = MemoryBackend;
 
 MemoryBackend.prototype.get = function get(key) {
-  let wrappedValue = this.cache[key] || null;
+  let wrappedValue = this.cache.get(key) || null;
   if (util.isExpired(wrappedValue && wrappedValue.e)) {
     wrappedValue = null;
-    delete this.cache[key];
+    this.cache.delete(key);
   }
   return Bluebird.resolve(wrappedValue ? wrappedValue.d : null);
 };
 
 MemoryBackend.prototype.set = function set(key, value, options) {
-  this.cache[key] = {
+  this.cache.set(key, {
     d: value,
     e: util.expiresAt(options.expire),
-  };
+  });
   return Bluebird.resolve(value);
 };
 
 MemoryBackend.prototype.unset = function unset(key) {
-  delete this.cache[key];
+  this.cache.delete(key);
   return Bluebird.resolve();
 };

lib/cache.js

@@ -34,8 +34,6 @@
 
 'use strict';
 
-const _ = require('lodash');
-
 const Backend = require('./backend');
 const getOrElse = require('./get-or-else');
 const util = require('./util');
@@ -81,7 +79,7 @@ Cache.prototype.end = function end() {
 };
 
 Cache.prototype.prepareOptions = function prepareOptions(options) {
-  return _.extend({}, this.defaults, options);
+  return Object.assign({}, this.defaults, options);
 };
 
 Cache.prototype._set = function _set(key, val, options) {
@@ -119,6 +117,7 @@ Cache.prototype._applyTimeout = function _applyTimeout(value) {
 Cache.prototype._getWrapped = function _getWrapped(key) {
   return this._applyTimeout(this.backend.get(key));
 };
+
 // For backwards compatibility, eventually we should deprecate this.
 // It *should* be a private API.
 Cache.prototype.getWrapped = Cache.prototype._getWrapped;

lib/cached.js

@@ -33,33 +33,36 @@
 'use strict';
 
 const Bluebird = require('bluebird');
-const _ = require('lodash');
 const util = require('util');
 
 const Cache = require('./cache');
 
-let namedCaches = Object.create(null);
+const namedCaches = new Map();
 
-const getName = util.deprecate(function getName(name) {
-  return name || 'default';
-}, 'Unnamed caches and caches with non-string names are deprecated.');
+const getName = util.deprecate(
+  name => name || 'default',
+  'Unnamed caches and caches with non-string names are deprecated.'
+);
 
 function cached(name, options) {
   if (typeof name !== 'string') {
     name = getName(name);
   }
 
-  if (!(name in namedCaches)) {
-    namedCaches[name] = cached.createCache(
-      _.extend(
-        {
-          name: name,
-        },
-        options || {}
+  if (!namedCaches.has(name)) {
+    namedCaches.set(
+      name,
+      cached.createCache(
+        Object.assign(
+          {
+            name: name,
+          },
+          options || {}
+        )
       )
     );
   }
-  return namedCaches[name];
+  return namedCaches.get(name);
 }
 module.exports = cached;
 
@@ -68,17 +71,17 @@ cached.createCache = function createCache(options) {
 };
 
 cached.dropNamedCaches = function dropNamedCaches() {
-  namedCaches = Object.create(null);
+  namedCaches.clear();
   return cached;
 };
 
 cached.dropNamedCache = function dropNamedCache(name) {
-  delete namedCaches[name];
+  namedCaches.delete(name);
   return cached;
 };
 
 cached.knownCaches = function knownCaches() {
-  return Object.keys(namedCaches);
+  return [...namedCaches.keys()];
 };
 
 cached.deferred = function deferred(fn) {

lib/get-or-else.js

@@ -35,7 +35,6 @@
 'use strict';
 
 const Bluebird = require('bluebird');
-const _ = require('lodash');
 
 const util = require('./util');
 
@@ -77,10 +76,12 @@ function getOrElse(cache, key, val, opts) {
 
   function verifyFreshness(wrappedValue) {
     const hit = !!wrappedValue;
-    const expired = util.isExpired(wrappedValue && wrappedValue.b);
     let loadingNewValue = cache.staleOrPending[key] !== undefined;
 
-    if ((!hit || expired) && !loadingNewValue) {
+    if (
+      !loadingNewValue &&
+      (!hit || util.isExpired(wrappedValue && wrappedValue.b))
+    ) {
       cache.staleOrPending[key] = refreshValue();
       loadingNewValue = true;
     }
@@ -96,7 +97,7 @@ function getOrElse(cache, key, val, opts) {
 
   return cache
     ._getWrapped(key)
-    .catch(_.constant(null))
+    .catch(() => null)
     .then(verifyFreshness);
 }
 module.exports = getOrElse;

package.json

@@ -27,8 +27,7 @@
   },
   "dependencies": {
     "bluebird": "^3.3.3",
-    "lodash": "^4.6.1",
-    "memcached": "^2.1.0"
+    "memcached": "^2.2.2"
   },
   "devDependencies": {
     "assertive": "^2.1.0",
@@ -41,8 +40,8 @@
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-node": "^5.2.1",
     "eslint-plugin-prettier": "^2.2.0",
-    "mocha": "^3.1.2",
-    "nlm": "^3.0.0",
+    "mocha": "^5.2.0",
+    "nlm": "^3.3.1",
     "prettier": "^1.6.1"
   },
   "author": {

test/timeout.test.js

@@ -1,6 +1,6 @@
 import assert from 'assertive';
 import Bluebird from 'bluebird';
-import { identity } from 'lodash';
+const identity = val => val;
 
 import Cache from '../lib/cache';