diff --git a/.eslintrc.js b/.eslintrc.js
index 7223f8117ea1..04b0f3ed1a58 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -12,39 +12,30 @@ module.exports = {
   parser: 'babel-eslint',
   extends: ['airbnb', 'prettier'],
   rules: {
-    // allow console
-    'no-console': OFF,
-    // require radix argument in parseInt
+    'no-console': OFF, // We have console.error, console.warn, etc.
     radix: ERROR,
     'class-methods-use-this': OFF,
-    'react/no-multi-comp': OFF,
-    'import/no-extraneous-dependencies': OFF,
-    'react/no-danger': OFF,
     'no-empty': [ERROR, {allowEmptyCatch: true}],
+    'no-param-reassign': OFF,
+    'no-plusplus': OFF,
+    'import/no-extraneous-dependencies': OFF,
+    'react/jsx-closing-bracket-location': OFF, // Formatting is left to Prettier.
+    'react/jsx-filename-extension': OFF, // Enable in future when migrating.
+    'react/no-danger': OFF, // Need this to inject scripts.
+    'react/no-multi-comp': OFF, // One component per file creates too many files.
+    'react/no-unescaped-entities': [ERROR, {forbid: ['>', '}']}],
 
     // Existing ESLint errors sorted by frequency, silencing first.
     'react/button-has-type': OFF, // 1
     'react/forbid-prop-types': OFF, // 1
     'react/require-default-props': OFF, // 1
     'jsx-a11y/anchor-is-valid': OFF, // 9
-    'arrow-body-style': OFF, // 10
-    'react/jsx-curly-brace-presence': OFF, // 11
-    'react/no-unescaped-entities': OFF, // 12
-    'no-param-reassign': OFF, // 12
-    'spaced-comment': OFF, // 14
     'import/no-unresolved': OFF, // 15
-    'object-shorthand': OFF, // 16
-    'dot-notation': OFF, // 19
     'react/prefer-stateless-function': OFF, // 22
-    'no-plusplus': OFF, // 23
     'prefer-arrow-callback': OFF, // 30
-    'react/jsx-filename-extension': OFF, // 31
-    'import/newline-after-import': OFF, // 31
-    'react/jsx-closing-bracket-location': OFF, // 36
     'func-names': OFF, // 37
     'import/no-dynamic-require': OFF, // 46
     'prefer-destructuring': OFF, // 69
-    'prefer-const': OFF, // 71
     'global-require': OFF, // 85
     'react/jsx-one-expression-per-line': OFF, // 129
     'react/prop-types': OFF, // 197
diff --git a/examples/basics/pages/en/help.js b/examples/basics/pages/en/help.js
index 6434d7793716..ed5db281e1ce 100755
--- a/examples/basics/pages/en/help.js
+++ b/examples/basics/pages/en/help.js
@@ -8,6 +8,7 @@
 const React = require('react');
 
 const CompLibrary = require('../../core/CompLibrary.js');
+
 const Container = CompLibrary.Container;
 const GridBlock = CompLibrary.GridBlock;
 
@@ -19,7 +20,7 @@ function docUrl(doc, language) {
 
 class Help extends React.Component {
   render() {
-    let language = this.props.language || '';
+    const language = this.props.language || '';
     const supportLinks = [
       {
         content: `Learn more using the [documentation on this site.](${docUrl(
diff --git a/examples/basics/pages/en/index.js b/examples/basics/pages/en/index.js
index 0afae4234ebe..9bdd2743b31c 100755
--- a/examples/basics/pages/en/index.js
+++ b/examples/basics/pages/en/index.js
@@ -8,6 +8,7 @@
 const React = require('react');
 
 const CompLibrary = require('../../core/CompLibrary.js');
+
 const MarkdownBlock = CompLibrary.MarkdownBlock; /* Used to read markdown */
 const Container = CompLibrary.Container;
 const GridBlock = CompLibrary.GridBlock;
@@ -73,7 +74,7 @@ const PromoSection = props => (
 
 class HomeSplash extends React.Component {
   render() {
-    let language = this.props.language || '';
+    const language = this.props.language || '';
     return (
       <SplashContainer>
         <Logo img_src={imgUrl('docusaurus.svg')} />
@@ -179,7 +180,7 @@ const Showcase = props => {
 
   return (
     <div className="productShowcaseSection paddingBottom">
-      <h2>Who's Using This?</h2>
+      <h2>Who is Using This?</h2>
       <p>This project is used by all these people</p>
       <div className="logos">{showcase}</div>
       <div className="more-users">
@@ -193,7 +194,7 @@ const Showcase = props => {
 
 class Index extends React.Component {
   render() {
-    let language = this.props.language || '';
+    const language = this.props.language || '';
 
     return (
       <div>
diff --git a/examples/basics/pages/en/users.js b/examples/basics/pages/en/users.js
index 458eb9757094..d741e3298101 100644
--- a/examples/basics/pages/en/users.js
+++ b/examples/basics/pages/en/users.js
@@ -8,6 +8,7 @@
 const React = require('react');
 
 const CompLibrary = require('../../core/CompLibrary.js');
+
 const Container = CompLibrary.Container;
 
 const siteConfig = require(process.cwd() + '/siteConfig.js');
@@ -30,7 +31,7 @@ class Users extends React.Component {
         <Container padding={['bottom', 'top']}>
           <div className="showcaseSection">
             <div className="prose">
-              <h1>Who's Using This?</h1>
+              <h1>Who is Using This?</h1>
               <p>This project is used by many folks</p>
             </div>
             <div className="logos">{showcase}</div>
diff --git a/examples/basics/siteConfig.js b/examples/basics/siteConfig.js
index b73026bd0027..cbd6d7cbd911 100644
--- a/examples/basics/siteConfig.js
+++ b/examples/basics/siteConfig.js
@@ -5,10 +5,10 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-// See https://docusaurus.io/docs/site-config.html for all the possible
+// See https://docusaurus.io/docs/site-config for all the possible
 // site configuration options.
 
-/* List of projects/orgs using your project for the users page */
+// List of projects/orgs using your project for the users page.
 const users = [
   {
     caption: 'User1',
@@ -21,10 +21,10 @@ const users = [
 ];
 
 const siteConfig = {
-  title: 'Test Site' /* title for your website */,
+  title: 'Test Site', // Title for your website.
   tagline: 'A website for testing',
-  url: 'https://your-docusaurus-test-site.com' /* your website url */,
-  baseUrl: '/' /* base url for your project */,
+  url: 'https://your-docusaurus-test-site.com', // Your website URL
+  baseUrl: '/', // Base URL for your project */
   // For github.io type URLs, you would set the url and baseUrl like:
   //   url: 'https://facebook.github.io',
   //   baseUrl: '/test-site/',
@@ -52,14 +52,15 @@ const siteConfig = {
   footerIcon: 'img/docusaurus.svg',
   favicon: 'img/favicon.png',
 
-  /* colors for website */
+  /* Colors for website */
   colors: {
     primaryColor: '#2E8555',
     secondaryColor: '#205C3B',
   },
 
-  /* custom fonts for website */
-  /*fonts: {
+  /* Custom fonts for website */
+  /*
+  fonts: {
     myFont: [
       "Times New Roman",
       "Serif"
@@ -68,26 +69,29 @@ const siteConfig = {
       "-apple-system",
       "system-ui"
     ]
-  },*/
+  },
+  */
 
-  // This copyright info is used in /core/Footer.js and blog rss/atom feeds.
+  // This copyright info is used in /core/Footer.js and blog RSS/Atom feeds.
   copyright:
     'Copyright © ' +
     new Date().getFullYear() +
     ' Your Name or Your Company Name',
 
   highlight: {
-    // Highlight.js theme to use for syntax highlighting in code blocks
+    // Highlight.js theme to use for syntax highlighting in code blocks.
     theme: 'default',
   },
 
-  // Add custom scripts here that would be placed in <script> tags
+  // Add custom scripts here that would be placed in <script> tags.
   scripts: ['https://buttons.github.io/buttons.js'],
 
-  /* On page navigation for the current documentation page */
+  // On page navigation for the current documentation page.
   onPageNav: 'separate',
+  // No .html extensions for paths.
+  cleanUrl: true,
 
-  /* Open Graph and Twitter card images */
+  // Open Graph and Twitter card images.
   ogImage: 'img/docusaurus.png',
   twitterImage: 'img/docusaurus.png',
 
diff --git a/examples/translations/pages/en/help-with-translations.js b/examples/translations/pages/en/help-with-translations.js
index ce60bb3f1a37..19dbc9cc00cd 100644
--- a/examples/translations/pages/en/help-with-translations.js
+++ b/examples/translations/pages/en/help-with-translations.js
@@ -8,6 +8,7 @@
 const React = require('react');
 
 const CompLibrary = require('../../core/CompLibrary.js');
+
 const Container = CompLibrary.Container;
 const GridBlock = CompLibrary.GridBlock;
 
diff --git a/examples/versions/pages/en/versions.js b/examples/versions/pages/en/versions.js
index 92bfc688dc9a..6eacf2c53c06 100644
--- a/examples/versions/pages/en/versions.js
+++ b/examples/versions/pages/en/versions.js
@@ -8,6 +8,7 @@
 const React = require('react');
 
 const CompLibrary = require('../../core/CompLibrary');
+
 const Container = CompLibrary.Container;
 
 const CWD = process.cwd();
@@ -34,10 +35,10 @@ function Versions() {
               <tr>
                 <th>{latestVersion}</th>
                 <td>
-                  <a href={''}>Documentation</a>
+                  <a href="">Documentation</a>
                 </td>
                 <td>
-                  <a href={''}>Release Notes</a>
+                  <a href="">Release Notes</a>
                 </td>
               </tr>
             </tbody>
@@ -52,10 +53,10 @@ function Versions() {
               <tr>
                 <th>master</th>
                 <td>
-                  <a href={''}>Documentation</a>
+                  <a href="">Documentation</a>
                 </td>
                 <td>
-                  <a href={''}>Release Notes</a>
+                  <a href="">Release Notes</a>
                 </td>
               </tr>
             </tbody>
@@ -70,10 +71,10 @@ function Versions() {
                     <tr>
                       <th>{version}</th>
                       <td>
-                        <a href={''}>Documentation</a>
+                        <a href="">Documentation</a>
                       </td>
                       <td>
-                        <a href={''}>Release Notes</a>
+                        <a href="">Release Notes</a>
                       </td>
                     </tr>
                   )
diff --git a/lib/__tests__/build-files.test.js b/lib/__tests__/build-files.test.js
index 91f6067c42dd..afd1fc7d55ab 100644
--- a/lib/__tests__/build-files.test.js
+++ b/lib/__tests__/build-files.test.js
@@ -15,6 +15,7 @@ const shell = require('shelljs');
 const CWD = process.cwd();
 
 const utils = require('../server/utils');
+
 const siteConfig = require(CWD + '/website/siteConfig.js');
 const buildDir = CWD + '/website/build';
 const docsDir = CWD + '/docs';
@@ -67,11 +68,9 @@ describe('Build files', () => {
   });
 
   test('Generated HTML for each Markdown resource', function() {
-    let metadata = [];
-    outputHTMLFiles.forEach(function(file) {
-      const path = filepath.create(file);
-      metadata.push(path.basename());
-    });
+    const metadata = outputHTMLFiles.map(file =>
+      filepath.create(file).basename()
+    );
     inputMarkdownFiles.forEach(function(file) {
       const data = fs.readFileSync(file, 'utf8');
       const frontmatter = fm(data);
@@ -105,11 +104,9 @@ describe('Build files', () => {
   });
 
   test('Copied assets from /docs/assets', function() {
-    let metadata = [];
-    outputAssetsFiles.forEach(function(file) {
-      const path = filepath.create(file);
-      metadata.push(path.basename());
-    });
+    const metadata = outputAssetsFiles.map(file =>
+      filepath.create(file).basename()
+    );
     inputAssetsFiles.forEach(function(file) {
       const path = filepath.create(file);
       expect(metadata).toContain(path.basename());
diff --git a/lib/build-files.js b/lib/build-files.js
index 46b22639fbf3..940669c4ce04 100755
--- a/lib/build-files.js
+++ b/lib/build-files.js
@@ -22,6 +22,7 @@ require('babel-register')({
 // initial check that required files are present
 const chalk = require('chalk');
 const fs = require('fs');
+
 const CWD = process.cwd();
 
 if (!fs.existsSync(CWD + '/siteConfig.js')) {
@@ -33,6 +34,7 @@ if (!fs.existsSync(CWD + '/siteConfig.js')) {
 
 // generate all static html files
 const generate = require('./server/generate.js');
+
 generate()
   .then(() => {
     console.log("Site built successfully. Generated files in 'build' folder.");
diff --git a/lib/copy-examples.js b/lib/copy-examples.js
index 639a0b0da32e..72b6c2209dba 100755
--- a/lib/copy-examples.js
+++ b/lib/copy-examples.js
@@ -32,13 +32,13 @@ if (fs.existsSync(CWD + '/package.json')) {
   if (!packageContent.scripts) {
     packageContent.scripts = {};
   }
-  packageContent.scripts['start'] = 'docusaurus-start';
-  packageContent.scripts['build'] = 'docusaurus-build';
+  packageContent.scripts.start = 'docusaurus-start';
+  packageContent.scripts.build = 'docusaurus-build';
   packageContent.scripts['publish-gh-pages'] = 'docusaurus-publish';
-  packageContent.scripts['examples'] = 'docusaurus-examples';
+  packageContent.scripts.examples = 'docusaurus-examples';
   packageContent.scripts['write-translations'] =
     'docusaurus-write-translations';
-  packageContent.scripts['version'] = 'docusaurus-version';
+  packageContent.scripts.version = 'docusaurus-version';
   packageContent.scripts['rename-version'] = 'docusaurus-rename-version';
   fs.writeFileSync(
     CWD + '/package.json',
@@ -69,7 +69,7 @@ if (feature === 'translations') {
     fs.copySync(folder + '/crowdin.yaml', CWD + '/../crowdin.yaml');
     exampleSiteCreated = true;
   }
-  let files = glob.sync(folder + '/**/*');
+  const files = glob.sync(folder + '/**/*');
   files.forEach(file => {
     if (fs.lstatSync(file).isDirectory()) {
       return;
@@ -97,7 +97,7 @@ if (feature === 'translations') {
 } else if (feature === 'versions') {
   // copy files for versions
   const folder = path.join(__dirname, '..', 'examples', 'versions');
-  let files = glob.sync(folder + '/**/*');
+  const files = glob.sync(folder + '/**/*');
   files.forEach(file => {
     if (fs.lstatSync(file).isDirectory()) {
       return;
@@ -171,7 +171,7 @@ if (feature === 'translations') {
   );
 
   // copy other files
-  let files = glob.sync(folder + '/**/*');
+  const files = glob.sync(folder + '/**/*');
   files.forEach(file => {
     if (fs.lstatSync(file).isDirectory()) {
       return;
diff --git a/lib/core/BlogPageLayout.js b/lib/core/BlogPageLayout.js
index 6c1d07d179b7..2ac9248b05d0 100644
--- a/lib/core/BlogPageLayout.js
+++ b/lib/core/BlogPageLayout.js
@@ -41,20 +41,18 @@ class BlogPageLayout extends React.Component {
           <Container className="mainContainer postContainer blogContainer">
             <div className="posts">
               {MetadataBlog.slice(page * perPage, (page + 1) * perPage).map(
-                post => {
-                  return (
-                    <BlogPost
-                      post={post}
-                      content={post.content}
-                      truncate
-                      key={
-                        utils.getPath(post.path, this.props.config.cleanUrl) +
-                        post.title
-                      }
-                      config={this.props.config}
-                    />
-                  );
-                }
+                post => (
+                  <BlogPost
+                    post={post}
+                    content={post.content}
+                    truncate
+                    key={
+                      utils.getPath(post.path, this.props.config.cleanUrl) +
+                      post.title
+                    }
+                    config={this.props.config}
+                  />
+                )
               )}
               <div className="docs-prevnext">
                 {page > 0 && (
diff --git a/lib/core/BlogPostLayout.js b/lib/core/BlogPostLayout.js
index aa58b55b9a58..d39325aceb7e 100644
--- a/lib/core/BlogPostLayout.js
+++ b/lib/core/BlogPostLayout.js
@@ -103,7 +103,7 @@ class BlogPostLayout extends React.Component {
     const hasOnPageNav = this.props.config.onPageNav === 'separate';
     const post = this.props.metadata;
     post.path = utils.getPath(post.path, this.props.config.cleanUrl);
-    let blogSidebarTitleConfig = this.props.config.blogSidebarTitle || {};
+    const blogSidebarTitleConfig = this.props.config.blogSidebarTitle || {};
     return (
       <Site
         className={classNames('sideNavVisible', {
@@ -111,13 +111,13 @@ class BlogPostLayout extends React.Component {
         })}
         url={'blog/' + post.path}
         title={this.props.metadata.title}
-        language={'en'}
+        language="en"
         description={this.getDescription()}
         config={this.props.config}
         metadata={{blog: true}}>
         <div className="docMainWrapper wrapper">
           <BlogSidebar
-            language={'en'}
+            language="en"
             current={post}
             config={this.props.config}
           />
@@ -126,7 +126,7 @@ class BlogPostLayout extends React.Component {
               <BlogPost
                 post={post}
                 content={this.props.children}
-                language={'en'}
+                language="en"
                 config={this.props.config}
               />
               {this.renderSocialButtons()}
diff --git a/lib/core/BlogSidebar.js b/lib/core/BlogSidebar.js
index c730b14128ce..80b52116ac81 100644
--- a/lib/core/BlogSidebar.js
+++ b/lib/core/BlogSidebar.js
@@ -14,7 +14,7 @@ const MetadataBlog = require('./MetadataBlog.js');
 class BlogSidebar extends React.Component {
   render() {
     let blogSidebarCount = 5;
-    let blogSidebarTitleConfig = this.props.config.blogSidebarTitle || {};
+    const blogSidebarTitleConfig = this.props.config.blogSidebarTitle || {};
     let blogSidebarTitle = blogSidebarTitleConfig.default || 'Recent Posts';
     if (this.props.config.blogSidebarCount) {
       if (this.props.config.blogSidebarCount === 'ALL') {
diff --git a/lib/core/CompLibrary.js b/lib/core/CompLibrary.js
index 55ca1232feef..6dee1337255e 100644
--- a/lib/core/CompLibrary.js
+++ b/lib/core/CompLibrary.js
@@ -11,7 +11,7 @@ const GridBlock = require('./GridBlock.js');
 
 // A collection of components to provide to users
 module.exports = {
-  MarkdownBlock: MarkdownBlock,
-  Container: Container,
-  GridBlock: GridBlock,
+  MarkdownBlock,
+  Container,
+  GridBlock,
 };
diff --git a/lib/core/DocsLayout.js b/lib/core/DocsLayout.js
index 89b47198c04c..decf445e4b84 100644
--- a/lib/core/DocsLayout.js
+++ b/lib/core/DocsLayout.js
@@ -85,7 +85,7 @@ class DocsLayout extends React.Component {
                       ][metadata.previous_id] ||
                       translation[this.props.metadata.language][
                         'localized-strings'
-                      ]['previous'] ||
+                      ].previous ||
                       'Previous'
                     : metadata.previous_title || 'Previous'}
                 </a>
@@ -103,7 +103,7 @@ class DocsLayout extends React.Component {
                       ][metadata.next_id] ||
                       translation[this.props.metadata.language][
                         'localized-strings'
-                      ]['next'] ||
+                      ].next ||
                       'Next'
                     : metadata.next_title || 'Next'}{' '}
                   →
diff --git a/lib/core/DocsSidebar.js b/lib/core/DocsSidebar.js
index 6cbdbbf6128c..87f1ce13ecd7 100644
--- a/lib/core/DocsSidebar.js
+++ b/lib/core/DocsSidebar.js
@@ -12,8 +12,8 @@ const readCategories = require('../server/readCategories.js');
 
 class DocsSidebar extends React.Component {
   render() {
-    let sidebar = this.props.metadata.sidebar;
-    let docsCategories = readCategories(sidebar);
+    const sidebar = this.props.metadata.sidebar;
+    const docsCategories = readCategories(sidebar);
     const categoryName = docsCategories[this.props.metadata.language][0].name;
     if (!categoryName) {
       return null;
diff --git a/lib/core/Head.js b/lib/core/Head.js
index e8bfaad84225..b939c3dc9250 100644
--- a/lib/core/Head.js
+++ b/lib/core/Head.js
@@ -13,14 +13,14 @@ class Head extends React.Component {
     const links = this.props.config.headerLinks;
     const hasBlog = links.some(link => link.blog);
 
-    let highlight = {
+    const highlight = {
       version: '9.12.0',
       theme: 'default',
       ...this.props.config.highlight,
     };
 
     // Use user-provided themeUrl if it exists, else construct one from version and theme.
-    let highlightThemeURL = highlight.themeUrl
+    const highlightThemeURL = highlight.themeUrl
       ? highlight.themeUrl
       : `//cdnjs.cloudflare.com/ajax/libs/highlight.js/${
           highlight.version
@@ -143,17 +143,13 @@ class Head extends React.Component {
           ))}
 
         {this.props.config.scrollToTop && (
-          <script
-            src={
-              'https://unpkg.com/vanilla-back-to-top@7.1.14/dist/vanilla-back-to-top.min.js'
-            }
-          />
+          <script src="https://unpkg.com/vanilla-back-to-top@7.1.14/dist/vanilla-back-to-top.min.js" />
         )}
         {this.props.config.scrollToTop && (
           <script
             dangerouslySetInnerHTML={{
               __html: `
-        document.addEventListener("DOMContentLoaded", function(){
+        document.addEventListener('DOMContentLoaded', function() {
           addBackToTop(
             ${JSON.stringify(
               Object.assign(
diff --git a/lib/core/Site.js b/lib/core/Site.js
index 45b58aa0f14e..d6037b052200 100644
--- a/lib/core/Site.js
+++ b/lib/core/Site.js
@@ -10,6 +10,7 @@ const fs = require('fs');
 
 const HeaderNav = require('./nav/HeaderNav.js');
 const Head = require('./Head.js');
+
 const Footer = require(process.cwd() + '/core/Footer.js');
 const translation = require('../server/translation.js');
 const constants = require('./constants');
diff --git a/lib/core/nav/HeaderNav.js b/lib/core/nav/HeaderNav.js
index 78790c2c1a39..7035074d8eb8 100644
--- a/lib/core/nav/HeaderNav.js
+++ b/lib/core/nav/HeaderNav.js
@@ -10,6 +10,7 @@ const CWD = process.cwd();
 const React = require('react');
 const fs = require('fs');
 const classNames = require('classnames');
+
 const siteConfig = require(CWD + '/siteConfig.js');
 const translation = require('../../server/translation.js');
 const env = require('../../server/env.js');
@@ -18,16 +19,18 @@ const translate = require('../../server/translate.js').translate;
 const setLanguage = require('../../server/translate.js').setLanguage;
 
 const readMetadata = require('../../server/readMetadata.js');
+
 readMetadata.generateMetadataDocs();
 const Metadata = require('../metadata.js');
 const utils = require('../utils.js');
+
 const extension = siteConfig.cleanUrl ? '' : '.html';
 
 // language dropdown nav item for when translations are enabled
 class LanguageDropDown extends React.Component {
   render() {
     setLanguage(this.props.language || 'en');
-    let helpTranslateString = translate(
+    const helpTranslateString = translate(
       'Help Translate|recruit community translators for your project'
     );
     // add all enabled languages to dropdown
diff --git a/lib/core/nav/SideNav.js b/lib/core/nav/SideNav.js
index fd3da91229f1..50562df0f0b3 100644
--- a/lib/core/nav/SideNav.js
+++ b/lib/core/nav/SideNav.js
@@ -15,7 +15,7 @@ const utils = require('../utils.js');
 class SideNav extends React.Component {
   // return appropriately translated category string
   getLocalizedCategoryString(category) {
-    let categoryString = translation[this.props.language]
+    const categoryString = translation[this.props.language]
       ? translation[this.props.language]['localized-strings'][category] ||
         category
       : category;
diff --git a/lib/core/renderMarkdown.js b/lib/core/renderMarkdown.js
index 2f7062d87f7a..a3e70b4ed312 100644
--- a/lib/core/renderMarkdown.js
+++ b/lib/core/renderMarkdown.js
@@ -25,7 +25,7 @@ class MarkdownRenderer {
       // Highlight.js expects hljs css classes on the code element.
       // This results in <pre><code class="hljs css languages-jsx">
       langPrefix: 'hljs css languages-',
-      highlight: function(str, lang) {
+      highlight(str, lang) {
         lang =
           lang || (siteConfig.highlight && siteConfig.highlight.defaultLang);
         if (lang) {
@@ -90,6 +90,4 @@ class MarkdownRenderer {
 
 const renderMarkdown = new MarkdownRenderer();
 
-module.exports = source => {
-  return renderMarkdown.toHtml(source);
-};
+module.exports = source => renderMarkdown.toHtml(source);
diff --git a/lib/core/toSlug.js b/lib/core/toSlug.js
index 21bf1ccb229f..2d9102a0e18c 100644
--- a/lib/core/toSlug.js
+++ b/lib/core/toSlug.js
@@ -42,9 +42,9 @@ module.exports = (string, context = {}) => {
     // Handle uppercase characters
     .toLowerCase()
     // Handle accentuated characters
-    .replace(new RegExp('[' + accents + ']', 'g'), c => {
-      return without.charAt(accents.indexOf(c));
-    })
+    .replace(new RegExp('[' + accents + ']', 'g'), c =>
+      without.charAt(accents.indexOf(c))
+    )
     // Replace `.`, `(` and `?` with blank string like Github does
     .replace(/\.|\(|\?/g, '')
     // Dash special characters
diff --git a/lib/generate-feed.js b/lib/generate-feed.js
index 59d1ddddd532..fafdebb08c6b 100755
--- a/lib/generate-feed.js
+++ b/lib/generate-feed.js
@@ -17,6 +17,7 @@ require('babel-register')({
 // initial check that required files are present
 const chalk = require('chalk');
 const fs = require('fs');
+
 const CWD = process.cwd();
 
 if (!fs.existsSync(CWD + '/siteConfig.js')) {
@@ -28,4 +29,5 @@ if (!fs.existsSync(CWD + '/siteConfig.js')) {
 
 // generate rss feed
 const feed = require('./server/feed.js');
+
 console.log(feed());
diff --git a/lib/rename-version.js b/lib/rename-version.js
index c9d0231c139b..7d41958ea52c 100755
--- a/lib/rename-version.js
+++ b/lib/rename-version.js
@@ -112,9 +112,9 @@ if (fs.existsSync(CWD + '/versioned_docs/version-' + currentVersion)) {
 
 // if sidebar file exists for this version, rename sidebar file and rewrite
 // doc ids in the file
-let currentSidebarFile =
+const currentSidebarFile =
   CWD + '/versioned_sidebars/version-' + currentVersion + '-sidebars.json';
-let newSidebarFile =
+const newSidebarFile =
   CWD + '/versioned_sidebars/version-' + newVersion + '-sidebars.json';
 if (fs.existsSync(currentSidebarFile)) {
   fs.renameSync(currentSidebarFile, newSidebarFile);
diff --git a/lib/server/env.js b/lib/server/env.js
index fa7fc1dea1c5..96f16ffa9e3a 100644
--- a/lib/server/env.js
+++ b/lib/server/env.js
@@ -9,6 +9,7 @@ const CWD = process.cwd();
 const fs = require('fs-extra');
 const path = require('path');
 const chalk = require('chalk');
+
 const siteConfig = require(CWD + '/siteConfig.js');
 
 const join = path.join;
diff --git a/lib/server/feed.js b/lib/server/feed.js
index 9d52413a8280..433dc8742974 100644
--- a/lib/server/feed.js
+++ b/lib/server/feed.js
@@ -6,9 +6,11 @@
  */
 
 const Feed = require('feed');
+
 const CWD = process.cwd();
 const siteConfig = require(CWD + '/siteConfig.js');
 const readMetadata = require('./readMetadata.js');
+
 const blogRootURL = siteConfig.url + siteConfig.baseUrl + 'blog';
 const siteImageURL =
   siteConfig.url + siteConfig.baseUrl + siteConfig.headerIcon;
diff --git a/lib/server/generate.js b/lib/server/generate.js
index 0070d545e141..c2dd40d00e40 100644
--- a/lib/server/generate.js
+++ b/lib/server/generate.js
@@ -158,7 +158,7 @@ async function execute() {
       rawContent = insertTableOfContents(rawContent);
     }
 
-    let defaultVersion = env.versioning.defaultVersion;
+    const defaultVersion = env.versioning.defaultVersion;
 
     // replace any links to markdown files to their website html links
     Object.keys(mdToHtml).forEach(key => {
@@ -250,7 +250,7 @@ async function execute() {
     .forEach(file => {
       // Why normalize? In case we are on Windows.
       // Remember the nuance of glob: https://www.npmjs.com/package/glob#windows
-      let normalizedFile = path.normalize(file);
+      const normalizedFile = path.normalize(file);
       const extension = path.extname(normalizedFile);
       if (extension !== '.md' && extension !== '.markdown') {
         return;
@@ -273,7 +273,7 @@ async function execute() {
       );
       metadata.id = metadata.title;
 
-      let language = 'en';
+      const language = 'en';
       const blogPostComp = (
         <BlogPostLayout
           metadata={metadata}
@@ -284,15 +284,15 @@ async function execute() {
       );
       const str = renderToStaticMarkupWithDoctype(blogPostComp);
 
-      let targetFile = join(buildDir, 'blog', filePath);
+      const targetFile = join(buildDir, 'blog', filePath);
       writeFileAndCreateFolder(targetFile, str);
     });
   // create html files for all blog pages (collections of article previews)
   const BlogPageLayout = require('../core/BlogPageLayout.js');
   const perPage = 10;
   for (let page = 0; page < Math.ceil(MetadataBlog.length / perPage); page++) {
-    let language = 'en';
-    const metadata = {page: page, perPage: perPage};
+    const language = 'en';
+    const metadata = {page, perPage};
     const blogPageComp = (
       <BlogPageLayout
         metadata={metadata}
@@ -302,7 +302,7 @@ async function execute() {
     );
     const str = renderToStaticMarkupWithDoctype(blogPageComp);
 
-    let targetFile = join(
+    const targetFile = join(
       buildDir,
       'blog',
       page > 0 ? 'page' + (page + 1) : '',
@@ -389,7 +389,7 @@ async function execute() {
   files.forEach(file => {
     // Why normalize? In case we are on Windows.
     // Remember the nuance of glob: https://www.npmjs.com/package/glob#windows
-    let normalizedFile = path.normalize(file);
+    const normalizedFile = path.normalize(file);
     // parse css files to replace colors and fonts according to siteConfig
     if (normalizedFile.match(/\.css$/) && !isSeparateCss(normalizedFile)) {
       const mainCss = join(buildDir, 'css', 'main.css');
@@ -453,7 +453,7 @@ async function execute() {
   files.forEach(file => {
     // Why normalize? In case we are on Windows.
     // Remember the nuance of glob: https://www.npmjs.com/package/glob#windows
-    let normalizedFile = path.normalize(file);
+    const normalizedFile = path.normalize(file);
     // render .js files to strings
     if (normalizedFile.match(/\.js$/)) {
       const pageID = path.basename(normalizedFile, '.js');
@@ -511,7 +511,7 @@ async function execute() {
         }
 
         // write to base level
-        let language = env.translation.enabled ? 'en' : '';
+        const language = env.translation.enabled ? 'en' : '';
         translate.setLanguage(language);
         const str = renderToStaticMarkupWithDoctype(
           <Site
@@ -529,7 +529,7 @@ async function execute() {
         );
       } else {
         // allow for rendering of other files not in pages/en folder
-        let language = env.translation.enabled ? 'en' : '';
+        const language = env.translation.enabled ? 'en' : '';
         translate.setLanguage(language);
         const str = renderToStaticMarkupWithDoctype(
           <Site
@@ -564,8 +564,8 @@ async function execute() {
       writeFileAndCreateFolder(targetFile, str);
     } else if (!fs.lstatSync(normalizedFile).isDirectory()) {
       // copy other non .js files
-      let parts = normalizedFile.split('pages');
-      let targetFile = join(buildDir, parts[1]);
+      const parts = normalizedFile.split('pages');
+      const targetFile = join(buildDir, parts[1]);
       mkdirp.sync(path.dirname(targetFile));
       fs.copySync(normalizedFile, targetFile);
     }
@@ -573,7 +573,7 @@ async function execute() {
 
   // Generate CNAME file if a custom domain is specified in siteConfig
   if (siteConfig.cname) {
-    let targetFile = join(buildDir, 'CNAME');
+    const targetFile = join(buildDir, 'CNAME');
     fs.writeFileSync(targetFile, siteConfig.cname);
   }
 }
diff --git a/lib/server/readMetadata.js b/lib/server/readMetadata.js
index b6570c8f6a4f..2ce18f2c9046 100644
--- a/lib/server/readMetadata.js
+++ b/lib/server/readMetadata.js
@@ -14,6 +14,7 @@ const glob = require('glob');
 const metadataUtils = require('./metadataUtils');
 
 const env = require('./env.js');
+
 const siteConfig = require(CWD + '/siteConfig.js');
 const versionFallback = require('./versionFallback.js');
 const utils = require('./utils.js');
@@ -56,7 +57,7 @@ function readSidebar() {
     const categories = allSidebars[sidebar];
 
     let ids = [];
-    let categoryOrder = [];
+    const categoryOrder = [];
     Object.keys(categories).forEach(category => {
       ids = ids.concat(categories[category]);
       for (let i = 0; i < categories[category].length; i++) {
@@ -71,9 +72,9 @@ function readSidebar() {
       if (i > 0) previous = ids[i - 1];
       if (i < ids.length - 1) next = ids[i + 1];
       order[id] = {
-        previous: previous,
-        next: next,
-        sidebar: sidebar,
+        previous,
+        next,
+        sidebar,
         category: categoryOrder[i],
       };
     }
@@ -156,7 +157,7 @@ function processMetadata(file, refDir) {
     }
   }
 
-  return {metadata, rawContent: rawContent};
+  return {metadata, rawContent};
 }
 
 // process metadata for all docs and save into core/metadata.js
@@ -188,7 +189,7 @@ function generateMetadataDocs() {
       if (!res) {
         return;
       }
-      let metadata = res.metadata;
+      const metadata = res.metadata;
       metadatas[metadata.id] = metadata;
 
       // create a default list of documents for each enabled language based on docs in English
@@ -196,24 +197,24 @@ function generateMetadataDocs() {
       enabledLanguages
         .filter(currentLanguage => currentLanguage !== 'en')
         .forEach(currentLanguage => {
-          let baseMetadata = Object.assign({}, metadata);
-          baseMetadata['id'] = baseMetadata['id']
+          const baseMetadata = Object.assign({}, metadata);
+          baseMetadata.id = baseMetadata.id
             .toString()
             .replace(/^en-/, currentLanguage + '-');
-          if (baseMetadata['permalink'])
-            baseMetadata['permalink'] = baseMetadata['permalink']
+          if (baseMetadata.permalink)
+            baseMetadata.permalink = baseMetadata.permalink
               .toString()
               .replace(/^docs\/en\//, 'docs/' + currentLanguage + '/');
-          if (baseMetadata['next'])
-            baseMetadata['next'] = baseMetadata['next']
+          if (baseMetadata.next)
+            baseMetadata.next = baseMetadata.next
               .toString()
               .replace(/^en-/, currentLanguage + '-');
-          if (baseMetadata['previous'])
-            baseMetadata['previous'] = baseMetadata['previous']
+          if (baseMetadata.previous)
+            baseMetadata.previous = baseMetadata.previous
               .toString()
               .replace(/^en-/, currentLanguage + '-');
-          baseMetadata['language'] = currentLanguage;
-          defaultMetadatas[baseMetadata['id']] = baseMetadata;
+          baseMetadata.language = currentLanguage;
+          defaultMetadatas[baseMetadata.id] = baseMetadata;
         });
       Object.assign(metadatas, defaultMetadatas);
     }
@@ -234,7 +235,7 @@ function generateMetadataDocs() {
       if (!res) {
         return;
       }
-      let metadata = res.metadata;
+      const metadata = res.metadata;
       metadatas[metadata.id] = metadata;
     }
   });
@@ -305,7 +306,7 @@ function generateMetadataDocs() {
 function generateMetadataBlog() {
   const metadatas = [];
 
-  let files = glob.sync(CWD + '/blog/**/*.*');
+  const files = glob.sync(CWD + '/blog/**/*.*');
   files
     .sort()
     .reverse()
@@ -336,7 +337,7 @@ function generateMetadataBlog() {
       metadata.id = metadata.title;
 
       // Extract, YYYY, MM, DD from the file name
-      let filePathDateArr = path
+      const filePathDateArr = path
         .basename(file)
         .toString()
         .split('-');
diff --git a/lib/server/server.js b/lib/server/server.js
index 98854aa2ebf0..57a7c1a3a774 100644
--- a/lib/server/server.js
+++ b/lib/server/server.js
@@ -71,9 +71,7 @@ function execute(port, options) {
     }
   }
 
-  /****************************************************************************/
-
-  let readMetadata = require('./readMetadata.js');
+  const readMetadata = require('./readMetadata.js');
   let Metadata;
   let MetadataBlog;
   let siteConfig;
@@ -103,8 +101,6 @@ function execute(port, options) {
     }
   }
 
-  /****************************************************************************/
-
   const TABLE_OF_CONTENTS_TOKEN = '<AUTOGENERATED_TABLE_OF_CONTENTS>';
 
   const insertTableOfContents = rawContent => {
@@ -119,8 +115,6 @@ function execute(port, options) {
     return rawContent.replace(TABLE_OF_CONTENTS_TOKEN, tableOfContents);
   };
 
-  /****************************************************************************/
-
   function isSeparateCss(file) {
     if (!siteConfig.separateCss) {
       return false;
@@ -181,8 +175,6 @@ function execute(port, options) {
     );
   }
 
-  /****************************************************************************/
-
   reloadMetadata();
   reloadMetadataBlog();
   extractTranslations();
@@ -192,10 +184,10 @@ function execute(port, options) {
 
   // handle all requests for document pages
   app.get(docsRouting(siteConfig.baseUrl), (req, res, next) => {
-    let url = req.path.toString().replace(siteConfig.baseUrl, '');
+    const url = req.path.toString().replace(siteConfig.baseUrl, '');
 
     // links is a map from a permalink to an id for each document
-    let links = {};
+    const links = {};
     Object.keys(Metadata).forEach(id => {
       const metadata = Metadata[id];
       links[metadata.permalink] = id;
@@ -254,7 +246,7 @@ function execute(port, options) {
       rawContent = insertTableOfContents(rawContent);
     }
 
-    let defaultVersion = env.versioning.defaultVersion;
+    const defaultVersion = env.versioning.defaultVersion;
 
     // replace any links to markdown files to their website html links
     Object.keys(mdToHtml).forEach(key => {
@@ -326,7 +318,7 @@ function execute(port, options) {
 
   app.get(feedRouting(siteConfig.baseUrl), (req, res, next) => {
     res.set('Content-Type', 'application/rss+xml');
-    let file = req.path
+    const file = req.path
       .toString()
       .split('blog/')[1]
       .toLowerCase();
@@ -354,8 +346,8 @@ function execute(port, options) {
       page < Math.ceil(MetadataBlog.length / perPage);
       page++
     ) {
-      let language = 'en';
-      const metadata = {page: page, perPage: perPage};
+      const language = 'en';
+      const metadata = {page, perPage};
       const blogPageComp = (
         <BlogPageLayout
           metadata={metadata}
@@ -369,7 +361,7 @@ function execute(port, options) {
       blogPages[pagePath] = str;
     }
 
-    let parts = req.path.toString().split('blog/');
+    const parts = req.path.toString().split('blog/');
     // send corresponding blog page if appropriate
     if (parts[1] === 'index.html') {
       res.send(blogPages['/index.html']);
@@ -412,7 +404,7 @@ function execute(port, options) {
       );
       metadata.id = metadata.title;
 
-      let language = 'en';
+      const language = 'en';
       removeModuleAndChildrenFromCache(join('..', 'core', 'BlogPostLayout.js'));
       const BlogPostLayout = require(join('..', 'core', 'BlogPostLayout.js'));
 
@@ -502,7 +494,7 @@ function execute(port, options) {
       fs.existsSync((userFile = englishFile))
     ) {
       // copy into docusaurus so require paths work
-      let userFileParts = userFile.split('pages' + sep);
+      const userFileParts = userFile.split('pages' + sep);
       let tempFile = join(__dirname, '..', 'pages', userFileParts[1]);
       tempFile = tempFile.replace(
         path.basename(file),
@@ -546,7 +538,7 @@ function execute(port, options) {
     );
     let cssContent = fs.readFileSync(mainCssPath, {encoding: 'utf8'});
 
-    let files = glob.sync(join(CWD, 'static', '**', '*.css'));
+    const files = glob.sync(join(CWD, 'static', '**', '*.css'));
 
     files.forEach(file => {
       if (isSeparateCss(file)) {
@@ -604,8 +596,8 @@ function execute(port, options) {
   // "redirect" requests to pages ending with "/" or no extension so that,
   // for example, request to "blog" returns "blog/index.html" or "blog.html"
   app.get(noExtRouting(), (req, res, next) => {
-    let slash = req.path.toString().endsWith('/') ? '' : '/';
-    let requestUrl = 'http://localhost:' + port + req.path;
+    const slash = req.path.toString().endsWith('/') ? '' : '/';
+    const requestUrl = 'http://localhost:' + port + req.path;
     requestFile(requestUrl + slash + 'index.html', res, () => {
       requestFile(
         slash === '/'
diff --git a/lib/server/sitemap.js b/lib/server/sitemap.js
index 9d1ce66be021..5f0440546ef2 100644
--- a/lib/server/sitemap.js
+++ b/lib/server/sitemap.js
@@ -8,6 +8,7 @@
 const fs = require('fs-extra');
 
 const glob = require('glob');
+
 const CWD = process.cwd();
 
 const sitemap = require('sitemap');
@@ -15,24 +16,18 @@ const utils = require('../core/utils');
 
 const siteConfig = require(CWD + '/siteConfig.js');
 
-/****************************************************************************/
-
-let readMetadata;
-let Metadata;
-let MetadataBlog;
+const readMetadata = require('./readMetadata.js');
 
-readMetadata = require('./readMetadata.js');
 readMetadata.generateMetadataDocs();
-Metadata = require('../core/metadata.js');
-readMetadata.generateMetadataBlog();
-MetadataBlog = require('../core/MetadataBlog.js');
+const Metadata = require('../core/metadata.js');
 
-/****************************************************************************/
+readMetadata.generateMetadataBlog();
+const MetadataBlog = require('../core/MetadataBlog.js');
 
 module.exports = function(callback) {
   console.log('sitemap.js triggered...');
 
-  let files = glob.sync(CWD + '/pages/en/**/*.js');
+  const files = glob.sync(CWD + '/pages/en/**/*.js');
 
   // English-only is the default.
   let enabledLanguages = [
@@ -45,7 +40,7 @@ module.exports = function(callback) {
 
   // If we have a languages.js file, get all the enabled languages in there
   if (fs.existsSync(CWD + '/languages.js')) {
-    let languages = require(CWD + '/languages.js');
+    const languages = require(CWD + '/languages.js');
     enabledLanguages = languages.filter(lang => lang.enabled);
   }
 
@@ -56,7 +51,7 @@ module.exports = function(callback) {
       ? url.replace(/\.js$/, '')
       : url.replace(/\.js$/, '.html');
     const links = enabledLanguages.map(lang => {
-      let langUrl = lang.tag + url;
+      const langUrl = lang.tag + url;
       return {lang: lang.tag, url: langUrl};
     });
     return {url, changefreq: 'weekly', priority: 0.5, links};
@@ -73,10 +68,10 @@ module.exports = function(callback) {
   Object.keys(Metadata)
     .filter(key => Metadata[key].language === 'en')
     .forEach(key => {
-      let doc = Metadata[key];
-      let docUrl = utils.getPath(doc.permalink, siteConfig.cleanUrl);
-      let links = enabledLanguages.map(lang => {
-        let langUrl = docUrl.replace('docs/en/', `docs/${lang.tag}/`);
+      const doc = Metadata[key];
+      const docUrl = utils.getPath(doc.permalink, siteConfig.cleanUrl);
+      const links = enabledLanguages.map(lang => {
+        const langUrl = docUrl.replace('docs/en/', `docs/${lang.tag}/`);
         return {lang: lang.tag, url: langUrl};
       });
       urls.push({
diff --git a/lib/server/translate.js b/lib/server/translate.js
index 7d46f90063b9..c1cb91582342 100644
--- a/lib/server/translate.js
+++ b/lib/server/translate.js
@@ -38,7 +38,7 @@ function translate(str) {
   if (!language || language === '') {
     // Check English, just in case; otherwise, just return the raw string back
     if (doesTranslationExist(str, 'en')) {
-      return parseEscapeSequences(translation['en']['pages-strings'][str]);
+      return parseEscapeSequences(translation.en['pages-strings'][str]);
     }
     return str;
   }
@@ -54,7 +54,7 @@ function translate(str) {
           "'. Using English version instead."
       );
 
-      return parseEscapeSequences(translation['en']['pages-strings'][str]);
+      return parseEscapeSequences(translation.en['pages-strings'][str]);
     }
     throw new Error(
       "Text that you've identified for translation ('" +
@@ -66,6 +66,6 @@ function translate(str) {
 }
 
 module.exports = {
-  setLanguage: setLanguage,
-  translate: translate,
+  setLanguage,
+  translate,
 };
diff --git a/lib/server/utils.js b/lib/server/utils.js
index dd90d8ee1be8..d4598f8ffc57 100644
--- a/lib/server/utils.js
+++ b/lib/server/utils.js
@@ -24,7 +24,7 @@ function getSubDir(file, refDir) {
 //  (file: '/website/translated_docs/ko/projectA/test.md', refDir: 'website/translated_docs')
 //  returns 'ko'
 function getLanguage(file, refDir) {
-  let regexSubFolder = new RegExp(
+  const regexSubFolder = new RegExp(
     '/' + escapeStringRegexp(path.basename(refDir)) + '/(.*)/.*/'
   );
   const match = regexSubFolder.exec(file);
diff --git a/lib/server/versionFallback.js b/lib/server/versionFallback.js
index be11819da188..20a3d46b0f36 100644
--- a/lib/server/versionFallback.js
+++ b/lib/server/versionFallback.js
@@ -14,6 +14,7 @@ const metadataUtils = require('./metadataUtils');
 
 const env = require('./env.js');
 const utils = require('./utils.js');
+
 const siteConfig = require(CWD + '/siteConfig.js');
 
 const ENABLE_TRANSLATION = fs.existsSync(CWD + '/languages.js');
@@ -46,7 +47,7 @@ const available = {};
 // versionFiles is used to keep track of what file to use with a
 // given version/id of a document
 const versionFiles = {};
-let files = glob.sync(versionFolder + '**');
+const files = glob.sync(versionFolder + '**');
 files.forEach(file => {
   const ext = path.extname(file);
   if (ext !== '.md' && ext !== '.markdown') {
diff --git a/lib/version.js b/lib/version.js
index a4a2d0e07441..18d31219ede0 100755
--- a/lib/version.js
+++ b/lib/version.js
@@ -80,7 +80,7 @@ const versionFolder = CWD + '/versioned_docs/version-' + version;
 mkdirp.sync(versionFolder);
 
 // copy necessary files to new version, changing some of its metadata to reflect the versioning
-let files = glob.sync(CWD + '/../' + readMetadata.getDocsPath() + '/**');
+const files = glob.sync(CWD + '/../' + readMetadata.getDocsPath() + '/**');
 files.forEach(file => {
   const ext = path.extname(file);
   if (ext !== '.md' && ext !== '.markdown') {
@@ -88,12 +88,12 @@ files.forEach(file => {
   }
 
   const res = metadataUtils.extractMetadata(fs.readFileSync(file, 'utf8'));
-  let metadata = res.metadata;
+  const metadata = res.metadata;
   // Don't version any docs without any metadata whatsoever.
   if (Object.keys(metadata).length === 0) {
     return;
   }
-  let rawContent = res.rawContent;
+  const rawContent = res.rawContent;
   if (!metadata.id) {
     metadata.id = path.basename(file, path.extname(file));
   }
diff --git a/lib/write-translations.js b/lib/write-translations.js
index 55a159ef54d8..47bfb1d7cd97 100755
--- a/lib/write-translations.js
+++ b/lib/write-translations.js
@@ -27,6 +27,7 @@ const mkdirp = require('mkdirp');
 const nodePath = require('path');
 
 const readMetadata = require('./server/readMetadata.js');
+
 const CWD = process.cwd();
 const siteConfig = require(CWD + '/siteConfig.js');
 const sidebars = require(CWD + '/sidebars.json');
@@ -47,7 +48,7 @@ function writeFileAndCreateFolder(file, content) {
 }
 
 function execute() {
-  let translations = {
+  const translations = {
     'localized-strings': {
       next: 'Next',
       previous: 'Previous',
diff --git a/package.json b/package.json
index 409157796653..92d42329cc51 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,8 @@
     "precommit": "lint-staged",
     "prettier": "yarn format:source && yarn format:examples",
     "prettier:diff": "yarn nit:source && yarn nit:examples",
-    "test": "jest"
+    "test": "jest",
+    "start": "cd website && yarn start"
   },
   "lint-staged": {
     "linters": {
diff --git a/website/pages/en/about-slash.js b/website/pages/en/about-slash.js
index 2fef9452f6d8..b6047e6ed386 100644
--- a/website/pages/en/about-slash.js
+++ b/website/pages/en/about-slash.js
@@ -9,6 +9,7 @@
 
 const React = require('react');
 const CompLibrary = require('../../core/CompLibrary.js');
+
 const Container = CompLibrary.Container;
 const siteConfig = require(process.cwd() + '/siteConfig.js');
 const translate = require('../../server/translate.js').translate;
diff --git a/website/pages/en/help.js b/website/pages/en/help.js
index 999b17060f6b..9bc40b2289a0 100755
--- a/website/pages/en/help.js
+++ b/website/pages/en/help.js
@@ -7,6 +7,7 @@
 
 const React = require('react');
 const CompLibrary = require('../../core/CompLibrary.js');
+
 const Container = CompLibrary.Container;
 const GridBlock = CompLibrary.GridBlock;
 const siteConfig = require(process.cwd() + '/siteConfig.js');
diff --git a/website/pages/en/index.js b/website/pages/en/index.js
index e2a0735c4c3c..58b2f3c2d3d5 100755
--- a/website/pages/en/index.js
+++ b/website/pages/en/index.js
@@ -7,6 +7,7 @@
 
 const React = require('react');
 const CompLibrary = require('../../core/CompLibrary.js');
+
 const Container = CompLibrary.Container;
 const GridBlock = CompLibrary.GridBlock;
 const siteConfig = require(process.cwd() + '/siteConfig.js');
@@ -72,7 +73,7 @@ class HomeSplash extends React.Component {
 
 class Index extends React.Component {
   render() {
-    let language = this.props.language || 'en';
+    const language = this.props.language || 'en';
     const showcase = siteConfig.users.filter(user => user.pinned).map(user => (
       <a href={user.infoLink} key={user.infoLink}>
         <img src={user.image} alt={user.caption} title={user.caption} />
@@ -226,7 +227,7 @@ class Index extends React.Component {
           </Container>
           <div className="productShowcaseSection paddingBottom">
             <h2>
-              <translate>Who's Using Docusaurus?</translate>
+              <translate>Who is Using Docusaurus?</translate>
             </h2>
             <p>
               <translate>
diff --git a/website/pages/en/users.js b/website/pages/en/users.js
index 67525605f92c..67b598609ddd 100644
--- a/website/pages/en/users.js
+++ b/website/pages/en/users.js
@@ -7,6 +7,7 @@
 
 const React = require('react');
 const CompLibrary = require('../../core/CompLibrary.js');
+
 const Container = CompLibrary.Container;
 const siteConfig = require(process.cwd() + '/siteConfig.js');
 const translate = require('../../server/translate.js').translate;
@@ -38,7 +39,7 @@ class Users extends React.Component {
                 <translate>Who is using Docusaurus?</translate>
               </h1>
               <p>
-                Docusaurus powers some of Facebook's popular{' '}
+                Docusaurus powers some of Facebook&apos;s popular{' '}
                 <a href="https://code.facebook.com/projects/">
                   open source projects
                 </a>.
diff --git a/website/pages/en/versions.js b/website/pages/en/versions.js
index 8f9d4f42406e..6cc4d17ccdc2 100644
--- a/website/pages/en/versions.js
+++ b/website/pages/en/versions.js
@@ -8,6 +8,7 @@
 const React = require('react');
 
 const CompLibrary = require('../../core/CompLibrary');
+
 const Container = CompLibrary.Container;
 
 const CWD = process.cwd();
diff --git a/website/static/js/code-blocks-buttons.js b/website/static/js/code-blocks-buttons.js
index 052a8fa7c4dc..a9435d83f3c6 100644
--- a/website/static/js/code-blocks-buttons.js
+++ b/website/static/js/code-blocks-buttons.js
@@ -31,6 +31,8 @@ window.addEventListener('load', function() {
   );
 
   const clipboard = new ClipboardJS('.btnClipboard', {
+    // Not gonna use the shorthand as this file is sent down to browsers without transpiling.
+    /* eslint-disable object-shorthand */
     target: function(trigger) {
       return trigger.parentNode.querySelector('code');
     },