diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000000..5110fc1096
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,56 @@
+module.exports = {
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    ecmaFeatures: {
+      jsx: true
+    }
+    // project: './tsconfig.json'
+  },
+  extends: [
+    "airbnb",
+    "plugin:react/recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier/@typescript-eslint",
+    "prettier/react",
+    "plugin:prettier/recommended"
+  ],
+  settings: {
+    react: {
+      version: "detect"
+    },
+    "import/resolver": {
+      typescript: {}
+    }
+  },
+  env: {
+    browser: true,
+    node: true,
+    jest: true
+  },
+  rules: {
+    "react/jsx-filename-extension": "off",
+    "react-hooks/rules-of-hooks": "error",
+    "react-hooks/exhaustive-deps": "warn",
+    "import/prefer-default-export": "off",
+    "import/extensions": "off",
+    "consistent-return": "off",
+    // "camelcase": "off",
+    // "@typescript-eslint/camelcase": ["error", { "properties": "never" }],
+    // "no-unused-vars": "off",
+    // "@typescript-eslint/no-unused-vars": "error",
+    // "@typescript-eslint/indent": ["error", 2]
+  },
+  plugins: [
+    "@typescript-eslint",
+    "react-hooks"
+    // "prettier"
+  ],
+  overrides: [
+    {
+      files: ["**/*.js"],
+      rules: {
+        "@typescript-eslint/no-var-requires": "off"
+      }
+    }
+  ]
+};
diff --git a/.gitignore b/.gitignore
index 9de55a7b46..4613a28ff3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@ package-lock.json
 # Build directory
 /public
 .DS_Store
+build
 
 .env
 .firebase/*
diff --git a/.prettierrc b/.prettierrc
index 5159a26f3b..5c1a497dcc 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1,12 +1,12 @@
 {
-  "printWidth": 80,
-  "tabWidth": 2,
-  "useTabs": false,
-  "semi": true,
-  "singleQuote": true,
-  "jsxSingleQuote": false,
-  "trailingComma": "es5",
-  "bracketSpacing": true,
-  "jsxBracketSameLine": false,
-  "arrowParens": "avoid"
+printWidth: 80,
+tabWidth: 2,
+useTabs: false,
+semi: true,
+singleQuote: true,
+jsxSingleQuote: false,
+trailingComma: "es5",
+bracketSpacing: true,
+jsxBracketSameLine: false,
+arrowParens: "avoid"
 }
diff --git a/gatsby-config.js b/gatsby-config.js
index ba837c76f5..00dc4a4f35 100644
--- a/gatsby-config.js
+++ b/gatsby-config.js
@@ -1,4 +1,5 @@
 if (process.env.ENVIROMENT !== 'production') {
+  // eslint-disable-next-line global-require
   require('dotenv').config();
 }
 
@@ -17,50 +18,54 @@ module.exports = {
     'gatsby-plugin-catch-links',
     'gatsby-plugin-react-helmet',
     {
-      resolve: `gatsby-plugin-canonical-urls`,
+      resolve: 'gatsby-plugin-canonical-urls',
       options: {
         siteUrl: config.siteUrl,
       },
     },
-    `gatsby-plugin-sharp`,
+    'gatsby-plugin-sharp',
     {
-      resolve: `gatsby-source-filesystem`,
+      resolve: 'gatsby-source-filesystem',
       options: {
-        name: `learn`,
+        name: 'learn',
         path: `${__dirname}/src/documentation/`,
-        include: [`**/*.md`], // ignore files starting with a dot
+        include: ['**/*.md'], // ignore files starting with a dot
       },
     },
+
     {
-      resolve: `gatsby-plugin-manifest`,
+      resolve: 'gatsby-plugin-manifest',
       options: {
         name: config.title,
+        /* eslint-disable @typescript-eslint/camelcase */
         short_name: config.title,
         start_url: '/',
         background_color: config.color,
         theme_color: config.color,
+        /* eslint-disable @typescript-eslint/camelcase */
         display: config.display,
         icon: config.icon,
       },
     },
     'gatsby-plugin-offline',
-    `gatsby-plugin-typescript`,
+    'gatsby-plugin-typescript',
     {
       resolve: 'gatsby-transformer-remark',
       options: {
         plugins: [
           {
-            resolve: `gatsby-remark-autolink-headers`,
+            resolve: 'gatsby-remark-autolink-headers',
             options: {
-              offsetY: `125`,
-              icon: `<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><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>`,
-              className: `autolink-headers`,
+              offsetY: '125',
+              icon:
+                '<svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><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>',
+              className: 'autolink-headers',
               maintainCase: false,
               removeAccents: true,
             },
           },
           {
-            resolve: `gatsby-remark-prismjs`,
+            resolve: 'gatsby-remark-prismjs',
             options: {
               classPrefix: 'language-',
               inlineCodeMarker: null,
@@ -70,7 +75,7 @@ module.exports = {
             },
           },
           {
-            resolve: `gatsby-remark-images`,
+            resolve: 'gatsby-remark-images',
             options: {
               maxWidth: 590,
             },
@@ -79,7 +84,7 @@ module.exports = {
       },
     },
     {
-      resolve: `gatsby-plugin-sitemap`,
+      resolve: 'gatsby-plugin-sitemap',
       options: {
         query: `{
           site {
@@ -106,28 +111,23 @@ module.exports = {
           }
         }`,
         serialize: ({ site, allSitePage, allMarkdownRemark }) => {
-          let pages = [];
-          allSitePage.edges.map(edge => {
-            pages.push({
-              url: site.siteMetadata.siteUrlNoSlash + edge.node.path,
-              changefreq: `daily`,
-              priority: 0.7,
-            });
-          });
-          allMarkdownRemark.edges.map(edge => {
-            pages.push({
-              url: `${site.siteMetadata.siteUrlNoSlash}/${edge.node.fields.slug}`,
-              changefreq: `daily`,
-              priority: 0.7,
-            });
-          });
+          const sitePages = allSitePage.edges.map(edge => ({
+            url: site.siteMetadata.siteUrlNoSlash + edge.node.path,
+            changefreq: 'daily',
+            priority: 0.7,
+          }));
+          const markdownRemark = allMarkdownRemark.edges.map(edge => ({
+            url: `${site.siteMetadata.siteUrlNoSlash}/${edge.node.fields.slug}`,
+            changefreq: 'daily',
+            priority: 0.7,
+          }));
 
-          return pages;
+          return sitePages.concat(markdownRemark);
         },
       },
     },
     {
-      resolve: `gatsby-plugin-emotion`,
+      resolve: 'gatsby-plugin-emotion',
     },
   ],
 };
diff --git a/gatsby-node.js b/gatsby-node.js
index 343cedf70d..ce0f99e1d4 100644
--- a/gatsby-node.js
+++ b/gatsby-node.js
@@ -1,8 +1,10 @@
-const createSlug = require('./src/util/createSlug');
+/* eslint-disable @typescript-eslint/no-var-requires */
+// Use in this file CommonJS syntax see https://www.gatsbyjs.org/docs/migrating-from-v1-to-v2/#convert-to-either-pure-commonjs-or-pure-es6
 const path = require('path');
+const createSlug = require('./src/util/createSlug');
 
 exports.createPages = ({ graphql, actions }) => {
-  const { createPage, createRedirect, createNodeField } = actions;
+  const { createPage } = actions;
 
   return new Promise((resolve, reject) => {
     const docTemplate = path.resolve('./src/templates/learn.tsx');
@@ -57,6 +59,7 @@ exports.createPages = ({ graphql, actions }) => {
         `
       ).then(result => {
         if (result.errors) {
+          // eslint-disable-next-line no-console
           console.log(result.errors);
           reject(result.errors);
         }
@@ -65,7 +68,7 @@ exports.createPages = ({ graphql, actions }) => {
         const docPages = [];
         edges.forEach(({ node }, index) => {
           const {
-            fields: { slug, authors },
+            fields: { slug },
             frontmatter: { title, section },
             parent: { relativePath },
           } = node;
@@ -117,10 +120,10 @@ exports.createPages = ({ graphql, actions }) => {
               next: page.next,
               previous: page.previous,
               relativePath: page.relativePath,
-              navigationData: navigationData,
+              navigationData,
             },
           });
-          if (page.slug === 'introduction-to-nodejs')
+          if (page.slug === 'introduction-to-nodejs') {
             createPage({
               path: `/learn`,
               component: docTemplate,
@@ -129,32 +132,33 @@ exports.createPages = ({ graphql, actions }) => {
                 next: page.next,
                 previous: page.previous,
                 relativePath: page.relativePath,
-                navigationData: navigationData,
+                navigationData,
               },
             });
+          }
         });
       })
     );
   });
 };
 
-exports.onCreateNode = ({ node, getNode, actions }) => {
+exports.onCreateNode = ({ node, actions }) => {
   if (node.internal.type === 'MarkdownRemark') {
     const { createNodeField } = actions;
 
     const slug = createSlug(node.frontmatter.title);
     createNodeField({
       node,
-      name: `slug`,
+      name: 'slug',
       value: slug,
     });
 
-    let authors = node.frontmatter.authors;
+    let { authors } = node.frontmatter;
     if (authors) {
       authors = authors.split(',');
       createNodeField({
         node,
-        name: `authors`,
+        name: 'authors',
         value: authors,
       });
     }
diff --git a/package.json b/package.json
index ab6a3b5718..0639f48280 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "dotenv": "^6.0.0",
     "emotion": "^10.0.7",
     "emotion-server": "^10.0.7",
+    "eslint-plugin-jest": "^22.17.0",
     "gatsby": "^2.13.13",
     "gatsby-plugin-canonical-urls": "^2.0.10",
     "gatsby-plugin-catch-links": "^2.0.9",
@@ -31,7 +32,6 @@
     "react-dom": "^16.8.0",
     "react-emotion": "^10.0.0",
     "react-helmet": "^5.2.0",
-    "tslint": "^5.11.0",
     "typescript": "^3.1.1"
   },
   "keywords": [
@@ -43,14 +43,15 @@
     "build": "gatsby build",
     "build-ci": "gatsby build --prefix-paths",
     "start": "gatsby develop",
-    "format": "prettier --write '**/*.{ts,tsx,js}'",
+    "format": "yarn lint:fix",
     "format-check": "prettier --check '**/*.{ts,tsx,js}'",
     "jest": "jest",
     "update-snapshot": "jest --updateSnapshot",
-    "test": "yarn format-check && yarn tslint && yarn jest",
+    "test": "yarn lint && yarn jest",
     "test-watch": "yarn jest --watch",
     "test-ci": "yarn test --coverage && codecov",
-    "tslint": "tslint --project ./tsconfig.json",
+    "lint": "eslint . --ext .js,.ts,.tsx --ignore-pattern test/",
+    "lint:fix": "yarn lint --fix",
     "serve": "yarn build && clear && gatsby serve"
   },
   "devDependencies": {
@@ -60,16 +61,25 @@
     "@commitlint/config-conventional": "^7.3.1",
     "@types/jest": "^24.0.5",
     "@types/react-test-renderer": "^16.8.1",
+    "@typescript-eslint/eslint-plugin": "^1.4.2",
     "babel-jest": "^24.1.0",
     "babel-preset-gatsby": "^0.1.7",
     "codecov": "^3.3.0",
+    "eslint": "^5.14.1",
+    "eslint-config-airbnb": "^17.1.0",
+    "eslint-config-prettier": "^4.1.0",
+    "eslint-import-resolver-typescript": "^1.1.1",
+    "eslint-plugin-import": "^2.16.0",
+    "eslint-plugin-jsx-a11y": "^6.2.1",
+    "eslint-plugin-prettier": "^3.1.0",
+    "eslint-plugin-react": "^7.12.4",
+    "eslint-plugin-react-hooks": "^1.4.0",
     "husky": "^1.3.1",
     "identity-obj-proxy": "^3.0.0",
     "jest": "^24.1.0",
     "prettier": "^1.16.4",
     "react-test-renderer": "^16.8.2",
-    "tslint-config-prettier": "^1.15.0",
-    "tslint-react": "^3.6.0"
+    "typescript": "~3.2.1"
   },
   "repository": {
     "type": "git",
@@ -103,7 +113,7 @@
   "husky": {
     "hooks": {
       "commit-msg": "commitlint --edit $HUSKY_GIT_PARAMS",
-      "pre-push": "yarn format-check && yarn tslint"
+      "pre-push": "yarn lint"
     }
   }
 }
diff --git a/src/components/article.tsx b/src/components/article.tsx
index d160200819..1e96d7852c 100644
--- a/src/components/article.tsx
+++ b/src/components/article.tsx
@@ -5,7 +5,7 @@ import EditLink from './edit-link';
 import Pagination from './pagination';
 import TOC from './toc';
 
-type Props = {
+interface Props {
   title: string;
   html: string;
   tableOfContents: string;
@@ -13,7 +13,7 @@ type Props = {
   relativePath: string;
   next?: PaginationInfo;
   previous?: PaginationInfo;
-};
+}
 
 const Article = ({
   title,
@@ -23,10 +23,11 @@ const Article = ({
   next,
   relativePath,
   authors,
-}: Props) => (
+}: Props): JSX.Element => (
   <article className="article-reader">
     <h1 className="article-reader__headline">{title}</h1>
     <TOC heading="TABLE OF CONTENTS" tableOfContents={tableOfContents} />
+    {/* eslint-disable react/no-danger */}
     <div dangerouslySetInnerHTML={{ __html: html }} />
     <AuthorsList authors={authors} />
     <EditLink relativePath={relativePath} />
diff --git a/src/components/author.tsx b/src/components/author.tsx
index e1add552f6..ff1867ab32 100644
--- a/src/components/author.tsx
+++ b/src/components/author.tsx
@@ -22,21 +22,25 @@ const img: SerializedStyles = css`
   transition: all 0.2s ease-in-out;
 `;
 
-type Props = {
-  index: Number;
+interface Props {
+  index: number;
   username: string;
   size: string;
-};
+}
 
-const Author = ({ index, username, size = '64' }: Props) => {
+const Author = ({
+  index,
+  username,
+  size = '64',
+}: Props): null | JSX.Element => {
   if (!username) {
     return null;
   }
 
   // Clean up username and build links.
-  username = username.trim();
-  const githubLink = `https://github.com/${username}`;
-  const githubImgLink = `https://github.com/${username}.png?size=${size}`;
+  const githubUserName = username.trim();
+  const githubLink = `https://github.com/${githubUserName}`;
+  const githubImgLink = `https://github.com/${githubUserName}.png?size=${size}`;
 
   // If it's the first author then no margin left.
   const mleft = index === 0 ? { marginLeft: 0 } : {};
diff --git a/src/components/authors-list.tsx b/src/components/authors-list.tsx
index 7da3c8dfd8..559de866da 100644
--- a/src/components/authors-list.tsx
+++ b/src/components/authors-list.tsx
@@ -25,11 +25,11 @@ const list: SerializedStyles = css`
   }
 `;
 
-type Props = {
+interface Props {
   authors: string[];
-};
+}
 
-const AuthorsList = ({ authors }: Props) => {
+const AuthorsList = ({ authors }: Props): null | JSX.Element => {
   if (!authors) {
     return null;
   }
@@ -38,7 +38,7 @@ const AuthorsList = ({ authors }: Props) => {
     <ul css={list}>
       <h5>Contributors</h5>
       {authors.map(
-        (author, i) =>
+        (author, i): string | JSX.Element =>
           author && (
             <Author index={i} username={author} key={author} size="60" />
           )
diff --git a/src/components/edit-link.tsx b/src/components/edit-link.tsx
index 9c8bb3d759..56c6267d1f 100644
--- a/src/components/edit-link.tsx
+++ b/src/components/edit-link.tsx
@@ -30,11 +30,11 @@ const icon: SerializedStyles = css`
   vertical-align: middle;
 `;
 
-type Props = {
+interface Props {
   relativePath?: string;
-};
+}
 
-const EditLink = ({ relativePath }: Props) => {
+const EditLink = ({ relativePath }: Props): JSX.Element | null => {
   if (!relativePath) {
     return null;
   }
diff --git a/src/components/header.tsx b/src/components/header.tsx
index 8c36838a1b..06d8116c4c 100644
--- a/src/components/header.tsx
+++ b/src/components/header.tsx
@@ -1,7 +1,9 @@
 import { Link } from 'gatsby';
 import React from 'react';
 import { css, SerializedStyles } from '@emotion/core';
-import logo from '../images/logo.svg';
+
+/* eslint-disable-next-line @typescript-eslint/no-var-requires */
+const logo = require('../images/logo.svg');
 
 const ulStyles: SerializedStyles = css`
   @media (max-width: 380px) {
@@ -14,7 +16,7 @@ const ulStyles: SerializedStyles = css`
   list-style: none;
 `;
 
-const Header = () => (
+const Header = (): JSX.Element => (
   <nav className="nav">
     <ul css={ulStyles}>
       <li>
@@ -34,8 +36,9 @@ const Header = () => (
       <li style={{ flexGrow: 1 }} />
       <li className="nav__tabs nav__tabs--right">
         <button
+          type="button"
           className="dark-mode-toggle"
-          onClick={() => document.body.classList.toggle('dark-mode')}
+          onClick={(): boolean => document.body.classList.toggle('dark-mode')}
         >
           <span className="sr-only">Toggle Dark Mode</span>
           <i className="material-icons light-mode-only">nights_stay</i>
@@ -44,7 +47,11 @@ const Header = () => (
       </li>
 
       <li className="nav__tabs">
-        <a target="_blank" href="https://github.com/nodejs/nodejs.dev">
+        <a
+          target="_blank"
+          rel="noreferrer noopener"
+          href="https://github.com/nodejs/nodejs.dev"
+        >
           <span className="sr-only">GitHub</span>
           <svg
             width="2.0rem"
diff --git a/src/components/hero.tsx b/src/components/hero.tsx
index 580ef153ed..f53f74c614 100644
--- a/src/components/hero.tsx
+++ b/src/components/hero.tsx
@@ -1,10 +1,10 @@
 import React from 'react';
 
-type Props = {
+interface Props {
   title: string;
-};
+}
 
-const Hero = ({ title }: Props) => (
+const Hero = ({ title }: Props): JSX.Element => (
   <div className="hero">
     <h1>{title}</h1>
     <div className="diagonal-hero-bg">
diff --git a/src/components/layout.tsx b/src/components/layout.tsx
index feb7f96309..2383bbe9b3 100644
--- a/src/components/layout.tsx
+++ b/src/components/layout.tsx
@@ -1,57 +1,26 @@
 import 'prismjs/plugins/line-numbers/prism-line-numbers.css';
 import 'prismjs/themes/prism-okaidia.css';
-import React, { useEffect, useRef } from 'react';
+import React from 'react';
 import Header from './header';
 import '../styles/tokens.css';
 import '../styles/layout.css';
 import '../styles/mobile.css';
 import SEO from './seo';
-import { isMobileScreen } from '../util/isScreenWithinWidth';
-import { StickyChange, SentinelObserverSetupOptions } from '../types';
-import {
-  addFocusOutlineListeners,
-  removeFocusOutlineListeners,
-} from '../util/outlineOnKeyboardNav';
 
-type Props = {
+interface Props {
   children: React.ReactNode;
   title?: string;
   description?: string;
   img?: string;
-};
-
-const Layout = ({ children, title, description, img }: Props) => {
-  const prevOffset = useRef<number>(-1);
-
-  const magicHeroNumber = (): void => {
-    if (typeof window === 'undefined') {
-      // Guard for SSR
-      return;
-    }
-    const doc: Document = window.document;
-    if (!doc.body.dataset.browser) {
-      doc.body.dataset.browser = 'legacy';
-    }
-    const scrollingElement: HTMLElement | null = doc.scrollingElement as HTMLElement;
-    if (scrollingElement) {
-      const offset: number = Math.min(scrollingElement.scrollTop - 62, 210);
-      if (Math.abs(prevOffset.current - offset) > 5) {
-        prevOffset.current = offset;
-        doc.body.setAttribute(
-          'style',
-          `--magic-hero-number: ${356 - offset}px`
-        );
-      }
-    }
-    window.requestAnimationFrame(magicHeroNumber);
-  };
+}
 
+const Layout = ({ children, title, description, img }: Props): JSX.Element => {
   return (
-    <>
+    <React.Fragment>
       <SEO title={title} description={description} img={img} />
       <Header />
       <main>{children}</main>
-    </>
+    </React.Fragment>
   );
 };
 
diff --git a/src/components/navigation-item.tsx b/src/components/navigation-item.tsx
index 17f5d472f6..a3062ed058 100644
--- a/src/components/navigation-item.tsx
+++ b/src/components/navigation-item.tsx
@@ -1,7 +1,7 @@
 import React, { useRef, useEffect } from 'react';
 import { Link } from 'gatsby';
 
-type Props = {
+interface Props {
   key: string;
   isRead: boolean;
   isActive: boolean;
@@ -9,7 +9,7 @@ type Props = {
   title: string;
   onClick: () => void;
   autoScroll: (height: number) => void;
-};
+}
 
 const NavigationItem = ({
   isRead,
@@ -18,7 +18,7 @@ const NavigationItem = ({
   title,
   onClick,
   autoScroll,
-}: Props) => {
+}: Props): JSX.Element => {
   let className = 'side-nav__item ';
   if (isRead) {
     className += 'side-nav__item--done';
@@ -26,12 +26,13 @@ const NavigationItem = ({
     className += 'side-nav__item--active';
   }
   const element = useRef<HTMLAnchorElement | null>(null);
-  const handleRef = (ref?: HTMLAnchorElement | null) => {
+  const handleRef = (ref?: HTMLAnchorElement | null): void => {
     if (ref && isActive) {
       element.current = ref;
     }
   };
-  useEffect(() => {
+
+  useEffect((): void => {
     if (element.current) {
       const height = element.current.getBoundingClientRect().top;
       autoScroll(height);
@@ -40,7 +41,7 @@ const NavigationItem = ({
 
   return (
     <Link
-      ref={handleRef}
+      innerRef={handleRef}
       to={`/learn/${slug}`}
       onClick={onClick}
       className={className}
diff --git a/src/components/navigation-section.tsx b/src/components/navigation-section.tsx
index 5e4219ff68..40961630f9 100644
--- a/src/components/navigation-section.tsx
+++ b/src/components/navigation-section.tsx
@@ -2,7 +2,7 @@ import React from 'react';
 import { NavigationSectionItem } from '../types';
 import NavigationItem from './navigation-item';
 
-type Props = {
+interface Props {
   key: string;
   title: string;
   section: NavigationSectionItem[];
@@ -10,7 +10,7 @@ type Props = {
   onItemClick: () => void;
   readSections: Set<NavigationSectionItem['slug']>;
   autoScroll: (height: number) => void;
-};
+}
 
 const NavigationSection = ({
   title,
@@ -19,11 +19,11 @@ const NavigationSection = ({
   onItemClick,
   readSections,
   autoScroll,
-}: Props) => {
-  return (
-    <ul className="side-nav__list">
-      <h2 className="side-nav__title">{title}</h2>
-      {section.map((item: NavigationSectionItem) => {
+}: Props): JSX.Element => (
+  <ul className="side-nav__list">
+    <h2 className="side-nav__title">{title}</h2>
+    {section.map(
+      (item: NavigationSectionItem): JSX.Element => {
         const isRead: boolean = readSections.has(item.slug);
 
         return (
@@ -37,9 +37,9 @@ const NavigationSection = ({
             autoScroll={autoScroll}
           />
         );
-      })}
-    </ul>
-  );
-};
+      }
+    )}
+  </ul>
+);
 
 export default NavigationSection;
diff --git a/src/components/navigation.tsx b/src/components/navigation.tsx
index 70e4216df3..264e0af51f 100644
--- a/src/components/navigation.tsx
+++ b/src/components/navigation.tsx
@@ -4,22 +4,22 @@ import { NavigationSectionData, NavigationSectionItem } from '../types';
 import { isSmallScreen } from '../util/isScreenWithinWidth';
 import { scrollTo, calcNavScrollParams } from '../util/scrollTo';
 
-type Props = {
+interface Props {
   sections: NavigationSectionData;
   currentSlug: string;
-};
+}
 
-const Navigation = ({ sections, currentSlug }: Props) => {
+const Navigation = ({ sections, currentSlug }: Props): JSX.Element => {
   const [isOpen, setIsOpen] = useState<boolean>(false);
   const [hasScrolled, setHasScrolled] = useState<boolean>(false);
   const navElement = useRef<HTMLElement | null>(null);
-  const toggle = () => setIsOpen(!isOpen);
-  const onItemClick = () => {
+  const toggle = (): void => setIsOpen(!isOpen);
+  const onItemClick = (): void => {
     if (isSmallScreen()) {
       toggle();
     }
   };
-  const autoScroll = async (height: number) => {
+  const autoScroll = async (height: number): Promise<void> => {
     if (isOpen && !hasScrolled && navElement.current) {
       const { newScrollPos, scrollWindow, scrollTime } = calcNavScrollParams(
         height,
@@ -41,9 +41,9 @@ const Navigation = ({ sections, currentSlug }: Props) => {
   const readSections: Set<NavigationSectionItem['slug']> = new Set();
   // Assume section items up to the one currently open have been read. Track
   // their unique slugs in `readSections` set.
-  Object.keys(sections).some(sectionKey => {
-    let isCurrentSlug: boolean = false;
-    sections[sectionKey].some(sectionItem => {
+  Object.keys(sections).some((sectionKey): boolean => {
+    let isCurrentSlug = false;
+    sections[sectionKey].some((sectionItem): boolean => {
       isCurrentSlug = sectionItem.slug === currentSlug;
       if (!isCurrentSlug) {
         readSections.add(sectionItem.slug);
@@ -57,10 +57,10 @@ const Navigation = ({ sections, currentSlug }: Props) => {
 
   return (
     <nav className={className} ref={navElement}>
-      <button className="side-nav__open" onClick={toggle}>
+      <button type="button" className="side-nav__open" onClick={toggle}>
         Menu
       </button>
-      {Object.keys(sections).map((sectionKey: string) => (
+      {Object.keys(sections).map((sectionKey: string): JSX.Element[] => (
         <NavigationSection
           key={sectionKey}
           title={sectionKey}
diff --git a/src/components/pagination.tsx b/src/components/pagination.tsx
index 543fae0fbb..dfd1db60d0 100644
--- a/src/components/pagination.tsx
+++ b/src/components/pagination.tsx
@@ -17,10 +17,10 @@ const link: SerializedStyles = css`
   }
 `;
 
-type Props = {
+interface Props {
   previous?: PaginationInfo;
   next?: PaginationInfo;
-};
+}
 
 const ulStyles: SerializedStyles = css`
   display: flex;
@@ -30,7 +30,7 @@ const ulStyles: SerializedStyles = css`
   padding: 5rem 0;
 `;
 
-const Pagination = ({ previous, next }: Props) => (
+const Pagination = ({ previous, next }: Props): JSX.Element => (
   <ul css={ulStyles}>
     <li>
       {previous && previous.title && (
diff --git a/src/components/release-table.tsx b/src/components/release-table.tsx
index af0199caaa..87465c9f8c 100644
--- a/src/components/release-table.tsx
+++ b/src/components/release-table.tsx
@@ -1,6 +1,11 @@
 import React from 'react';
+import { ReleaseData } from '../hooks/useReleaseHistory';
 
-const ReleaseTable = ({ releases }) => {
+interface Props {
+  releases: ReleaseData[];
+}
+
+const ReleaseTable = ({ releases }: Props): JSX.Element => {
   return (
     <table>
       <thead>
@@ -15,34 +20,36 @@ const ReleaseTable = ({ releases }) => {
         </tr>
       </thead>
       <tbody>
-        {releases.map(({ version, date, files, npm, v8, lts }) => {
-          const majorVersion = version.substring(1).split('.')[0];
+        {releases.map(
+          ({ version, date, npm, v8, lts }: ReleaseData): JSX.Element => {
+            const majorVersion = version.substring(1).split('.')[0];
 
-          return (
-            <tr key={version}>
-              <td>{version}</td>
-              <td>{lts ? lts : ''}</td>
-              <td>{date}</td>
-              <td>{v8}</td>
-              <td>{npm}</td>
-              <td>ABI?</td>
-              <td>
-                <a
-                  href={`https://github.com/nodejs/node/blob/master/doc/changelogs/CHANGELOG_V${majorVersion}.md#${version.substring(
-                    1
-                  )}`}
-                >
-                  Changelog
-                </a>
-              </td>
-              <td>
-                <a href={`https://nodejs.org/download/release/${version}/`}>
-                  Download
-                </a>
-              </td>
-            </tr>
-          );
-        })}
+            return (
+              <tr key={version}>
+                <td>{version}</td>
+                <td>{lts || ''}</td>
+                <td>{date}</td>
+                <td>{v8}</td>
+                <td>{npm}</td>
+                <td>ABI?</td>
+                <td>
+                  <a
+                    href={`https://github.com/nodejs/node/blob/master/doc/changelogs/CHANGELOG_V${majorVersion}.md#${version.substring(
+                      1
+                    )}`}
+                  >
+                    Changelog
+                  </a>
+                </td>
+                <td>
+                  <a href={`https://nodejs.org/download/release/${version}/`}>
+                    Download
+                  </a>
+                </td>
+              </tr>
+            );
+          }
+        )}
       </tbody>
     </table>
   );
diff --git a/src/components/seo.tsx b/src/components/seo.tsx
index 8482023493..0f907bd8bf 100644
--- a/src/components/seo.tsx
+++ b/src/components/seo.tsx
@@ -2,13 +2,13 @@ import React from 'react';
 import { Helmet } from 'react-helmet';
 import config from '../config';
 
-type Props = {
+interface Props {
   title?: string;
   description?: string;
   img?: string;
-};
+}
 
-const SEO = ({ title, description, img }: Props) => (
+const SEO = ({ title, description, img }: Props): JSX.Element => (
   <Helmet
     title={title || config.title}
     meta={[
diff --git a/src/components/toc.tsx b/src/components/toc.tsx
index 290b2caf4a..0a82279fcc 100644
--- a/src/components/toc.tsx
+++ b/src/components/toc.tsx
@@ -1,23 +1,24 @@
 import React from 'react';
 import { fixTocCodeTag } from '../util/tocFormatter';
 
-type Props = {
+interface Props {
   heading: string;
   tableOfContents: string;
-};
+}
 
-const TOC = ({ heading, tableOfContents }: Props) => {
+const TOC = ({ heading, tableOfContents }: Props): null | JSX.Element => {
   if (!tableOfContents) {
     return null;
   }
-  tableOfContents = fixTocCodeTag(tableOfContents);
+  const toc = fixTocCodeTag(tableOfContents);
 
   return (
     <details className="toc">
       <summary>
         <h6>{heading}</h6>
       </summary>
-      <div dangerouslySetInnerHTML={{ __html: tableOfContents }} />
+      {/* eslint-disable react/no-danger */}
+      <div dangerouslySetInnerHTML={{ __html: toc }} />
     </details>
   );
 };
diff --git a/src/config.js b/src/config.js
index 902541968b..30c50113a2 100644
--- a/src/config.js
+++ b/src/config.js
@@ -3,21 +3,22 @@
  */
 
 module.exports = {
-  title: `Node.js`,
-  description: `Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine.`,
-  siteUrl: `https://nodejs.dev/`,
-  siteUrlNoSlash: `https://nodejs.dev`,
-  featuredImage: `https://nodejs.org/static/images/logo-hexagon-card.png`,
-  color: `#6cc24a`,
-  icon: `src/images/favicon.png`, // This path is relative to the root of the site.
-  lang: `en`,
-  display: `browser`,
-  ogType: `website`,
-  ogImgType: `image/png`,
-  ogImgWidth: `224`,
-  ogImgHeight: `256`,
-  twitter: `@nodejs`,
-  twitterCard: `summary`,
-  twitterImgAlt: `The Node.js Hexagon Logo`,
-  facebook: `https://www.facebook.com/nodejsfoundation/`,
+  title: 'Node.js',
+  description:
+    "Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine.",
+  siteUrl: 'https://nodejs.dev/',
+  siteUrlNoSlash: 'https://nodejs.dev',
+  featuredImage: 'https://nodejs.org/static/images/logo-hexagon-card.png',
+  color: '#6cc24a',
+  icon: 'src/images/favicon.png', // This path is relative to the root of the site.
+  lang: 'en',
+  display: 'browser',
+  ogType: 'website',
+  ogImgType: 'image/png',
+  ogImgWidth: '224',
+  ogImgHeight: '256',
+  twitter: '@nodejs',
+  twitterCard: 'summary',
+  twitterImgAlt: 'The Node.js Hexagon Logo',
+  facebook: 'https://www.facebook.com/nodejsfoundation/',
 };
diff --git a/src/hooks/useApiDocs.tsx b/src/hooks/useApiDocs.tsx
index 95a9473ae2..583e3f26a1 100644
--- a/src/hooks/useApiDocs.tsx
+++ b/src/hooks/useApiDocs.tsx
@@ -1,4 +1,5 @@
 import { useState, useEffect } from 'react';
+
 export interface ApiDocsMeta {
   added: string[];
   changes: string[];
@@ -91,8 +92,8 @@ export function useApiData(version: string | null): APIResponse {
     modules: [],
   });
 
-  useEffect(() => {
-    const fetchData = async () => {
+  useEffect((): void => {
+    const fetchData = async (): Promise<void> => {
       const res = await window.fetch(
         `https://nodejs.org/dist/${version}/docs/api/all.json`
       );
diff --git a/src/hooks/useReleaseHistory.tsx b/src/hooks/useReleaseHistory.tsx
index 14b3552f9d..de598bad28 100644
--- a/src/hooks/useReleaseHistory.tsx
+++ b/src/hooks/useReleaseHistory.tsx
@@ -7,19 +7,21 @@ export interface ReleaseData {
   lts: boolean;
   v8: string;
   npm?: string;
-  modules?: String;
+  modules?: string;
   openssl?: string;
   security?: boolean;
   uv?: string;
   zlib?: string;
 }
 
-export function useReleaseHistory() {
+export function useReleaseHistory(): ReleaseData[] {
   const releasesURL = 'https://nodejs.org/dist/index.json';
   const [releaseHistory, setReleaseHistory] = useState<ReleaseData[]>([]);
-  useEffect(() => {
-    const fetchData = async () => {
-      const result = await fetch(releasesURL).then(data => data.json());
+  useEffect((): void => {
+    const fetchData = async (): Promise<void> => {
+      const result = await fetch(releasesURL).then(
+        (data): Promise<ReleaseData[]> => data.json()
+      );
       setReleaseHistory(result);
     };
     fetchData();
diff --git a/src/pages/404.tsx b/src/pages/404.tsx
index b1b89025d4..c2a0ef33e9 100644
--- a/src/pages/404.tsx
+++ b/src/pages/404.tsx
@@ -2,7 +2,7 @@ import React from 'react';
 import Hero from '../components/hero';
 import Layout from '../components/layout';
 
-export default () => {
+export default function NotFoundPage(): JSX.Element {
   const title = 'PAGE NOT FOUND';
   const description = 'You have hit a route that does not exist.';
 
@@ -11,13 +11,14 @@ export default () => {
       <Hero title={title} />
       <article style={{ width: '100%' }} className="article-reader">
         <p>
-          The page you're trying to access does not exist. Go back to the
-          Homepage or find what you're looking for in the menu.
+          The page you&apos;re trying to access does not exist. Go back to the
+          Homepage or find what you&apos;re looking for in the menu.
         </p>
         <p>
-          Take me back to the <a href="/">Homepage</a> →
+          Take me back to the
+          <a href="/">Homepage</a>
         </p>
       </article>
     </Layout>
   );
-};
+}
diff --git a/src/pages/docs.tsx b/src/pages/docs.tsx
index d82d8d5888..bad341ef16 100644
--- a/src/pages/docs.tsx
+++ b/src/pages/docs.tsx
@@ -1,29 +1,38 @@
 import React, { useState } from 'react';
 import { useApiData, useReleaseHistory } from '../hooks';
-import { ApiDocsObj, APIResponse, isModuleObj } from '../hooks/useApiDocs';
+import { ApiDocsObj, APIResponse } from '../hooks/useApiDocs';
 import Layout from '../components/layout';
 
 import '../styles/docs.css';
 
-function renderArticleOverview(obj: ApiDocsObj, overview: JSX.Element[] = []) {
+function renderArticleOverview(
+  obj: ApiDocsObj,
+  overview: JSX.Element[] = []
+): JSX.Element[] {
   const children: JSX.Element[] = [];
   if (obj.events) {
-    obj.events.map(evt => renderArticleOverview(evt, children));
+    obj.events.map((evt): JSX.Element[] =>
+      renderArticleOverview(evt, children)
+    );
   }
   if (obj.methods) {
-    obj.methods.map(method => renderArticleOverview(method, children));
+    obj.methods.map((method): JSX.Element[] =>
+      renderArticleOverview(method, children)
+    );
   }
   if (obj.properties) {
     obj.properties
-      .filter(o => o.type !== 'Object')
-      .map(prop => renderArticleOverview(prop, children));
+      .filter((o): boolean => o.type !== 'Object')
+      .map((prop): JSX.Element[] => renderArticleOverview(prop, children));
 
     obj.properties
-      .filter(o => o.type === 'Object')
-      .map(prop => renderArticleOverview(prop, children));
+      .filter((o): boolean => o.type === 'Object')
+      .map((prop): JSX.Element[] => renderArticleOverview(prop, children));
   }
   if (obj.classes) {
-    obj.classes.map(klass => renderArticleOverview(klass, children));
+    obj.classes.map((klass): JSX.Element[] =>
+      renderArticleOverview(klass, children)
+    );
   }
 
   overview.push(
@@ -47,7 +56,7 @@ function renderArticleOverview(obj: ApiDocsObj, overview: JSX.Element[] = []) {
   return overview;
 }
 
-function renderArticle(page: ApiDocsObj | null) {
+function renderArticle(page: ApiDocsObj | null): JSX.Element {
   if (!page) {
     return <article>No Page Found</article>;
   }
@@ -58,8 +67,11 @@ function renderArticle(page: ApiDocsObj | null) {
       <ul className="api-key">
         {renderArticleOverview(page)}
         {page.modules &&
-          page.modules.map(mod => renderArticleOverview(mod, []))}
+          page.modules.map((mod): JSX.Element[] =>
+            renderArticleOverview(mod, [])
+          )}
       </ul>
+      {/* eslint-disable-next-line react/no-danger */}
       {page.desc && <p dangerouslySetInnerHTML={{ __html: page.desc }} />}
     </article>
   );
@@ -70,7 +82,7 @@ function sideBarSection(
   section: keyof APIResponse,
   data: APIResponse,
   setPage: Function
-) {
+): JSX.Element {
   return (
     <li className="api-nav__list-item">
       <h2 className="t-body2 api-nav__list-title">
@@ -82,7 +94,7 @@ function sideBarSection(
           <li key={module.name} className="api-nav__sub-list-item">
             <a
               href="#"
-              onClick={() => setPage(module)}
+              onClick={(): void => setPage(module)}
               className="t-body2 api-nav__sub-list-link"
             >
               {module.displayName || module.name}
@@ -94,7 +106,7 @@ function sideBarSection(
   );
 }
 
-export default () => {
+export default function APIDocsPage(): JSX.Element {
   const title = 'API Docs';
   const description = 'Come learn yourself something.';
   const [version, setVersion] = useState<string | null>(null);
@@ -103,7 +115,7 @@ export default () => {
   // Magical function filters out all major versions less than 6.
   // TODO: Remove the magical number for the major version. Fet from dynamic releases data to filter out EOL'd versions.
   const releases = useReleaseHistory().filter(
-    r => parseInt(r.version.slice(1), 10) >= 6
+    (r): boolean => parseInt(r.version.slice(1), 10) >= 6
   );
   const apiData = useApiData(
     version || (releases[0] && releases[0].version) || null
@@ -116,16 +128,18 @@ export default () => {
           <li className="api-nav__list-item">
             <select
               className="api-nav__version"
-              onChange={e => {
+              onChange={(e): void => {
                 setPage(null);
                 setVersion(e.target.value);
               }}
             >
-              {releases.map(release => (
-                <option value={release.version} key={release.version}>
-                  {release.version}
-                </option>
-              ))}
+              {releases.map(
+                (release): JSX.Element => (
+                  <option value={release.version} key={release.version}>
+                    {release.version}
+                  </option>
+                )
+              )}
             </select>
           </li>
           {sideBarSection('Globals', 'globals', apiData, setPage)}
@@ -138,4 +152,4 @@ export default () => {
       {renderArticle(page)}
     </Layout>
   );
-};
+}
diff --git a/src/pages/download.tsx b/src/pages/download.tsx
index 660c995d8b..7292595131 100644
--- a/src/pages/download.tsx
+++ b/src/pages/download.tsx
@@ -4,7 +4,7 @@ import Hero from '../components/hero';
 import Layout from '../components/layout';
 import ReleaseTable from '../components/release-table';
 
-export default () => {
+export default function DownloadPage(): JSX.Element {
   const releaseHistory = useReleaseHistory().slice(0, 25);
   const title = 'Download Node.js';
   const description = 'Come get me!';
@@ -14,8 +14,8 @@ export default () => {
       <Hero title={title} />
       <article style={{ width: '100%' }} className="article-reader">
         <p>Welcome to the Downloads Page!</p>
-        <ReleaseTable style={{ width: '100%' }} releases={releaseHistory} />
+        <ReleaseTable releases={releaseHistory} />
       </article>
     </Layout>
   );
-};
+}
diff --git a/src/pages/index.tsx b/src/pages/index.tsx
index 1095788de2..5e9fabac9f 100644
--- a/src/pages/index.tsx
+++ b/src/pages/index.tsx
@@ -5,17 +5,17 @@ import Layout from '../components/layout';
 import './konami.js';
 
 let discoMode: NodeJS.Timeout | null = null;
-document.addEventListener('konamiCode', () => {
+document.addEventListener('konamiCode', (): void => {
   if (discoMode) {
     return clearInterval(discoMode);
   }
   discoMode = setInterval(
-    () => document.body.classList.toggle('dark-mode'),
+    (): boolean => document.body.classList.toggle('dark-mode'),
     300
   );
 });
 
-export default () => {
+export default function HomePage(): JSX.Element {
   const title = 'Home Page';
   const description = 'Welcome to Node.js!';
 
@@ -27,4 +27,4 @@ export default () => {
       </article>
     </Layout>
   );
-};
+}
diff --git a/src/pages/konami.js b/src/pages/konami.js
index ad3701c7ae..0350b79538 100644
--- a/src/pages/konami.js
+++ b/src/pages/konami.js
@@ -1,13 +1,12 @@
-(function() {
-  'use strict';
-
+(function konami() {
   // http://stackoverflow.com/a/9849276
-  function _contains(a, b) {
+  function contains(a, b) {
+    // eslint-disable-next-line no-bitwise
     return !!~a.indexOf(b);
   }
 
-  var konamiCode = {
-    init: function() {
+  const konamiCode = {
+    init() {
       this.KEY_LEFT = 37;
       this.KEY_UP = 38;
       this.KEY_RIGHT = 39;
@@ -21,11 +20,11 @@
 
       return this;
     },
-    bindListener: function() {
-      var buffer = '';
-      var lastDate = new Date();
-      var konamiCodeEvent = new Event('konamiCode');
-      var validKeys = [
+    bindListener() {
+      let buffer = '';
+      let lastDate = new Date();
+      const konamiCodeEvent = new Event('konamiCode');
+      const validKeys = [
         this.KEY_LEFT,
         this.KEY_UP,
         this.KEY_RIGHT,
@@ -36,15 +35,15 @@
 
       document.addEventListener(
         'keyup',
-        function(ev) {
+        function enableKonami(ev) {
           if (
-            _contains(validKeys, ev.keyCode) &&
+            contains(validKeys, ev.keyCode) &&
             new Date() - lastDate <= this.maxDelay
           ) {
             lastDate = new Date();
-            buffer = buffer + ev.keyCode;
+            buffer += ev.keyCode;
 
-            if (_contains(buffer, this.CODE_SEQUENCE)) {
+            if (contains(buffer, this.CODE_SEQUENCE)) {
               document.dispatchEvent(konamiCodeEvent);
               buffer = '';
             }
diff --git a/src/pages/style-guide.tsx b/src/pages/style-guide.tsx
index ec9f6ba0b8..ee01e0b669 100644
--- a/src/pages/style-guide.tsx
+++ b/src/pages/style-guide.tsx
@@ -1,12 +1,7 @@
 import React from 'react';
 import '../styles/layout.css';
 
-type Props = {
-  heading: string;
-  tableOfContents: string;
-};
-
-const StyleGuidePage = ({ heading }: Props) => {
+const StyleGuidePage = (): JSX.Element => {
   return (
     <div style={{ maxWidth: `940px`, margin: `0 auto` }}>
       <div className="t-display1">Display1</div>
@@ -31,7 +26,8 @@ const StyleGuidePage = ({ heading }: Props) => {
         optimized for print, web, and mobile interfaces, and has excellent
         legibility characteristics in its letterforms.
       </p>
-      <a>This is a link</a>
+      {/* eslint-disable-next-line jsx-a11y/anchor-is-valid */}
+      <a href="#">This is a link</a>
     </div>
   );
 };
diff --git a/src/styles/layout.css b/src/styles/layout.css
index 93a6d57e87..d7f8b2b0bf 100644
--- a/src/styles/layout.css
+++ b/src/styles/layout.css
@@ -255,7 +255,7 @@ main {
   position: sticky;
   top: var(--nav-height);
   width: 100%;
-  max-width: 36.0rem;
+  max-width: 36rem;
   z-index: 998;
 }
 
@@ -316,14 +316,14 @@ main {
   border-radius: 50%;
   box-shadow: inset 0 0 0 2px var(--brand-light);
   box-sizing: border-box;
-  content: ' ';
+  content: " ";
   display: block;
   height: 2.4rem;
   left: -3.6rem;
   padding: 2px 4px;
   position: absolute;
   top: 1.2rem;
-  transition: box-shadow .28s;
+  transition: box-shadow 0.28s;
   overflow: hidden;
   width: 2.4rem;
 }
@@ -343,7 +343,7 @@ main {
 
 .side-nav__item::after {
   background: var(--brand-light);
-  content: ' ';
+  content: " ";
   display: block;
   height: calc(100% - 2.4rem - 8px);
   left: calc(-2.4rem - 1px);
@@ -367,13 +367,14 @@ main {
   text-indent: 3.2rem;
   line-height: 0;
   font-weight: 200;
-  transition: color .28s, background-color .28s;
+  transition: color 0.28s, background-color 0.28s;
   outline: none;
   background-clip: content-box;
   z-index: 9999;
 }
 
-.side-nav__open::before, .side-nav__open::after {
+.side-nav__open::before,
+.side-nav__open::after {
   content: "";
   width: 100%;
   height: 3px;
@@ -382,7 +383,7 @@ main {
   left: 0;
   transform: translateY(-250%);
   background-color: white;
-  transition: transform .28s;
+  transition: transform 0.28s;
 }
 
 .side-nav__open::after {
@@ -396,10 +397,10 @@ main {
   color: transparent;
   background-color: transparent;
 }
-.side-nav.side-nav--open  .side-nav__open::before {
+.side-nav.side-nav--open .side-nav__open::before {
   transform: rotate(-45deg);
 }
-.side-nav.side-nav--open  .side-nav__open::after {
+.side-nav.side-nav--open .side-nav__open::after {
   transform: rotate(45deg);
 }
 
@@ -439,9 +440,341 @@ main {
 /* End: Article Reader HTML Reset */
 
 .stars {
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#767676, 1048px 1929px #767676, 1793px 977px #767676, 88px 1353px #767676, 760px 178px #767676, 1135px 521px #767676, 1391px 1168px #767676, 1031px 1017px #767676, 1260px 586px #767676, 1077px 420px #767676, 1693px 431px #767676, 629px 1488px #767676, 958px 533px #767676, 389px 1979px #767676, 1064px 1815px #767676, 1725px 581px #767676, 739px 1529px #767676, 263px 1626px #767676, 1803px 320px #767676, 801px 107px #767676, 1832px 957px #767676, 1828px 374px #767676, 1117px 1432px #767676, 1691px 1206px #767676, 78px 834px #767676, 570px 1935px #767676, 37px 1288px #767676, 29px 1763px #767676, 208px 1143px #767676, 832px 945px #767676, 477px 1782px #767676, 1495px 858px #767676, 287px 1926px #767676, 1399px 782px #767676, 111px 1178px #767676, 1570px 1587px #767676, 1152px 543px #767676, 876px 655px #767676, 895px 1895px #767676, 1140px 1759px #767676, 290px 593px #767676, 1803px 1699px #767676, 1180px 1328px #767676, 1465px 1795px #767676, 825px 1490px #767676, 256px 1972px #767676, 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+    1634px 192px #767676, 1212px 1340px #767676, 1619px 1512px #767676,
+    611px 941px #767676, 113px 186px #767676, 1808px 510px #767676,
+    615px 1367px #767676, 547px 395px #767676, 1626px 1584px #767676,
+    1773px 397px #767676, 612px 1666px #767676, 361px 93px #767676,
+    1541px 1812px #767676, 911px 235px #767676, 120px 1681px #767676,
+    344px 1022px #767676, 1785px 53px #767676, 272px 400px #767676,
+    777px 573px #767676, 440px 1398px #767676, 1286px 1879px #767676,
+    1848px 1377px #767676, 1959px 1604px #767676, 1089px 1551px #767676,
+    1109px 1087px #767676, 1668px 1741px #767676, 1044px 1999px #767676,
+    660px 1671px #767676, 972px 1028px #767676, 1084px 655px #767676,
+    877px 1066px #767676, 457px 890px #767676, 424px 1492px #767676,
+    920px 867px #767676, 1546px 1409px #767676, 1729px 1482px #767676,
+    92px 1625px #767676, 468px 933px #767676, 1739px 683px #767676,
+    1130px 1578px #767676, 1340px 287px #767676, 828px 1961px #767676,
+    1130px 1823px #767676, 1810px 783px #767676, 1350px 631px #767676,
+    963px 1483px #767676, 1898px 1270px #767676, 1685px 1519px #767676,
+    1940px 1235px #767676, 57px 266px #767676, 1547px 92px #767676,
+    673px 1830px #767676, 900px 181px #767676, 132px 923px #767676,
+    1195px 113px #767676, 414px 1352px #767676, 1568px 304px #767676,
+    587px 1917px #767676, 269px 964px #767676, 1796px 1955px #767676,
+    798px 1513px #767676, 942px 615px #767676, 198px 860px #767676,
+    1473px 1891px #767676, 1519px 298px #767676, 100px 193px #767676,
+    721px 1199px #767676, 1395px 338px #767676, 25px 671px #767676,
+    75px 1685px #767676, 290px 214px #767676, 1185px 1821px #767676,
+    1312px 1188px #767676, 950px 2000px #767676, 1606px 1709px #767676,
+    931px 1565px #767676, 716px 382px #767676, 1117px 979px #767676,
+    1752px 1623px #767676, 1080px 766px #767676, 1145px 1667px #767676,
+    655px 278px #767676, 1679px 632px #767676, 1637px 1896px #767676,
+    490px 79px #767676, 1663px 266px #767676, 1392px 23px #767676,
+    718px 133px #767676, 350px 1808px #767676, 847px 1259px #767676,
+    1285px 271px #767676, 100px 661px #767676, 148px 1919px #767676,
+    997px 1803px #767676, 1137px 1362px #767676, 1094px 1280px #767676,
+    266px 645px #767676, 416px 914px #767676, 1994px 916px #767676,
+    581px 1984px #767676, 932px 296px #767676, 1651px 382px #767676,
+    615px 1703px #767676, 1144px 1925px #767676, 570px 29px #767676,
+    1561px 1744px #767676, 2px 1547px #767676, 561px 1310px #767676,
+    906px 683px #767676, 328px 1735px #767676, 1919px 1653px #767676,
+    327px 9px #767676, 735px 1315px #767676, 585px 444px #767676,
+    153px 724px #767676, 1724px 1871px #767676, 887px 410px #767676,
+    663px 1042px #767676, 251px 1924px #767676, 1663px 1258px #767676,
+    1413px 1126px #767676, 937px 876px #767676, 676px 1124px #767676,
+    1487px 1780px #767676, 1141px 1108px #767676, 513px 19px #767676,
+    1193px 1483px #767676, 1945px 1368px #767676, 1658px 218px #767676,
+    1858px 898px #767676, 1129px 1255px #767676, 1011px 1219px #767676,
+    1421px 1179px #767676, 114px 1124px #767676, 1407px 1753px #767676,
+    491px 1040px #767676, 1178px 1987px #767676, 1710px 1698px #767676,
+    1315px 1579px #767676, 48px 434px #767676, 1825px 879px #767676,
+    1381px 628px #767676, 1048px 1140px #767676, 1473px 718px #767676,
+    1420px 985px #767676, 902px 310px #767676, 1619px 324px #767676,
+    1083px 148px #767676, 1582px 1740px #767676, 1248px 1761px #767676,
+    1702px 1717px #767676, 627px 340px #767676, 1931px 1249px #767676,
+    1736px 627px #767676, 116px 1330px #767676, 96px 594px #767676,
+    1781px 1832px #767676, 1938px 1861px #767676, 1940px 1444px #767676,
+    266px 753px #767676, 91px 1090px #767676, 1393px 1746px #767676,
+    492px 178px #767676, 1556px 147px #767676, 1425px 1611px #767676,
+    282px 246px #767676, 500px 481px #767676, 515px 1947px #767676,
+    460px 1104px #767676, 931px 1472px #767676, 344px 226px #767676,
+    365px 107px #767676, 894px 1122px #767676, 1373px 1116px #767676,
+    507px 553px #767676, 966px 1895px #767676, 1587px 1357px #767676,
+    421px 652px #767676, 1893px 1500px #767676, 104px 1558px #767676,
+    456px 265px #767676, 1257px 1207px #767676, 1172px 906px #767676,
+    50px 1561px #767676, 1296px 30px #767676, 1098px 1529px #767676,
+    555px 723px #767676, 1458px 1919px #767676, 1146px 570px #767676,
+    1894px 973px #767676, 1777px 1570px #767676, 1917px 1004px #767676,
+    19px 927px #767676, 1882px 512px #767676, 1390px 1497px #767676,
+    99px 1521px #767676, 1796px 1847px #767676, 126px 1737px #767676,
+    600px 541px #767676, 1539px 391px #767676, 1689px 1531px #767676,
+    744px 92px #767676, 1000px 1339px #767676, 1697px 950px #767676,
+    1534px 745px #767676, 714px 272px #767676, 1931px 1036px #767676,
+    1063px 1547px #767676, 1790px 1484px #767676, 754px 612px #767676,
+    886px 878px #767676, 1588px 1882px #767676, 88px 1475px #767676,
+    920px 666px #767676, 1132px 1954px #767676, 825px 1000px #767676,
+    179px 1135px #767676, 919px 76px #767676, 1724px 1759px #767676,
+    1977px 1377px #767676, 1036px 1279px #767676, 1109px 658px #767676,
+    211px 188px #767676, 187px 180px #767676, 468px 1964px #767676,
+    1482px 244px #767676, 783px 772px #767676, 978px 431px #767676,
+    124px 388px #767676, 697px 1195px #767676, 404px 334px #767676,
+    1248px 572px #767676, 1888px 1144px #767676, 589px 132px #767676,
+    100px 425px #767676, 593px 648px #767676, 273px 643px #767676,
+    543px 1941px #767676, 427px 1843px #767676, 680px 293px #767676,
+    1495px 739px #767676, 526px 631px #767676, 1645px 567px #767676,
+    991px 949px #767676, 1027px 1570px #767676, 1335px 395px #767676,
+    1024px 1509px #767676, 1785px 250px #767676;
+  --stars-medium: 1120px 738px #767676, 533px 827px #767676, 339px 866px #767676,
+    1335px 1325px #767676, 1021px 435px #767676, 1850px 1972px #767676,
+    492px 1847px #767676, 1030px 1536px #767676, 1154px 1422px #767676,
+    533px 945px #767676, 1465px 1670px #767676, 411px 1474px #767676,
+    413px 526px #767676, 1155px 1946px #767676, 1469px 1277px #767676,
+    310px 1807px #767676, 936px 387px #767676, 397px 725px #767676,
+    228px 1790px #767676, 1124px 539px #767676, 1261px 63px #767676,
+    172px 881px #767676, 1042px 1984px #767676, 1153px 322px #767676,
+    1955px 662px #767676, 1951px 1981px #767676, 621px 248px #767676,
+    1589px 534px #767676, 1997px 667px #767676, 618px 660px #767676,
+    452px 259px #767676, 362px 1762px #767676, 735px 347px #767676,
+    783px 297px #767676, 1808px 408px #767676, 373px 740px #767676,
+    543px 1509px #767676, 1125px 1169px #767676, 1625px 483px #767676,
+    1461px 782px #767676, 460px 1210px #767676, 608px 1119px #767676,
+    132px 1503px #767676, 169px 660px #767676, 392px 1094px #767676,
+    1128px 567px #767676, 119px 1617px #767676, 1872px 60px #767676,
+    1192px 673px #767676, 1115px 1712px #767676, 1192px 873px #767676,
+    1375px 1486px #767676, 1031px 227px #767676, 510px 1459px #767676,
+    607px 1047px #767676, 752px 247px #767676, 1556px 135px #767676,
+    959px 915px #767676, 1071px 365px #767676, 318px 203px #767676,
+    1000px 573px #767676, 2000px 1250px #767676, 1566px 1478px #767676,
+    364px 1008px #767676, 1335px 1898px #767676, 580px 1162px #767676,
+    930px 1091px #767676, 1644px 1040px #767676, 1702px 1127px #767676,
+    1750px 1105px #767676, 708px 1310px #767676, 29px 392px #767676,
+    946px 1905px #767676, 407px 1326px #767676, 59px 927px #767676,
+    1717px 1944px #767676, 674px 301px #767676, 1018px 1346px #767676,
+    1376px 1697px #767676, 1402px 961px #767676, 1012px 1256px #767676,
+    999px 923px #767676, 1866px 1360px #767676, 1129px 533px #767676,
+    117px 797px #767676, 778px 855px #767676, 1809px 1485px #767676,
+    965px 1725px #767676, 780px 290px #767676, 205px 431px #767676,
+    1886px 1007px #767676, 163px 1912px #767676, 517px 1106px #767676,
+    527px 1428px #767676, 1258px 1921px #767676, 1544px 1149px #767676,
+    1829px 966px #767676, 1626px 1420px #767676, 402px 1275px #767676,
+    1952px 920px #767676, 738px 1364px #767676, 1598px 1288px #767676,
+    1461px 951px #767676, 1921px 782px #767676, 57px 943px #767676,
+    1123px 7px #767676, 763px 1524px #767676, 432px 847px #767676,
+    1479px 59px #767676, 1761px 258px #767676, 1410px 1609px #767676,
+    303px 58px #767676, 103px 1478px #767676, 1289px 221px #767676,
+    1265px 277px #767676, 1153px 1054px #767676, 1468px 314px #767676,
+    363px 453px #767676, 1946px 70px #767676, 1223px 876px #767676,
+    1780px 1010px #767676, 782px 1977px #767676, 1480px 1867px #767676,
+    451px 390px #767676, 1285px 321px #767676, 877px 1682px #767676,
+    1998px 365px #767676, 817px 1011px #767676, 926px 1147px #767676,
+    310px 368px #767676, 1234px 922px #767676, 658px 64px #767676,
+    1409px 200px #767676, 1200px 515px #767676, 1597px 1924px #767676,
+    1089px 1523px #767676, 1917px 995px #767676, 734px 1392px #767676,
+    1573px 174px #767676, 209px 1376px #767676, 1987px 1718px #767676,
+    1650px 796px #767676, 827px 1701px #767676, 1763px 961px #767676,
+    1387px 834px #767676, 1122px 1326px #767676, 7px 763px #767676,
+    666px 893px #767676, 1568px 947px #767676, 1460px 53px #767676,
+    618px 549px #767676, 527px 398px #767676, 1648px 1959px #767676,
+    1333px 956px #767676, 807px 695px #767676, 875px 147px #767676,
+    568px 1632px #767676, 986px 1215px #767676, 1057px 1737px #767676,
+    1352px 851px #767676, 1579px 853px #767676, 66px 1269px #767676,
+    1775px 1587px #767676, 703px 107px #767676, 393px 1303px #767676,
+    897px 1414px #767676, 812px 120px #767676, 1553px 1317px #767676,
+    1394px 606px #767676, 1504px 1659px #767676, 1007px 370px #767676,
+    964px 1028px #767676, 871px 1349px #767676, 803px 1218px #767676,
+    1851px 1273px #767676, 57px 432px #767676, 727px 1752px #767676,
+    1381px 998px #767676, 950px 412px #767676, 1118px 493px #767676,
+    549px 311px #767676, 1689px 983px #767676, 185px 1432px #767676,
+    425px 1761px #767676, 547px 291px #767676, 356px 1619px #767676,
+    516px 294px #767676, 458px 383px #767676, 1634px 1420px #767676,
+    1202px 1564px #767676, 1526px 821px #767676, 1401px 1242px #767676,
+    34px 1100px #767676, 1347px 1172px #767676, 854px 821px #767676,
+    1762px 467px #767676, 410px 1662px #767676, 1804px 19px #767676,
+    1997px 320px #767676, 1025px 1016px #767676;
+  --stars-large: 1783px 1852px #767676, 760px 523px #767676, 136px 446px #767676,
+    1618px 589px #767676, 769px 1696px #767676, 804px 1501px #767676,
+    1927px 1123px #767676, 46px 1079px #767676, 1682px 728px #767676,
+    1049px 479px #767676, 1427px 1116px #767676, 1951px 782px #767676,
+    1556px 827px #767676, 926px 382px #767676, 1851px 863px #767676,
+    1399px 1900px #767676, 634px 850px #767676, 1939px 1032px #767676,
+    1571px 1958px #767676, 1648px 1378px #767676, 33px 1171px #767676,
+    1848px 475px #767676, 1173px 1872px #767676, 1810px 409px #767676,
+    1957px 328px #767676, 1029px 45px #767676, 333px 584px #767676,
+    1998px 422px #767676, 480px 1216px #767676, 1432px 1888px #767676,
+    709px 606px #767676, 555px 1702px #767676, 58px 1863px #767676,
+    1839px 1633px #767676, 1349px 895px #767676, 1393px 1027px #767676,
+    799px 218px #767676, 923px 1581px #767676, 1277px 271px #767676,
+    142px 1086px #767676, 365px 41px #767676, 1135px 1148px #767676,
+    1101px 1518px #767676, 265px 1855px #767676, 1134px 167px #767676,
+    997px 770px #767676, 1172px 1332px #767676, 1573px 121px #767676,
+    1925px 853px #767676, 1951px 200px #767676, 777px 1093px #767676,
+    996px 278px #767676, 1328px 1296px #767676, 978px 535px #767676,
+    161px 288px #767676, 1466px 310px #767676, 638px 1368px #767676,
+    1407px 360px #767676, 704px 658px #767676, 1371px 1152px #767676,
+    1947px 1808px #767676, 1280px 1392px #767676, 51px 499px #767676,
+    1862px 1087px #767676, 563px 575px #767676, 165px 689px #767676,
+    1104px 708px #767676, 1279px 1339px #767676, 1561px 899px #767676,
+    1046px 49px #767676, 1916px 1992px #767676, 893px 1915px #767676,
+    1404px 1555px #767676, 1203px 330px #767676, 389px 1239px #767676,
+    69px 1152px #767676, 1566px 804px #767676, 341px 751px #767676,
+    1775px 724px #767676, 1281px 685px #767676, 244px 1397px #767676,
+    619px 1533px #767676, 169px 1812px #767676, 369px 1px #767676,
+    1705px 1430px #767676, 796px 1998px #767676, 1801px 534px #767676,
+    749px 1038px #767676, 429px 1533px #767676, 536px 1902px #767676,
+    261px 1700px #767676, 1630px 511px #767676, 863px 925px #767676,
+    435px 621px #767676, 221px 191px #767676, 734px 660px #767676,
+    1032px 1017px #767676, 832px 1594px #767676, 1757px 962px #767676,
+    652px 1291px #767676;
   height: 100%;
   left: 0;
   overflow: hidden;
@@ -474,7 +807,7 @@ main {
   width: 2px;
 }
 
-.stars>.medium::after {
+.stars > .medium::after {
   content: " ";
   background: transparent;
   box-shadow: var(--stars-medium);
diff --git a/src/styles/mobile.css b/src/styles/mobile.css
index 55c15456f9..caad0340c9 100644
--- a/src/styles/mobile.css
+++ b/src/styles/mobile.css
@@ -1,7 +1,7 @@
 @media (max-width: 1262px) and (min-width: 721px) {
   body {
     --banner-clip: polygon(0 0, 100% 0, 100% calc(100% - 52px), 0 100%);
-    --hero-height: 36.0rem;
+    --hero-height: 36rem;
   }
 
   .article-reader {
@@ -13,7 +13,7 @@
   }
 
   .side-nav {
-    margin-right: -36.0rem;
+    margin-right: -36rem;
     margin-bottom: calc(-100vh + var(--nav-height));
     pointer-events: none;
     overflow: hidden;
@@ -28,7 +28,7 @@
     top: 0;
     background-color: var(--black0);
     transform: translateX(-120%);
-    transition: transform .28s;
+    transition: transform 0.28s;
     pointer-events: none;
     z-index: -1;
     box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.33), 2px 0 3px rgba(0, 0, 0, 0.2);
@@ -50,7 +50,7 @@
 
   .side-nav__list {
     transform: translateX(-120%);
-    transition: transform .28s;
+    transition: transform 0.28s;
     pointer-events: none;
   }
 
@@ -63,13 +63,13 @@
     left: 20rem;
   }
 
-  .side-nav__open, .side-nav.side-nav--open .side-nav__open {
+  .side-nav__open,
+  .side-nav.side-nav--open .side-nav__open {
     top: 34px;
     margin-top: 0;
     display: block;
     pointer-events: all;
   }
-
 }
 
 @media (max-width: 720px) {
@@ -80,7 +80,12 @@
   body {
     --nav-height: 5.2rem;
     --hero-height: 92px;
-    --banner-clip: polygon(0 0, 100% 0, 100% calc(100% - 52px), 0 calc(100% - 32px));
+    --banner-clip: polygon(
+      0 0,
+      100% 0,
+      100% calc(100% - 52px),
+      0 calc(100% - 32px)
+    );
   }
 
   .hero {
@@ -156,7 +161,7 @@
 
   .article-reader {
     width: 100%;
-    padding: 0 1.0rem;
+    padding: 0 1rem;
     box-sizing: border-box;
   }
 
diff --git a/src/templates/learn.tsx b/src/templates/learn.tsx
index 5a0258a579..aff1a9c1b7 100644
--- a/src/templates/learn.tsx
+++ b/src/templates/learn.tsx
@@ -1,17 +1,15 @@
 import { graphql } from 'gatsby';
 import React from 'react';
 import Article from '../components/article';
-import Hero from '../components/hero';
 import Layout from '../components/layout';
 import Navigation from '../components/navigation';
 import { LearnPageContext, LearnPageData } from '../types';
 
-type Props = {
+interface Props {
   data: LearnPageData;
   pageContext: LearnPageContext;
-};
-
-export default ({
+}
+const LearnLayout = ({
   data: {
     doc: {
       frontmatter: { title, description },
@@ -21,22 +19,21 @@ export default ({
     },
   },
   pageContext: { slug, next, previous, relativePath, navigationData },
-}: Props) => {
-  return (
-    <Layout title={title} description={description}>
-      <Navigation currentSlug={slug} sections={navigationData} />
-      <Article
-        title={title}
-        html={html}
-        tableOfContents={tableOfContents}
-        next={next}
-        authors={authors}
-        previous={previous}
-        relativePath={relativePath}
-      />
-    </Layout>
-  );
-};
+}: Props): React.ReactNode => (
+  <Layout title={title} description={description}>
+    <Navigation currentSlug={slug} sections={navigationData} />
+    <Article
+      title={title}
+      html={html}
+      tableOfContents={tableOfContents}
+      next={next}
+      authors={authors}
+      previous={previous}
+      relativePath={relativePath}
+    />
+  </Layout>
+);
+export default LearnLayout;
 
 export const query = graphql`
   query DocBySlug($slug: String!) {
diff --git a/src/util/createSlug.js b/src/util/createSlug.js
index ab3f525f04..4a8500b01f 100644
--- a/src/util/createSlug.js
+++ b/src/util/createSlug.js
@@ -11,11 +11,14 @@ function createSlug(title) {
     slug = slug.replace(set.from, set.to);
   });
 
-  return slug
-    .replace(/[^\w\-]+/g, '') // Remove any non word characters
-    .replace(/--+/g, '-') // Replace multiple hyphens with single
-    .replace(/^-/, '') // Remove any leading hyphen
-    .replace(/-$/, ''); // Remove any trailing hyphen
+  return (
+    slug
+      // eslint-disable-next-line no-useless-escape
+      .replace(/[^\w\-]+/g, '') // Remove any non word characters
+      .replace(/--+/g, '-') // Replace multiple hyphens with single
+      .replace(/^-/, '') // Remove any leading hyphen
+      .replace(/-$/, '')
+  ); // Remove any trailing hyphen
 }
 
 module.exports = createSlug;
diff --git a/src/util/isScreenWithinWidth.ts b/src/util/isScreenWithinWidth.ts
index 86ea88a43b..ec3a9f2f5f 100644
--- a/src/util/isScreenWithinWidth.ts
+++ b/src/util/isScreenWithinWidth.ts
@@ -2,9 +2,9 @@
  *  If the width of the viewport is lesser than this value
  *  it means that the website is viewed in a tablet or mobile
  */
-const MAX_SMALL_SCREEN_WIDTH: number = 1262;
+const MAX_SMALL_SCREEN_WIDTH = 1262;
 
-const MAX_MOBILE_SCREEN_WIDTH: number = 720;
+const MAX_MOBILE_SCREEN_WIDTH = 720;
 
 const isScreenWithinWidth = (maxWidth: number): boolean => {
   // Get viewport width
@@ -17,7 +17,8 @@ const isScreenWithinWidth = (maxWidth: number): boolean => {
   return w <= maxWidth;
 };
 
-export const isSmallScreen = () => isScreenWithinWidth(MAX_SMALL_SCREEN_WIDTH);
+export const isSmallScreen = (): boolean =>
+  isScreenWithinWidth(MAX_SMALL_SCREEN_WIDTH);
 
-export const isMobileScreen = () =>
+export const isMobileScreen = (): boolean =>
   isScreenWithinWidth(MAX_MOBILE_SCREEN_WIDTH);
diff --git a/src/util/notifyWhenStickyHeadersChange.ts b/src/util/notifyWhenStickyHeadersChange.ts
deleted file mode 100644
index d3bf6d44bd..0000000000
--- a/src/util/notifyWhenStickyHeadersChange.ts
+++ /dev/null
@@ -1,178 +0,0 @@
-import { StickyChange, SentinelObserverSetupOptions } from '../types';
-
-/**
- * Dispatches a `stickychange` custom event.
- */
-const fireStickyChange = (stuck: boolean, target: HTMLElement): void => {
-  const detail: StickyChange = { stuck, target };
-  const event: CustomEvent<StickyChange> = new CustomEvent('stickychange', {
-    detail,
-  });
-  document.dispatchEvent(event);
-};
-
-/**
- * Adds DOM nodes (aka sentinels) in each sticky section to act as waypoints for
- * figuring out scroll position.
- */
-const addSentinels = (
-  container: HTMLElement,
-  stickyElementsClassName: string,
-  className: string
-): HTMLDivElement[] => {
-  const stickyElements: HTMLElement[] = Array.from(
-    container.querySelectorAll(`.${stickyElementsClassName}`)
-  ) as HTMLElement[];
-  const sentinels: HTMLDivElement[] = stickyElements.map(
-    (stickyElement: HTMLElement) => {
-      const sentinel: HTMLDivElement = document.createElement('div');
-      sentinel.classList.add('sticky-sentinel', className);
-      const appendedSentinel: HTMLDivElement = stickyElement.parentElement!.appendChild(
-        sentinel
-      );
-
-      return appendedSentinel;
-    }
-  );
-
-  return sentinels;
-};
-
-/**
- * Sets up an intersection observer to notify when elements with the class
- * `.sticky-sentinel--top` become visible/invisible at the top of the container.
- */
-const observeTopSentinels = ({
-  container,
-  stickyElementsClassName,
-  root = container,
-  headerRootMargin,
-}: SentinelObserverSetupOptions): void => {
-  const callback: IntersectionObserverCallback = (
-    entries: IntersectionObserverEntry[]
-  ) => {
-    entries.forEach((entry: IntersectionObserverEntry) => {
-      const targetBoundsInfo: ClientRect = entry.boundingClientRect;
-      const targetParentElement: HTMLElement | null =
-        entry.target.parentElement;
-      const stickyElement: HTMLElement | null =
-        targetParentElement &&
-        (targetParentElement.querySelector(
-          `.${stickyElementsClassName}`
-        ) as HTMLElement);
-      const rootBoundsInfo: ClientRect = entry.rootBounds;
-
-      // Started sticking
-      if (stickyElement && targetBoundsInfo.bottom < rootBoundsInfo.top) {
-        fireStickyChange(true, stickyElement);
-      }
-
-      // Stopped sticking
-      if (
-        stickyElement &&
-        targetBoundsInfo.bottom >= rootBoundsInfo.top &&
-        targetBoundsInfo.bottom < rootBoundsInfo.bottom
-      ) {
-        fireStickyChange(false, stickyElement);
-      }
-    });
-  };
-  const options: IntersectionObserverInit = {
-    root,
-    rootMargin: headerRootMargin || '0px',
-    threshold: [0],
-  };
-  const observer: IntersectionObserver = new IntersectionObserver(
-    callback,
-    options
-  );
-
-  // Add the top sentinels to each section and attach an observer
-  const topSentinels: HTMLDivElement[] = addSentinels(
-    container,
-    stickyElementsClassName,
-    'sticky-sentinel--top'
-  );
-  topSentinels.forEach((sentinel: HTMLDivElement) =>
-    observer.observe(sentinel)
-  );
-};
-
-/**
- * Sets up an intersection observer to notify when elements with the class
- * `.sticky-sentinel--bottom` become visible/invisible at the bottom of the
- * container.
- */
-const observeBottomSentinels = ({
-  container,
-  stickyElementsClassName,
-  root = container,
-  footerRootMargin,
-}: SentinelObserverSetupOptions): void => {
-  const callback: IntersectionObserverCallback = (
-    entries: IntersectionObserverEntry[]
-  ) => {
-    entries.forEach((entry: IntersectionObserverEntry) => {
-      const targetBoundsInfo: ClientRect = entry.boundingClientRect;
-      const targetParentElement: HTMLElement | null =
-        entry.target.parentElement;
-      const stickyElement: HTMLElement | null =
-        targetParentElement &&
-        (targetParentElement.querySelector(
-          `.${stickyElementsClassName}`
-        ) as HTMLElement);
-      const rootBoundsInfo: ClientRect = entry.rootBounds;
-      const ratio: number = entry.intersectionRatio;
-
-      // Started sticking
-      if (
-        stickyElement &&
-        targetBoundsInfo.bottom > rootBoundsInfo.top &&
-        ratio === 1
-      ) {
-        fireStickyChange(true, stickyElement);
-      }
-
-      // Stopped sticking
-      if (
-        stickyElement &&
-        targetBoundsInfo.top < rootBoundsInfo.top &&
-        targetBoundsInfo.bottom < rootBoundsInfo.bottom
-      ) {
-        fireStickyChange(false, stickyElement);
-      }
-    });
-  };
-  const options: IntersectionObserverInit = {
-    root,
-    rootMargin: footerRootMargin || '0px',
-    // Get callback slightly before element is 100% visible/invisible
-    threshold: [1],
-  };
-  const observer: IntersectionObserver = new IntersectionObserver(
-    callback,
-    options
-  );
-
-  // Add the bottom sentinels to each section and attach an observer
-  const bottomSentinels: HTMLDivElement[] = addSentinels(
-    container,
-    stickyElementsClassName,
-    'sticky-sentinel--bottom'
-  );
-  bottomSentinels.forEach((sentinel: HTMLDivElement) =>
-    observer.observe(sentinel)
-  );
-};
-
-/**
- * Notifies when elements that have the class `stickyElementsClassName`
- * (specified in `setupOptions`) begin to stick or not.
- * Note: these should be children of the `container` element.
- */
-export const notifyWhenStickyHeadersChange = (
-  setupOptions: SentinelObserverSetupOptions
-): void => {
-  observeTopSentinels(setupOptions);
-  observeBottomSentinels(setupOptions);
-};
diff --git a/src/util/outlineOnKeyboardNav.ts b/src/util/outlineOnKeyboardNav.ts
index 9662f5cc8c..2d298637b4 100644
--- a/src/util/outlineOnKeyboardNav.ts
+++ b/src/util/outlineOnKeyboardNav.ts
@@ -7,11 +7,32 @@ const MOUSEDOWN_EVENT = 'mousedown';
 
 let IS_MOUSE_EVENT = false;
 
+export function handleKeyDown(event: KeyboardEvent): void {
+  if (event.keyCode === TAB_KEYCODE) {
+    IS_MOUSE_EVENT = false;
+  }
+}
+
+export function handleMouseDown(): void {
+  IS_MOUSE_EVENT = true;
+}
+
+export function handleFocus(event: Event): void {
+  if (IS_MOUSE_EVENT && event.target && event.target !== event.currentTarget) {
+    (event.target as Element).setAttribute(FOCUS_ATTR, 'true');
+  }
+}
+
+export function handleBlur(event: Event): void {
+  if (event.target !== event.currentTarget) {
+    (event.target as Element).removeAttribute(FOCUS_ATTR);
+  }
+}
 /**
  * Attaches listeners for keydown, mousedown, focus, and blur to the document,
  * which handle adding or removing focus outline css class for mouse events.
  */
-export function addFocusOutlineListeners() {
+export function addFocusOutlineListeners(): void {
   const docEl = window.document.documentElement;
   IS_MOUSE_EVENT = false;
 
@@ -24,7 +45,7 @@ export function addFocusOutlineListeners() {
 /**
  * Detaches listeners
  */
-export function removeFocusOutlineListeners() {
+export function removeFocusOutlineListeners(): void {
   const docEl = window.document.documentElement;
 
   if (docEl) {
@@ -34,25 +55,3 @@ export function removeFocusOutlineListeners() {
     docEl.removeEventListener(BLUR_EVENT, handleBlur, true);
   }
 }
-
-export function handleKeyDown(event: KeyboardEvent) {
-  if (event.keyCode === TAB_KEYCODE) {
-    IS_MOUSE_EVENT = false;
-  }
-}
-
-export function handleMouseDown(event: MouseEvent) {
-  IS_MOUSE_EVENT = true;
-}
-
-export function handleFocus(event: Event) {
-  if (IS_MOUSE_EVENT && event.target && event.target !== event.currentTarget) {
-    (event.target as Element).setAttribute(FOCUS_ATTR, 'true');
-  }
-}
-
-export function handleBlur(event: Event) {
-  if (event.target !== event.currentTarget) {
-    (event.target as Element).removeAttribute(FOCUS_ATTR);
-  }
-}
diff --git a/src/util/scrollTo.tsx b/src/util/scrollTo.tsx
index 045aa80572..89e554f369 100644
--- a/src/util/scrollTo.tsx
+++ b/src/util/scrollTo.tsx
@@ -1,12 +1,15 @@
 import { isMobileScreen } from './isScreenWithinWidth';
 
+/* eslint-disable */
+// this is from stack overflow I assume
 const easeInOutCubic = (t: number, b: number, c: number, d: number) =>
   (t /= d / 2) < 1
     ? (c / 2) * t * t * t + b
     : (c / 2) * ((t -= 2) * t * t + 2) + b;
+/* eslint-enable */
 
 export function scrollTo(
-  scrollTo: number,
+  scrollToPoint: number,
   element: HTMLElement | null = null,
   duration: number = 333
 ): Promise<boolean> {
@@ -15,12 +18,12 @@ export function scrollTo(
       window.pageYOffset ||
       document.documentElement.scrollTop) -
     ((element && element.clientTop) || 0);
-  const change = scrollTo - start;
+  const change = scrollToPoint - start;
   let previousTime = window.performance.now();
   let currentTime = 0;
 
-  return new Promise((resolve, _reject) => {
-    const animateScroll = () => {
+  return new Promise<boolean>((resolve): void => {
+    const animateScroll = (): void => {
       const time = window.performance.now();
       const increment = time - previousTime;
       previousTime = time;
@@ -41,10 +44,16 @@ export function scrollTo(
 const SPEED_MODIFIER = 0.9;
 const BASE_TIME = 500;
 
+interface ScrollParams {
+  newScrollPos: number;
+  scrollWindow: null | HTMLElement;
+  scrollTime: number;
+}
+
 export const calcNavScrollParams = (
   linkHeight: number,
   navElement: HTMLElement
-) => {
+): ScrollParams => {
   const navRect = navElement.getBoundingClientRect();
   let newScrollPos: number;
   let scrollWindow: HTMLElement | null;
diff --git a/src/util/tocFormatter.ts b/src/util/tocFormatter.ts
index 422b1b36aa..aa28f4e6da 100644
--- a/src/util/tocFormatter.ts
+++ b/src/util/tocFormatter.ts
@@ -1,5 +1,5 @@
 // See related issue: https://github.com/gatsbyjs/gatsby/issues/8982
-export function fixTocCodeTag(tocLinks: string = '') {
+export function fixTocCodeTag(tocLinks: string = ''): string {
   const lessThanSignRegex = /&#x3C;/gi;
 
   return tocLinks.replace(lessThanSignRegex, '<');
diff --git a/test-setup.js b/test-setup.js
index 530bd30b3c..d08bba40ab 100644
--- a/test-setup.js
+++ b/test-setup.js
@@ -1,3 +1,4 @@
+// eslint-disable-next-line no-underscore-dangle
 global.___loader = {
   enqueue: jest.fn(),
 };
diff --git a/test/__mocks__/gatsby.js b/test/__mocks__/gatsby.js
index b6535f1ab5..ee36affb2b 100644
--- a/test/__mocks__/gatsby.js
+++ b/test/__mocks__/gatsby.js
@@ -1,14 +1,13 @@
 const React = require('react');
+
 const gatsby = jest.requireActual('gatsby');
 
 module.exports = {
   ...gatsby,
   graphql: jest.fn(),
-  Link: jest.fn().mockImplementation(({ to, ...rest }) =>
-    React.createElement('a', {
+  Link: jest.fn().mockImplementation(({ to, ...rest }) => React.createElement('a', {
       ...rest,
       href: to,
-    })
-  ),
+    })),
   StaticQuery: jest.fn(),
 };
diff --git a/test/util/outlineOnKeyboardNav.test.js b/test/util/outlineOnKeyboardNav.test.js
index 55fe031537..d37f00eb99 100644
--- a/test/util/outlineOnKeyboardNav.test.js
+++ b/test/util/outlineOnKeyboardNav.test.js
@@ -4,6 +4,7 @@ import {
   handleKeyDown,
   handleBlur,
 } from '../../src/util/outlineOnKeyboardNav';
+
 describe('Tests for focus and blur handlers', () => {
   const FOCUS_ATTR = 'data-is-focused';
   const TAB_KEYCODE = 9;
diff --git a/tslint.json b/tslint.json
deleted file mode 100644
index 10e7dfce13..0000000000
--- a/tslint.json
+++ /dev/null
@@ -1,83 +0,0 @@
-{
-  "extends": ["tslint-react", "tslint-config-prettier"],
-  "jsRules": {
-    "no-empty": true
-  },
-  "rules": {
-    "array-type": [true, "array"],
-    "arrow-return-shorthand": true,
-    "ban": false,
-    "class-name": true,
-    "comment-format": [true, "check-space"],
-    "curly": true,
-    "eofline": false,
-    "forin": true,
-    "import-blacklist": [true, "lodash-es"],
-    "indent": [true, "spaces"],
-    "interface-name": [true, "never-prefix"],
-    "jsdoc-format": true,
-    "jsx-boolean-value": [true, "never"],
-    "jsx-no-lambda": false,
-    "jsx-no-multiline-js": false,
-    "label-position": true,
-    "newline-before-return": true,
-    "no-any": true,
-    "no-arg": true,
-    "no-bitwise": true,
-    "no-console": [
-      true,
-      "log",
-      "error",
-      "debug",
-      "info",
-      "time",
-      "timeEnd",
-      "trace"
-    ],
-    "no-consecutive-blank-lines": true,
-    "no-construct": true,
-    "no-debugger": true,
-    "no-duplicate-variable": true,
-    "no-empty": true,
-    "no-eval": true,
-    "no-implicit-dependencies": [true, "dev"],
-    "no-string-literal": true,
-    "no-switch-case-fall-through": true,
-    "no-trailing-whitespace": false,
-    "no-unnecessary-callback-wrapper": true,
-    "no-unused-expression": true,
-    "one-line": [
-      true,
-      "check-catch",
-      "check-else",
-      "check-open-brace",
-      "check-whitespace"
-    ],
-    "prefer-const": true,
-    "quotemark": [true, "single", "jsx-double"],
-    "radix": true,
-    "switch-default": true,
-    "triple-equals": [true, "allow-null-check"],
-    "typedef": [true, "parameter", "property-declaration"],
-    "typedef-whitespace": [
-      true,
-      {
-        "call-signature": "nospace",
-        "index-signature": "nospace",
-        "parameter": "nospace",
-        "property-declaration": "nospace",
-        "variable-declaration": "nospace"
-      }
-    ],
-    "whitespace": [
-      true,
-      "check-branch",
-      "check-decl",
-      "check-module",
-      "check-operator",
-      "check-separator",
-      "check-type",
-      "check-typecast"
-    ]
-  }
-}
diff --git a/yarn.lock b/yarn.lock
index c39019691e..0bb15d886d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1665,6 +1665,11 @@
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.3.tgz#bdfd69d61e464dcc81b25159c270d75a73c1a636"
   integrity sha512-Il2DtDVRGDcqjDtE+rF8iqg1CArehSK84HZJCT7AMITlyXRBpuPhqGLDQMowraqqu1coEaimg4ZOqggt6L6L+A==
 
+"@types/json5@^0.0.29":
+  version "0.0.29"
+  resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.29.tgz#ee28707ae94e11d2b827bcbe5270bcea7f3e71ee"
+  integrity sha1-7ihweulOEdK4J7y+UnC86n8+ce4=
+
 "@types/minimatch@*":
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.3.tgz#3dca0e3f33b200fc7d1139c0cd96c1268cadfd9d"
@@ -1774,7 +1779,7 @@
   dependencies:
     "@types/yargs-parser" "*"
 
-"@typescript-eslint/eslint-plugin@^1.13.0":
+"@typescript-eslint/eslint-plugin@^1.13.0", "@typescript-eslint/eslint-plugin@^1.4.2":
   version "1.13.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-1.13.0.tgz#22fed9b16ddfeb402fd7bcde56307820f6ebc49f"
   integrity sha512-WQHCozMnuNADiqMtsNzp96FNox5sOVpU8Xt4meaT4em8lOG1SrOv92/mUbEHQVh90sldKSfcOc/I0FOb/14G1g==
@@ -1785,7 +1790,7 @@
     regexpp "^2.0.1"
     tsutils "^3.7.0"
 
-"@typescript-eslint/experimental-utils@1.13.0":
+"@typescript-eslint/experimental-utils@1.13.0", "@typescript-eslint/experimental-utils@^1.13.0":
   version "1.13.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-1.13.0.tgz#b08c60d780c0067de2fb44b04b432f540138301e"
   integrity sha512-zmpS6SyqG4ZF64ffaJ6uah6tWWWgZ8m+c54XXgwFtUv0jNz8aJAVx8chMCvnk7yl6xwn8d+d96+tWp7fXzTuDg==
@@ -3113,11 +3118,6 @@ buffer@^5.2.0, buffer@^5.2.1:
     base64-js "^1.0.2"
     ieee754 "^1.1.4"
 
-builtin-modules@^1.1.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-1.1.1.tgz#270f076c5a72c02f5b65a47df94c5fe3a278892f"
-  integrity sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=
-
 builtin-modules@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-3.1.0.tgz#aad97c15131eb76b65b50ef208e7584cd76a7484"
@@ -3336,7 +3336,7 @@ chalk@2.3.1:
     escape-string-regexp "^1.0.5"
     supports-color "^5.2.0"
 
-chalk@2.4.2, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.0, chalk@^2.4.1, chalk@^2.4.2:
+chalk@2.4.2, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.4.1, chalk@^2.4.2:
   version "2.4.2"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.2.tgz#cd42541677a54333cf541a49108c1432b44c9424"
   integrity sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==
@@ -3665,7 +3665,7 @@ command-exists@^1.2.2:
   resolved "https://registry.yarnpkg.com/command-exists/-/command-exists-1.2.8.tgz#715acefdd1223b9c9b37110a149c6392c2852291"
   integrity sha512-PM54PkseWbiiD/mMsbvW351/u+dafwTJ0ye2qB60G1aGQP9j3xK2gmMDc+R34L3nDtx4qMCitXT75mkbkGJDLw==
 
-commander@^2.11.0, commander@^2.12.1, commander@^2.20.0, commander@~2.20.0:
+commander@^2.11.0, commander@^2.20.0, commander@~2.20.0:
   version "2.20.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
   integrity sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==
@@ -3782,7 +3782,7 @@ configstore@^5.0.0:
     write-file-atomic "^3.0.0"
     xdg-basedir "^4.0.0"
 
-confusing-browser-globals@^1.0.7:
+confusing-browser-globals@^1.0.5, confusing-browser-globals@^1.0.7:
   version "1.0.8"
   resolved "https://registry.yarnpkg.com/confusing-browser-globals/-/confusing-browser-globals-1.0.8.tgz#93ffec1f82a6e2bf2bc36769cc3a92fa20e502f3"
   integrity sha512-lI7asCibVJ6Qd3FGU7mu4sfG4try4LX3+GVS+Gv8UlrEf2AeW57piecapnog2UHZSbcX/P/1UDWVaTsblowlZg==
@@ -4448,6 +4448,11 @@ deep-is@~0.1.3:
   resolved "https://registry.yarnpkg.com/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"
   integrity sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=
 
+deepmerge@^2.0.1:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-2.2.1.tgz#5d3ff22a01c00f645405a2fbc17d0778a1801170"
+  integrity sha512-R9hc1Xa/NOBi9WRVUWg19rl1UB7Tt4kuPd+thNJgFZoxXsTz7ncaPaeIm+40oSGuP33DfMb4sZt1QIGiJzC4EA==
+
 deepmerge@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-4.0.0.tgz#3e3110ca29205f120d7cb064960a39c3d2087c09"
@@ -4620,11 +4625,6 @@ diff-sequences@^24.9.0:
   resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-24.9.0.tgz#5715d6244e2aa65f48bba0bc972db0b0b11e95b5"
   integrity sha512-Dj6Wk3tWyTE+Fo1rW8v0Xhwk80um6yFYKbuAxc9c3EZxIHFDYwbi34Uk42u1CdnIiVorvt4RmlSDjIPyzGC2ew==
 
-diff@^3.2.0:
-  version "3.5.0"
-  resolved "https://registry.yarnpkg.com/diff/-/diff-3.5.0.tgz#800c0dd1e0a8bfbc95835c202ad220fe317e5a12"
-  integrity sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==
-
 diffie-hellman@^5.0.0:
   version "5.0.3"
   resolved "https://registry.yarnpkg.com/diffie-hellman/-/diffie-hellman-5.0.3.tgz#40e8ee98f55a2149607146921c63e1ae5f3d2875"
@@ -5094,6 +5094,31 @@ escodegen@^1.9.1:
   optionalDependencies:
     source-map "~0.6.1"
 
+eslint-config-airbnb-base@^13.2.0:
+  version "13.2.0"
+  resolved "https://registry.yarnpkg.com/eslint-config-airbnb-base/-/eslint-config-airbnb-base-13.2.0.tgz#f6ea81459ff4dec2dda200c35f1d8f7419d57943"
+  integrity sha512-1mg/7eoB4AUeB0X1c/ho4vb2gYkNH8Trr/EgCT/aGmKhhG+F6vF5s8+iRBlWAzFIAphxIdp3YfEKgEl0f9Xg+w==
+  dependencies:
+    confusing-browser-globals "^1.0.5"
+    object.assign "^4.1.0"
+    object.entries "^1.1.0"
+
+eslint-config-airbnb@^17.1.0:
+  version "17.1.1"
+  resolved "https://registry.yarnpkg.com/eslint-config-airbnb/-/eslint-config-airbnb-17.1.1.tgz#2272e0b86bb1e2b138cdf88d07a3b6f4cda3d626"
+  integrity sha512-xCu//8a/aWqagKljt+1/qAM62BYZeNq04HmdevG5yUGWpja0I/xhqd6GdLRch5oetEGFiJAnvtGuTEAese53Qg==
+  dependencies:
+    eslint-config-airbnb-base "^13.2.0"
+    object.assign "^4.1.0"
+    object.entries "^1.1.0"
+
+eslint-config-prettier@^4.1.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/eslint-config-prettier/-/eslint-config-prettier-4.3.0.tgz#c55c1fcac8ce4518aeb77906984e134d9eb5a4f0"
+  integrity sha512-sZwhSTHVVz78+kYD3t5pCWSYEdVSBR0PXnwjDRsUs8ytIrK8PLXw+6FKp8r3Z7rx4ZszdetWlXYKOHoUrrwPlA==
+  dependencies:
+    get-stdin "^6.0.0"
+
 eslint-config-react-app@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/eslint-config-react-app/-/eslint-config-react-app-4.0.1.tgz#23fd0fd7ea89442ef1e733f66a7207674b23c8db"
@@ -5109,6 +5134,15 @@ eslint-import-resolver-node@^0.3.2:
     debug "^2.6.9"
     resolve "^1.5.0"
 
+eslint-import-resolver-typescript@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/eslint-import-resolver-typescript/-/eslint-import-resolver-typescript-1.1.1.tgz#e6d42172b95144ef16610fe104ef38340edea591"
+  integrity sha512-jqSfumQ+H5y3FUJ6NjRkbOQSUOlbBucGTN3ELymOtcDBbPjVdm/luvJuCfCaIXGh8sEF26ma1qVdtDgl9ndhUg==
+  dependencies:
+    debug "^4.0.1"
+    resolve "^1.4.0"
+    tsconfig-paths "^3.6.0"
+
 eslint-loader@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/eslint-loader/-/eslint-loader-2.2.1.tgz#28b9c12da54057af0845e2a6112701a2f6bf8337"
@@ -5143,7 +5177,7 @@ eslint-plugin-graphql@^3.0.3:
     graphql-config "^2.0.1"
     lodash "^4.11.1"
 
-eslint-plugin-import@^2.18.2:
+eslint-plugin-import@^2.16.0, eslint-plugin-import@^2.18.2:
   version "2.18.2"
   resolved "https://registry.yarnpkg.com/eslint-plugin-import/-/eslint-plugin-import-2.18.2.tgz#02f1180b90b077b33d447a17a2326ceb400aceb6"
   integrity sha512-5ohpsHAiUBRNaBWAF08izwUGlbrJoJJ+W9/TBwsGoR1MnlgfwMIKrFeSjWbt6moabiXW9xNvtFz+97KHRfI4HQ==
@@ -5160,7 +5194,14 @@ eslint-plugin-import@^2.18.2:
     read-pkg-up "^2.0.0"
     resolve "^1.11.0"
 
-eslint-plugin-jsx-a11y@^6.2.3:
+eslint-plugin-jest@^22.17.0:
+  version "22.17.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-jest/-/eslint-plugin-jest-22.17.0.tgz#dc170ec8369cd1bff9c5dd8589344e3f73c88cf6"
+  integrity sha512-WT4DP4RoGBhIQjv+5D0FM20fAdAUstfYAf/mkufLNTojsfgzc5/IYW22cIg/Q4QBavAZsROQlqppiWDpFZDS8Q==
+  dependencies:
+    "@typescript-eslint/experimental-utils" "^1.13.0"
+
+eslint-plugin-jsx-a11y@^6.2.1, eslint-plugin-jsx-a11y@^6.2.3:
   version "6.2.3"
   resolved "https://registry.yarnpkg.com/eslint-plugin-jsx-a11y/-/eslint-plugin-jsx-a11y-6.2.3.tgz#b872a09d5de51af70a97db1eea7dc933043708aa"
   integrity sha512-CawzfGt9w83tyuVekn0GDPU9ytYtxyxyFZ3aSWROmnRRFQFT2BiPJd7jvRdzNDi6oLWaS2asMeYSNMjWTV4eNg==
@@ -5175,12 +5216,19 @@ eslint-plugin-jsx-a11y@^6.2.3:
     has "^1.0.3"
     jsx-ast-utils "^2.2.1"
 
-eslint-plugin-react-hooks@^1.7.0:
+eslint-plugin-prettier@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-prettier/-/eslint-plugin-prettier-3.1.0.tgz#8695188f95daa93b0dc54b249347ca3b79c4686d"
+  integrity sha512-XWX2yVuwVNLOUhQijAkXz+rMPPoCr7WFiAl8ig6I7Xn+pPVhDhzg4DxHpmbeb0iqjO9UronEA3Tb09ChnFVHHA==
+  dependencies:
+    prettier-linter-helpers "^1.0.0"
+
+eslint-plugin-react-hooks@^1.4.0, eslint-plugin-react-hooks@^1.7.0:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/eslint-plugin-react-hooks/-/eslint-plugin-react-hooks-1.7.0.tgz#6210b6d5a37205f0b92858f895a4e827020a7d04"
   integrity sha512-iXTCFcOmlWvw4+TOE8CLWj6yX1GwzT0Y6cUfHHZqWnSk144VmVIRcVGtUAzrLES7C798lmvnt02C7rxaOX1HNA==
 
-eslint-plugin-react@^7.14.3:
+eslint-plugin-react@^7.12.4, eslint-plugin-react@^7.14.3:
   version "7.14.3"
   resolved "https://registry.yarnpkg.com/eslint-plugin-react/-/eslint-plugin-react-7.14.3.tgz#911030dd7e98ba49e1b2208599571846a66bdf13"
   integrity sha512-EzdyyBWC4Uz2hPYBiEJrKCUi2Fn+BJ9B/pJQcjw5X+x/H2Nm59S4MJIvL4O5NEE0+WbnQwEBxWY03oUk+Bc3FA==
@@ -5215,7 +5263,7 @@ eslint-visitor-keys@^1.0.0:
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.1.0.tgz#e2a82cea84ff246ad6fb57f9bde5b46621459ec2"
   integrity sha512-8y9YjtM1JBJU/A9Kc+SbaOV4y29sSWckBwMHa+FGtVj5gN/sbnKDf6xJUl+8g7FAij9LVaP8C24DUiH/f/2Z9A==
 
-eslint@^5.16.0:
+eslint@^5.14.1, eslint@^5.16.0:
   version "5.16.0"
   resolved "https://registry.yarnpkg.com/eslint/-/eslint-5.16.0.tgz#a1e3ac1aae4a3fbd8296fcf8f7ab7314cbb6abea"
   integrity sha512-S3Rz11i7c8AA5JPv7xAH+dOyq/Cu/VXHiHXBPOU1k/JAM5dXqQPt3qcrhpHSorXmrpu2g0gkIBVXAqCpzfoZIg==
@@ -5597,6 +5645,11 @@ fast-deep-equal@^2.0.1:
   resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz#7b05218ddf9667bf7f370bf7fdb2cb15fdd0aa49"
   integrity sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=
 
+fast-diff@^1.1.2:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/fast-diff/-/fast-diff-1.2.0.tgz#73ee11982d86caaf7959828d519cfe927fac5f03"
+  integrity sha512-xJuoT5+L99XlZ8twedaRf6Ax2TgQVxvgZOYoPKqZufmJib0tL2tegPBOZb1pVNgIhlqDlA0eO0c3wBvQcmzx4w==
+
 fast-glob@^2.0.2, fast-glob@^2.2.2:
   version "2.2.7"
   resolved "https://registry.yarnpkg.com/fast-glob/-/fast-glob-2.2.7.tgz#6953857c3afa475fff92ee6015d52da70a4cd39d"
@@ -11273,6 +11326,13 @@ prepend-http@^2.0.0:
   resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-2.0.0.tgz#e92434bfa5ea8c19f41cdfd401d741a3c819d897"
   integrity sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc=
 
+prettier-linter-helpers@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/prettier-linter-helpers/-/prettier-linter-helpers-1.0.0.tgz#d23d41fe1375646de2d0104d3454a3008802cf7b"
+  integrity sha512-GbK2cP9nraSSUF9N2XwUwqfzlAFlMNYYl+ShE/V+H8a9uNl/oUqB1w2EL54Jh0OlyRSd8RfWYJ3coVS4TROP2w==
+  dependencies:
+    fast-diff "^1.1.2"
+
 prettier@^1.16.4:
   version "1.18.2"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.18.2.tgz#6823e7c5900017b4bd3acf46fe9ac4b4d7bda9ea"
@@ -12228,7 +12288,7 @@ resolve@1.1.7:
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.1.7.tgz#203114d82ad2c5ed9e8e0411b3932875e889e97b"
   integrity sha1-IDEU2CrSxe2ejgQRs5ModeiJ6Xs=
 
-resolve@^1.10.0, resolve@^1.10.1, resolve@^1.11.0, resolve@^1.12.0, resolve@^1.3.2, resolve@^1.5.0, resolve@^1.8.1:
+resolve@^1.10.0, resolve@^1.10.1, resolve@^1.11.0, resolve@^1.12.0, resolve@^1.3.2, resolve@^1.4.0, resolve@^1.5.0, resolve@^1.8.1:
   version "1.12.0"
   resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.12.0.tgz#3fc644a35c84a48554609ff26ec52b66fa577df6"
   integrity sha512-B/dOmuoAik5bKcD6s6nXDCjzUKnaDvdkRyAk6rsmsKLipWj4797iothd7jmmUhWTfinVMU+wc56rYKsit2Qy4w==
@@ -13744,49 +13804,22 @@ ts-pnp@^1.1.2:
   resolved "https://registry.yarnpkg.com/ts-pnp/-/ts-pnp-1.1.2.tgz#be8e4bfce5d00f0f58e0666a82260c34a57af552"
   integrity sha512-f5Knjh7XCyRIzoC/z1Su1yLLRrPrFCgtUAh/9fCSP6NKbATwpOL1+idQVXQokK9GRFURn/jYPGPfegIctwunoA==
 
-tslib@^1.6.0, tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0:
+tsconfig-paths@^3.6.0:
+  version "3.8.0"
+  resolved "https://registry.yarnpkg.com/tsconfig-paths/-/tsconfig-paths-3.8.0.tgz#4e34202d5b41958f269cf56b01ed95b853d59f72"
+  integrity sha512-zZEYFo4sjORK8W58ENkRn9s+HmQFkkwydDG7My5s/fnfr2YYCaiyXe/HBUcIgU8epEKOXwiahOO+KZYjiXlWyQ==
+  dependencies:
+    "@types/json5" "^0.0.29"
+    deepmerge "^2.0.1"
+    json5 "^1.0.1"
+    minimist "^1.2.0"
+    strip-bom "^3.0.0"
+
+tslib@^1.6.0, tslib@^1.8.1, tslib@^1.9.0:
   version "1.10.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.10.0.tgz#c3c19f95973fb0a62973fb09d90d961ee43e5c8a"
   integrity sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==
 
-tslint-config-prettier@^1.15.0:
-  version "1.18.0"
-  resolved "https://registry.yarnpkg.com/tslint-config-prettier/-/tslint-config-prettier-1.18.0.tgz#75f140bde947d35d8f0d238e0ebf809d64592c37"
-  integrity sha512-xPw9PgNPLG3iKRxmK7DWr+Ea/SzrvfHtjFt5LBl61gk2UBG/DB9kCXRjv+xyIU1rUtnayLeMUVJBcMX8Z17nDg==
-
-tslint-react@^3.6.0:
-  version "3.6.0"
-  resolved "https://registry.yarnpkg.com/tslint-react/-/tslint-react-3.6.0.tgz#7f462c95c4a0afaae82507f06517ff02942196a1"
-  integrity sha512-AIv1QcsSnj7e9pFir6cJ6vIncTqxfqeFF3Lzh8SuuBljueYzEAtByuB6zMaD27BL0xhMEqsZ9s5eHuCONydjBw==
-  dependencies:
-    tsutils "^2.13.1"
-
-tslint@^5.11.0:
-  version "5.19.0"
-  resolved "https://registry.yarnpkg.com/tslint/-/tslint-5.19.0.tgz#a2cbd4a7699386da823f6b499b8394d6c47bb968"
-  integrity sha512-1LwwtBxfRJZnUvoS9c0uj8XQtAnyhWr9KlNvDIdB+oXyT+VpsOAaEhEgKi1HrZ8rq0ki/AAnbGSv4KM6/AfVZw==
-  dependencies:
-    "@babel/code-frame" "^7.0.0"
-    builtin-modules "^1.1.1"
-    chalk "^2.3.0"
-    commander "^2.12.1"
-    diff "^3.2.0"
-    glob "^7.1.1"
-    js-yaml "^3.13.1"
-    minimatch "^3.0.4"
-    mkdirp "^0.5.1"
-    resolve "^1.3.2"
-    semver "^5.3.0"
-    tslib "^1.8.0"
-    tsutils "^2.29.0"
-
-tsutils@^2.13.1, tsutils@^2.29.0:
-  version "2.29.0"
-  resolved "https://registry.yarnpkg.com/tsutils/-/tsutils-2.29.0.tgz#32b488501467acbedd4b85498673a0812aca0b99"
-  integrity sha512-g5JVHCIJwzfISaXpXE1qvNalca5Jwob6FjI4AoPlqMusJ6ftFE7IkkFoMhVLRgK+4Kx3gkzb8UZK5t5yTTvEmA==
-  dependencies:
-    tslib "^1.8.1"
-
 tsutils@^3.7.0:
   version "3.17.1"
   resolved "https://registry.yarnpkg.com/tsutils/-/tsutils-3.17.1.tgz#ed719917f11ca0dee586272b2ac49e015a2dd759"