diff --git a/.eslintrc.js b/.eslintrc.js
index 04b0f3ed1a58..b2901d3b1423 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -15,12 +15,15 @@ module.exports = {
     'no-console': OFF, // We have console.error, console.warn, etc.
     radix: ERROR,
     'class-methods-use-this': OFF,
+    'func-names': OFF,
     'no-empty': [ERROR, {allowEmptyCatch: true}],
     'no-param-reassign': OFF,
     'no-plusplus': OFF,
+    'prefer-template': 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/jsx-one-expression-per-line': OFF, // Formatting is left to Prettier.
     '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: ['>', '}']}],
@@ -32,14 +35,10 @@ module.exports = {
     'jsx-a11y/anchor-is-valid': OFF, // 9
     'import/no-unresolved': OFF, // 15
     'react/prefer-stateless-function': OFF, // 22
-    'prefer-arrow-callback': OFF, // 30
-    'func-names': OFF, // 37
     'import/no-dynamic-require': OFF, // 46
     'prefer-destructuring': OFF, // 69
     'global-require': OFF, // 85
-    'react/jsx-one-expression-per-line': OFF, // 129
     'react/prop-types': OFF, // 197
-    'prefer-template': OFF, // 292
     'react/destructuring-assignment': OFF, // 342
   },
 };
diff --git a/examples/basics/core/Footer.js b/examples/basics/core/Footer.js
index 41fbc0ff6f78..a9595b6f3eb6 100644
--- a/examples/basics/core/Footer.js
+++ b/examples/basics/core/Footer.js
@@ -10,12 +10,12 @@ const React = require('react');
 class Footer extends React.Component {
   docUrl(doc, language) {
     const baseUrl = this.props.config.baseUrl;
-    return baseUrl + 'docs/' + (language ? language + '/' : '') + doc;
+    return `${baseUrl}docs/${language ? `${language}/` : ''}${doc}`;
   }
 
   pageUrl(doc, language) {
     const baseUrl = this.props.config.baseUrl;
-    return baseUrl + (language ? language + '/' : '') + doc;
+    return baseUrl + (language ? `${language}/` : '') + doc;
   }
 
   render() {
@@ -65,7 +65,7 @@ class Footer extends React.Component {
           </div>
           <div>
             <h5>More</h5>
-            <a href={this.props.config.baseUrl + 'blog'}>Blog</a>
+            <a href={`${this.props.config.baseUrl}blog`}>Blog</a>
             <a href="https://github.com/">GitHub</a>
             <a
               className="github-button"
@@ -86,7 +86,7 @@ class Footer extends React.Component {
           rel="noreferrer noopener"
           className="fbOpenSource">
           <img
-            src={this.props.config.baseUrl + 'img/oss_logo.png'}
+            src={`${this.props.config.baseUrl}img/oss_logo.png`}
             alt="Facebook Open Source"
             width="170"
             height="45"
diff --git a/examples/basics/pages/en/help.js b/examples/basics/pages/en/help.js
index ed5db281e1ce..f50dbbb94c83 100755
--- a/examples/basics/pages/en/help.js
+++ b/examples/basics/pages/en/help.js
@@ -12,10 +12,10 @@ const CompLibrary = require('../../core/CompLibrary.js');
 const Container = CompLibrary.Container;
 const GridBlock = CompLibrary.GridBlock;
 
-const siteConfig = require(process.cwd() + '/siteConfig.js');
+const siteConfig = require(`${process.cwd()}/siteConfig.js`);
 
 function docUrl(doc, language) {
-  return siteConfig.baseUrl + 'docs/' + (language ? language + '/' : '') + doc;
+  return `${siteConfig.baseUrl}docs/${language ? `${language}/` : ''}${doc}`;
 }
 
 class Help extends React.Component {
diff --git a/examples/basics/pages/en/index.js b/examples/basics/pages/en/index.js
index 9bdd2743b31c..62f284c8a462 100755
--- a/examples/basics/pages/en/index.js
+++ b/examples/basics/pages/en/index.js
@@ -13,18 +13,18 @@ const MarkdownBlock = CompLibrary.MarkdownBlock; /* Used to read markdown */
 const Container = CompLibrary.Container;
 const GridBlock = CompLibrary.GridBlock;
 
-const siteConfig = require(process.cwd() + '/siteConfig.js');
+const siteConfig = require(`${process.cwd()}/siteConfig.js`);
 
 function imgUrl(img) {
-  return siteConfig.baseUrl + 'img/' + img;
+  return `${siteConfig.baseUrl}img/${img}`;
 }
 
 function docUrl(doc, language) {
-  return siteConfig.baseUrl + 'docs/' + (language ? language + '/' : '') + doc;
+  return `${siteConfig.baseUrl}docs/${language ? `${language}/` : ''}${doc}`;
 }
 
 function pageUrl(page, language) {
-  return siteConfig.baseUrl + (language ? language + '/' : '') + page;
+  return siteConfig.baseUrl + (language ? `${language}/` : '') + page;
 }
 
 class Button extends React.Component {
diff --git a/examples/basics/pages/en/users.js b/examples/basics/pages/en/users.js
index d741e3298101..b03fb812addf 100644
--- a/examples/basics/pages/en/users.js
+++ b/examples/basics/pages/en/users.js
@@ -11,7 +11,7 @@ const CompLibrary = require('../../core/CompLibrary.js');
 
 const Container = CompLibrary.Container;
 
-const siteConfig = require(process.cwd() + '/siteConfig.js');
+const siteConfig = require(`${process.cwd()}/siteConfig.js`);
 
 class Users extends React.Component {
   render() {
@@ -19,7 +19,7 @@ class Users extends React.Component {
       return null;
     }
 
-    const editUrl = siteConfig.repoUrl + '/edit/master/website/siteConfig.js';
+    const editUrl = `${siteConfig.repoUrl}/edit/master/website/siteConfig.js`;
     const showcase = siteConfig.users.map(user => (
       <a href={user.infoLink} key={user.infoLink}>
         <img src={user.image} alt={user.caption} title={user.caption} />
diff --git a/examples/basics/siteConfig.js b/examples/basics/siteConfig.js
index cbd6d7cbd911..627fa24ef963 100644
--- a/examples/basics/siteConfig.js
+++ b/examples/basics/siteConfig.js
@@ -73,10 +73,7 @@ const siteConfig = {
   */
 
   // 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',
+  copyright: `Copyright © ${new Date().getFullYear()} Your Name or Your Company Name`,
 
   highlight: {
     // Highlight.js theme to use for syntax highlighting in code blocks.
diff --git a/examples/versions/pages/en/versions.js b/examples/versions/pages/en/versions.js
index 6eacf2c53c06..d0895688fa67 100644
--- a/examples/versions/pages/en/versions.js
+++ b/examples/versions/pages/en/versions.js
@@ -13,8 +13,8 @@ const Container = CompLibrary.Container;
 
 const CWD = process.cwd();
 
-const siteConfig = require(CWD + '/siteConfig.js');
-const versions = require(CWD + '/versions.json');
+const siteConfig = require(`${CWD}/siteConfig.js`);
+const versions = require(`${CWD}/versions.json`);
 
 function Versions() {
   const latestVersion = versions[0];
diff --git a/lib/__tests__/build-files.test.js b/lib/__tests__/build-files.test.js
index afd1fc7d55ab..129756787975 100644
--- a/lib/__tests__/build-files.test.js
+++ b/lib/__tests__/build-files.test.js
@@ -16,10 +16,10 @@ 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';
-const staticCSSDir = CWD + '/website/static/css';
+const siteConfig = require(`${CWD}/website/siteConfig.js`);
+const buildDir = `${CWD}/website/build`;
+const docsDir = `${CWD}/docs`;
+const staticCSSDir = `${CWD}/website/static/css`;
 
 let inputMarkdownFiles = [];
 let inputAssetsFiles = [];
@@ -43,11 +43,11 @@ describe('Build files', () => {
   beforeAll(() => {
     generateSite();
     return Promise.all([
-      glob(docsDir + '/**/*.md'),
-      glob(buildDir + '/' + siteConfig.projectName + '/docs/**/*.html'),
-      glob(docsDir + '/assets/*'),
-      glob(buildDir + '/' + siteConfig.projectName + '/img/*'),
-    ]).then(function(results) {
+      glob(`${docsDir}/**/*.md`),
+      glob(`${buildDir}/${siteConfig.projectName}/docs/**/*.html`),
+      glob(`${docsDir}/assets/*`),
+      glob(`${buildDir}/${siteConfig.projectName}/img/*`),
+    ]).then(results => {
       [
         inputMarkdownFiles,
         outputHTMLFiles,
@@ -61,34 +61,34 @@ describe('Build files', () => {
     clearBuildFolder();
   });
 
-  test('Build folder exists', function() {
-    return fs.stat(buildDir).then(function(status) {
+  test('Build folder exists', () =>
+    fs.stat(buildDir).then(status => {
       expect(status.isDirectory()).toBeTruthy();
-    });
-  });
+    }));
 
-  test('Generated HTML for each Markdown resource', function() {
+  test('Generated HTML for each Markdown resource', () => {
     const metadata = outputHTMLFiles.map(file =>
       filepath.create(file).basename()
     );
-    inputMarkdownFiles.forEach(function(file) {
+    inputMarkdownFiles.forEach(file => {
       const data = fs.readFileSync(file, 'utf8');
       const frontmatter = fm(data);
-      expect(metadata).toContain(frontmatter.attributes.id + '.html');
+      expect(metadata).toContain(`${frontmatter.attributes.id}.html`);
     });
   });
 
-  test('Generated table of contents', function() {
-    outputHTMLFiles.forEach(function(file) {
+  test('Generated table of contents', () => {
+    outputHTMLFiles.forEach(file => {
       const fileContents = fs.readFileSync(file, 'utf8');
       expect(fileContents).not.toContain('<AUTOGENERATED_TABLE_OF_CONTENTS>');
     });
   });
 
-  test('Concatenated CSS files', async function() {
-    const inputFiles = await glob(staticCSSDir + '/*.css');
-    const combinedCSSFile =
-      buildDir + '/' + siteConfig.projectName + '/css/main.css';
+  test('Concatenated CSS files', async () => {
+    const inputFiles = await glob(`${staticCSSDir}/*.css`);
+    const combinedCSSFile = `${buildDir}/${
+      siteConfig.projectName
+    }/css/main.css`;
     const fileContents = await Promise.all(
       [combinedCSSFile, ...inputFiles].map(file => fs.readFile(file, 'utf8'))
     );
@@ -103,11 +103,11 @@ describe('Build files', () => {
     });
   });
 
-  test('Copied assets from /docs/assets', function() {
+  test('Copied assets from /docs/assets', () => {
     const metadata = outputAssetsFiles.map(file =>
       filepath.create(file).basename()
     );
-    inputAssetsFiles.forEach(function(file) {
+    inputAssetsFiles.forEach(file => {
       const path = filepath.create(file);
       expect(metadata).toContain(path.basename());
     });
diff --git a/lib/build-files.js b/lib/build-files.js
index 940669c4ce04..83ed4ceaa9ed 100755
--- a/lib/build-files.js
+++ b/lib/build-files.js
@@ -10,7 +10,7 @@
 require('babel-polyfill');
 require('babel-register')({
   babelrc: false,
-  only: [__dirname, process.cwd() + '/core'],
+  only: [__dirname, `${process.cwd()}/core`],
   plugins: [
     require('./server/translate-plugin.js'),
     'transform-class-properties',
@@ -25,7 +25,7 @@ const fs = require('fs');
 
 const CWD = process.cwd();
 
-if (!fs.existsSync(CWD + '/siteConfig.js')) {
+if (!fs.existsSync(`${CWD}/siteConfig.js`)) {
   console.error(
     chalk.red('Error: No siteConfig.js file found in website folder!')
   );
diff --git a/lib/copy-examples.js b/lib/copy-examples.js
index 72b6c2209dba..1247b2c643f4 100755
--- a/lib/copy-examples.js
+++ b/lib/copy-examples.js
@@ -25,9 +25,9 @@ commander
   .parse(process.argv);
 
 // add scripts to package.json file
-if (fs.existsSync(CWD + '/package.json')) {
+if (fs.existsSync(`${CWD}/package.json`)) {
   const packageContent = JSON.parse(
-    fs.readFileSync(CWD + '/package.json', 'utf8')
+    fs.readFileSync(`${CWD}/package.json`, 'utf8')
   );
   if (!packageContent.scripts) {
     packageContent.scripts = {};
@@ -41,8 +41,8 @@ if (fs.existsSync(CWD + '/package.json')) {
   packageContent.scripts.version = 'docusaurus-version';
   packageContent.scripts['rename-version'] = 'docusaurus-rename-version';
   fs.writeFileSync(
-    CWD + '/package.json',
-    JSON.stringify(packageContent, null, 2) + '\n'
+    `${CWD}/package.json`,
+    `${JSON.stringify(packageContent, null, 2)}\n`
   );
   console.log(
     `${chalk.green('Wrote docusaurus scripts to package.json file.')}\n`
@@ -59,17 +59,17 @@ let exampleSiteCreated = false;
 if (feature === 'translations') {
   // copy files for translations
   const folder = path.join(__dirname, '..', 'examples', 'translations');
-  if (fs.existsSync(CWD + '/../crowdin.yaml')) {
+  if (fs.existsSync(`${CWD}/../crowdin.yaml`)) {
     console.log(
       `${chalk.yellow('crowdin.yaml already exists')} in ${chalk.yellow(
-        outerFolder + '/'
+        `${outerFolder}/`
       )}. Rename or remove the file to regenerate an example version.\n`
     );
   } else {
-    fs.copySync(folder + '/crowdin.yaml', CWD + '/../crowdin.yaml');
+    fs.copySync(`${folder}/crowdin.yaml`, `${CWD}/../crowdin.yaml`);
     exampleSiteCreated = true;
   }
-  const files = glob.sync(folder + '/**/*');
+  const files = glob.sync(`${folder}/**/*`);
   files.forEach(file => {
     if (fs.lstatSync(file).isDirectory()) {
       return;
@@ -87,9 +87,9 @@ if (feature === 'translations') {
     } catch (e) {
       console.log(
         `${chalk.yellow(
-          path.basename(filePath) + ' already exists'
+          `${path.basename(filePath)} already exists`
         )} in ${chalk.yellow(
-          'website' + filePath.split(path.basename(filePath))[0]
+          `website${filePath.split(path.basename(filePath))[0]}`
         )}. Rename or remove the file to regenerate an example version.\n`
       );
     }
@@ -97,7 +97,7 @@ if (feature === 'translations') {
 } else if (feature === 'versions') {
   // copy files for versions
   const folder = path.join(__dirname, '..', 'examples', 'versions');
-  const files = glob.sync(folder + '/**/*');
+  const files = glob.sync(`${folder}/**/*`);
   files.forEach(file => {
     if (fs.lstatSync(file).isDirectory()) {
       return;
@@ -112,9 +112,9 @@ if (feature === 'translations') {
     } catch (e) {
       console.log(
         `${chalk.yellow(
-          path.basename(filePath) + ' already exists'
+          `${path.basename(filePath)} already exists`
         )} in ${chalk.yellow(
-          'website' + filePath.split(path.basename(filePath))[0]
+          `website${filePath.split(path.basename(filePath))[0]}`
         )}. Rename or remove the file to regenerate an example version.\n`
       );
     }
@@ -122,29 +122,29 @@ if (feature === 'translations') {
 } else {
   const folder = path.join(__dirname, '..', 'examples', 'basics');
   // copy docs examples
-  if (fs.existsSync(CWD + '/../docs-examples-from-docusaurus')) {
+  if (fs.existsSync(`${CWD}/../docs-examples-from-docusaurus`)) {
     console.log(
       `${chalk.yellow(
         'Example docs already exist!'
       )} Rename or remove ${chalk.yellow(
-        outerFolder + '/docs-examples-from-docusaurus'
+        `${outerFolder}/docs-examples-from-docusaurus`
       )} to regenerate example docs.\n`
     );
   } else {
     fs.copySync(
-      folder + '/docs-examples-from-docusaurus',
-      CWD + '/../docs-examples-from-docusaurus'
+      `${folder}/docs-examples-from-docusaurus`,
+      `${CWD}/../docs-examples-from-docusaurus`
     );
     exampleSiteCreated = true;
     docsCreated = true;
   }
   // copy blog examples
-  if (fs.existsSync(CWD + '/blog-examples-from-docusaurus')) {
+  if (fs.existsSync(`${CWD}/blog-examples-from-docusaurus`)) {
     console.log(
       `${chalk.yellow(
         'Example blog posts already exist!'
       )} Rename or remove ${chalk.yellow(
-        outerFolder + '/website/blog-examples-from-docusaurus'
+        `${outerFolder}/website/blog-examples-from-docusaurus`
       )} to regenerate example blog posts.\n`
     );
   } else {
@@ -157,7 +157,7 @@ if (feature === 'translations') {
   }
   // copy .gitignore file
   let gitignoreName = '.gitignore';
-  if (fs.existsSync(CWD + '/../.gitignore')) {
+  if (fs.existsSync(`${CWD}/../.gitignore`)) {
     gitignoreName = '.gitignore-example-from-docusaurus';
     console.log(
       `${chalk.yellow('.gitignore already exists')} in ${chalk.yellow(
@@ -167,11 +167,11 @@ if (feature === 'translations') {
   }
   fs.copySync(
     path.join(folder, 'gitignore'),
-    path.join(CWD, '/../' + gitignoreName)
+    path.join(CWD, `/../${gitignoreName}`)
   );
 
   // copy other files
-  const files = glob.sync(folder + '/**/*');
+  const files = glob.sync(`${folder}/**/*`);
   files.forEach(file => {
     if (fs.lstatSync(file).isDirectory()) {
       return;
@@ -194,9 +194,9 @@ if (feature === 'translations') {
     } catch (e) {
       console.log(
         `${chalk.yellow(
-          path.basename(filePath) + ' already exists'
+          `${path.basename(filePath)} already exists`
         )} in ${chalk.yellow(
-          'website' + filePath.split(path.basename(filePath))[0]
+          `website${filePath.split(path.basename(filePath))[0]}`
         )}. Rename or remove the file to regenerate an example version.\n`
       );
     }
@@ -221,9 +221,9 @@ if (feature === 'translations') {
 if (docsCreated) {
   console.log(
     `Rename ${chalk.yellow(
-      outerFolder + '/docs-examples-from-docusaurus'
+      `${outerFolder}/docs-examples-from-docusaurus`
     )} to ${chalk.yellow(
-      outerFolder + '/docs'
+      `${outerFolder}/docs`
     )} to see the example docs on your site.\n`
   );
 }
@@ -231,9 +231,9 @@ if (docsCreated) {
 if (blogCreated) {
   console.log(
     `Rename ${chalk.yellow(
-      outerFolder + '/website/blog-examples-from-docusaurus'
+      `${outerFolder}/website/blog-examples-from-docusaurus`
     )} to ${chalk.yellow(
-      outerFolder + '/website/blog'
+      `${outerFolder}/website/blog`
     )} to see the example blog posts on your site.\n`
   );
 }
diff --git a/lib/core/BlogPageLayout.js b/lib/core/BlogPageLayout.js
index 2ac9248b05d0..25098e6eec73 100644
--- a/lib/core/BlogPageLayout.js
+++ b/lib/core/BlogPageLayout.js
@@ -16,9 +16,9 @@ const utils = require('./utils.js');
 // used to generate entire blog pages, i.e. collection of truncated blog posts
 class BlogPageLayout extends React.Component {
   getPageURL(page) {
-    let url = this.props.config.baseUrl + 'blog/';
+    let url = `${this.props.config.baseUrl}blog/`;
     if (page > 0) {
-      url += 'page' + (page + 1) + '/';
+      url += `page${page + 1}/`;
     }
     return url;
   }
diff --git a/lib/core/BlogPost.js b/lib/core/BlogPost.js
index a75e4bc5e0a1..da61433d71a5 100644
--- a/lib/core/BlogPost.js
+++ b/lib/core/BlogPost.js
@@ -23,14 +23,10 @@ class BlogPost extends React.Component {
             <div className="read-more">
               <a
                 className="button"
-                href={
-                  this.props.config.baseUrl +
-                  'blog/' +
-                  utils.getPath(
-                    this.props.post.path,
-                    this.props.config.cleanUrl
-                  )
-                }>
+                href={`${this.props.config.baseUrl}blog/${utils.getPath(
+                  this.props.post.path,
+                  this.props.config.cleanUrl
+                )}`}>
                 Read More
               </a>
             </div>
@@ -43,9 +39,9 @@ class BlogPost extends React.Component {
 
   renderAuthorPhoto() {
     const post = this.props.post;
-    const className =
-      'authorPhoto' +
-      (post.author && post.authorTitle ? ' authorPhotoBig' : '');
+    const className = `authorPhoto${
+      post.author && post.authorTitle ? ' authorPhotoBig' : ''
+    }`;
     if (post.authorFBID || post.authorImageURL) {
       const authorImageURL = post.authorFBID
         ? `https://graph.facebook.com/${
@@ -68,11 +64,10 @@ class BlogPost extends React.Component {
     return (
       <h1 className="postHeaderTitle">
         <a
-          href={
-            this.props.config.baseUrl +
-            'blog/' +
-            utils.getPath(post.path, this.props.config.cleanUrl)
-          }>
+          href={`${this.props.config.baseUrl}blog/${utils.getPath(
+            post.path,
+            this.props.config.cleanUrl
+          )}`}>
           {post.title}
         </a>
       </h1>
diff --git a/lib/core/BlogPostLayout.js b/lib/core/BlogPostLayout.js
index d39325aceb7e..bec30776e5ba 100644
--- a/lib/core/BlogPostLayout.js
+++ b/lib/core/BlogPostLayout.js
@@ -38,12 +38,8 @@ class BlogPostLayout extends React.Component {
           {/* Facebook SDK require 'fb-comments' class */}
           <div
             className="fb-comments"
-            data-href={
-              this.props.config.url +
-              this.props.config.baseUrl +
-              'blog/' +
-              post.path
-            }
+            data-href={`${this.props.config.url +
+              this.props.config.baseUrl}blog/${post.path}`}
             data-width="100%"
             data-numposts="5"
             data-order-by="time"
@@ -56,12 +52,8 @@ class BlogPostLayout extends React.Component {
         {/* Facebook SDK require 'fb-like' class */}
         <div
           className="fb-like"
-          data-href={
-            this.props.config.url +
-            this.props.config.baseUrl +
-            'blog/' +
-            post.path
-          }
+          data-href={`${this.props.config.url +
+            this.props.config.baseUrl}blog/${post.path}`}
           data-layout="standard"
           data-share="true"
           data-width="225"
@@ -76,12 +68,9 @@ class BlogPostLayout extends React.Component {
           href="https://twitter.com/share"
           className="twitter-share-button"
           data-text={post.title}
-          data-url={
-            this.props.config.url +
-            this.props.config.baseUrl +
-            'blog/' +
+          data-url={`${this.props.config.url + this.props.config.baseUrl}blog/${
             post.path
-          }
+          }`}
           data-related={this.props.config.twitter}
           data-via={post.authorTwitter}
           data-show-count="false">
@@ -109,7 +98,7 @@ class BlogPostLayout extends React.Component {
         className={classNames('sideNavVisible', {
           separateOnPageNav: hasOnPageNav,
         })}
-        url={'blog/' + post.path}
+        url={`blog/${post.path}`}
         title={this.props.metadata.title}
         language="en"
         description={this.getDescription()}
@@ -132,7 +121,7 @@ class BlogPostLayout extends React.Component {
               {this.renderSocialButtons()}
             </div>
             <div className="blog-recent">
-              <a className="button" href={this.props.config.baseUrl + 'blog'}>
+              <a className="button" href={`${this.props.config.baseUrl}blog`}>
                 {blogSidebarTitleConfig.default || 'Recent Posts'}
               </a>
             </div>
diff --git a/lib/core/BlogSidebar.js b/lib/core/BlogSidebar.js
index 80b52116ac81..dfc3aaeb8794 100644
--- a/lib/core/BlogSidebar.js
+++ b/lib/core/BlogSidebar.js
@@ -41,7 +41,7 @@ class BlogSidebar extends React.Component {
       <Container className="docsNavContainer" id="docsNav" wrapper={false}>
         <SideNav
           language={this.props.language}
-          root={this.props.config.baseUrl + 'blog/'}
+          root={`${this.props.config.baseUrl}blog/`}
           title="Blog"
           contents={contents}
           current={current}
diff --git a/lib/core/Doc.js b/lib/core/Doc.js
index a9b0c7ee58cc..9c15e9542b6c 100644
--- a/lib/core/Doc.js
+++ b/lib/core/Doc.js
@@ -49,11 +49,9 @@ class Doc extends React.Component {
       editLink = (
         <a
           className="edit-page-link button"
-          href={
-            this.props.config.translationRecruitingLink +
-            '/' +
+          href={`${this.props.config.translationRecruitingLink}/${
             this.props.language
-          }
+          }`}
           target="_blank"
           rel="noreferrer noopener">
           {translateThisDoc}
diff --git a/lib/core/Head.js b/lib/core/Head.js
index b939c3dc9250..8f8c5f5d51b8 100644
--- a/lib/core/Head.js
+++ b/lib/core/Head.js
@@ -27,9 +27,9 @@ class Head extends React.Component {
         }/styles/${highlight.theme}.min.css`;
 
     // ensure the siteUrl variable ends with a single slash
-    const siteUrl =
-      (this.props.config.url + this.props.config.baseUrl).replace(/\/+$/, '') +
-      '/';
+    const siteUrl = `${(
+      this.props.config.url + this.props.config.baseUrl
+    ).replace(/\/+$/, '')}/`;
 
     return (
       <head>
@@ -64,7 +64,7 @@ class Head extends React.Component {
         )}
         {this.props.config.noIndex && <meta name="robots" content="noindex" />}
         {this.props.redirect && (
-          <meta httpEquiv="refresh" content={'0; URL=' + this.props.redirect} />
+          <meta httpEquiv="refresh" content={`0; URL=${this.props.redirect}`} />
         )}
         <link
           rel="shortcut icon"
@@ -81,16 +81,16 @@ class Head extends React.Component {
           <link
             rel="alternate"
             type="application/atom+xml"
-            href={siteUrl + 'blog/atom.xml'}
-            title={this.props.config.title + ' Blog ATOM Feed'}
+            href={`${siteUrl}blog/atom.xml`}
+            title={`${this.props.config.title} Blog ATOM Feed`}
           />
         )}
         {hasBlog && (
           <link
             rel="alternate"
             type="application/rss+xml"
-            href={siteUrl + 'blog/feed.xml'}
-            title={this.props.config.title + ' Blog RSS Feed'}
+            href={`${siteUrl}blog/feed.xml`}
+            title={`${this.props.config.title} Blog RSS Feed`}
           />
         )}
         {this.props.config.gaTrackingId &&
@@ -167,13 +167,13 @@ class Head extends React.Component {
         {this.props.config.usePrism && (
           <link
             rel="stylesheet"
-            href={this.props.config.baseUrl + 'css/prism.css'}
+            href={`${this.props.config.baseUrl}css/prism.css`}
           />
         )}
         {/* Site defined code. Keep these at the end to avoid overriding. */}
         <link
           rel="stylesheet"
-          href={this.props.config.baseUrl + 'css/main.css'}
+          href={`${this.props.config.baseUrl}css/main.css`}
         />
       </head>
     );
diff --git a/lib/core/Redirect.js b/lib/core/Redirect.js
index a719ee532a5b..2b3014bbb9a9 100644
--- a/lib/core/Redirect.js
+++ b/lib/core/Redirect.js
@@ -16,9 +16,9 @@ class Redirect extends React.Component {
       ? translation[this.props.language]['localized-strings'].tagline
       : this.props.config.tagline;
     const title = this.props.title
-      ? this.props.title + ' · ' + this.props.config.title
+      ? `${this.props.title} · ${this.props.config.title}`
       : (!this.props.config.disableTitleTagline &&
-          this.props.config.title + ' · ' + tagline) ||
+          `${this.props.config.title} · ${tagline}`) ||
         this.props.config.title;
     const description = this.props.description || tagline;
     const url =
diff --git a/lib/core/Site.js b/lib/core/Site.js
index d6037b052200..fa31cd36f6f9 100644
--- a/lib/core/Site.js
+++ b/lib/core/Site.js
@@ -11,7 +11,7 @@ const fs = require('fs');
 const HeaderNav = require('./nav/HeaderNav.js');
 const Head = require('./Head.js');
 
-const Footer = require(process.cwd() + '/core/Footer.js');
+const Footer = require(`${process.cwd()}/core/Footer.js`);
 const translation = require('../server/translation.js');
 const constants = require('./constants');
 
@@ -24,9 +24,9 @@ class Site extends React.Component {
       ? translation[this.props.language]['localized-strings'].tagline
       : this.props.config.tagline;
     const title = this.props.title
-      ? this.props.title + ' · ' + this.props.config.title
+      ? `${this.props.title} · ${this.props.config.title}`
       : (!this.props.config.disableTitleTagline &&
-          this.props.config.title + ' · ' + tagline) ||
+          `${this.props.config.title} · ${tagline}`) ||
         this.props.config.title;
     const description = this.props.description || tagline;
     const url =
@@ -35,8 +35,8 @@ class Site extends React.Component {
       (this.props.url || 'index.html');
     let docsVersion = this.props.version;
 
-    if (!docsVersion && fs.existsSync(CWD + '/versions.json')) {
-      const latestVersion = require(CWD + '/versions.json')[0];
+    if (!docsVersion && fs.existsSync(`${CWD}/versions.json`)) {
+      const latestVersion = require(`${CWD}/versions.json`)[0];
       docsVersion = latestVersion;
     }
 
diff --git a/lib/core/anchors.js b/lib/core/anchors.js
index ce6ec27bbae7..626a775db947 100644
--- a/lib/core/anchors.js
+++ b/lib/core/anchors.js
@@ -19,15 +19,9 @@ function anchors(md) {
     if (textToken.content) {
       const anchor = toSlug(textToken.content, env);
 
-      return (
-        '<h' +
-        tokens[idx].hLevel +
-        '><a class="anchor" aria-hidden="true" id="' +
-        anchor +
-        '"></a><a href="#' +
-        anchor +
-        '" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>'
-      );
+      return `<h${
+        tokens[idx].hLevel
+      }><a class="anchor" aria-hidden="true" id="${anchor}"></a><a href="#${anchor}" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>`;
     }
 
     return originalRender(tokens, idx, options, env);
diff --git a/lib/core/nav/HeaderNav.js b/lib/core/nav/HeaderNav.js
index 7035074d8eb8..f4be273ccc98 100644
--- a/lib/core/nav/HeaderNav.js
+++ b/lib/core/nav/HeaderNav.js
@@ -11,7 +11,7 @@ const React = require('react');
 const fs = require('fs');
 const classNames = require('classnames');
 
-const siteConfig = require(CWD + '/siteConfig.js');
+const siteConfig = require(`${CWD}/siteConfig.js`);
 const translation = require('../../server/translation.js');
 const env = require('../../server/env.js');
 
@@ -52,7 +52,7 @@ class LanguageDropDown extends React.Component {
               `/${lang.tag}/`
             );
         } else if (this.props.current.id && this.props.current.id !== 'index') {
-          href = siteConfig.baseUrl + lang.tag + '/' + this.props.current.id;
+          href = `${siteConfig.baseUrl + lang.tag}/${this.props.current.id}`;
         }
         return (
           <li key={lang.tag}>
@@ -91,7 +91,7 @@ class LanguageDropDown extends React.Component {
           <a id="languages-menu" href="#">
             <img
               className="languages-icon"
-              src={this.props.baseUrl + 'img/language.svg'}
+              src={`${this.props.baseUrl}img/language.svg`}
               alt="Languages icon"
             />
             {currentLanguage}
@@ -162,33 +162,27 @@ class HeaderNav extends React.Component {
     if (link.doc) {
       // set link to document with current page's language/version
       const langPart = env.translation.enabled
-        ? (this.props.language || 'en') + '-'
+        ? `${this.props.language || 'en'}-`
         : '';
       const versionPart =
         env.versioning.enabled && this.props.version !== 'next'
-          ? 'version-' +
-            (this.props.version || env.versioning.defaultVersion) +
-            '-'
+          ? `version-${this.props.version || env.versioning.defaultVersion}-`
           : '';
       const id = langPart + versionPart + link.doc;
       if (!Metadata[id]) {
-        let errorStr =
-          "Processing the following `doc` field in `headerLinks` within `siteConfig.js`: '" +
-          link.doc +
-          "'";
+        let errorStr = `Processing the following \`doc\` field in \`headerLinks\` within \`siteConfig.js\`: '${
+          link.doc
+        }'`;
         if (id === link.doc) {
           errorStr +=
             ' It looks like there is no document with that id that exists in your docs directory. Please double check the spelling of your `doc` field and the `id` fields of your docs.';
         } else {
-          errorStr +=
-            '. Check the spelling of your `doc` field. If that seems sane, and a document in your docs folder exists with that `id` value, \nthen this is likely a bug in Docusaurus.' +
-            ' Docusaurus thinks one or both of translations (currently set to: ' +
-            env.translation.enabled +
-            ') or versioning (currently set to: ' +
-            env.versioning.enabled +
-            ") is enabled when maybe they should not be. \nThus my internal id for this doc is: '" +
-            id +
-            "'. Please file an issue for this possible bug on GitHub.";
+          errorStr += `${'. Check the spelling of your `doc` field. If that seems sane, and a document in your docs folder exists with that `id` value, \nthen this is likely a bug in Docusaurus.' +
+            ' Docusaurus thinks one or both of translations (currently set to: '}${
+            env.translation.enabled
+          }) or versioning (currently set to: ${
+            env.versioning.enabled
+          }) is enabled when maybe they should not be. \nThus my internal id for this doc is: '${id}'. Please file an issue for this possible bug on GitHub.`;
         }
         throw new Error(errorStr);
       }
@@ -202,10 +196,10 @@ class HeaderNav extends React.Component {
     } else if (link.page) {
       // set link to page with current page's language if appropriate
       const language = this.props.language || '';
-      if (fs.existsSync(CWD + '/pages/en/' + link.page + '.js')) {
+      if (fs.existsSync(`${CWD}/pages/en/${link.page}.js`)) {
         href =
           siteConfig.baseUrl +
-          (language ? language + '/' : '') +
+          (language ? `${language}/` : '') +
           link.page +
           extension;
       } else {
@@ -216,7 +210,7 @@ class HeaderNav extends React.Component {
       href = link.href;
     } else if (link.blog) {
       // set link to blog url
-      href = this.props.baseUrl + 'blog';
+      href = `${this.props.baseUrl}blog`;
     }
     const itemClasses = classNames({
       siteNavGroupActive:
@@ -227,7 +221,7 @@ class HeaderNav extends React.Component {
         (link.page && link.page === this.props.current.id),
     });
     return (
-      <li key={link.label + 'page'} className={itemClasses}>
+      <li key={`${link.label}page`} className={itemClasses}>
         <a href={href} target={link.external ? '_blank' : '_self'}>
           {translation[this.props.language]
             ? translation[this.props.language]['localized-strings'][link.label]
@@ -253,24 +247,22 @@ class HeaderNav extends React.Component {
     headerLinks.forEach(link => {
       if (
         link.doc &&
-        !fs.existsSync(CWD + '/../' + readMetadata.getDocsPath() + '/')
+        !fs.existsSync(`${CWD}/../${readMetadata.getDocsPath()}/`)
       ) {
         throw new Error(
-          "You have 'doc' in your headerLinks, but no '" +
-            readMetadata.getDocsPath() +
-            "' folder exists one level up from " +
-            "'website' folder. Did you run `docusaurus-init` or `npm run examples`? If so, " +
-            "make sure you rename 'docs-examples-from-docusaurus' to 'docs'."
+          `You have 'doc' in your headerLinks, but no '${readMetadata.getDocsPath()}' folder exists one level up from ` +
+            `'website' folder. Did you run \`docusaurus-init\` or \`npm run examples\`? If so, ` +
+            `make sure you rename 'docs-examples-from-docusaurus' to 'docs'.`
         );
       }
-      if (link.blog && !fs.existsSync(CWD + '/blog/')) {
+      if (link.blog && !fs.existsSync(`${CWD}/blog/`)) {
         throw new Error(
           "You have 'blog' in your headerLinks, but no 'blog' folder exists in your " +
             "'website' folder. Did you run `docusaurus-init` or `npm run examples`? If so, " +
             "make sure you rename 'blog-examples-from-docusaurus' to 'blog'."
         );
       }
-      if (link.page && !fs.existsSync(CWD + '/pages/')) {
+      if (link.page && !fs.existsSync(`${CWD}/pages/`)) {
         throw new Error(
           "You have 'page' in your headerLinks, but no 'pages' folder exists in your " +
             "'website' folder."
@@ -302,8 +294,8 @@ class HeaderNav extends React.Component {
     const versionsLink =
       this.props.baseUrl +
       (env.translation.enabled
-        ? this.props.language + '/versions' + extension
-        : 'versions' + extension);
+        ? `${this.props.language}/versions${extension}`
+        : `versions${extension}`);
     return (
       <div className="fixedHeaderContainer">
         <div className="headerWrapper wrapper">
diff --git a/lib/core/nav/OnPageNav.js b/lib/core/nav/OnPageNav.js
index 2690f9564919..2ca47a260b8e 100644
--- a/lib/core/nav/OnPageNav.js
+++ b/lib/core/nav/OnPageNav.js
@@ -7,7 +7,7 @@
 
 const React = require('react');
 
-const siteConfig = require(process.cwd() + '/siteConfig.js');
+const siteConfig = require(`${process.cwd()}/siteConfig.js`);
 const getTOC = require('../getTOC');
 
 const Link = ({hashLink, content}) => (
diff --git a/lib/core/nav/SideNav.js b/lib/core/nav/SideNav.js
index 50562df0f0b3..57682c961897 100644
--- a/lib/core/nav/SideNav.js
+++ b/lib/core/nav/SideNav.js
@@ -8,7 +8,7 @@
 const React = require('react');
 const classNames = require('classnames');
 
-const siteConfig = require(process.cwd() + '/siteConfig.js');
+const siteConfig = require(`${process.cwd()}/siteConfig.js`);
 const translation = require('../../server/translation.js');
 const utils = require('../utils.js');
 
@@ -51,11 +51,10 @@ class SideNav extends React.Component {
       return siteConfig.baseUrl + targetLink;
     }
     if (metadata.path) {
-      return (
-        siteConfig.baseUrl +
-        'blog/' +
-        utils.getPath(metadata.path, siteConfig.cleanUrl)
-      );
+      return `${siteConfig.baseUrl}blog/${utils.getPath(
+        metadata.path,
+        siteConfig.cleanUrl
+      )}`;
     }
     return null;
   }
diff --git a/lib/core/renderMarkdown.js b/lib/core/renderMarkdown.js
index a3e70b4ed312..4828ad71a0a8 100644
--- a/lib/core/renderMarkdown.js
+++ b/lib/core/renderMarkdown.js
@@ -19,7 +19,7 @@ const alias = {
 
 class MarkdownRenderer {
   constructor() {
-    const siteConfig = require(CWD + '/siteConfig.js');
+    const siteConfig = require(`${CWD}/siteConfig.js`);
 
     const md = new Markdown({
       // Highlight.js expects hljs css classes on the code element.
@@ -40,7 +40,7 @@ class MarkdownRenderer {
                 const language = alias[lang] || lang;
                 // Currently people using prismjs on Node have to individually require()
                 // every single language (https://github.com/PrismJS/prism/issues/593)
-                require('prismjs/components/prism-' + language + '.min');
+                require(`prismjs/components/prism-${language}.min`);
                 return prismjs.highlight(str, prismjs.languages[language]);
               } catch (err) {
                 console.error(err);
@@ -71,7 +71,7 @@ class MarkdownRenderer {
 
     // Allow client sites to register their own plugins
     if (siteConfig.markdownPlugins) {
-      siteConfig.markdownPlugins.forEach(function(plugin) {
+      siteConfig.markdownPlugins.forEach(plugin => {
         md.use(plugin);
       });
     }
diff --git a/lib/core/toSlug.js b/lib/core/toSlug.js
index 2d9102a0e18c..263d776e4ca7 100644
--- a/lib/core/toSlug.js
+++ b/lib/core/toSlug.js
@@ -13,10 +13,7 @@ const letters =
   '\u0041-\u005A\u0061-\u007A\u00AA\u00B5\u00BA\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0\u08A2-\u08AC\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097F\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3D\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191C\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2183\u2184\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005\u3006\u3031-\u3035\u303B\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA697\uA6A0-\uA6E5\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA793\uA7A0-\uA7AA\uA7F8-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA80-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC';
 const numbers =
   '\u0030-\u0039\u00B2\u00B3\u00B9\u00BC-\u00BE\u0660-\u0669\u06F0-\u06F9\u07C0-\u07C9\u0966-\u096F\u09E6-\u09EF\u09F4-\u09F9\u0A66-\u0A6F\u0AE6-\u0AEF\u0B66-\u0B6F\u0B72-\u0B77\u0BE6-\u0BF2\u0C66-\u0C6F\u0C78-\u0C7E\u0CE6-\u0CEF\u0D66-\u0D75\u0E50-\u0E59\u0ED0-\u0ED9\u0F20-\u0F33\u1040-\u1049\u1090-\u1099\u1369-\u137C\u16EE-\u16F0\u17E0-\u17E9\u17F0-\u17F9\u1810-\u1819\u1946-\u194F\u19D0-\u19DA\u1A80-\u1A89\u1A90-\u1A99\u1B50-\u1B59\u1BB0-\u1BB9\u1C40-\u1C49\u1C50-\u1C59\u2070\u2074-\u2079\u2080-\u2089\u2150-\u2182\u2185-\u2189\u2460-\u249B\u24EA-\u24FF\u2776-\u2793\u2CFD\u3007\u3021-\u3029\u3038-\u303A\u3192-\u3195\u3220-\u3229\u3248-\u324F\u3251-\u325F\u3280-\u3289\u32B1-\u32BF\uA620-\uA629\uA6E6-\uA6EF\uA830-\uA835\uA8D0-\uA8D9\uA900-\uA909\uA9D0-\uA9D9\uAA50-\uAA59\uABF0-\uABF9\uFF10-\uFF19';
-const exceptAlphanum = new RegExp(
-  '[^' + [letters, numbers].join('') + ']',
-  'g'
-);
+const exceptAlphanum = new RegExp(`[^${[letters, numbers].join('')}]`, 'g');
 
 /**
  * Converts a string to a slug, that can be used in heading anchors
@@ -42,7 +39,7 @@ module.exports = (string, context = {}) => {
     // Handle uppercase characters
     .toLowerCase()
     // Handle accentuated characters
-    .replace(new RegExp('[' + accents + ']', 'g'), c =>
+    .replace(new RegExp(`[${accents}]`, 'g'), c =>
       without.charAt(accents.indexOf(c))
     )
     // Replace `.`, `(` and `?` with blank string like Github does
@@ -66,10 +63,10 @@ module.exports = (string, context = {}) => {
   if (typeof context.slugStats[slug] === 'number') {
     // search for an index, that will not clash with an existing headings
     while (
-      typeof context.slugStats[slug + '-' + ++context.slugStats[slug]] ===
+      typeof context.slugStats[`${slug}-${++context.slugStats[slug]}`] ===
       'number'
     );
-    slug += '-' + context.slugStats[slug];
+    slug += `-${context.slugStats[slug]}`;
   }
 
   // we are tracking both original anchors and suffixed to avoid future name
diff --git a/lib/core/unindent.js b/lib/core/unindent.js
index c1aae4e01de2..df36ea53b365 100644
--- a/lib/core/unindent.js
+++ b/lib/core/unindent.js
@@ -17,7 +17,7 @@ function unindent(code) {
 
   const indent = lines[0].match(/^\s*/)[0];
   for (let i = 0; i < lines.length; ++i) {
-    lines[i] = lines[i].replace(new RegExp('^' + indent), '');
+    lines[i] = lines[i].replace(new RegExp(`^${indent}`), '');
   }
   return lines.join('\n');
 }
diff --git a/lib/generate-feed.js b/lib/generate-feed.js
index fafdebb08c6b..6a89accb39f6 100755
--- a/lib/generate-feed.js
+++ b/lib/generate-feed.js
@@ -9,7 +9,7 @@
 
 require('babel-register')({
   babelrc: false,
-  only: [__dirname, process.cwd() + '/core'],
+  only: [__dirname, `${process.cwd()}/core`],
   plugins: [require('./server/translate-plugin.js')],
   presets: ['react', 'latest'],
 });
@@ -20,7 +20,7 @@ const fs = require('fs');
 
 const CWD = process.cwd();
 
-if (!fs.existsSync(CWD + '/siteConfig.js')) {
+if (!fs.existsSync(`${CWD}/siteConfig.js`)) {
   console.error(
     chalk.red('Error: No siteConfig.js file found in website folder!')
   );
diff --git a/lib/publish-gh-pages.js b/lib/publish-gh-pages.js
index 6460a3fd755c..1a17ab9ee73f 100755
--- a/lib/publish-gh-pages.js
+++ b/lib/publish-gh-pages.js
@@ -16,7 +16,7 @@ if (!shell.which('git')) {
   shell.exit(1);
 }
 
-const siteConfig = require(process.cwd() + '/siteConfig.js');
+const siteConfig = require(`${process.cwd()}/siteConfig.js`);
 const GIT_USER = process.env.GIT_USER;
 const CURRENT_BRANCH =
   process.env.CIRCLE_BRANCH ||
diff --git a/lib/rename-version.js b/lib/rename-version.js
index 7d41958ea52c..fe110c3de752 100755
--- a/lib/rename-version.js
+++ b/lib/rename-version.js
@@ -22,7 +22,7 @@ const CWD = process.cwd();
 function makeHeader(metadata) {
   let header = '---\n';
   Object.keys(metadata).forEach(key => {
-    header += key + ': ' + metadata[key] + '\n';
+    header += `${key}: ${metadata[key]}\n`;
   });
   header += '---\n';
   return header;
@@ -54,7 +54,7 @@ if (
 }
 
 // error if no versions currently exist
-if (!fs.existsSync(CWD + '/versions.json')) {
+if (!fs.existsSync(`${CWD}/versions.json`)) {
   console.error(
     `${chalk.yellow(
       'No versions found!'
@@ -63,14 +63,14 @@ if (!fs.existsSync(CWD + '/versions.json')) {
   process.exit(1);
 }
 
-const versions = JSON.parse(fs.readFileSync(CWD + '/versions.json', 'utf8'));
+const versions = JSON.parse(fs.readFileSync(`${CWD}/versions.json`, 'utf8'));
 
 const versionIndex = versions.indexOf(currentVersion);
 // error if current specified version does not exist
 if (versionIndex < 0) {
   console.error(
     `${chalk.yellow(
-      'Version ' + currentVersion + ' does not currently exist!'
+      `Version ${currentVersion} does not currently exist!`
     )}\n Version ${currentVersion} is not in the versions.json file. You can only rename existing versions.`
   );
   process.exit(1);
@@ -78,19 +78,19 @@ if (versionIndex < 0) {
 // replace old version with new version in versions.json file
 versions[versionIndex] = newVersion;
 fs.writeFileSync(
-  CWD + '/versions.json',
-  JSON.stringify(versions, null, 2) + '\n'
+  `${CWD}/versions.json`,
+  `${JSON.stringify(versions, null, 2)}\n`
 );
 
 // if folder of docs for this version exists, rename folder and rewrite doc
 // headers to use new version
-if (fs.existsSync(CWD + '/versioned_docs/version-' + currentVersion)) {
+if (fs.existsSync(`${CWD}/versioned_docs/version-${currentVersion}`)) {
   fs.renameSync(
-    CWD + '/versioned_docs/version-' + currentVersion,
-    CWD + '/versioned_docs/version-' + newVersion
+    `${CWD}/versioned_docs/version-${currentVersion}`,
+    `${CWD}/versioned_docs/version-${newVersion}`
   );
 
-  const files = glob.sync(CWD + '/versioned_docs/version-' + newVersion + '/*');
+  const files = glob.sync(`${CWD}/versioned_docs/version-${newVersion}/*`);
   files.forEach(file => {
     const extension = path.extname(file);
     if (extension !== '.md' && extension !== '.markdown') {
@@ -112,10 +112,8 @@ 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
-const currentSidebarFile =
-  CWD + '/versioned_sidebars/version-' + currentVersion + '-sidebars.json';
-const newSidebarFile =
-  CWD + '/versioned_sidebars/version-' + newVersion + '-sidebars.json';
+const currentSidebarFile = `${CWD}/versioned_sidebars/version-${currentVersion}-sidebars.json`;
+const newSidebarFile = `${CWD}/versioned_sidebars/version-${newVersion}-sidebars.json`;
 if (fs.existsSync(currentSidebarFile)) {
   fs.renameSync(currentSidebarFile, newSidebarFile);
   let sidebarContent = fs.readFileSync(newSidebarFile, 'utf8');
diff --git a/lib/server/env.js b/lib/server/env.js
index 96f16ffa9e3a..2812b7b0b703 100644
--- a/lib/server/env.js
+++ b/lib/server/env.js
@@ -10,7 +10,7 @@ const fs = require('fs-extra');
 const path = require('path');
 const chalk = require('chalk');
 
-const siteConfig = require(CWD + '/siteConfig.js');
+const siteConfig = require(`${CWD}/siteConfig.js`);
 
 const join = path.join;
 
diff --git a/lib/server/feed.js b/lib/server/feed.js
index 433dc8742974..1adb533067af 100644
--- a/lib/server/feed.js
+++ b/lib/server/feed.js
@@ -8,10 +8,10 @@
 const Feed = require('feed');
 
 const CWD = process.cwd();
-const siteConfig = require(CWD + '/siteConfig.js');
+const siteConfig = require(`${CWD}/siteConfig.js`);
 const readMetadata = require('./readMetadata.js');
 
-const blogRootURL = siteConfig.url + siteConfig.baseUrl + 'blog';
+const blogRootURL = `${siteConfig.url + siteConfig.baseUrl}blog`;
 const siteImageURL =
   siteConfig.url + siteConfig.baseUrl + siteConfig.headerIcon;
 const utils = require('../core/utils');
@@ -27,11 +27,10 @@ module.exports = function(type) {
   const MetadataBlog = require('../core/MetadataBlog.js');
 
   const feed = new Feed({
-    title: siteConfig.title + ' Blog',
-    description:
-      'The best place to stay up-to-date with the latest ' +
-      siteConfig.title +
-      ' news and events.',
+    title: `${siteConfig.title} Blog`,
+    description: `The best place to stay up-to-date with the latest ${
+      siteConfig.title
+    } news and events.`,
     id: blogRootURL,
     link: blogRootURL,
     image: siteImageURL,
@@ -40,7 +39,7 @@ module.exports = function(type) {
   });
 
   MetadataBlog.forEach(post => {
-    const url = blogRootURL + '/' + post.path;
+    const url = `${blogRootURL}/${post.path}`;
     const content = utils.blogPostHasTruncateMarker(post.content)
       ? utils.extractBlogPostBeforeTruncate(post.content)
       : utils.extractBlogPostSummary(post.content.trim());
diff --git a/lib/server/generate.js b/lib/server/generate.js
index c2dd40d00e40..9931bbd71fc9 100644
--- a/lib/server/generate.js
+++ b/lib/server/generate.js
@@ -23,7 +23,7 @@ async function execute() {
   const chalk = require('chalk');
   const Site = require('../core/Site.js');
   const env = require('./env.js');
-  const siteConfig = require(CWD + '/siteConfig.js');
+  const siteConfig = require(`${CWD}/siteConfig.js`);
   const translate = require('./translate.js');
   const feed = require('./feed.js');
   const sitemap = require('./sitemap.js');
@@ -164,29 +164,29 @@ async function execute() {
     Object.keys(mdToHtml).forEach(key => {
       let link = mdToHtml[key];
       link = utils.getPath(link, siteConfig.cleanUrl);
-      link = link.replace('/en/', '/' + language + '/');
+      link = link.replace('/en/', `/${language}/`);
       link = link.replace(
         '/VERSION/',
         metadata.version && metadata.version !== defaultVersion
-          ? '/' + metadata.version + '/'
+          ? `/${metadata.version}/`
           : '/'
       );
       // replace relative links without "./"
       rawContent = rawContent.replace(
-        new RegExp('\\]\\(' + key, 'g'),
-        '](' + link
+        new RegExp(`\\]\\(${key}`, 'g'),
+        `](${link}`
       );
       // replace relative links with "./"
       rawContent = rawContent.replace(
-        new RegExp('\\]\\(\\./' + key, 'g'),
-        '](' + link
+        new RegExp(`\\]\\(\\./${key}`, 'g'),
+        `](${link}`
       );
     });
 
     // replace any relative links to static assets to absolute links
     rawContent = rawContent.replace(
       /\]\(assets\//g,
-      '](' + siteConfig.baseUrl + 'docs/assets/'
+      `](${siteConfig.baseUrl}docs/assets/`
     );
 
     const docComp = (
@@ -305,7 +305,7 @@ async function execute() {
     const targetFile = join(
       buildDir,
       'blog',
-      page > 0 ? 'page' + (page + 1) : '',
+      page > 0 ? `page${page + 1}` : '',
       'index.html'
     );
     writeFileAndCreateFolder(targetFile, str);
@@ -341,7 +341,7 @@ async function execute() {
     let targetFile = path.normalize(file);
     targetFile = join(
       buildDir,
-      targetFile.split(sep + 'static' + sep)[1] || ''
+      targetFile.split(`${sep}static${sep}`)[1] || ''
     );
     // parse css files to replace colors according to siteConfig
     if (file.match(/\.css$/)) {
@@ -361,16 +361,16 @@ async function execute() {
 
       Object.keys(siteConfig.colors).forEach(key => {
         const color = siteConfig.colors[key];
-        cssContent = cssContent.replace(new RegExp('\\$' + key, 'g'), color);
+        cssContent = cssContent.replace(new RegExp(`\\$${key}`, 'g'), color);
       });
 
       if (siteConfig.fonts) {
         Object.keys(siteConfig.fonts).forEach(key => {
           const fontString = siteConfig.fonts[key]
-            .map(font => '"' + font + '"')
+            .map(font => `"${font}"`)
             .join(', ');
           cssContent = cssContent.replace(
-            new RegExp('\\$' + key, 'g'),
+            new RegExp(`\\$${key}`, 'g'),
             fontString
           );
         });
@@ -394,20 +394,20 @@ async function execute() {
     if (normalizedFile.match(/\.css$/) && !isSeparateCss(normalizedFile)) {
       const mainCss = join(buildDir, 'css', 'main.css');
       let cssContent = fs.readFileSync(normalizedFile, 'utf8');
-      cssContent = fs.readFileSync(mainCss, 'utf8') + '\n' + cssContent;
+      cssContent = `${fs.readFileSync(mainCss, 'utf8')}\n${cssContent}`;
 
       Object.keys(siteConfig.colors).forEach(key => {
         const color = siteConfig.colors[key];
-        cssContent = cssContent.replace(new RegExp('\\$' + key, 'g'), color);
+        cssContent = cssContent.replace(new RegExp(`\\$${key}`, 'g'), color);
       });
 
       if (siteConfig.fonts) {
         Object.keys(siteConfig.fonts).forEach(key => {
           const fontString = siteConfig.fonts[key]
-            .map(font => '"' + font + '"')
+            .map(font => `"${font}"`)
             .join(', ');
           cssContent = cssContent.replace(
-            new RegExp('\\$' + key, 'g'),
+            new RegExp(`\\$${key}`, 'g'),
             fontString
           );
         });
@@ -418,7 +418,7 @@ async function execute() {
       normalizedFile.match(/\.png$|.jpg$|.svg$|.gif$/) &&
       !commander.skipImageCompression
     ) {
-      const parts = normalizedFile.split(sep + 'static' + sep);
+      const parts = normalizedFile.split(`${sep}static${sep}`);
       const targetDirectory = join(
         buildDir,
         parts[1].substring(0, parts[1].lastIndexOf(sep))
@@ -435,7 +435,7 @@ async function execute() {
         ],
       });
     } else if (!fs.lstatSync(normalizedFile).isDirectory()) {
-      const parts = normalizedFile.split(sep + 'static' + sep);
+      const parts = normalizedFile.split(`${sep}static${sep}`);
       const targetFile = join(buildDir, parts[1]);
       mkdirp.sync(path.dirname(targetFile));
       fs.copySync(normalizedFile, targetFile);
@@ -463,7 +463,7 @@ async function execute() {
       let tempFile = join(__dirname, '..', 'pages', parts[1]);
       tempFile = tempFile.replace(
         path.basename(normalizedFile),
-        'temp' + path.basename(normalizedFile)
+        `temp${path.basename(normalizedFile)}`
       );
       mkdirp.sync(path.dirname(tempFile));
       fs.copySync(normalizedFile, tempFile);
@@ -474,9 +474,9 @@ async function execute() {
       targetFile = targetFile.replace(/\.js$/, '.html');
 
       const regexLang = new RegExp(
-        escapeStringRegexp(sep + 'pages' + sep) +
-          '(.*)' +
-          escapeStringRegexp(sep)
+        `${escapeStringRegexp(`${sep}pages${sep}`)}(.*)${escapeStringRegexp(
+          sep
+        )}`
       );
       const match = regexLang.exec(normalizedFile);
       const langParts = match[1].split(sep);
@@ -488,7 +488,7 @@ async function execute() {
           if (
             language === 'en' ||
             !fs.existsSync(
-              normalizedFile.replace(sep + 'en' + sep, sep + language + sep)
+              normalizedFile.replace(`${sep}en${sep}`, sep + language + sep)
             )
           ) {
             translate.setLanguage(language);
@@ -504,7 +504,7 @@ async function execute() {
             );
             writeFileAndCreateFolder(
               // TODO: use path functions
-              targetFile.replace(sep + 'en' + sep, sep + language + sep),
+              targetFile.replace(`${sep}en${sep}`, sep + language + sep),
               str
             );
           }
@@ -524,7 +524,7 @@ async function execute() {
           </Site>
         );
         writeFileAndCreateFolder(
-          targetFile.replace(sep + 'en' + sep, sep),
+          targetFile.replace(`${sep}en${sep}`, sep),
           str
         );
       } else {
@@ -542,7 +542,7 @@ async function execute() {
           </Site>
         );
         writeFileAndCreateFolder(
-          targetFile.replace(sep + 'en' + sep, sep),
+          targetFile.replace(`${sep}en${sep}`, sep),
           str
         );
       }
diff --git a/lib/server/readCategories.js b/lib/server/readCategories.js
index ecabed649ca5..21c22427c5bb 100644
--- a/lib/server/readCategories.js
+++ b/lib/server/readCategories.js
@@ -11,8 +11,8 @@ const Metadata = require('../core/metadata.js');
 
 const CWD = process.cwd();
 let languages;
-if (fs.existsSync(CWD + '/languages.js')) {
-  languages = require(CWD + '/languages.js');
+if (fs.existsSync(`${CWD}/languages.js`)) {
+  languages = require(`${CWD}/languages.js`);
 } else {
   languages = [
     {
diff --git a/lib/server/readMetadata.js b/lib/server/readMetadata.js
index 2ce18f2c9046..b039ec522727 100644
--- a/lib/server/readMetadata.js
+++ b/lib/server/readMetadata.js
@@ -15,7 +15,7 @@ const metadataUtils = require('./metadataUtils');
 
 const env = require('./env.js');
 
-const siteConfig = require(CWD + '/siteConfig.js');
+const siteConfig = require(`${CWD}/siteConfig.js`);
 const versionFallback = require('./versionFallback.js');
 const utils = require('./utils.js');
 
@@ -44,8 +44,8 @@ function getDocsPath() {
 // returns map from id to object containing sidebar ordering info
 function readSidebar() {
   let allSidebars;
-  if (fs.existsSync(CWD + '/sidebars.json')) {
-    allSidebars = require(CWD + '/sidebars.json');
+  if (fs.existsSync(`${CWD}/sidebars.json`)) {
+    allSidebars = require(`${CWD}/sidebars.json`);
   } else {
     allSidebars = {};
   }
@@ -124,18 +124,18 @@ function processMetadata(file, refDir) {
   }
 
   const langPart =
-    env.translation.enabled || siteConfig.useEnglishUrl ? language + '/' : '';
+    env.translation.enabled || siteConfig.useEnglishUrl ? `${language}/` : '';
   let versionPart = '';
   if (env.versioning.enabled) {
     metadata.version = 'next';
     versionPart = 'next/';
   }
 
-  metadata.permalink = 'docs/' + langPart + versionPart + metadata.id + '.html';
+  metadata.permalink = `docs/${langPart}${versionPart}${metadata.id}.html`;
 
   // change ids previous, next
   metadata.localized_id = metadata.id;
-  metadata.id = (env.translation.enabled ? language + '-' : '') + metadata.id;
+  metadata.id = (env.translation.enabled ? `${language}-` : '') + metadata.id;
   metadata.language = env.translation.enabled ? language : 'en';
 
   const order = readSidebar();
@@ -148,12 +148,12 @@ function processMetadata(file, refDir) {
     if (order[id].next) {
       metadata.next_id = order[id].next;
       metadata.next =
-        (env.translation.enabled ? language + '-' : '') + order[id].next;
+        (env.translation.enabled ? `${language}-` : '') + order[id].next;
     }
     if (order[id].previous) {
       metadata.previous_id = order[id].previous;
       metadata.previous =
-        (env.translation.enabled ? language + '-' : '') + order[id].previous;
+        (env.translation.enabled ? `${language}-` : '') + order[id].previous;
     }
   }
 
@@ -179,7 +179,7 @@ function generateMetadataDocs() {
 
   // metadata for english files
   const docsDir = path.join(CWD, '../', getDocsPath());
-  let files = glob.sync(CWD + '/../' + getDocsPath() + '/**');
+  let files = glob.sync(`${CWD}/../${getDocsPath()}/**`);
   files.forEach(file => {
     const extension = path.extname(file);
 
@@ -200,19 +200,19 @@ function generateMetadataDocs() {
           const baseMetadata = Object.assign({}, metadata);
           baseMetadata.id = baseMetadata.id
             .toString()
-            .replace(/^en-/, currentLanguage + '-');
+            .replace(/^en-/, `${currentLanguage}-`);
           if (baseMetadata.permalink)
             baseMetadata.permalink = baseMetadata.permalink
               .toString()
-              .replace(/^docs\/en\//, 'docs/' + currentLanguage + '/');
+              .replace(/^docs\/en\//, `docs/${currentLanguage}/`);
           if (baseMetadata.next)
             baseMetadata.next = baseMetadata.next
               .toString()
-              .replace(/^en-/, currentLanguage + '-');
+              .replace(/^en-/, `${currentLanguage}-`);
           if (baseMetadata.previous)
             baseMetadata.previous = baseMetadata.previous
               .toString()
-              .replace(/^en-/, currentLanguage + '-');
+              .replace(/^en-/, `${currentLanguage}-`);
           baseMetadata.language = currentLanguage;
           defaultMetadatas[baseMetadata.id] = baseMetadata;
         });
@@ -222,7 +222,7 @@ function generateMetadataDocs() {
 
   // metadata for non-english docs
   const translatedDir = path.join(CWD, 'translated_docs');
-  files = glob.sync(CWD + '/translated_docs/**');
+  files = glob.sync(`${CWD}/translated_docs/**`);
   files.forEach(file => {
     if (!utils.getLanguage(file, translatedDir)) {
       return;
@@ -249,20 +249,20 @@ function generateMetadataDocs() {
       metadata.category = order[id].category;
       if (order[id].next) {
         metadata.next_id = order[id].next.replace(
-          'version-' + metadata.version + '-',
+          `version-${metadata.version}-`,
           ''
         );
         metadata.next =
-          (env.translation.enabled ? metadata.language + '-' : '') +
+          (env.translation.enabled ? `${metadata.language}-` : '') +
           order[id].next;
       }
       if (order[id].previous) {
         metadata.previous_id = order[id].previous.replace(
-          'version-' + metadata.version + '-',
+          `version-${metadata.version}-`,
           ''
         );
         metadata.previous =
-          (env.translation.enabled ? metadata.language + '-' : '') +
+          (env.translation.enabled ? `${metadata.language}-` : '') +
           order[id].previous;
       }
     }
@@ -271,7 +271,7 @@ function generateMetadataDocs() {
 
   // Get the titles of the previous and next ids so that we can use them in
   // navigation buttons in DocsLayout.js
-  Object.keys(metadatas).forEach(function(metadata) {
+  Object.keys(metadatas).forEach(metadata => {
     if (metadatas[metadata].previous) {
       if (metadatas[metadatas[metadata].previous]) {
         metadatas[metadata].previous_title =
@@ -292,13 +292,11 @@ function generateMetadataDocs() {
 
   fs.writeFileSync(
     path.join(__dirname, '/../core/metadata.js'),
-    '/**\n' +
+    `${'/**\n' +
     ' * @' +
     'generated\n' + // separate this out for Nuclide treating @generated as readonly
       ' */\n' +
-      'module.exports = ' +
-      JSON.stringify(metadatas, null, 2) +
-      ';\n'
+      'module.exports = '}${JSON.stringify(metadatas, null, 2)};\n`
   );
 }
 
@@ -306,7 +304,7 @@ function generateMetadataDocs() {
 function generateMetadataBlog() {
   const metadatas = [];
 
-  const files = glob.sync(CWD + '/blog/**/*.*');
+  const files = glob.sync(`${CWD}/blog/**/*.*`);
   files
     .sort()
     .reverse()
@@ -342,12 +340,9 @@ function generateMetadataBlog() {
         .toString()
         .split('-');
       metadata.date = new Date(
-        filePathDateArr[0] +
-          '-' +
-          filePathDateArr[1] +
-          '-' +
-          filePathDateArr[2] +
-          'T06:00:00.000Z'
+        `${filePathDateArr[0]}-${filePathDateArr[1]}-${
+          filePathDateArr[2]
+        }T06:00:00.000Z`
       );
       // allow easier sorting of blog by providing seconds since epoch
       metadata.seconds = Math.round(metadata.date.getTime() / 1000);
@@ -361,13 +356,11 @@ function generateMetadataBlog() {
 
   fs.writeFileSync(
     path.join(__dirname, '/../core/MetadataBlog.js'),
-    '/**\n' +
+    `${'/**\n' +
     ' * @' +
     'generated\n' + // separate this out for Nuclide treating @generated as readonly
       ' */\n' +
-      'module.exports = ' +
-      JSON.stringify(sortedMetadatas, null, 2) +
-      ';\n'
+      'module.exports = '}${JSON.stringify(sortedMetadatas, null, 2)};\n`
   );
 }
 
diff --git a/lib/server/renderUtils.js b/lib/server/renderUtils.js
index 29dc9873b918..70571e4dbf0e 100644
--- a/lib/server/renderUtils.js
+++ b/lib/server/renderUtils.js
@@ -13,7 +13,7 @@ const renderToStaticMarkup = require('react-dom/server').renderToStaticMarkup;
  * rendering within Docusaurus should use this function instead.
  */
 function renderToStaticMarkupWithDoctype(...args) {
-  return '<!DOCTYPE html>' + renderToStaticMarkup(...args);
+  return `<!DOCTYPE html>${renderToStaticMarkup(...args)}`;
 }
 
 module.exports = {
diff --git a/lib/server/server.js b/lib/server/server.js
index 57a7c1a3a774..4deb5b729106 100644
--- a/lib/server/server.js
+++ b/lib/server/server.js
@@ -49,7 +49,7 @@ function execute(port, options) {
 
   function removeModulePathFromCache(moduleName) {
     /* eslint-disable no-underscore-dangle */
-    Object.keys(module.constructor._pathCache).forEach(function(cacheKey) {
+    Object.keys(module.constructor._pathCache).forEach(cacheKey => {
       if (cacheKey.indexOf(moduleName) > 0) {
         delete module.constructor._pathCache[cacheKey];
       }
@@ -149,7 +149,7 @@ function execute(port, options) {
     // Start LiveReload server.
     process.env.NODE_ENV = 'development';
     const server = tinylr();
-    server.listen(constants.LIVE_RELOAD_PORT, function() {
+    server.listen(constants.LIVE_RELOAD_PORT, () => {
       console.log(
         'LiveReload server started on port %d',
         constants.LIVE_RELOAD_PORT
@@ -159,13 +159,13 @@ function execute(port, options) {
     // gaze watches some specified dirs and triggers a callback when they change.
     gaze(
       [
-        '../' + readMetadata.getDocsPath() + '/**/*', // docs
+        `../${readMetadata.getDocsPath()}/**/*`, // docs
         '**/*', // website
         '!node_modules/**/*', // node_modules
       ],
       function() {
         // Listen for all kinds of file changes - modified/added/deleted.
-        this.on('all', function() {
+        this.on('all', () => {
           // Notify LiveReload clients that there's a change.
           // Typically, LiveReload will only refresh the changed paths,
           // so we use / here to force a full-page reload.
@@ -252,29 +252,29 @@ function execute(port, options) {
     Object.keys(mdToHtml).forEach(key => {
       let link = mdToHtml[key];
       link = utils.getPath(link, siteConfig.cleanUrl);
-      link = link.replace('/en/', '/' + language + '/');
+      link = link.replace('/en/', `/${language}/`);
       link = link.replace(
         '/VERSION/',
         metadata.version && metadata.version !== defaultVersion
-          ? '/' + metadata.version + '/'
+          ? `/${metadata.version}/`
           : '/'
       );
       // replace relative links without "./"
       rawContent = rawContent.replace(
-        new RegExp('\\]\\(' + key, 'g'),
-        '](' + link
+        new RegExp(`\\]\\(${key}`, 'g'),
+        `](${link}`
       );
       // replace relative links with "./"
       rawContent = rawContent.replace(
-        new RegExp('\\]\\(\\./' + key, 'g'),
-        '](' + link
+        new RegExp(`\\]\\(\\./${key}`, 'g'),
+        `](${link}`
       );
     });
 
     // replace any relative links to static assets to absolute links
     rawContent = rawContent.replace(
       /\]\(assets\//g,
-      '](' + siteConfig.baseUrl + 'docs/assets/'
+      `](${siteConfig.baseUrl}docs/assets/`
     );
 
     removeModuleAndChildrenFromCache('../core/DocsLayout.js');
@@ -357,7 +357,7 @@ function execute(port, options) {
       );
       const str = renderToStaticMarkupWithDoctype(blogPageComp);
 
-      const pagePath = (page > 0 ? 'page' + (page + 1) : '') + '/index.html';
+      const pagePath = `${page > 0 ? `page${page + 1}` : ''}/index.html`;
       blogPages[pagePath] = str;
     }
 
@@ -369,9 +369,9 @@ function execute(port, options) {
       res.send(blogPages[parts[1]]);
     } else if (parts[1].match(/page([0-9]+)/)) {
       if (parts[1].endsWith('/')) {
-        res.send(blogPages[parts[1] + 'index.html']);
+        res.send(blogPages[`${parts[1]}index.html`]);
       } else {
-        res.send(blogPages[parts[1] + '/index.html']);
+        res.send(blogPages[`${parts[1]}/index.html`]);
       }
     } else {
       // send corresponding blog post. Ex: request to "blog/test/index.html" or
@@ -396,7 +396,7 @@ function execute(port, options) {
       let rawContent = result.rawContent;
       rawContent = rawContent.replace(
         /\]\(assets\//g,
-        '](' + siteConfig.baseUrl + 'blog/assets/'
+        `](${siteConfig.baseUrl}blog/assets/`
       );
       const metadata = Object.assign(
         {path: req.path.toString().split('blog/')[1], content: rawContent},
@@ -478,7 +478,7 @@ function execute(port, options) {
     }
     let englishFile = join(CWD, 'pages', file);
     if (language && language !== 'en') {
-      englishFile = englishFile.replace(sep + language + sep, sep + 'en' + sep);
+      englishFile = englishFile.replace(sep + language + sep, `${sep}en${sep}`);
     }
 
     // check for: a file for the page, an english file for page with unspecified language, or an
@@ -488,17 +488,17 @@ function execute(port, options) {
       fs.existsSync(
         (userFile = userFile.replace(
           path.basename(userFile),
-          'en' + sep + path.basename(userFile)
+          `en${sep}${path.basename(userFile)}`
         ))
       ) ||
       fs.existsSync((userFile = englishFile))
     ) {
       // copy into docusaurus so require paths work
-      const userFileParts = userFile.split('pages' + sep);
+      const userFileParts = userFile.split(`pages${sep}`);
       let tempFile = join(__dirname, '..', 'pages', userFileParts[1]);
       tempFile = tempFile.replace(
         path.basename(file),
-        'temp' + path.basename(file)
+        `temp${path.basename(file)}`
       );
       mkdirp.sync(path.dirname(tempFile));
       fs.copySync(userFile, tempFile);
@@ -544,8 +544,9 @@ function execute(port, options) {
       if (isSeparateCss(file)) {
         return;
       }
-      cssContent =
-        cssContent + '\n' + fs.readFileSync(file, {encoding: 'utf8'});
+      cssContent = `${cssContent}\n${fs.readFileSync(file, {
+        encoding: 'utf8',
+      })}`;
     });
 
     if (
@@ -562,16 +563,16 @@ function execute(port, options) {
 
     Object.keys(siteConfig.colors).forEach(key => {
       const color = siteConfig.colors[key];
-      cssContent = cssContent.replace(new RegExp('\\$' + key, 'g'), color);
+      cssContent = cssContent.replace(new RegExp(`\\$${key}`, 'g'), color);
     });
 
     if (siteConfig.fonts) {
       Object.keys(siteConfig.fonts).forEach(key => {
         const fontString = siteConfig.fonts[key]
-          .map(font => '"' + font + '"')
+          .map(font => `"${font}"`)
           .join(', ');
         cssContent = cssContent.replace(
-          new RegExp('\\$' + key, 'g'),
+          new RegExp(`\\$${key}`, 'g'),
           fontString
         );
       });
@@ -597,11 +598,11 @@ function execute(port, options) {
   // for example, request to "blog" returns "blog/index.html" or "blog.html"
   app.get(noExtRouting(), (req, res, next) => {
     const slash = req.path.toString().endsWith('/') ? '' : '/';
-    const requestUrl = 'http://localhost:' + port + req.path;
-    requestFile(requestUrl + slash + 'index.html', res, () => {
+    const requestUrl = `http://localhost:${port}${req.path}`;
+    requestFile(`${requestUrl + slash}index.html`, res, () => {
       requestFile(
         slash === '/'
-          ? requestUrl + '.html'
+          ? `${requestUrl}.html`
           : requestUrl.replace(/\/$/, '.html'),
         res,
         next
@@ -616,7 +617,7 @@ function execute(port, options) {
       next();
       return;
     }
-    requestFile('http://localhost:' + port + req.path + '.html', res, next);
+    requestFile(`http://localhost:${port}${req.path}.html`, res, next);
   });
 
   if (options.watch) startLiveReload();
diff --git a/lib/server/sitemap.js b/lib/server/sitemap.js
index 5f0440546ef2..fb0d891ad486 100644
--- a/lib/server/sitemap.js
+++ b/lib/server/sitemap.js
@@ -14,7 +14,7 @@ const CWD = process.cwd();
 const sitemap = require('sitemap');
 const utils = require('../core/utils');
 
-const siteConfig = require(CWD + '/siteConfig.js');
+const siteConfig = require(`${CWD}/siteConfig.js`);
 
 const readMetadata = require('./readMetadata.js');
 
@@ -27,7 +27,7 @@ const MetadataBlog = require('../core/MetadataBlog.js');
 module.exports = function(callback) {
   console.log('sitemap.js triggered...');
 
-  const files = glob.sync(CWD + '/pages/en/**/*.js');
+  const files = glob.sync(`${CWD}/pages/en/**/*.js`);
 
   // English-only is the default.
   let enabledLanguages = [
@@ -39,8 +39,8 @@ module.exports = function(callback) {
   ];
 
   // If we have a languages.js file, get all the enabled languages in there
-  if (fs.existsSync(CWD + '/languages.js')) {
-    const languages = require(CWD + '/languages.js');
+  if (fs.existsSync(`${CWD}/languages.js`)) {
+    const languages = require(`${CWD}/languages.js`);
     enabledLanguages = languages.filter(lang => lang.enabled);
   }
 
@@ -59,7 +59,7 @@ module.exports = function(callback) {
 
   MetadataBlog.forEach(blog => {
     urls.push({
-      url: '/blog/' + utils.getPath(blog.path, siteConfig.cleanUrl),
+      url: `/blog/${utils.getPath(blog.path, siteConfig.cleanUrl)}`,
       changefreq: 'weekly',
       priority: 0.3,
     });
diff --git a/lib/server/translate-plugin.js b/lib/server/translate-plugin.js
index 4cf1fcd157a3..6b642d4418b3 100644
--- a/lib/server/translate-plugin.js
+++ b/lib/server/translate-plugin.js
@@ -30,14 +30,14 @@ module.exports = function translatePlugin(babel) {
           path.replaceWith(
             t.jSXExpressionContainer(
               t.callExpression(t.identifier('translate'), [
-                t.stringLiteral(text + '|' + description),
+                t.stringLiteral(`${text}|${description}`),
               ])
             )
           );
         } else {
           path.replaceWith(
             t.callExpression(t.identifier('translate'), [
-              t.stringLiteral(text + '|' + description),
+              t.stringLiteral(`${text}|${description}`),
             ])
           );
         }
diff --git a/lib/server/translate.js b/lib/server/translate.js
index c1cb91582342..68d929e8dc23 100644
--- a/lib/server/translate.js
+++ b/lib/server/translate.js
@@ -47,19 +47,13 @@ function translate(str) {
     // if a translated string doesn't exist, but english does then fallback
     if (doesTranslationExist(str, 'en')) {
       console.error(
-        "Could not find a string translation in '" +
-          language +
-          "' for string '" +
-          str +
-          "'. Using English version instead."
+        `Could not find a string translation in '${language}' for string '${str}'. Using English version instead.`
       );
 
       return parseEscapeSequences(translation.en['pages-strings'][str]);
     }
     throw new Error(
-      "Text that you've identified for translation ('" +
-        str +
-        "') hasn't been added to the global list in 'en.json'. To solve this problem run 'yarn write-translations'."
+      `Text that you've identified for translation ('${str}') hasn't been added to the global list in 'en.json'. To solve this problem run 'yarn write-translations'.`
     );
   }
   return parseEscapeSequences(translation[language]['pages-strings'][str]);
diff --git a/lib/server/translation.js b/lib/server/translation.js
index d43033019e54..885df363ae5f 100644
--- a/lib/server/translation.js
+++ b/lib/server/translation.js
@@ -13,8 +13,8 @@ const glob = require('glob');
 const path = require('path');
 
 let languages;
-if (fs.existsSync(CWD + '/languages.js')) {
-  languages = require(CWD + '/languages.js');
+if (fs.existsSync(`${CWD}/languages.js`)) {
+  languages = require(`${CWD}/languages.js`);
 } else {
   languages = [
     {
@@ -29,7 +29,7 @@ const enabledLanguages = languages.filter(lang => lang.enabled);
 
 const translation = {languages: enabledLanguages};
 
-const files = glob.sync(CWD + '/i18n/**');
+const files = glob.sync(`${CWD}/i18n/**`);
 const langRegex = /\/i18n\/(.*)\.json$/;
 
 files.forEach(file => {
diff --git a/lib/server/utils.js b/lib/server/utils.js
index d4598f8ffc57..c10814d784c8 100644
--- a/lib/server/utils.js
+++ b/lib/server/utils.js
@@ -25,7 +25,7 @@ function getSubDir(file, refDir) {
 //  returns 'ko'
 function getLanguage(file, refDir) {
   const regexSubFolder = new RegExp(
-    '/' + escapeStringRegexp(path.basename(refDir)) + '/(.*)/.*/'
+    `/${escapeStringRegexp(path.basename(refDir))}/(.*)/.*/`
   );
   const match = regexSubFolder.exec(file);
 
diff --git a/lib/server/versionFallback.js b/lib/server/versionFallback.js
index 20a3d46b0f36..bebd034dd196 100644
--- a/lib/server/versionFallback.js
+++ b/lib/server/versionFallback.js
@@ -15,20 +15,20 @@ const metadataUtils = require('./metadataUtils');
 const env = require('./env.js');
 const utils = require('./utils.js');
 
-const siteConfig = require(CWD + '/siteConfig.js');
+const siteConfig = require(`${CWD}/siteConfig.js`);
 
-const ENABLE_TRANSLATION = fs.existsSync(CWD + '/languages.js');
+const ENABLE_TRANSLATION = fs.existsSync(`${CWD}/languages.js`);
 
 let versions;
-if (fs.existsSync(CWD + '/versions.json')) {
-  versions = require(CWD + '/versions.json');
+if (fs.existsSync(`${CWD}/versions.json`)) {
+  versions = require(`${CWD}/versions.json`);
 } else {
   versions = [];
 }
 
 let languages;
-if (fs.existsSync(CWD + '/languages.js')) {
-  languages = require(CWD + '/languages.js');
+if (fs.existsSync(`${CWD}/languages.js`)) {
+  languages = require(`${CWD}/languages.js`);
 } else {
   languages = [
     {
@@ -39,7 +39,7 @@ if (fs.existsSync(CWD + '/languages.js')) {
   ];
 }
 
-const versionFolder = CWD + '/versioned_docs/';
+const versionFolder = `${CWD}/versioned_docs/`;
 
 // available stores doc ids of documents that are available for
 // each version
@@ -47,7 +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 = {};
-const files = glob.sync(versionFolder + '**');
+const files = glob.sync(`${versionFolder}**`);
 files.forEach(file => {
   const ext = path.extname(file);
   if (ext !== '.md' && ext !== '.markdown') {
@@ -85,7 +85,7 @@ files.forEach(file => {
   // e.g. version-1.0.0-getting-started => 1.0.0
   const version = metadata.id.substring(
     metadata.id.indexOf('version-') + 8, // version- is 8 characters
-    metadata.id.lastIndexOf('-' + metadata.original_id)
+    metadata.id.lastIndexOf(`-${metadata.original_id}`)
   );
   available[metadata.original_id].add(version);
 
@@ -178,26 +178,20 @@ function processVersionMetadata(file, version, useVersion, language) {
   const latestVersion = versions[0];
 
   if (!ENABLE_TRANSLATION && !siteConfig.useEnglishUrl) {
-    metadata.permalink =
-      'docs/' +
-      (version !== latestVersion ? version + '/' : '') +
-      metadata.original_id +
-      '.html';
+    metadata.permalink = `docs/${
+      version !== latestVersion ? `${version}/` : ''
+    }${metadata.original_id}.html`;
   } else {
-    metadata.permalink =
-      'docs/' +
-      language +
-      '/' +
-      (version !== latestVersion ? version + '/' : '') +
-      metadata.original_id +
-      '.html';
+    metadata.permalink = `docs/${language}/${
+      version !== latestVersion ? `${version}/` : ''
+    }${metadata.original_id}.html`;
   }
   metadata.id = metadata.id.replace(
-    'version-' + useVersion + '-',
-    'version-' + version + '-'
+    `version-${useVersion}-`,
+    `version-${version}-`
   );
   metadata.localized_id = metadata.id;
-  metadata.id = (env.translation.enabled ? language + '-' : '') + metadata.id;
+  metadata.id = (env.translation.enabled ? `${language}-` : '') + metadata.id;
   metadata.language = language;
   metadata.version = version;
 
@@ -252,7 +246,7 @@ function sidebarVersion(reqVersion) {
     if (
       requestedFound &&
       fs.existsSync(
-        CWD + '/versioned_sidebars/version-' + versions[i] + '-sidebars.json'
+        `${CWD}/versioned_sidebars/version-${versions[i]}-sidebars.json`
       )
     ) {
       return versions[i];
@@ -272,12 +266,11 @@ function diffLatestSidebar() {
   const latest = versions[0];
 
   const version = sidebarVersion(latest);
-  const latestSidebar =
-    CWD + '/versioned_sidebars/version-' + version + '-sidebars.json';
+  const latestSidebar = `${CWD}/versioned_sidebars/version-${version}-sidebars.json`;
   if (!fs.existsSync(latestSidebar)) {
     return true;
   }
-  const currentSidebar = CWD + '/sidebars.json';
+  const currentSidebar = `${CWD}/sidebars.json`;
   // if no current sidebar file, return false so no sidebar file gets copied
   if (!fs.existsSync(currentSidebar)) {
     return false;
@@ -287,7 +280,7 @@ function diffLatestSidebar() {
   // stripped and current sidebar
   return (
     JSON.stringify(JSON.parse(fs.readFileSync(latestSidebar, 'utf8'))).replace(
-      new RegExp('version-' + version + '-', 'g'),
+      new RegExp(`version-${version}-`, 'g'),
       ''
     ) !== JSON.stringify(JSON.parse(fs.readFileSync(currentSidebar, 'utf8')))
   );
@@ -302,12 +295,12 @@ function sidebarData() {
     const sidebar = JSON.parse(
       fs
         .readFileSync(
-          CWD + '/versioned_sidebars/version-' + version + '-sidebars.json',
+          `${CWD}/versioned_sidebars/version-${version}-sidebars.json`,
           'utf8'
         )
         .replace(
-          new RegExp('version-' + version + '-', 'g'),
-          'version-' + versions[i] + '-'
+          new RegExp(`version-${version}-`, 'g'),
+          `version-${versions[i]}-`
         )
     );
     Object.assign(allSidebars, sidebar);
diff --git a/lib/start-server.js b/lib/start-server.js
index cf940ec15fbd..e5df4351134c 100755
--- a/lib/start-server.js
+++ b/lib/start-server.js
@@ -9,7 +9,7 @@
 
 require('babel-register')({
   babelrc: false,
-  only: [__dirname, process.cwd() + '/core'],
+  only: [__dirname, `${process.cwd()}/core`],
   plugins: [
     require('./server/translate-plugin.js'),
     'transform-class-properties',
@@ -27,7 +27,7 @@ const tcpPortUsed = require('tcp-port-used');
 const CWD = process.cwd();
 const env = require('./server/env.js');
 
-if (!fs.existsSync(CWD + '/siteConfig.js')) {
+if (!fs.existsSync(`${CWD}/siteConfig.js`)) {
   console.error(
     chalk.red('Error: No siteConfig.js file found in website folder!')
   );
@@ -51,7 +51,7 @@ const MAX_ATTEMPTS = 10;
 function checkPort() {
   tcpPortUsed
     .check(port, 'localhost')
-    .then(function(inUse) {
+    .then(inUse => {
       if (inUse && numAttempts >= MAX_ATTEMPTS) {
         console.log(
           'Reached max attempts, exiting. Please open up some ports or ' +
@@ -59,7 +59,7 @@ function checkPort() {
         );
         process.exit(1);
       } else if (inUse) {
-        console.error(chalk.red('Port ' + port + ' is in use'));
+        console.error(chalk.red(`Port ${port} is in use`));
         // Try again but with port + 1
         port += 1;
         numAttempts += 1;
@@ -68,14 +68,14 @@ function checkPort() {
         // start local server on specified port
         const server = require('./server/server.js');
         server(port, program.opts());
-        const {baseUrl} = require(CWD + '/siteConfig.js');
+        const {baseUrl} = require(`${CWD}/siteConfig.js`);
         const host = `http://localhost:${port}${baseUrl}`;
         console.log('Docusaurus server started on port %d', port);
         openBrowser(host);
       }
     })
-    .catch(function(ex) {
-      setTimeout(function() {
+    .catch(ex => {
+      setTimeout(() => {
         throw ex;
       }, 0);
     });
diff --git a/lib/version.js b/lib/version.js
index 18d31219ede0..9c4e23e314c3 100755
--- a/lib/version.js
+++ b/lib/version.js
@@ -22,8 +22,8 @@ const env = require('./server/env.js');
 
 const CWD = process.cwd();
 let versions;
-if (fs.existsSync(CWD + '/versions.json')) {
-  versions = require(CWD + '/versions.json');
+if (fs.existsSync(`${CWD}/versions.json`)) {
+  versions = require(`${CWD}/versions.json`);
 } else {
   versions = [];
 }
@@ -63,7 +63,7 @@ if (versions.includes(version)) {
 function makeHeader(metadata) {
   let header = '---\n';
   Object.keys(metadata).forEach(key => {
-    header += key + ': ' + metadata[key] + '\n';
+    header += `${key}: ${metadata[key]}\n`;
   });
   header += '---\n';
   return header;
@@ -75,12 +75,12 @@ function writeFileAndCreateFolder(file, content, encoding) {
   fs.writeFileSync(file, content, encoding);
 }
 
-const versionFolder = CWD + '/versioned_docs/version-' + version;
+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
-const 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') {
@@ -109,7 +109,7 @@ files.forEach(file => {
   }
 
   metadata.original_id = metadata.id;
-  metadata.id = 'version-' + version + '-' + metadata.id;
+  metadata.id = `version-${version}-${metadata.id}`;
 
   const docsDir = path.join(CWD, '../', readMetadata.getDocsPath());
   const subDir = utils.getSubDir(file, docsDir);
@@ -126,12 +126,12 @@ files.forEach(file => {
 
 // copy sidebar if necessary
 if (versionFallback.diffLatestSidebar()) {
-  mkdirp(CWD + '/versioned_sidebars');
-  const sidebar = JSON.parse(fs.readFileSync(CWD + '/sidebars.json', 'utf8'));
+  mkdirp(`${CWD}/versioned_sidebars`);
+  const sidebar = JSON.parse(fs.readFileSync(`${CWD}/sidebars.json`, 'utf8'));
   const versioned = {};
 
   Object.keys(sidebar).forEach(sb => {
-    const versionSidebar = 'version-' + version + '-' + sb;
+    const versionSidebar = `version-${version}-${sb}`;
     versioned[versionSidebar] = {};
 
     const categories = sidebar[sb];
@@ -140,16 +140,14 @@ if (versionFallback.diffLatestSidebar()) {
 
       const ids = categories[category];
       ids.forEach(id => {
-        versioned[versionSidebar][category].push(
-          'version-' + version + '-' + id
-        );
+        versioned[versionSidebar][category].push(`version-${version}-${id}`);
       });
     });
   });
 
   fs.writeFileSync(
-    CWD + '/versioned_sidebars/version-' + version + '-sidebars.json',
-    JSON.stringify(versioned, null, 2) + '\n',
+    `${CWD}/versioned_sidebars/version-${version}-sidebars.json`,
+    `${JSON.stringify(versioned, null, 2)}\n`,
     'utf8'
   );
 }
@@ -157,8 +155,8 @@ if (versionFallback.diffLatestSidebar()) {
 // update versions.json file
 versions.unshift(version);
 fs.writeFileSync(
-  CWD + '/versions.json',
-  JSON.stringify(versions, null, 2) + '\n'
+  `${CWD}/versions.json`,
+  `${JSON.stringify(versions, null, 2)}\n`
 );
 
-console.log(`${chalk.green('Version ' + version + ' created!\n')}`);
+console.log(`${chalk.green(`Version ${version} created!\n`)}`);
diff --git a/lib/write-translations.js b/lib/write-translations.js
index 47bfb1d7cd97..8db7cc21b13d 100755
--- a/lib/write-translations.js
+++ b/lib/write-translations.js
@@ -29,16 +29,16 @@ 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');
+const siteConfig = require(`${CWD}/siteConfig.js`);
+const sidebars = require(`${CWD}/sidebars.json`);
 
 let customTranslations = {
   'localized-strings': {},
   'pages-strings': {},
 };
-if (fs.existsSync(CWD + '/data/custom-translation-strings.json')) {
+if (fs.existsSync(`${CWD}/data/custom-translation-strings.json`)) {
   customTranslations = JSON.parse(
-    fs.readFileSync(CWD + '/data/custom-translation-strings.json', 'utf8')
+    fs.readFileSync(`${CWD}/data/custom-translation-strings.json`, 'utf8')
   );
 }
 
@@ -59,7 +59,7 @@ function execute() {
 
   // look through markdown headers of docs for titles and categories to translate
   const docsDir = nodePath.join(CWD, '../', readMetadata.getDocsPath());
-  let files = glob.sync(CWD + '/../' + readMetadata.getDocsPath() + '/**');
+  let files = glob.sync(`${CWD}/../${readMetadata.getDocsPath()}/**`);
   files.forEach(file => {
     const extension = nodePath.extname(file);
     if (extension === '.md' || extension === '.markdown') {
@@ -98,7 +98,7 @@ function execute() {
     });
   });
 
-  files = glob.sync(CWD + '/versioned_sidebars/*');
+  files = glob.sync(`${CWD}/versioned_sidebars/*`);
   files.forEach(file => {
     if (!file.endsWith('-sidebars.json')) {
       if (file.endsWith('-sidebar.json')) {
@@ -125,7 +125,7 @@ function execute() {
   });
 
   // go through pages to look for text inside translate tags
-  files = glob.sync(CWD + '/pages/en/**');
+  files = glob.sync(`${CWD}/pages/en/**`);
   files.forEach(file => {
     const extension = nodePath.extname(file);
     if (extension === '.js') {
@@ -148,7 +148,7 @@ function execute() {
                 description = attributes[i].value.value;
               }
             }
-            translations['pages-strings'][text + '|' + description] = text;
+            translations['pages-strings'][`${text}|${description}`] = text;
           }
         },
       });
@@ -177,8 +177,8 @@ function execute() {
     customTranslations['localized-strings']
   );
   writeFileAndCreateFolder(
-    CWD + '/i18n/en.json',
-    JSON.stringify(
+    `${CWD}/i18n/en.json`,
+    `${JSON.stringify(
       Object.assign(
         {
           _comment: 'This file is auto-generated by write-translations.js',
@@ -187,7 +187,7 @@ function execute() {
       ),
       null,
       2
-    ) + '\n'
+    )}\n`
   );
 }
 
diff --git a/package.json b/package.json
index 92d42329cc51..5ae1f738b91b 100644
--- a/package.json
+++ b/package.json
@@ -3,12 +3,7 @@
   "description": "Easy to Maintain Open Source Documentation Websites",
   "version": "1.3.2",
   "license": "MIT",
-  "keywords": [
-    "documentation",
-    "websites",
-    "open source",
-    "docusaurus"
-  ],
+  "keywords": ["documentation", "websites", "open source", "docusaurus"],
   "repository": {
     "type": "git",
     "url": "https://github.com/facebook/Docusaurus.git"
@@ -16,13 +11,22 @@
   "scripts": {
     "ci-check": "yarn lint && yarn prettier:diff",
     "format:source": "prettier --config .prettierrc --write \"lib/**/*.js\"",
-    "format:examples": "prettier --config .prettierrc --write \"examples/**/*.js\"",
-    "lint": "eslint --cache \"lib/**/*.js\" \"examples/**/*.js\" \"website/**/*.js\"",
-    "nit:source": "prettier --config .prettierrc --list-different \"lib/**/*.js\"",
-    "nit:examples": "prettier --config .prettierrc --list-different \"examples/**/*.js\"",
+    "format:examples":
+      "prettier --config .prettierrc --write \"examples/**/*.js\"",
+    "format:website":
+      "prettier --config .prettierrc --write \"website/**/*.js\"",
+    "lint":
+      "eslint --cache \"lib/**/*.js\" \"examples/**/*.js\" \"website/**/*.js\"",
+    "nit:source":
+      "prettier --config .prettierrc --list-different \"lib/**/*.js\"",
+    "nit:examples":
+      "prettier --config .prettierrc --list-different \"examples/**/*.js\"",
+    "nit:website":
+      "prettier --config .prettierrc --list-different \"website/**/*.js\"",
     "precommit": "lint-staged",
-    "prettier": "yarn format:source && yarn format:examples",
-    "prettier:diff": "yarn nit:source && yarn nit:examples",
+    "prettier":
+      "yarn format:source && yarn format:examples && yarn format:website",
+    "prettier:diff": "yarn nit:source && yarn nit:examples && yarn nit:website",
     "test": "jest",
     "start": "cd website && yarn start"
   },
diff --git a/website/data/users.js b/website/data/users.js
index 2be89bae7fff..6ea86e28d74e 100644
--- a/website/data/users.js
+++ b/website/data/users.js
@@ -210,7 +210,7 @@ module.exports = [
     fbOpenSource: false,
     pinned: false,
   },
-    {
+  {
     caption: 'single-spa',
     image: 'https://single-spa.js.org/img/logo-white-bgblue.svg',
     infoLink: 'https://single-spa.js.org/',
diff --git a/website/languages.js b/website/languages.js
index 59a17d380b31..2bb754b1a6a9 100644
--- a/website/languages.js
+++ b/website/languages.js
@@ -8,178 +8,178 @@
 const languages = [
   {
     enabled: true,
-    name: "English",
-    tag: "en"
+    name: 'English',
+    tag: 'en',
   },
   {
     enabled: false,
-    name: "日本語",
-    tag: "ja"
+    name: '日本語',
+    tag: 'ja',
   },
   {
     enabled: false,
-    name: "العربية",
-    tag: "ar"
+    name: 'العربية',
+    tag: 'ar',
   },
   {
     enabled: false,
-    name: "Bosanski",
-    tag: "bs-BA"
+    name: 'Bosanski',
+    tag: 'bs-BA',
   },
   {
     enabled: false,
-    name: "Català",
-    tag: "ca"
+    name: 'Català',
+    tag: 'ca',
   },
   {
     enabled: false,
-    name: "Čeština",
-    tag: "cs"
+    name: 'Čeština',
+    tag: 'cs',
   },
   {
     enabled: false,
-    name: "Dansk",
-    tag: "da"
+    name: 'Dansk',
+    tag: 'da',
   },
   {
     enabled: false,
-    name: "Deutsch",
-    tag: "de"
+    name: 'Deutsch',
+    tag: 'de',
   },
   {
     enabled: false,
-    name: "Ελληνικά",
-    tag: "el"
+    name: 'Ελληνικά',
+    tag: 'el',
   },
   {
     enabled: true,
-    name: "Español",
-    tag: "es-ES"
+    name: 'Español',
+    tag: 'es-ES',
   },
   {
     enabled: false,
-    name: "فارسی",
-    tag: "fa-IR"
+    name: 'فارسی',
+    tag: 'fa-IR',
   },
   {
     enabled: false,
-    name: "Suomi",
-    tag: "fi"
+    name: 'Suomi',
+    tag: 'fi',
   },
   {
     enabled: false,
-    name: "Français",
-    tag: "fr"
+    name: 'Français',
+    tag: 'fr',
   },
   {
     enabled: false,
-    name: "עִברִית",
-    tag: "he"
+    name: 'עִברִית',
+    tag: 'he',
   },
   {
     enabled: false,
-    name: "Magyar",
-    tag: "hu"
+    name: 'Magyar',
+    tag: 'hu',
   },
   {
     enabled: false,
-    name: "Bahasa Indonesia",
-    tag: "id-ID"
+    name: 'Bahasa Indonesia',
+    tag: 'id-ID',
   },
   {
     enabled: false,
-    name: "Italiano",
-    tag: "it"
+    name: 'Italiano',
+    tag: 'it',
   },
   {
     enabled: false,
-    name: "Afrikaans",
-    tag: "af"
+    name: 'Afrikaans',
+    tag: 'af',
   },
   {
     enabled: false,
-    name: "한국어",
-    tag: "ko"
+    name: '한국어',
+    tag: 'ko',
   },
   {
     enabled: false,
-    name: "मराठी",
-    tag: "mr-IN"
+    name: 'मराठी',
+    tag: 'mr-IN',
   },
   {
     enabled: false,
-    name: "Nederlands",
-    tag: "nl"
+    name: 'Nederlands',
+    tag: 'nl',
   },
   {
     enabled: false,
-    name: "Norsk",
-    tag: "no-NO"
+    name: 'Norsk',
+    tag: 'no-NO',
   },
   {
     enabled: false,
-    name: "Polskie",
-    tag: "pl"
+    name: 'Polskie',
+    tag: 'pl',
   },
   {
     enabled: false,
-    name: "Português",
-    tag: "pt-PT"
+    name: 'Português',
+    tag: 'pt-PT',
   },
   {
     enabled: false,
-    name: "Português (Brasil)",
-    tag: "pt-BR"
+    name: 'Português (Brasil)',
+    tag: 'pt-BR',
   },
   {
     enabled: true,
-    name: "Română",
-    tag: "ro"
+    name: 'Română',
+    tag: 'ro',
   },
   {
     enabled: false,
-    name: "Русский",
-    tag: "ru"
+    name: 'Русский',
+    tag: 'ru',
   },
   {
     enabled: false,
-    name: "Slovenský",
-    tag: "sk-SK"
+    name: 'Slovenský',
+    tag: 'sk-SK',
   },
   {
     enabled: false,
-    name: "Српски језик (Ћирилица)",
-    tag: "sr"
+    name: 'Српски језик (Ћирилица)',
+    tag: 'sr',
   },
   {
     enabled: false,
-    name: "Svenska",
-    tag: "sv-SE"
+    name: 'Svenska',
+    tag: 'sv-SE',
   },
   {
     enabled: true,
-    name: "Türkçe",
-    tag: "tr"
+    name: 'Türkçe',
+    tag: 'tr',
   },
   {
     enabled: false,
-    name: "Українська",
-    tag: "uk"
+    name: 'Українська',
+    tag: 'uk',
   },
   {
     enabled: false,
-    name: "Tiếng Việt",
-    tag: "vi"
+    name: 'Tiếng Việt',
+    tag: 'vi',
   },
   {
     enabled: true,
-    name: "简体中文",
-    tag: "zh-CN"
+    name: '简体中文',
+    tag: 'zh-CN',
   },
   {
     enabled: false,
-    name: "繁體中文",
-    tag: "zh-TW"
-  }
+    name: '繁體中文',
+    tag: 'zh-TW',
+  },
 ];
 module.exports = languages;
diff --git a/website/pages/en/about-slash.js b/website/pages/en/about-slash.js
index b6047e6ed386..4ad722134997 100644
--- a/website/pages/en/about-slash.js
+++ b/website/pages/en/about-slash.js
@@ -11,7 +11,7 @@ const React = require('react');
 const CompLibrary = require('../../core/CompLibrary.js');
 
 const Container = CompLibrary.Container;
-const siteConfig = require(process.cwd() + '/siteConfig.js');
+const siteConfig = require(`${process.cwd()}/siteConfig.js`);
 const translate = require('../../server/translate.js').translate;
 
 class AboutSlash extends React.Component {
diff --git a/website/pages/en/help.js b/website/pages/en/help.js
index 9bc40b2289a0..1e80c017e4bd 100755
--- a/website/pages/en/help.js
+++ b/website/pages/en/help.js
@@ -10,7 +10,7 @@ const CompLibrary = require('../../core/CompLibrary.js');
 
 const Container = CompLibrary.Container;
 const GridBlock = CompLibrary.GridBlock;
-const siteConfig = require(process.cwd() + '/siteConfig.js');
+const siteConfig = require(`${process.cwd()}/siteConfig.js`);
 const translate = require('../../server/translate.js').translate;
 
 class Help extends React.Component {
diff --git a/website/pages/en/index.js b/website/pages/en/index.js
index 58b2f3c2d3d5..65519b6a9bf8 100755
--- a/website/pages/en/index.js
+++ b/website/pages/en/index.js
@@ -10,7 +10,7 @@ const CompLibrary = require('../../core/CompLibrary.js');
 
 const Container = CompLibrary.Container;
 const GridBlock = CompLibrary.GridBlock;
-const siteConfig = require(process.cwd() + '/siteConfig.js');
+const siteConfig = require(`${process.cwd()}/siteConfig.js`);
 const translate = require('../../server/translate.js').translate;
 
 class Button extends React.Component {
diff --git a/website/pages/en/users.js b/website/pages/en/users.js
index 67b598609ddd..c0fdc8cc017f 100644
--- a/website/pages/en/users.js
+++ b/website/pages/en/users.js
@@ -9,7 +9,7 @@ const React = require('react');
 const CompLibrary = require('../../core/CompLibrary.js');
 
 const Container = CompLibrary.Container;
-const siteConfig = require(process.cwd() + '/siteConfig.js');
+const siteConfig = require(`${process.cwd()}/siteConfig.js`);
 const translate = require('../../server/translate.js').translate;
 
 class Users extends React.Component {
diff --git a/website/pages/en/versions.js b/website/pages/en/versions.js
index 6cc4d17ccdc2..b2f7d2512001 100644
--- a/website/pages/en/versions.js
+++ b/website/pages/en/versions.js
@@ -13,8 +13,8 @@ const Container = CompLibrary.Container;
 
 const CWD = process.cwd();
 
-const siteConfig = require(CWD + '/siteConfig.js');
-const versions = require(CWD + '/versions.json');
+const siteConfig = require(`${CWD}/siteConfig.js`);
+const versions = require(`${CWD}/versions.json`);
 
 function Versions(props) {
   const latestVersion = versions[0];
diff --git a/website/siteConfig.js b/website/siteConfig.js
index f8d8f20ee72d..cd0e8b769892 100644
--- a/website/siteConfig.js
+++ b/website/siteConfig.js
@@ -37,15 +37,15 @@ const siteConfig = {
     apiKey: '3eb9507824b8be89e7a199ecaa1a9d2c',
     indexName: 'docusaurus',
     algoliaOptions: {
-      facetFilters: [ "lang:LANGUAGE" ]
-    }
+      facetFilters: ['lang:LANGUAGE'],
+    },
   },
   colors: {
     primaryColor: '#2E8555',
     secondaryColor: '#205C3B',
   },
   translationRecruitingLink: 'https://crowdin.com/project/docusaurus',
-  copyright: 'Copyright © ' + new Date().getFullYear() + ' Facebook Inc.',
+  copyright: `Copyright © ${new Date().getFullYear()} Facebook Inc.`,
   usePrism: ['jsx'],
   highlight: {
     theme: 'atom-one-dark',
diff --git a/website/static/js/code-blocks-buttons.js b/website/static/js/code-blocks-buttons.js
index a9435d83f3c6..0606b056ac85 100644
--- a/website/static/js/code-blocks-buttons.js
+++ b/website/static/js/code-blocks-buttons.js
@@ -1,5 +1,5 @@
-/* global ClipboardJS */
-
+// Turn off ESLint for this file because it's sent down to users as-is.
+/* eslint-disable */
 window.addEventListener('load', function() {
   function button(label, ariaLabel, icon, className) {
     const btn = document.createElement('button');
@@ -31,8 +31,6 @@ 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');
     },