Reduce dependencies and use more ES6ness

Author: Chris Sidebottom

index.js

@@ -1,10 +1,7 @@
-var _ = require('lodash');
-var util = require('util');
-
 module.exports = function (defaults) {
   return function cacheControl(ctx, next) {
     return next().then(function () {
-      var options = _.defaults(ctx.cacheControl || {}, defaults);
+      var options = ctx.cacheControl || defaults || {};
       var cacheControl = [];
 
       if (options.private) {
@@ -36,20 +33,20 @@ module.exports = function (defaults) {
         cacheControl.push('must-revalidate');
       } else if (!options.noCache) {
         if (options.staleIfError) {
-          cacheControl.push(util.format('stale-if-error=%d', options.staleIfError));
+          cacheControl.push(`stale-if-error=${options.staleIfError}`);
         }
 
         if (options.staleWhileRevalidate) {
-          cacheControl.push(util.format('stale-while-revalidate=%d', options.staleWhileRevalidate));
+          cacheControl.push(`stale-while-revalidate=${options.staleWhileRevalidate}`);
         }
       }
 
-      if (_.isNumber(options.maxAge)) {
-        cacheControl.push(util.format('max-age=%d', options.maxAge));
+      if (Number.isInteger(options.maxAge)) {
+        cacheControl.push(`max-age=${options.maxAge}`);
       }
 
-      if (_.isNumber(options.sMaxAge)) {
-        cacheControl.push(util.format('s-maxage=%d', options.sMaxAge));
+      if (Number.isInteger(options.sMaxAge)) {
+        cacheControl.push(`s-maxage=${options.sMaxAge}`);
       }
 
       if (cacheControl.length) {

package.json

@@ -31,6 +31,5 @@
     "supertest": "^2.0.0"
   },
   "dependencies": {
-    "lodash": "^4.12.0"
   }
 }

test/index.js

@@ -1,12 +1,12 @@
-var request = require('supertest');
-var koa = require('koa');
-var cacheControl = require('..');
-var fs = require('fs');
+const request = require('supertest');
+const koa = require('koa');
+const cacheControl = require('..');
+const fs = require('fs');
 
 describe('cacheControl()', function () {
   describe('default configuration', function () {
     it('uses defaults if nothing defined on request', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         maxAge: 4
@@ -25,7 +25,7 @@ describe('cacheControl()', function () {
 
   describe('override default configuration', function () {
     it('allows middleware to override options in incoming requests', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         maxAge: 4
@@ -46,7 +46,7 @@ describe('cacheControl()', function () {
     })
 
     it('allows middleware to override options on outgoing requests', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         maxAge: 300
@@ -73,7 +73,7 @@ describe('cacheControl()', function () {
 
   describe('public is set', function () {
     it('adds public flag to cache-control header', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         public: true
@@ -92,7 +92,7 @@ describe('cacheControl()', function () {
 
   describe('private is set', function () {
     it('adds private flag to cache-control header', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         private: true
@@ -109,7 +109,7 @@ describe('cacheControl()', function () {
     });
 
     it('discards public flag in cache-control header', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         private: true,
@@ -129,7 +129,7 @@ describe('cacheControl()', function () {
 
   describe('maxAge is set', function () {
     it('sets cache-control max-age section', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         maxAge: 4
@@ -148,7 +148,7 @@ describe('cacheControl()', function () {
 
   describe('staleIfError is set', function () {
     it('sets cache-control header with stale-if-error', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         staleIfError: 320
@@ -167,7 +167,7 @@ describe('cacheControl()', function () {
 
   describe('staleWhileRevalidate is set', function () {
     it('sets cache-control header with stale-while-revalidate', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         staleWhileRevalidate: 320
@@ -186,7 +186,7 @@ describe('cacheControl()', function () {
 
   describe('mustRevalidate is set', function () {
     it('sets cache-control header with must-revalidate', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         mustRevalidate: true
@@ -203,7 +203,7 @@ describe('cacheControl()', function () {
     });
 
     it('overthrows stale-while-revalidate and stale-if-error', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         mustRevalidate: true,
@@ -224,7 +224,7 @@ describe('cacheControl()', function () {
 
   describe('when noCache is true', function () {
     it('adds no-cache to Cache-Control header', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         noCache: true
@@ -241,7 +241,7 @@ describe('cacheControl()', function () {
     });
 
     it('sets maxAge to 0', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         noCache: true,
@@ -259,7 +259,7 @@ describe('cacheControl()', function () {
     });
 
     it('removes sMaxAge', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         noCache: true,
@@ -277,7 +277,7 @@ describe('cacheControl()', function () {
     });
 
     it('ignores stale settings', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         noCache: true,
@@ -298,7 +298,7 @@ describe('cacheControl()', function () {
 
   describe('when noStore is true', function () {
     it('sets Cache-Control no-store and no-cache', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         noStore: true
@@ -315,7 +315,7 @@ describe('cacheControl()', function () {
     });
 
     it('sets maxAge to 0', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         noStore: true,
@@ -335,7 +335,7 @@ describe('cacheControl()', function () {
 
   describe('when noTransform is set', function () {
     it('sets Cache-Control no-transform', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         noTransform: true
@@ -354,7 +354,7 @@ describe('cacheControl()', function () {
 
   describe('when proxyRevalidate', function () {
     it('sets Cache-Control proxy-revalidate', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         proxyRevalidate: true
@@ -374,7 +374,7 @@ describe('cacheControl()', function () {
 
   describe('when sMaxAge', function () {
     it('sets Cache-Control s-maxage property', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl({
         sMaxAge: 10
@@ -393,7 +393,7 @@ describe('cacheControl()', function () {
 
   describe('when no cache properties set', function () {
     it('does not set a cache-control header', function (done) {
-      var app = new koa();
+      const app = new koa();
 
       app.use(cacheControl());