fix: don't use reserved keywords

closes #834

Author: fent

.eslintrc.json

@@ -1,7 +1,10 @@
 {
   "extends": "eslint:recommended",
   "parserOptions": {
-    "ecmaVersion": 2017
+    "ecmaVersion": 2017,
+    "ecmaFeatures": {
+      "impliedStrict": true
+    }
   },
   "env": {
     "es6": true,

lib/utils.js

@@ -140,16 +140,16 @@ exports.deprecate = (obj, prop, value, oldPath, newPath) => {
 
 
 // Check for updates.
-const package = require('../package.json');
+const pkg = require('../package.json');
 exports.lastUpdateCheck = 0;
 exports.checkForUpdates = () => {
-  if (!process.env.YTDL_NO_UPDATE && !package.version.startsWith('0.0.0-') &&
+  if (!process.env.YTDL_NO_UPDATE && !pkg.version.startsWith('0.0.0-') &&
     Date.now() - exports.lastUpdateCheck >= 1000 * 60 * 60 * 12) {
     exports.lastUpdateCheck = Date.now();
     return miniget('https://api.github.com/repos/fent/node-ytdl-core/releases/latest', {
       headers: { 'User-Agent': 'ytdl-core' },
     }).text().then(response => {
-      if (JSON.parse(response).tag_name !== `v${package.version}`) {
+      if (JSON.parse(response).tag_name !== `v${pkg.version}`) {
         console.warn('\x1b[33mWARNING:\x1B[0m ytdl-core is out of date! Update with "npm install ytdl-core@latest".');
       }
     });

test/utils-test.js

@@ -106,11 +106,11 @@ describe('utils.checkForUpdates', () => {
 
   describe('Already on latest', () => {
     it('Does not warn the console', async() => {
-      const package = require('../package.json');
-      sinon.replace(package, 'version', 'v1.0.0');
+      const pkg = require('../package.json');
+      sinon.replace(pkg, 'version', 'v1.0.0');
       const scope = nock('https://api.github.com')
         .get('/repos/fent/node-ytdl-core/releases/latest')
-        .reply(200, { tag_name: `v${package.version}` });
+        .reply(200, { tag_name: `v${pkg.version}` });
       const warnSpy = sinon.spy();
       sinon.replace(console, 'warn', warnSpy);
       sinon.replace(Date, 'now', sinon.stub().returns(Infinity));
@@ -122,8 +122,8 @@ describe('utils.checkForUpdates', () => {
 
   describe('When there is a new update', () => {
     it('Warns the console about the update', async() => {
-      const package = require('../package.json');
-      sinon.replace(package, 'version', 'v1.0.0');
+      const pkg = require('../package.json');
+      sinon.replace(pkg, 'version', 'v1.0.0');
       const scope = nock('https://api.github.com')
         .get('/repos/fent/node-ytdl-core/releases/latest')
         .reply(200, { tag_name: 'vInfinity.0.0' });