diff --git a/.eslintignore b/.eslintignore
index bff77d5bf4..2796f73ec7 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -11,3 +11,5 @@ packages/docusaurus-1.x/lib/core/metadata.js
 packages/docusaurus-1.x/lib/core/MetadataBlog.js
 packages/docusaurus-1.x/lib/core/__tests__/split-tab.test.js
 packages/docusaurus-utils/lib/
+packages/docusaurus/lib/
+
diff --git a/.gitignore b/.gitignore
index e9dc44e638..2c5a6ee710 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,4 +13,6 @@ build
 .cache-loader
 types
 packages/docusaurus-utils/lib/
+packages/docusaurus/lib/
+
 
diff --git a/.prettierignore b/.prettierignore
index e762e56673..d398410c1a 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -3,3 +3,4 @@ node_modules
 build
 .docusaurus
 packages/docusaurus-utils/lib/
+packages/docusaurus/lib/
diff --git a/.prettierrc b/.prettierrc
index 3eff994f47..a2a849e3e8 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1,7 +1,6 @@
 {
   "bracketSpacing": false,
   "jsxBracketSameLine": true,
-  "parser": "flow",
   "printWidth": 80,
   "proseWrap": "never",
   "singleQuote": true,
diff --git a/package.json b/package.json
index dd6a31481b..11ad008749 100644
--- a/package.json
+++ b/package.json
@@ -13,21 +13,27 @@
     "build:v1": "yarn workspace docusaurus-1-website build",
     "build:v2": "yarn workspace docusaurus-2-website build",
     "postinstall": "yarn tsc",
-    "prettier": "prettier --config .prettierrc --write \"**/*.js\"",
-    "prettier:diff": "prettier --config .prettierrc --list-different \"**/*.js\"",
+    "prettier": "prettier --config .prettierrc --write \"**/*.{js,ts}\"",
+    "prettier:diff": "prettier --config .prettierrc --list-different \"**/*.{js,ts}\"",
     "lint": "eslint --cache \"**/*.js\"",
     "lerna": "lerna",
     "test": "jest",
-    "tsc": "lerna run --parallel tsc --no-private"
+    "tsc": "lerna run tsc --no-private"
   },
   "devDependencies": {
     "@babel/core": "^7.4.4",
     "@babel/preset-typescript": "^7.3.3",
+    "@types/chalk": "^2.2.0",
     "@types/escape-string-regexp": "^1.0.0",
+    "@types/express": "^4.16.1",
     "@types/fs-extra": "7.0.0",
+    "@types/globby": "9.1.0",
     "@types/jest": "^24.0.13",
     "@types/lodash": "^4.14.129",
     "@types/node": "^12.0.2",
+    "@types/shelljs": "^0.8.5",
+    "@types/webpack": "^4.4.31",
+    "@types/webpack-merge": "^4.1.5",
     "babel-eslint": "8",
     "enzyme": "^3.9.0",
     "enzyme-adapter-react-16": "^1.12.1",
@@ -50,7 +56,7 @@
     "react": "^16.8.4",
     "react-dom": "^16.8.4",
     "rimraf": "^2.6.3",
-    "typescript": "^3.4.5"
+    "typescript": "^3.5.0-rc"
   },
   "lint-staged": {
     "linters": {
diff --git a/packages/docusaurus-utils/src/index.ts b/packages/docusaurus-utils/src/index.ts
index 099bdb7a5f..1028d6f3ef 100644
--- a/packages/docusaurus-utils/src/index.ts
+++ b/packages/docusaurus-utils/src/index.ts
@@ -102,7 +102,7 @@ export function genChunkName(
   prefix?: string,
   preferredName?: string,
 ): string {
-  let chunkName = chunkNameCache.get(modulePath);
+  let chunkName: string | undefined = chunkNameCache.get(modulePath);
   if (!chunkName) {
     let str = modulePath;
     if (preferredName) {
@@ -146,10 +146,10 @@ export function parse(
   fileString: string,
 ): {
   frontMatter: {
-    [key: string]: any,
-  },
-  content: string,
-  excerpt: string | undefined,
+    [key: string]: any;
+  };
+  content: string;
+  excerpt: string | undefined;
 } {
   const options: {} = {
     excerpt: (file: matter.GrayMatterFile<string>): void => {
diff --git a/packages/docusaurus-utils/tsconfig.json b/packages/docusaurus-utils/tsconfig.json
index e8a156c7c6..f50aa9ee6d 100644
--- a/packages/docusaurus-utils/tsconfig.json
+++ b/packages/docusaurus-utils/tsconfig.json
@@ -1,6 +1,8 @@
 {
   "extends": "../../tsconfig.json",
   "compilerOptions": {
+    "incremental": true,
+    "tsBuildInfoFile": "./lib/.tsbuildinfo",
     "rootDir": "src",
     "outDir": "lib",
   }
diff --git a/packages/docusaurus/.npmignore b/packages/docusaurus/.npmignore
new file mode 100644
index 0000000000..0ca14ecd82
--- /dev/null
+++ b/packages/docusaurus/.npmignore
@@ -0,0 +1,2 @@
+src
+copyUntypedFiles.js
diff --git a/packages/docusaurus/bin/docusaurus.js b/packages/docusaurus/bin/docusaurus.js
index 1aeee719af..03548f3f87 100755
--- a/packages/docusaurus/bin/docusaurus.js
+++ b/packages/docusaurus/bin/docusaurus.js
@@ -12,7 +12,7 @@ const envinfo = require('envinfo');
 const semver = require('semver');
 const path = require('path');
 const program = require('commander');
-const {build, swizzle, init, deploy, start} = require('../src');
+const {build, swizzle, init, deploy, start} = require('../lib');
 const requiredVersion = require('../package.json').engines.node;
 
 if (!semver.satisfies(process.version, requiredVersion)) {
diff --git a/packages/docusaurus/copyUntypedFiles.js b/packages/docusaurus/copyUntypedFiles.js
new file mode 100644
index 0000000000..6bf16e3956
--- /dev/null
+++ b/packages/docusaurus/copyUntypedFiles.js
@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+const path = require('path');
+const fs = require('fs-extra');
+
+/**
+ * Copy all untyped and static assets files to lib.
+ */
+const srcDir = path.resolve(__dirname, 'src');
+const libDir = path.resolve(__dirname, 'lib');
+fs.copySync(srcDir, libDir, {
+  filter(filepath) {
+    return !/__tests__/.test(filepath) && !/\.ts$/.test(filepath);
+  },
+});
diff --git a/packages/docusaurus/package.json b/packages/docusaurus/package.json
index 4690b646a0..29573d1f1b 100644
--- a/packages/docusaurus/package.json
+++ b/packages/docusaurus/package.json
@@ -23,7 +23,7 @@
     "docusaurus": "bin/docusaurus.js"
   },
   "scripts": {
-    "docusaurus": "node bin/docusaurus"
+    "tsc": "tsc && node copyUntypedFiles.js"
   },
   "bugs": {
     "url": "https://github.com/facebook/Docusaurus/issues"
diff --git a/packages/docusaurus/src/commands/build.js b/packages/docusaurus/src/commands/build.ts
similarity index 71%
rename from packages/docusaurus/src/commands/build.js
rename to packages/docusaurus/src/commands/build.ts
index 2a62ed426e..166591763e 100644
--- a/packages/docusaurus/src/commands/build.js
+++ b/packages/docusaurus/src/commands/build.ts
@@ -5,21 +5,21 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const webpack = require('webpack');
-const merge = require('webpack-merge');
-const CleanWebpackPlugin = require('clean-webpack-plugin');
-const ReactLoadableSSRAddon = require('react-loadable-ssr-addon');
-const {BundleAnalyzerPlugin} = require('webpack-bundle-analyzer');
-const path = require('path');
-const chalk = require('chalk');
-const fs = require('fs-extra');
-const globby = require('globby');
-const load = require('../server');
-const createServerConfig = require('../webpack/server');
-const createClientConfig = require('../webpack/client');
-const {applyConfigureWebpack} = require('../webpack/utils');
+import webpack, {Configuration, Plugin} from 'webpack';
+import merge from 'webpack-merge';
+import CleanWebpackPlugin from 'clean-webpack-plugin';
+import ReactLoadableSSRAddon from 'react-loadable-ssr-addon';
+import {BundleAnalyzerPlugin} from 'webpack-bundle-analyzer';
+import path from 'path';
+import chalk from 'chalk';
+import fs from 'fs-extra';
+import globby from 'globby';
+import {load, CLIOptions, Props} from '../server';
+import {createClientConfig} from '../webpack/client';
+import {createServerConfig} from '../webpack/server';
+import {applyConfigureWebpack} from '../webpack/utils';
 
-function compile(config) {
+function compile(config: Configuration[]): Promise<any> {
   return new Promise((resolve, reject) => {
     const compiler = webpack(config);
     compiler.run((err, stats) => {
@@ -42,16 +42,19 @@ function compile(config) {
   });
 }
 
-module.exports = async function build(siteDir, cliOptions = {}) {
+export async function build(
+  siteDir: string,
+  cliOptions: CLIOptions = {},
+): Promise<void> {
   process.env.NODE_ENV = 'production';
   console.log(chalk.blue('Creating an optimized production build...'));
 
-  const props = await load(siteDir, cliOptions);
+  const props: Props = await load(siteDir, cliOptions);
 
   // Apply user webpack config.
   const {outDir, plugins} = props;
 
-  let clientConfig = merge(createClientConfig(props), {
+  let clientConfig: Configuration = merge(createClientConfig(props), {
     plugins: [
       // Remove/clean build folders before building bundles.
       new CleanWebpackPlugin({verbose: false}),
@@ -61,10 +64,10 @@ module.exports = async function build(siteDir, cliOptions = {}) {
       new ReactLoadableSSRAddon({
         filename: 'client-manifest.json',
       }),
-    ].filter(Boolean),
+    ].filter(Boolean) as Plugin[],
   });
 
-  let serverConfig = createServerConfig(props);
+  let serverConfig: Configuration = createServerConfig(props);
 
   // Plugin lifecycle - configureWebpack
   plugins.forEach(plugin => {
@@ -88,7 +91,9 @@ module.exports = async function build(siteDir, cliOptions = {}) {
   await compile([clientConfig, serverConfig]);
 
   // Remove server.bundle.js because it is useless
-  await fs.unlink(path.join(outDir, serverConfig.output.filename));
+  if (serverConfig.output && serverConfig.output.filename) {
+    await fs.unlink(path.join(outDir, serverConfig.output.filename));
+  }
 
   // Copy static files.
   const staticDir = path.resolve(siteDir, 'static');
@@ -121,4 +126,4 @@ module.exports = async function build(siteDir, cliOptions = {}) {
       relativeDir,
     )}.\n`,
   );
-};
+}
diff --git a/packages/docusaurus/src/commands/deploy.js b/packages/docusaurus/src/commands/deploy.ts
similarity index 68%
rename from packages/docusaurus/src/commands/deploy.js
rename to packages/docusaurus/src/commands/deploy.ts
index 9b0c0a29cc..94c2b7f7ae 100644
--- a/packages/docusaurus/src/commands/deploy.js
+++ b/packages/docusaurus/src/commands/deploy.ts
@@ -5,14 +5,14 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const path = require('path');
-const shell = require('shelljs');
-const fs = require('fs-extra');
-const build = require('./build');
-const loadConfig = require('../server/load/config');
-const {CONFIG_FILE_NAME} = require('../constants');
+import path from 'path';
+import shell from 'shelljs';
+import fs from 'fs-extra';
+import {build} from './build';
+import {loadConfig} from '../server/config';
+import {CONFIG_FILE_NAME} from '../constants';
 
-module.exports = async function deploy(siteDir) {
+export async function deploy(siteDir: string): Promise<void> {
   console.log('Deploy command invoked ...');
   if (!shell.which('git')) {
     throw new Error('Sorry, this script requires git');
@@ -136,57 +136,38 @@ module.exports = async function deploy(siteDir) {
         '.docusaurus',
         `${projectName}-${deploymentBranch}`,
       );
-      // In github.io case, project is deployed to root. Need to not recursively
-      // copy the deployment-branch to be.
-      const excludePath = `${projectName}-${deploymentBranch}`;
 
-      // cannot use shell.cp because it doesn't support copying dotfiles and we
-      // need to copy directories like .circleci, for example
-      // https://github.com/shelljs/shelljs/issues/79
-      fs.copy(
-        fromPath,
-        toPath,
-        src => {
-          if (src.indexOf('.DS_Store') !== -1) {
-            return false;
-          }
-          if (src.indexOf(excludePath) !== -1) {
-            return false;
-          }
-          return true;
-        },
-        error => {
-          if (error) {
-            throw new Error(
-              `Error: Copying build assets failed with error '${error}'`,
-            );
-          }
+      fs.copy(fromPath, toPath, error => {
+        if (error) {
+          throw new Error(
+            `Error: Copying build assets failed with error '${error}'`,
+          );
+        }
 
-          shell.cd(toPath);
-          shell.exec('git add --all');
+        shell.cd(toPath);
+        shell.exec('git add --all');
 
-          const commitMessage =
-            process.env.CUSTOM_COMMIT_MESSAGE ||
-            `Deploy website version based on ${currentCommit}`;
-          const commitResults = shell.exec(`git commit -m "${commitMessage}"`);
-          if (
-            shell.exec(`git push --force origin ${deploymentBranch}`).code !== 0
-          ) {
-            throw new Error('Error: Git push failed');
-          } else if (commitResults.code === 0) {
-            // The commit might return a non-zero value when site is up to date.
-            const websiteURL =
-              githubHost === 'github.com'
-                ? `https://${organizationName}.github.io/${projectName}` // gh-pages hosted repo
-                : `https://${githubHost}/pages/${organizationName}/${projectName}`; // GitHub enterprise hosting.
-            shell.echo(`Website is live at: ${websiteURL}`);
-            shell.exit(0);
-          }
-        },
-      );
+        const commitMessage =
+          process.env.CUSTOM_COMMIT_MESSAGE ||
+          `Deploy website version based on ${currentCommit}`;
+        const commitResults = shell.exec(`git commit -m "${commitMessage}"`);
+        if (
+          shell.exec(`git push --force origin ${deploymentBranch}`).code !== 0
+        ) {
+          throw new Error('Error: Git push failed');
+        } else if (commitResults.code === 0) {
+          // The commit might return a non-zero value when site is up to date.
+          const websiteURL =
+            githubHost === 'github.com'
+              ? `https://${organizationName}.github.io/${projectName}` // gh-pages hosted repo
+              : `https://${githubHost}/pages/${organizationName}/${projectName}`; // GitHub enterprise hosting.
+          shell.echo(`Website is live at: ${websiteURL}`);
+          shell.exit(0);
+        }
+      });
     })
     .catch(buildError => {
       console.error(buildError);
       process.exit(1);
     });
-};
+}
diff --git a/packages/docusaurus/src/commands/init.js b/packages/docusaurus/src/commands/init.ts
similarity index 67%
rename from packages/docusaurus/src/commands/init.js
rename to packages/docusaurus/src/commands/init.ts
index cb5bed2b94..6811b2149b 100644
--- a/packages/docusaurus/src/commands/init.js
+++ b/packages/docusaurus/src/commands/init.ts
@@ -5,10 +5,15 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-module.exports = async function init(projectDir, cliOptions = {}) {
+import {CLIOptions} from '../server';
+
+export async function init(
+  projectDir: string,
+  cliOptions: CLIOptions = {},
+): Promise<void> {
   console.log('Init command invoked ...');
   console.log(projectDir);
   console.log(cliOptions);
 
   // TODO
-};
+}
diff --git a/packages/docusaurus/src/commands/start.js b/packages/docusaurus/src/commands/start.ts
similarity index 69%
rename from packages/docusaurus/src/commands/start.js
rename to packages/docusaurus/src/commands/start.ts
index 475fc69c57..b8f495627a 100644
--- a/packages/docusaurus/src/commands/start.js
+++ b/packages/docusaurus/src/commands/start.ts
@@ -5,36 +5,39 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const _ = require('lodash');
-const path = require('path');
-const express = require('express');
-const chalk = require('chalk');
-const webpack = require('webpack');
-const chokidar = require('chokidar');
-const portfinder = require('portfinder');
-const openBrowser = require('react-dev-utils/openBrowser');
-const {prepareUrls} = require('react-dev-utils/WebpackDevServerUtils');
-const HtmlWebpackPlugin = require('html-webpack-plugin');
-const HotModuleReplacementPlugin = require('webpack/lib/HotModuleReplacementPlugin');
-const WebpackDevServer = require('webpack-dev-server');
-const merge = require('webpack-merge');
-const {normalizeUrl} = require('@docusaurus/utils');
-const load = require('../server');
-const {CONFIG_FILE_NAME} = require('../constants');
-const createClientConfig = require('../webpack/client');
-const {applyConfigureWebpack} = require('../webpack/utils');
+import _ from 'lodash';
+import path from 'path';
+import webpack from 'webpack';
+import express from 'express';
+import chalk from 'chalk';
+import chokidar from 'chokidar';
+import portfinder from 'portfinder';
+import openBrowser from 'react-dev-utils/openBrowser';
+import {prepareUrls} from 'react-dev-utils/WebpackDevServerUtils';
+import HtmlWebpackPlugin from 'html-webpack-plugin';
+import HotModuleReplacementPlugin from 'webpack/lib/HotModuleReplacementPlugin';
+import WebpackDevServer from 'webpack-dev-server';
+import merge from 'webpack-merge';
+import {normalizeUrl} from '@docusaurus/utils';
+import {load, CLIOptions} from '../server';
+import {CONFIG_FILE_NAME} from '../constants';
+import {createClientConfig} from '../webpack/client';
+import {applyConfigureWebpack} from '../webpack/utils';
 
-function getHost(reqHost) {
+function getHost(reqHost: string | undefined): string {
   return reqHost || 'localhost';
 }
 
-async function getPort(reqPort) {
-  portfinder.basePort = parseInt(reqPort, 10) || 3000;
+async function getPort(reqPort: string | undefined): Promise<number> {
+  portfinder.basePort = reqPort ? parseInt(reqPort, 10) : 3000;
   const port = await portfinder.getPortPromise();
   return port;
 }
 
-module.exports = async function start(siteDir, cliOptions = {}) {
+export async function start(
+  siteDir: string,
+  cliOptions: CLIOptions = {},
+): Promise<void> {
   console.log(chalk.blue('Starting the development server...'));
 
   // Process all related files as a prop.
@@ -126,16 +129,9 @@ module.exports = async function start(siteDir, cliOptions = {}) {
     // Enable overlay on browser. E.g: display errors
     overlay: true,
     host,
-    // https://webpack.js.org/configuration/dev-server/#devserverbefore
-    // eslint-disable-next-line
-    before(app, server) {
+    before(app) {
       app.use(baseUrl, express.static(path.resolve(siteDir, 'static')));
-      // TODO: add plugins beforeDevServer hook
-    },
-    // https://webpack.js.org/configuration/dev-server/#devserverbefore
-    // eslint-disable-next-line
-    after(app, server) {
-      // TODO: add plugins afterDevServer hook
+      // TODO: add plugins beforeDevServer and afterDevServer hook
     },
   };
   WebpackDevServer.addDevServerEntrypoints(config, devServerConfig);
@@ -148,9 +144,9 @@ module.exports = async function start(siteDir, cliOptions = {}) {
     openBrowser(openUrl);
   });
   ['SIGINT', 'SIGTERM'].forEach(sig => {
-    process.on(sig, () => {
+    process.on(sig as NodeJS.Signals, () => {
       devServer.close();
       process.exit();
     });
   });
-};
+}
diff --git a/packages/docusaurus/src/commands/swizzle.js b/packages/docusaurus/src/commands/swizzle.ts
similarity index 79%
rename from packages/docusaurus/src/commands/swizzle.js
rename to packages/docusaurus/src/commands/swizzle.ts
index 9c1489b775..2f9ff185b5 100644
--- a/packages/docusaurus/src/commands/swizzle.js
+++ b/packages/docusaurus/src/commands/swizzle.ts
@@ -5,12 +5,16 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const fs = require('fs-extra');
-const chalk = require('chalk');
-const path = require('path');
-const importFresh = require('import-fresh');
+import fs from 'fs-extra';
+import chalk from 'chalk';
+import path from 'path';
+import importFresh from 'import-fresh';
 
-module.exports = async function swizzle(siteDir, themeName, componentName) {
+export async function swizzle(
+  siteDir: string,
+  themeName: string,
+  componentName?: string,
+): Promise<void> {
   const Plugin = importFresh(themeName);
   const context = {siteDir};
   const PluginInstance = new Plugin(context);
@@ -33,4 +37,4 @@ module.exports = async function swizzle(siteDir, themeName, componentName) {
       `\n${chalk.green('Success!')} Copied ${fromMsg} to ${toMsg}.\n`,
     );
   }
-};
+}
diff --git a/packages/docusaurus/src/constants.js b/packages/docusaurus/src/constants.ts
similarity index 62%
rename from packages/docusaurus/src/constants.js
rename to packages/docusaurus/src/constants.ts
index fa0a7d576f..b345a4e7db 100644
--- a/packages/docusaurus/src/constants.js
+++ b/packages/docusaurus/src/constants.ts
@@ -5,7 +5,5 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-module.exports = {
-  GENERATED_FILES_DIR_NAME: '.docusaurus',
-  CONFIG_FILE_NAME: 'docusaurus.config.js',
-};
+export const GENERATED_FILES_DIR_NAME = '.docusaurus';
+export const CONFIG_FILE_NAME = 'docusaurus.config.js';
diff --git a/packages/docusaurus/src/index.js b/packages/docusaurus/src/index.js
deleted file mode 100644
index 6b2018f0cb..0000000000
--- a/packages/docusaurus/src/index.js
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Copyright (c) 2017-present, Facebook, Inc.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-const build = require('./commands/build');
-const init = require('./commands/init');
-const start = require('./commands/start');
-const swizzle = require('./commands/swizzle');
-const deploy = require('./commands/deploy');
-
-module.exports = {
-  build,
-  swizzle,
-  init,
-  start,
-  deploy,
-};
diff --git a/packages/docusaurus/src/index.ts b/packages/docusaurus/src/index.ts
new file mode 100644
index 0000000000..f1748fa47b
--- /dev/null
+++ b/packages/docusaurus/src/index.ts
@@ -0,0 +1,12 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+export {build} from './commands/build';
+export {init} from './commands/init';
+export {start} from './commands/start';
+export {swizzle} from './commands/swizzle';
+export {deploy} from './commands/deploy';
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/bad-site/docusaurus.config.js b/packages/docusaurus/src/server/__tests__/__fixtures__/bad-site/docusaurus.config.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/bad-site/docusaurus.config.js
rename to packages/docusaurus/src/server/__tests__/__fixtures__/bad-site/docusaurus.config.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/docusaurus.config.js b/packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/docusaurus.config.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/docusaurus.config.js
rename to packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/docusaurus.config.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/pages/bar/baz.js b/packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/pages/bar/baz.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/pages/bar/baz.js
rename to packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/pages/bar/baz.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/pages/foo.js b/packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/pages/foo.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/pages/foo.js
rename to packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/pages/foo.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/pages/foo/index.js b/packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/pages/foo/index.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/pages/foo/index.js
rename to packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/pages/foo/index.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/pages/index.js b/packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/pages/index.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/pages/index.js
rename to packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/pages/index.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/sidebars.json b/packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/sidebars.json
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/sidebars.json
rename to packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/sidebars.json
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/static/img/docusaurus.ico b/packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/static/img/docusaurus.ico
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/static/img/docusaurus.ico
rename to packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/static/img/docusaurus.ico
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/static/img/docusaurus.svg b/packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/static/img/docusaurus.svg
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/custom-site/static/img/docusaurus.svg
rename to packages/docusaurus/src/server/__tests__/__fixtures__/custom-site/static/img/docusaurus.svg
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/docs/foo/bar.md b/packages/docusaurus/src/server/__tests__/__fixtures__/docs/foo/bar.md
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/docs/foo/bar.md
rename to packages/docusaurus/src/server/__tests__/__fixtures__/docs/foo/bar.md
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/docs/foo/baz.md b/packages/docusaurus/src/server/__tests__/__fixtures__/docs/foo/baz.md
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/docs/foo/baz.md
rename to packages/docusaurus/src/server/__tests__/__fixtures__/docs/foo/baz.md
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/docs/hello.md b/packages/docusaurus/src/server/__tests__/__fixtures__/docs/hello.md
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/docs/hello.md
rename to packages/docusaurus/src/server/__tests__/__fixtures__/docs/hello.md
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/docs/permalink.md b/packages/docusaurus/src/server/__tests__/__fixtures__/docs/permalink.md
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/docs/permalink.md
rename to packages/docusaurus/src/server/__tests__/__fixtures__/docs/permalink.md
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/docusaurus.config.js b/packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/docusaurus.config.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/docusaurus.config.js
rename to packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/docusaurus.config.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/pages/hello/world.js b/packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/pages/hello/world.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/pages/hello/world.js
rename to packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/pages/hello/world.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/pages/index.js b/packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/pages/index.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/pages/index.js
rename to packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/pages/index.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/sidebars.json b/packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/sidebars.json
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/sidebars.json
rename to packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/sidebars.json
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/static/img/docusaurus.ico b/packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/static/img/docusaurus.ico
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/static/img/docusaurus.ico
rename to packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/static/img/docusaurus.ico
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/static/img/docusaurus.svg b/packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/static/img/docusaurus.svg
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/static/img/docusaurus.svg
rename to packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/static/img/docusaurus.svg
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/static/img/sakura.png b/packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/static/img/sakura.png
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/static/img/sakura.png
rename to packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/static/img/sakura.png
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/static/img/slash-introducing.png b/packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/static/img/slash-introducing.png
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/simple-site/static/img/slash-introducing.png
rename to packages/docusaurus/src/server/__tests__/__fixtures__/simple-site/static/img/slash-introducing.png
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/wrong-site/docusaurus.config.js b/packages/docusaurus/src/server/__tests__/__fixtures__/wrong-site/docusaurus.config.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/wrong-site/docusaurus.config.js
rename to packages/docusaurus/src/server/__tests__/__fixtures__/wrong-site/docusaurus.config.js
diff --git a/packages/docusaurus/src/server/load/__tests__/config.test.js b/packages/docusaurus/src/server/__tests__/config.test.ts
similarity index 76%
rename from packages/docusaurus/src/server/load/__tests__/config.test.js
rename to packages/docusaurus/src/server/__tests__/config.test.ts
index 1e9d9e9b9e..ac33e4ce88 100644
--- a/packages/docusaurus/src/server/load/__tests__/config.test.js
+++ b/packages/docusaurus/src/server/__tests__/config.test.ts
@@ -6,12 +6,12 @@
  */
 
 import path from 'path';
-import loadConfig from '../config';
-import loadSetup from '../loadSetup';
+import {loadConfig} from '../config';
 
 describe('loadConfig', () => {
   test('website with valid siteConfig', async () => {
-    const {siteDir} = await loadSetup('simple');
+    const fixtures = path.join(__dirname, '__fixtures__');
+    const siteDir = path.join(fixtures, 'simple-site');
     const config = loadConfig(siteDir);
     expect(config).toMatchInlineSnapshot(
       {
@@ -38,7 +38,7 @@ describe('loadConfig', () => {
     expect(() => {
       loadConfig(siteDir);
     }).toThrowErrorMatchingInlineSnapshot(
-      `"The required field(s) 'favicon', 'organizationName', 'projectName', 'tagline', 'url' are missing from docusaurus.config.js"`,
+      `"The required field(s) 'favicon', 'tagline', 'url' are missing from docusaurus.config.js"`,
     );
   });
 
@@ -55,8 +55,6 @@ describe('loadConfig', () => {
     const siteDir = path.join(__dirname, '__fixtures__', 'nonExisting');
     expect(() => {
       loadConfig(siteDir);
-    }).toThrowErrorMatchingInlineSnapshot(
-      `"The required field(s) 'baseUrl', 'favicon', 'organizationName', 'projectName', 'tagline', 'title', 'url' are missing from docusaurus.config.js"`,
-    );
+    }).toThrowErrorMatchingInlineSnapshot(`"docusaurus.config.js not found"`);
   });
 });
diff --git a/packages/docusaurus/src/server/load/__tests__/routes.test.js b/packages/docusaurus/src/server/__tests__/routes.test.ts
similarity index 95%
rename from packages/docusaurus/src/server/load/__tests__/routes.test.js
rename to packages/docusaurus/src/server/__tests__/routes.test.ts
index b900b0ba7d..2bab44a459 100644
--- a/packages/docusaurus/src/server/load/__tests__/routes.test.js
+++ b/packages/docusaurus/src/server/__tests__/routes.test.ts
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import loadSetup from '../loadSetup';
+import {loadSetup} from '../loadSetup';
 
 describe('loadRoutes', () => {
   test('simple website', async () => {
diff --git a/packages/docusaurus/src/server/load/config.js b/packages/docusaurus/src/server/config.ts
similarity index 60%
rename from packages/docusaurus/src/server/load/config.js
rename to packages/docusaurus/src/server/config.ts
index cda6749c89..4061330b05 100644
--- a/packages/docusaurus/src/server/load/config.js
+++ b/packages/docusaurus/src/server/config.ts
@@ -5,23 +5,35 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const fs = require('fs-extra');
-const _ = require('lodash');
-const importFresh = require('import-fresh');
-const path = require('path');
-const {CONFIG_FILE_NAME} = require('../../constants');
+import fs from 'fs-extra';
+import _ from 'lodash';
+import importFresh from 'import-fresh';
+import path from 'path';
+import {CONFIG_FILE_NAME} from '../constants';
 
-const REQUIRED_FIELDS = [
-  'baseUrl',
-  'favicon',
-  'organizationName',
-  'projectName',
-  'tagline',
-  'title',
-  'url',
-];
+export interface DocusaurusConfig {
+  baseUrl: string;
+  favicon: string;
+  tagline: string;
+  title: string;
+  url: string;
+  organizationName?: string;
+  projectName?: string;
+  customFields?: string[];
+  githubHost?: string;
+  plugins?: any[];
+  presets?: any[];
+  themeConfig?: {
+    [key: string]: any;
+  };
+  [key: string]: any;
+}
+
+const REQUIRED_FIELDS = ['baseUrl', 'favicon', 'tagline', 'title', 'url'];
 
 const OPTIONAL_FIELDS = [
+  'organizationName',
+  'projectName',
   'customFields',
   'githubHost',
   'plugins',
@@ -29,21 +41,23 @@ const OPTIONAL_FIELDS = [
   'themeConfig',
 ];
 
-const DEFAULT_CONFIG = {
+const DEFAULT_CONFIG: {
+  [key: string]: any;
+} = {
   plugins: [],
 };
 
-function formatFields(fields) {
+function formatFields(fields: string[]): string {
   return fields.map(field => `'${field}'`).join(', ');
 }
 
-function loadConfig(siteDir) {
+export function loadConfig(siteDir: string): DocusaurusConfig {
   const configPath = path.resolve(siteDir, CONFIG_FILE_NAME);
-  let loadedConfig = {};
-  if (fs.existsSync(configPath)) {
-    loadedConfig = importFresh(configPath);
-  }
 
+  if (!fs.existsSync(configPath)) {
+    throw new Error(`${CONFIG_FILE_NAME} not found`);
+  }
+  const loadedConfig = importFresh(configPath);
   const missingFields = REQUIRED_FIELDS.filter(
     field => !_.has(loadedConfig, field),
   );
@@ -56,7 +70,7 @@ function loadConfig(siteDir) {
   }
 
   // Merge default config with loaded config.
-  const config = {...DEFAULT_CONFIG, ...loadedConfig};
+  const config: DocusaurusConfig = {...DEFAULT_CONFIG, ...loadedConfig};
 
   // User's own array of custom fields/
   // e.g: if they want to include some.field so they can access it later from `props.siteConfig`.
@@ -81,5 +95,3 @@ function loadConfig(siteDir) {
 
   return config;
 }
-
-module.exports = loadConfig;
diff --git a/packages/docusaurus/src/server/index.js b/packages/docusaurus/src/server/index.js
deleted file mode 100644
index 4e87106316..0000000000
--- a/packages/docusaurus/src/server/index.js
+++ /dev/null
@@ -1,138 +0,0 @@
-/**
- * Copyright (c) 2017-present, Facebook, Inc.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-const path = require('path');
-
-const {generate} = require('@docusaurus/utils');
-const loadConfig = require('./load/config');
-const loadTheme = require('./load/theme');
-const loadRoutes = require('./load/routes');
-const loadPlugins = require('./load/plugins');
-const loadPresets = require('./load/presets');
-const constants = require('../constants');
-
-module.exports = async function load(siteDir, cliOptions = {}) {
-  const generatedFilesDir = path.resolve(
-    siteDir,
-    constants.GENERATED_FILES_DIR_NAME,
-  );
-
-  const siteConfig = loadConfig(siteDir);
-  await generate(
-    generatedFilesDir,
-    constants.CONFIG_FILE_NAME,
-    `export default ${JSON.stringify(siteConfig, null, 2)};`,
-  );
-
-  const context = {siteDir, generatedFilesDir, siteConfig, cliOptions};
-
-  // Process presets.
-  const {plugins: presetPlugins, themes: presetThemes} = loadPresets(context);
-
-  // Process plugins and themes. Themes are also plugins, but they run after all
-  // the explicit plugins because they may override the resolve.alias(es)
-  // defined by the plugins.
-  const pluginConfigs = [
-    ...presetPlugins,
-    ...(siteConfig.plugins || []),
-    ...presetThemes,
-    ...(siteConfig.themes || []),
-  ];
-
-  const {plugins, pluginsRouteConfigs} = await loadPlugins({
-    pluginConfigs,
-    context,
-  });
-
-  const outDir = path.resolve(siteDir, 'build');
-  const {baseUrl} = siteConfig;
-
-  // Default theme components that are essential and must exist in a Docusaurus app
-  // These can be overriden in plugins/ through component swizzling.
-  // However, we alias it here first as a fallback.
-  const themeFallback = path.resolve(__dirname, '../client/theme-fallback');
-  const fallbackAliases = await loadTheme(themeFallback);
-
-  // Create theme alias from plugins.
-  const pluginThemeAliases = await Promise.all(
-    plugins.map(async plugin => {
-      if (!plugin.getThemePath) {
-        return null;
-      }
-      return loadTheme(plugin.getThemePath());
-    }),
-  );
-
-  // User's own theme alias override. Highest priority.
-  const themePath = path.resolve(siteDir, 'theme');
-  const userAliases = await loadTheme(themePath);
-
-  const combinedAliases = [
-    fallbackAliases,
-    ...pluginThemeAliases,
-    userAliases,
-  ].reduce(
-    (acc, curr) => ({
-      ...acc,
-      ...curr,
-    }),
-    {},
-  );
-
-  // Make a fake plugin to resolve aliased theme components.
-  plugins.push({
-    configureWebpack: () => ({
-      resolve: {
-        alias: combinedAliases,
-      },
-    }),
-  });
-
-  // Routing
-  const {
-    registry,
-    routesChunkNames,
-    routesConfig,
-    routesPaths,
-  } = await loadRoutes(pluginsRouteConfigs);
-
-  await generate(
-    generatedFilesDir,
-    'registry.js',
-    `export default {
-${Object.keys(registry)
-  .map(
-    key => `  '${key}': {
-    'importStatement': ${registry[key].importStatement},
-    'module': '${registry[key].modulePath}',
-    'webpack': require.resolveWeak('${registry[key].modulePath}'),
-  },`,
-  )
-  .join('\n')}};\n`,
-  );
-
-  await generate(
-    generatedFilesDir,
-    'routesChunkNames.json',
-    JSON.stringify(routesChunkNames, null, 2),
-  );
-
-  await generate(generatedFilesDir, 'routes.js', routesConfig);
-
-  const props = {
-    siteConfig,
-    siteDir,
-    outDir,
-    baseUrl,
-    generatedFilesDir,
-    routesPaths,
-    plugins,
-    cliOptions,
-  };
-
-  return props;
-};
diff --git a/packages/docusaurus/src/server/index.ts b/packages/docusaurus/src/server/index.ts
new file mode 100644
index 0000000000..ee04a834b6
--- /dev/null
+++ b/packages/docusaurus/src/server/index.ts
@@ -0,0 +1,137 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import path from 'path';
+import {generate} from '@docusaurus/utils';
+
+import {loadConfig, DocusaurusConfig} from './config';
+import {loadThemeAlias} from './themes';
+import {loadPlugins} from './plugins';
+import {loadRoutes} from './routes';
+import {loadPresets} from './presets';
+import {GENERATED_FILES_DIR_NAME, CONFIG_FILE_NAME} from '../constants';
+
+export interface CLIOptions {
+  [option: string]: any;
+}
+
+export interface LoadContext {
+  siteDir: string;
+  generatedFilesDir: string;
+  siteConfig: DocusaurusConfig;
+  cliOptions: CLIOptions;
+  outDir: string;
+  baseUrl: string;
+}
+export interface Props extends LoadContext {
+  routesPaths: string[];
+  plugins: any[];
+}
+
+export async function load(
+  siteDir: string,
+  cliOptions: CLIOptions = {},
+): Promise<Props> {
+  const generatedFilesDir: string = path.resolve(
+    siteDir,
+    GENERATED_FILES_DIR_NAME,
+  );
+
+  const siteConfig: DocusaurusConfig = loadConfig(siteDir);
+  await generate(
+    generatedFilesDir,
+    CONFIG_FILE_NAME,
+    `export default ${JSON.stringify(siteConfig, null, 2)};`,
+  );
+
+  const outDir = path.resolve(siteDir, 'build');
+  const {baseUrl} = siteConfig;
+
+  const context: LoadContext = {
+    siteDir,
+    generatedFilesDir,
+    siteConfig,
+    cliOptions,
+    outDir,
+    baseUrl,
+  };
+
+  /* Preset */
+  const {plugins: presetPlugins, themes: presetThemes} = loadPresets(context);
+
+  /* Plugin */
+  const pluginConfigs = [
+    ...presetPlugins,
+    ...(siteConfig.plugins || []),
+    ...presetThemes,
+    ...(siteConfig.themes || []),
+  ];
+  const {plugins, pluginsRouteConfigs} = await loadPlugins({
+    pluginConfigs,
+    context,
+  });
+
+  /* Theme */
+  const fallbackTheme = path.resolve(__dirname, '../client/theme-fallback');
+  const pluginThemes = plugins
+    .map(plugin => plugin.getThemePath && plugin.getThemePath())
+    .filter(Boolean) as string[];
+  const userTheme = path.resolve(siteDir, 'theme');
+  const alias = loadThemeAlias([fallbackTheme, ...pluginThemes, userTheme]);
+  // Make a fake plugin to resolve aliased theme components.
+  plugins.push({
+    configureWebpack: () => ({
+      resolve: {
+        alias,
+      },
+    }),
+  });
+
+  // Routing
+  const {
+    registry,
+    routesChunkNames,
+    routesConfig,
+    routesPaths,
+  } = await loadRoutes(pluginsRouteConfigs);
+
+  await generate(
+    generatedFilesDir,
+    'registry.js',
+    `export default {
+${Object.keys(registry)
+  .map(
+    key => `  '${key}': {
+    'importStatement': ${registry[key].importStatement},
+    'module': '${registry[key].modulePath}',
+    'webpack': require.resolveWeak('${registry[key].modulePath}'),
+  },`,
+  )
+  .join('\n')}};\n`,
+  );
+
+  await generate(
+    generatedFilesDir,
+    'routesChunkNames.json',
+    JSON.stringify(routesChunkNames, null, 2),
+  );
+
+  await generate(generatedFilesDir, 'routes.js', routesConfig);
+
+  const props = {
+    siteConfig,
+    siteDir,
+    outDir,
+    baseUrl,
+    generatedFilesDir,
+    routesPaths,
+    plugins,
+    cliOptions,
+  };
+
+  return props;
+}
diff --git a/packages/docusaurus/src/server/load/loadSetup.js b/packages/docusaurus/src/server/loadSetup.ts
similarity index 84%
rename from packages/docusaurus/src/server/load/loadSetup.js
rename to packages/docusaurus/src/server/loadSetup.ts
index 8a1f556173..1e9bc6a1f7 100644
--- a/packages/docusaurus/src/server/load/loadSetup.js
+++ b/packages/docusaurus/src/server/loadSetup.ts
@@ -6,22 +6,19 @@
  */
 
 import path from 'path';
-import load from '../index';
+import {load, Props} from './index';
 
 // Helper methods to setup dummy/fake projects
-const loadSetup = async name => {
+export const loadSetup = async (name: string): Promise<Props> => {
   const fixtures = path.join(__dirname, '__tests__', '__fixtures__');
   const simpleSite = path.join(fixtures, 'simple-site');
   const customSite = path.join(fixtures, 'custom-site');
 
   switch (name) {
-    case 'simple':
-      return load(simpleSite);
     case 'custom':
       return load(customSite);
+    case 'simple':
     default:
-      return {};
+      return load(simpleSite);
   }
 };
-
-export default loadSetup;
diff --git a/packages/docusaurus/src/server/load/plugins.js b/packages/docusaurus/src/server/plugins/index.ts
similarity index 84%
rename from packages/docusaurus/src/server/load/plugins.js
rename to packages/docusaurus/src/server/plugins/index.ts
index dae3e4aa8b..695cb5358b 100644
--- a/packages/docusaurus/src/server/load/plugins.js
+++ b/packages/docusaurus/src/server/plugins/index.ts
@@ -5,12 +5,19 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const fs = require('fs-extra');
-const importFresh = require('import-fresh');
-const path = require('path');
-const {generate} = require('@docusaurus/utils');
+import fs from 'fs-extra';
+import importFresh from 'import-fresh';
+import path from 'path';
+import {generate} from '@docusaurus/utils';
+import {LoadContext} from '..';
 
-module.exports = async function loadPlugins({pluginConfigs = [], context}) {
+export async function loadPlugins({
+  pluginConfigs = [],
+  context,
+}: {
+  pluginConfigs: any[];
+  context: LoadContext;
+}) {
   // 1. Plugin Lifecycle - Initialization/Constructor
   const plugins = pluginConfigs.map(({name, path: pluginPath, options}) => {
     let Plugin;
@@ -37,7 +44,7 @@ module.exports = async function loadPlugins({pluginConfigs = [], context}) {
   );
 
   // 3. Plugin lifecycle - contentLoaded
-  const pluginsRouteConfigs = [];
+  const pluginsRouteConfigs: any[] = [];
 
   await Promise.all(
     plugins.map(async (plugin, index) => {
@@ -68,4 +75,4 @@ module.exports = async function loadPlugins({pluginConfigs = [], context}) {
     plugins,
     pluginsRouteConfigs,
   };
-};
+}
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/preset-bar.js b/packages/docusaurus/src/server/presets/__tests__/__fixtures__/preset-bar.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/preset-bar.js
rename to packages/docusaurus/src/server/presets/__tests__/__fixtures__/preset-bar.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/preset-foo.js b/packages/docusaurus/src/server/presets/__tests__/__fixtures__/preset-foo.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/preset-foo.js
rename to packages/docusaurus/src/server/presets/__tests__/__fixtures__/preset-foo.js
diff --git a/packages/docusaurus/src/server/load/__tests__/__fixtures__/preset-qux.js b/packages/docusaurus/src/server/presets/__tests__/__fixtures__/preset-qux.js
similarity index 100%
rename from packages/docusaurus/src/server/load/__tests__/__fixtures__/preset-qux.js
rename to packages/docusaurus/src/server/presets/__tests__/__fixtures__/preset-qux.js
diff --git a/packages/docusaurus/src/server/load/__tests__/presets.test.js b/packages/docusaurus/src/server/presets/__tests__/index.test.ts
similarity index 87%
rename from packages/docusaurus/src/server/load/__tests__/presets.test.js
rename to packages/docusaurus/src/server/presets/__tests__/index.test.ts
index 14fd9fddeb..40d79d2b89 100644
--- a/packages/docusaurus/src/server/load/__tests__/presets.test.js
+++ b/packages/docusaurus/src/server/presets/__tests__/index.test.ts
@@ -7,11 +7,13 @@
 
 import path from 'path';
 
-import loadPresets from '../presets';
+import {loadPresets} from '../index';
+import {LoadContext} from '../../index';
 
 describe('loadPresets', () => {
   test('no presets', () => {
-    const presets = loadPresets({siteConfig: {presets: []}});
+    const context = {siteConfig: {}} as LoadContext;
+    const presets = loadPresets(context);
     expect(presets).toMatchInlineSnapshot(`
 Object {
   "plugins": Array [],
@@ -21,11 +23,12 @@ Object {
   });
 
   test('string form', () => {
-    const presets = loadPresets({
+    const context = {
       siteConfig: {
         presets: [path.join(__dirname, '__fixtures__/preset-bar.js')],
       },
-    });
+    } as LoadContext;
+    const presets = loadPresets(context);
     expect(presets).toMatchInlineSnapshot(`
 Object {
   "plugins": Array [
@@ -44,14 +47,15 @@ Object {
   });
 
   test('string form composite', () => {
-    const presets = loadPresets({
+    const context = {
       siteConfig: {
         presets: [
           path.join(__dirname, '__fixtures__/preset-bar.js'),
           path.join(__dirname, '__fixtures__/preset-foo.js'),
         ],
       },
-    });
+    } as LoadContext;
+    const presets = loadPresets(context);
     expect(presets).toMatchInlineSnapshot(`
 Object {
   "plugins": Array [
@@ -78,11 +82,12 @@ Object {
   });
 
   test('array form', () => {
-    const presets = loadPresets({
+    const context = {
       siteConfig: {
         presets: [[path.join(__dirname, '__fixtures__/preset-bar.js')]],
       },
-    });
+    } as LoadContext;
+    const presets = loadPresets(context);
     expect(presets).toMatchInlineSnapshot(`
 Object {
   "plugins": Array [
@@ -101,7 +106,7 @@ Object {
   });
 
   test('array form with options', () => {
-    const presets = loadPresets({
+    const context = {
       siteConfig: {
         presets: [
           [
@@ -110,7 +115,8 @@ Object {
           ],
         ],
       },
-    });
+    } as LoadContext;
+    const presets = loadPresets(context);
     expect(presets).toMatchInlineSnapshot(`
 Object {
   "plugins": Array [
@@ -131,7 +137,7 @@ Object {
   });
 
   test('array form composite', () => {
-    const presets = loadPresets({
+    const context = {
       siteConfig: {
         presets: [
           [
@@ -144,7 +150,8 @@ Object {
           ],
         ],
       },
-    });
+    } as LoadContext;
+    const presets = loadPresets(context);
     expect(presets).toMatchInlineSnapshot(`
 Object {
   "plugins": Array [
@@ -175,7 +182,7 @@ Object {
   });
 
   test('mixed form', () => {
-    const presets = loadPresets({
+    const context = {
       siteConfig: {
         presets: [
           [
@@ -185,7 +192,8 @@ Object {
           path.join(__dirname, '__fixtures__/preset-foo.js'),
         ],
       },
-    });
+    } as LoadContext;
+    const presets = loadPresets(context);
     expect(presets).toMatchInlineSnapshot(`
 Object {
   "plugins": Array [
@@ -214,7 +222,7 @@ Object {
   });
 
   test('mixed form with themes', () => {
-    const presets = loadPresets({
+    const context = {
       siteConfig: {
         presets: [
           [
@@ -225,7 +233,8 @@ Object {
           path.join(__dirname, '__fixtures__/preset-qux.js'),
         ],
       },
-    });
+    } as LoadContext;
+    const presets = loadPresets(context);
     expect(presets).toMatchInlineSnapshot(`
 Object {
   "plugins": Array [
diff --git a/packages/docusaurus/src/server/load/presets.js b/packages/docusaurus/src/server/presets/index.ts
similarity index 72%
rename from packages/docusaurus/src/server/load/presets.js
rename to packages/docusaurus/src/server/presets/index.ts
index 9a3c8b9322..49c27034b6 100644
--- a/packages/docusaurus/src/server/load/presets.js
+++ b/packages/docusaurus/src/server/presets/index.ts
@@ -5,13 +5,14 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const importFresh = require('import-fresh');
-const _ = require('lodash');
+import importFresh from 'import-fresh';
+import _ from 'lodash';
+import {LoadContext} from '../index';
 
-module.exports = function loadPresets(context) {
-  const presets = context.siteConfig.presets || [];
-  const plugins = [];
-  const themes = [];
+export function loadPresets(context: LoadContext) {
+  const presets: any[] = context.siteConfig.presets || [];
+  const plugins: any[] = [];
+  const themes: any[] = [];
 
   presets.forEach(presetItem => {
     let presetModule;
@@ -31,4 +32,4 @@ module.exports = function loadPresets(context) {
     plugins: _.compact(_.flatten(plugins)),
     themes: _.compact(_.flatten(themes)),
   };
-};
+}
diff --git a/packages/docusaurus/src/server/load/routes.js b/packages/docusaurus/src/server/routes.ts
similarity index 79%
rename from packages/docusaurus/src/server/load/routes.js
rename to packages/docusaurus/src/server/routes.ts
index b29b91d6b1..16df0ab505 100644
--- a/packages/docusaurus/src/server/load/routes.js
+++ b/packages/docusaurus/src/server/routes.ts
@@ -5,17 +5,29 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const {genChunkName} = require('@docusaurus/utils');
-const {stringify} = require('querystring');
-const _ = require('lodash');
+import {genChunkName} from '@docusaurus/utils';
+import {stringify} from 'querystring';
+import _ from 'lodash';
 
-async function loadRoutes(pluginsRouteConfigs) {
+export interface RouteConfig {
+  path: string;
+  component: string;
+  modules?: {
+    [key: string]: any;
+  };
+  routes?: {
+    [route: string]: RouteConfig;
+  };
+  exact?: boolean;
+}
+
+export async function loadRoutes(pluginsRouteConfigs: RouteConfig[]) {
   const routesImports = [
     `import React from 'react';`,
     `import ComponentCreator from '@docusaurus/ComponentCreator';`,
   ];
-  const routesPaths = [];
-  const addRoutesPath = routePath => {
+  const routesPaths: string[] = [];
+  const addRoutesPath = (routePath: string) => {
     routesPaths.push(routePath);
   };
 
@@ -53,7 +65,7 @@ async function loadRoutes(pluginsRouteConfigs) {
         return null;
       }
 
-      const importStr = _.isObject(target) ? target.path : target;
+      const importStr = _.isObject(target as any) ? target.path : target;
       const queryStr = target.query ? `?${stringify(target.query)}` : '';
       return `${importStr}${queryStr}`;
     };
@@ -64,7 +76,11 @@ async function loadRoutes(pluginsRouteConfigs) {
 
     const componentPath = getModulePath(component);
 
-    const genImportChunk = (modulePath, prefix, name) => {
+    const genImportChunk = (
+      modulePath: string | null | undefined,
+      prefix?: string,
+      name?: string,
+    ) => {
       if (!modulePath) {
         return null;
       }
@@ -81,12 +97,12 @@ async function loadRoutes(pluginsRouteConfigs) {
     const componentChunk = genImportChunk(componentPath, 'component');
     addRoutesChunkNames(routePath, 'component', componentChunk);
 
-    function genRouteChunkNames(value, prefix) {
+    function genRouteChunkNames(value, prefix?: string) {
       if (Array.isArray(value)) {
-        return value.map(genRouteChunkNames);
+        return value.map((val, i) => genRouteChunkNames(val, `${i}`));
       }
 
-      if (_.isObject(value) && !value.__import) {
+      if (_.isObject(value as any) && !value.__import) {
         const newValue = {};
         Object.keys(value).forEach(key => {
           newValue[key] = genRouteChunkNames(value[key], key);
@@ -149,5 +165,3 @@ export default [
     routesPaths,
   };
 }
-
-module.exports = loadRoutes;
diff --git a/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-1/Footer/index.js b/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-1/Footer/index.js
new file mode 100644
index 0000000000..461f67a0a4
--- /dev/null
+++ b/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-1/Footer/index.js
@@ -0,0 +1 @@
+export default () => null;
diff --git a/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-1/Layout.js b/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-1/Layout.js
new file mode 100644
index 0000000000..461f67a0a4
--- /dev/null
+++ b/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-1/Layout.js
@@ -0,0 +1 @@
+export default () => null;
diff --git a/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-2/Layout/index.js b/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-2/Layout/index.js
new file mode 100644
index 0000000000..461f67a0a4
--- /dev/null
+++ b/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-2/Layout/index.js
@@ -0,0 +1 @@
+export default () => null;
diff --git a/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-2/Navbar.js b/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-2/Navbar.js
new file mode 100644
index 0000000000..461f67a0a4
--- /dev/null
+++ b/packages/docusaurus/src/server/themes/__tests__/__fixtures__/theme-2/Navbar.js
@@ -0,0 +1 @@
+export default () => null;
diff --git a/packages/docusaurus/src/server/themes/__tests__/alias.test.ts b/packages/docusaurus/src/server/themes/__tests__/alias.test.ts
new file mode 100644
index 0000000000..4bd870e2d0
--- /dev/null
+++ b/packages/docusaurus/src/server/themes/__tests__/alias.test.ts
@@ -0,0 +1,49 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import path from 'path';
+import fs from 'fs-extra';
+import {themeAlias} from '../alias';
+
+describe('themeAlias', () => {
+  test('valid themePath 1 with components', () => {
+    const fixtures = path.join(__dirname, '__fixtures__');
+    const themePath = path.join(fixtures, 'theme-1');
+    const alias = themeAlias(themePath);
+    expect(alias).toEqual({
+      '@theme/Footer': path.join(themePath, 'Footer/index.js'),
+      '@theme/Layout': path.join(themePath, 'Layout.js'),
+    });
+    expect(alias).not.toEqual({});
+  });
+
+  test('valid themePath 2 with components', () => {
+    const fixtures = path.join(__dirname, '__fixtures__');
+    const themePath = path.join(fixtures, 'theme-2');
+    const alias = themeAlias(themePath);
+    expect(alias).toEqual({
+      '@theme/Navbar': path.join(themePath, 'Navbar.js'),
+      '@theme/Layout': path.join(themePath, 'Layout/index.js'),
+    });
+    expect(alias).not.toEqual({});
+  });
+
+  test('valid themePath with no components', () => {
+    const fixtures = path.join(__dirname, '__fixtures__');
+    const themePath = path.join(fixtures, 'empty-theme');
+    fs.ensureDirSync(themePath);
+    const alias = themeAlias(themePath);
+    expect(alias).toEqual({});
+  });
+
+  test('invalid themePath that does not exist', () => {
+    const fixtures = path.join(__dirname, '__fixtures__');
+    const themePath = path.join(fixtures, '__noExist__');
+    const alias = themeAlias(themePath);
+    expect(alias).toEqual({});
+  });
+});
diff --git a/packages/docusaurus/src/server/themes/__tests__/index.ts b/packages/docusaurus/src/server/themes/__tests__/index.ts
new file mode 100644
index 0000000000..f3384efd30
--- /dev/null
+++ b/packages/docusaurus/src/server/themes/__tests__/index.ts
@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import path from 'path';
+import {loadThemeAlias} from '../index';
+
+describe('loadThemeAlias', () => {
+  test('next alias can override the previous alias', () => {
+    const fixtures = path.join(__dirname, '__fixtures__');
+    const theme1Path = path.join(fixtures, 'theme-1');
+    const theme2Path = path.join(fixtures, 'theme-2');
+
+    const alias = loadThemeAlias([theme1Path, theme2Path]);
+    expect(alias).toEqual({
+      '@theme/Footer': path.join(theme1Path, 'Footer/index.js'),
+      '@theme/Navbar': path.join(theme2Path, 'Navbar.js'),
+      '@theme/Layout': path.join(theme2Path, 'Layout/index.js'),
+    });
+    expect(alias).not.toEqual({});
+  });
+});
diff --git a/packages/docusaurus/src/server/load/theme.js b/packages/docusaurus/src/server/themes/alias.ts
similarity index 63%
rename from packages/docusaurus/src/server/load/theme.js
rename to packages/docusaurus/src/server/themes/alias.ts
index 5c2408373f..2435d90cb7 100644
--- a/packages/docusaurus/src/server/load/theme.js
+++ b/packages/docusaurus/src/server/themes/alias.ts
@@ -5,22 +5,25 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const globby = require('globby');
-const fs = require('fs-extra');
-const path = require('path');
-const {fileToPath, posixPath, normalizeUrl} = require('@docusaurus/utils');
+import globby from 'globby';
+import fs from 'fs-extra';
+import path from 'path';
+import {fileToPath, posixPath, normalizeUrl} from '@docusaurus/utils';
 
-module.exports = async function loadTheme(themePath) {
+export interface Alias {
+  [alias: string]: string;
+}
+
+export function themeAlias(themePath: string): Alias {
   if (!fs.pathExistsSync(themePath)) {
-    return null;
+    return {};
   }
 
-  const themeComponentFiles = await globby(['**/*.{js,jsx}'], {
+  const themeComponentFiles = globby.sync(['**/*.{js,jsx}'], {
     cwd: themePath,
   });
 
   const alias = {};
-
   themeComponentFiles.forEach(relativeSource => {
     const filePath = path.join(themePath, relativeSource);
     const fileName = fileToPath(relativeSource);
@@ -31,4 +34,4 @@ module.exports = async function loadTheme(themePath) {
   });
 
   return alias;
-};
+}
diff --git a/packages/docusaurus/src/server/themes/index.ts b/packages/docusaurus/src/server/themes/index.ts
new file mode 100644
index 0000000000..553ec1cfb2
--- /dev/null
+++ b/packages/docusaurus/src/server/themes/index.ts
@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import {themeAlias, Alias} from './alias';
+
+export {Alias} from './alias';
+
+export function loadThemeAlias(themePaths: string[]): Alias {
+  return themePaths.reduce(
+    (alias, themePath) => ({
+      ...alias,
+      ...themeAlias(themePath),
+    }),
+    {},
+  );
+}
diff --git a/packages/docusaurus/src/webpack/__tests__/base.test.js b/packages/docusaurus/src/webpack/__tests__/base.test.js
deleted file mode 100644
index c1d526b3fa..0000000000
--- a/packages/docusaurus/src/webpack/__tests__/base.test.js
+++ /dev/null
@@ -1,28 +0,0 @@
-/**
- * Copyright (c) 2017-present, Facebook, Inc.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-import {validate} from 'webpack';
-import createBaseConfig from '../base';
-import loadSetup from '../../server/load/loadSetup';
-
-describe('webpack base config', () => {
-  test('simple', async () => {
-    console.log = jest.fn();
-    const props = await loadSetup('simple');
-    const config = createBaseConfig(props);
-    const errors = validate(config);
-    expect(errors.length).toBe(0);
-  });
-
-  test('custom', async () => {
-    console.log = jest.fn();
-    const props = await loadSetup('custom');
-    const config = createBaseConfig(props);
-    const errors = validate(config);
-    expect(errors.length).toBe(0);
-  });
-});
diff --git a/packages/docusaurus/src/webpack/__tests__/client.test.js b/packages/docusaurus/src/webpack/__tests__/client.test.ts
similarity index 88%
rename from packages/docusaurus/src/webpack/__tests__/client.test.js
rename to packages/docusaurus/src/webpack/__tests__/client.test.ts
index 607dee4a56..97970b3c8c 100644
--- a/packages/docusaurus/src/webpack/__tests__/client.test.js
+++ b/packages/docusaurus/src/webpack/__tests__/client.test.ts
@@ -7,8 +7,8 @@
 
 import {validate} from 'webpack';
 
-import createClientConfig from '../client';
-import loadSetup from '../../server/load/loadSetup';
+import {createClientConfig} from '../client';
+import {loadSetup} from '../../server/loadSetup';
 
 describe('webpack dev config', () => {
   test('simple', async () => {
diff --git a/packages/docusaurus/src/webpack/__tests__/server.test.js b/packages/docusaurus/src/webpack/__tests__/server.test.ts
similarity index 88%
rename from packages/docusaurus/src/webpack/__tests__/server.test.js
rename to packages/docusaurus/src/webpack/__tests__/server.test.ts
index e68b6b2eb4..f9478a2412 100644
--- a/packages/docusaurus/src/webpack/__tests__/server.test.js
+++ b/packages/docusaurus/src/webpack/__tests__/server.test.ts
@@ -7,8 +7,8 @@
 
 import {validate} from 'webpack';
 
-import createServerConfig from '../server';
-import loadSetup from '../../server/load/loadSetup';
+import {createServerConfig} from '../server';
+import {loadSetup} from '../../server/loadSetup';
 
 describe('webpack production config', () => {
   test('simple', async () => {
diff --git a/packages/docusaurus/src/webpack/__tests__/utils.test.js b/packages/docusaurus/src/webpack/__tests__/utils.test.ts
similarity index 100%
rename from packages/docusaurus/src/webpack/__tests__/utils.test.js
rename to packages/docusaurus/src/webpack/__tests__/utils.test.ts
diff --git a/packages/docusaurus/src/webpack/base.js b/packages/docusaurus/src/webpack/base.ts
similarity index 89%
rename from packages/docusaurus/src/webpack/base.js
rename to packages/docusaurus/src/webpack/base.ts
index 7feb080780..df8ea05f16 100644
--- a/packages/docusaurus/src/webpack/base.js
+++ b/packages/docusaurus/src/webpack/base.ts
@@ -5,16 +5,21 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const MiniCssExtractPlugin = require('mini-css-extract-plugin');
-const TerserPlugin = require('terser-webpack-plugin');
-const path = require('path');
-const fs = require('fs-extra');
-const {getBabelLoader, getCacheLoader, getStyleLoaders} = require('./utils');
+import MiniCssExtractPlugin from 'mini-css-extract-plugin';
+import TerserPlugin from 'terser-webpack-plugin';
+import path from 'path';
+import fs from 'fs-extra';
+import {Configuration} from 'webpack';
+import {getBabelLoader, getCacheLoader, getStyleLoaders} from './utils';
+import {Props} from '../server';
 
 const CSS_REGEX = /\.css$/;
 const CSS_MODULE_REGEX = /\.module\.css$/;
 
-module.exports = function createBaseConfig(props, isServer) {
+export function createBaseConfig(
+  props: Props,
+  isServer: Boolean,
+): Configuration {
   const {
     outDir,
     siteDir,
@@ -96,7 +101,7 @@ module.exports = function createBaseConfig(props, isServer) {
       rules: [
         {
           test: /\.jsx?$/,
-          exclude(modulePath) {
+          exclude: modulePath => {
             // Don't transpile node_modules except any docusaurus package
             return (
               /node_modules/.test(modulePath) && !/docusaurus/.test(modulePath)
@@ -137,4 +142,4 @@ module.exports = function createBaseConfig(props, isServer) {
       }),
     ],
   };
-};
+}
diff --git a/packages/docusaurus/src/webpack/client.js b/packages/docusaurus/src/webpack/client.ts
similarity index 71%
rename from packages/docusaurus/src/webpack/client.js
rename to packages/docusaurus/src/webpack/client.ts
index a6ba37ce4a..079bc3c407 100644
--- a/packages/docusaurus/src/webpack/client.js
+++ b/packages/docusaurus/src/webpack/client.ts
@@ -4,16 +4,18 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  */
-const path = require('path');
-const WebpackNiceLog = require('webpack-nicelog');
-const merge = require('webpack-merge');
-const ChunkManifestPlugin = require('./plugins/ChunkManifestPlugin');
+import path from 'path';
+import {Configuration} from 'webpack';
+import WebpackNiceLog from 'webpack-nicelog';
+import merge from 'webpack-merge';
+import ChunkManifestPlugin from './plugins/ChunkManifestPlugin';
 
-const createBaseConfig = require('./base');
+import {createBaseConfig} from './base';
+import {Props} from '../server';
 
-module.exports = function createClientConfig(props) {
+export function createClientConfig(props: Props): Configuration {
   const isProd = process.env.NODE_ENV === 'production';
-  const config = createBaseConfig(props);
+  const config = createBaseConfig(props, false);
 
   const clientConfig = merge(config, {
     entry: {
@@ -40,4 +42,4 @@ module.exports = function createClientConfig(props) {
   });
 
   return clientConfig;
-};
+}
diff --git a/packages/docusaurus/src/webpack/plugins/ChunkManifestPlugin.js b/packages/docusaurus/src/webpack/plugins/ChunkManifestPlugin.js
index 336cb9177b..607ee9c80e 100644
--- a/packages/docusaurus/src/webpack/plugins/ChunkManifestPlugin.js
+++ b/packages/docusaurus/src/webpack/plugins/ChunkManifestPlugin.js
@@ -4,12 +4,13 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  */
-const HtmlWebpackPlugin = require('html-webpack-plugin');
 
-const pluginName = 'ChunkManifestPlugin';
+const HtmlWebpackPlugin = require('html-webpack-plugin');
 const fs = require('fs-extra');
 const path = require('path');
 
+const pluginName = 'ChunkManifestPlugin';
+
 class ChunkManifestPlugin {
   constructor(options) {
     this.options = {
diff --git a/packages/docusaurus/src/webpack/server.js b/packages/docusaurus/src/webpack/server.ts
similarity index 79%
rename from packages/docusaurus/src/webpack/server.js
rename to packages/docusaurus/src/webpack/server.ts
index 1a8211a1b0..0890363bf0 100644
--- a/packages/docusaurus/src/webpack/server.js
+++ b/packages/docusaurus/src/webpack/server.ts
@@ -5,14 +5,17 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const path = require('path');
-const StaticSiteGeneratorPlugin = require('static-site-generator-webpack-plugin');
-const WebpackNiceLog = require('webpack-nicelog');
-const merge = require('webpack-merge');
-const createBaseConfig = require('./base');
-const WaitPlugin = require('./plugins/WaitPlugin');
+import path from 'path';
+import StaticSiteGeneratorPlugin from 'static-site-generator-webpack-plugin';
+import WebpackNiceLog from 'webpack-nicelog';
+import merge from 'webpack-merge';
+import {Configuration} from 'webpack';
 
-module.exports = function createServerConfig(props) {
+import {createBaseConfig} from './base';
+import WaitPlugin from './plugins/WaitPlugin';
+import {Props} from '../server';
+
+export function createServerConfig(props: Props): Configuration {
   const {baseUrl, routesPaths, outDir} = props;
   const config = createBaseConfig(props, true);
   const isProd = process.env.NODE_ENV === 'production';
@@ -62,4 +65,4 @@ module.exports = function createServerConfig(props) {
     ],
   });
   return serverConfig;
-};
+}
diff --git a/packages/docusaurus/src/webpack/utils.js b/packages/docusaurus/src/webpack/utils.ts
similarity index 75%
rename from packages/docusaurus/src/webpack/utils.js
rename to packages/docusaurus/src/webpack/utils.ts
index df168db5b1..8066094d2d 100644
--- a/packages/docusaurus/src/webpack/utils.js
+++ b/packages/docusaurus/src/webpack/utils.ts
@@ -5,14 +5,20 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-const MiniCssExtractPlugin = require('mini-css-extract-plugin');
-const cacheLoaderVersion = require('cache-loader/package.json').version;
-const merge = require('webpack-merge');
+import MiniCssExtractPlugin from 'mini-css-extract-plugin';
+import merge from 'webpack-merge';
+import {Configuration, Loader} from 'webpack';
+
+import {version as cacheLoaderVersion} from 'cache-loader/package.json';
 
 // Utility method to get style loaders
-function getStyleLoaders(isServer, cssOptions = {}) {
+export function getStyleLoaders(
+  isServer: Boolean,
+  cssOptions: {
+    [key: string]: any;
+  } = {},
+): Loader[] {
   if (isServer) {
-    // https://github.com/webpack-contrib/mini-css-extract-plugin/issues/90#issuecomment-380796867
     return [
       cssOptions.modules
         ? {
@@ -33,11 +39,11 @@ function getStyleLoaders(isServer, cssOptions = {}) {
       loader: require.resolve('css-loader'),
       options: cssOptions,
     },
-  ].filter(Boolean);
+  ].filter(Boolean) as Loader[];
   return loaders;
 }
 
-function getCacheLoader(isServer, cacheOptions) {
+export function getCacheLoader(isServer: Boolean, cacheOptions?: {}): Loader {
   return {
     loader: require.resolve('cache-loader'),
     options: Object.assign(
@@ -49,7 +55,7 @@ function getCacheLoader(isServer, cacheOptions) {
   };
 }
 
-function getBabelLoader(isServer, babelOptions) {
+export function getBabelLoader(isServer: Boolean, babelOptions?: {}): Loader {
   return {
     loader: require.resolve('babel-loader'),
     options: Object.assign(
@@ -73,7 +79,11 @@ function getBabelLoader(isServer, babelOptions) {
  * @param {Boolean} isServer indicates if this is a server webpack configuration
  * @returns {Object} final/ modified webpack config
  */
-function applyConfigureWebpack(configureWebpack, config, isServer) {
+export function applyConfigureWebpack(
+  configureWebpack: any,
+  config: Configuration,
+  isServer: Boolean,
+): Configuration {
   if (typeof configureWebpack === 'object') {
     return merge(config, configureWebpack);
   }
@@ -92,10 +102,3 @@ function applyConfigureWebpack(configureWebpack, config, isServer) {
   }
   return config;
 }
-
-module.exports = {
-  getBabelLoader,
-  getCacheLoader,
-  getStyleLoaders,
-  applyConfigureWebpack,
-};
diff --git a/packages/docusaurus/tsconfig.json b/packages/docusaurus/tsconfig.json
new file mode 100644
index 0000000000..4ee1e200df
--- /dev/null
+++ b/packages/docusaurus/tsconfig.json
@@ -0,0 +1,10 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "incremental": true,
+    "tsBuildInfoFile": "./lib/.tsbuildinfo",
+    "rootDir": "src",
+    "outDir": "lib",
+    "noImplicitAny": false,
+  },
+}
diff --git a/tsconfig.json b/tsconfig.json
index 13e74202f8..54d3a54bf7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,10 +4,10 @@
     "module": "commonjs",
     "lib": ["es6"],
     "declaration": true,
+    "declarationMap": true,
 
     /* Strict Type-Checking Options */
     "strict": true,
-    "noImplicitAny": true,
     "strictNullChecks": true,
     "strictFunctionTypes": true,
     "strictBindCallApply": true,
@@ -25,13 +25,9 @@
     "moduleResolution": "node",
     "allowSyntheticDefaultImports": true,
     "esModuleInterop": true,
- 
+
     /* Advanced Options */
     "resolveJsonModule": true
   },
-  "exclude": [
-    "node_modules",
-    "**/__tests__/**/*",
-    "**/lib/**/*",
-  ]
+  "exclude": ["node_modules", "**/__tests__/**/*", "**/lib/**/*"]
 }
diff --git a/yarn.lock b/yarn.lock
index 42a669aa53..6742f52b64 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1790,6 +1790,11 @@
   resolved "https://registry.yarnpkg.com/@sindresorhus/is/-/is-0.7.0.tgz#9a06f4f137ee84d7df0460c1fdb1135ffa6c50fd"
   integrity sha512-ONhaKPIufzzrlNbqtWFFd+jlnemX6lJAgq9ZeiZtS7I1PIf/la7CW4m83rTXRnVnsMbW2k56pGYu7AUFJD9Pow==
 
+"@types/anymatch@*":
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/@types/anymatch/-/anymatch-1.3.1.tgz#336badc1beecb9dacc38bea2cf32adf627a8421a"
+  integrity sha512-/+CRPXpBDpo2RK9C68N3b2cOvO0Cf5B9aPijHsoDQTHivnGSObdOF2BRQOYjojWTDy6nQvMjmqRXIxH55VjxxA==
+
 "@types/babel__core@^7.1.0":
   version "7.1.1"
   resolved "https://registry.yarnpkg.com/@types/babel__core/-/babel__core-7.1.1.tgz#ce9a9e5d92b7031421e1d0d74ae59f572ba48be6"
@@ -1823,6 +1828,21 @@
   dependencies:
     "@babel/types" "^7.3.0"
 
+"@types/body-parser@*":
+  version "1.17.0"
+  resolved "https://registry.yarnpkg.com/@types/body-parser/-/body-parser-1.17.0.tgz#9f5c9d9bd04bb54be32d5eb9fc0d8c974e6cf58c"
+  integrity sha512-a2+YeUjPkztKJu5aIF2yArYFQQp8d51wZ7DavSHjFuY1mqVgidGyzEQ41JIVNy82fXj8yPgy2vJmfIywgESW6w==
+  dependencies:
+    "@types/connect" "*"
+    "@types/node" "*"
+
+"@types/chalk@^2.2.0":
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/@types/chalk/-/chalk-2.2.0.tgz#b7f6e446f4511029ee8e3f43075fb5b73fbaa0ba"
+  integrity sha512-1zzPV9FDe1I/WHhRkf9SNgqtRJWZqrBWgu7JGveuHmmyR9CnAPCie2N/x+iHrgnpYBIcCJWHBoMRv2TRWktsvw==
+  dependencies:
+    chalk "*"
+
 "@types/cheerio@^0.22.8":
   version "0.22.11"
   resolved "https://registry.yarnpkg.com/@types/cheerio/-/cheerio-0.22.11.tgz#61c0facf9636d14ba5f77fc65ed8913aa845d717"
@@ -1830,6 +1850,13 @@
   dependencies:
     "@types/node" "*"
 
+"@types/connect@*":
+  version "3.4.32"
+  resolved "https://registry.yarnpkg.com/@types/connect/-/connect-3.4.32.tgz#aa0e9616b9435ccad02bc52b5b454ffc2c70ba28"
+  integrity sha512-4r8qa0quOvh7lGD0pre62CAb1oni1OO6ecJLGCezTmhQ8Fz50Arx9RUszryR8KlgK6avuSXvviL6yWyViQABOg==
+  dependencies:
+    "@types/node" "*"
+
 "@types/escape-string-regexp@^1.0.0":
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/@types/escape-string-regexp/-/escape-string-regexp-1.0.0.tgz#052d16d87db583b72daceae4eaabddb66954424c"
@@ -1840,6 +1867,23 @@
   resolved "https://registry.yarnpkg.com/@types/events/-/events-3.0.0.tgz#2862f3f58a9a7f7c3e78d79f130dd4d71c25c2a7"
   integrity sha512-EaObqwIvayI5a8dCzhFrjKzVwKLxjoG9T6Ppd5CEo07LRKfQ8Yokw54r5+Wq7FaBQ+yXRvQAYPrHwya1/UFt9g==
 
+"@types/express-serve-static-core@*":
+  version "4.16.4"
+  resolved "https://registry.yarnpkg.com/@types/express-serve-static-core/-/express-serve-static-core-4.16.4.tgz#56bb8be4559401d68af4a3624ae9dd3166103e60"
+  integrity sha512-x/8h6FHm14rPWnW2HP5likD/rsqJ3t/77OWx2PLxym0hXbeBWQmcPyHmwX+CtCQpjIfgrUdEoDFcLPwPZWiqzQ==
+  dependencies:
+    "@types/node" "*"
+    "@types/range-parser" "*"
+
+"@types/express@^4.16.1":
+  version "4.16.1"
+  resolved "https://registry.yarnpkg.com/@types/express/-/express-4.16.1.tgz#d756bd1a85c34d87eaf44c888bad27ba8a4b7cf0"
+  integrity sha512-V0clmJow23WeyblmACoxbHBu2JKlE5TiIme6Lem14FnPW9gsttyHtk6wq7njcdIWH1njAaFgR8gW09lgY98gQg==
+  dependencies:
+    "@types/body-parser" "*"
+    "@types/express-serve-static-core" "*"
+    "@types/serve-static" "*"
+
 "@types/fs-extra@7.0.0":
   version "7.0.0"
   resolved "https://registry.yarnpkg.com/@types/fs-extra/-/fs-extra-7.0.0.tgz#9c4ad9e1339e7448a76698829def1f159c1b636c"
@@ -1856,6 +1900,13 @@
     "@types/minimatch" "*"
     "@types/node" "*"
 
+"@types/globby@9.1.0":
+  version "9.1.0"
+  resolved "https://registry.yarnpkg.com/@types/globby/-/globby-9.1.0.tgz#08e2cf99c64f8e45c6cfbe05e9d8ac763aca6482"
+  integrity sha512-9du/HCA71EBz7syHRnM4Q/u4Fbx3SyN/Uu+4Of9lyPX4A6Xi+A8VMxvx8j5/CMTfrae2Zwdwg0fAaKvKXfRbAw==
+  dependencies:
+    globby "*"
+
 "@types/istanbul-lib-coverage@*", "@types/istanbul-lib-coverage@^2.0.0":
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz#42995b446db9a48a11a07ec083499a860e9138ff"
@@ -1893,6 +1944,11 @@
   resolved "https://registry.yarnpkg.com/@types/lodash/-/lodash-4.14.129.tgz#9aaca391db126802482655c48dd79a814488202f"
   integrity sha512-oYaV0eSlnOacOr7i4X1FFdH8ttSlb57gu3I9MuStIv2CYkISEY84dNHYsC3bF6sNH7qYcu1BtVrCtQ8Q4KPTfQ==
 
+"@types/mime@*":
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/@types/mime/-/mime-2.0.1.tgz#dc488842312a7f075149312905b5e3c0b054c79d"
+  integrity sha512-FwI9gX75FgVBJ7ywgnq/P7tw+/o1GUbtP0KzbtusLigAOgIgNISRK0ZPl4qertvXSIE8YbsVJueQ90cDt9YYyw==
+
 "@types/minimatch@*":
   version "3.0.3"
   resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.3.tgz#3dca0e3f33b200fc7d1139c0cd96c1268cadfd9d"
@@ -1913,11 +1969,44 @@
   resolved "https://registry.yarnpkg.com/@types/q/-/q-1.5.2.tgz#690a1475b84f2a884fd07cd797c00f5f31356ea8"
   integrity sha512-ce5d3q03Ex0sy4R14722Rmt6MT07Ua+k4FwDfdcToYJcMKNtRVQvJ6JCAPdAmAnbRb6CsX6aYb9m96NGod9uTw==
 
+"@types/range-parser@*":
+  version "1.2.3"
+  resolved "https://registry.yarnpkg.com/@types/range-parser/-/range-parser-1.2.3.tgz#7ee330ba7caafb98090bece86a5ee44115904c2c"
+  integrity sha512-ewFXqrQHlFsgc09MK5jP5iR7vumV/BYayNC6PgJO2LPe8vrnNFyjQjSppfEngITi0qvfKtzFvgKymGheFM9UOA==
+
+"@types/serve-static@*":
+  version "1.13.2"
+  resolved "https://registry.yarnpkg.com/@types/serve-static/-/serve-static-1.13.2.tgz#f5ac4d7a6420a99a6a45af4719f4dcd8cd907a48"
+  integrity sha512-/BZ4QRLpH/bNYgZgwhKEh+5AsboDBcUdlBYgzoLX0fpj3Y2gp6EApyOlM3bK53wQS/OE1SrdSYBAbux2D1528Q==
+  dependencies:
+    "@types/express-serve-static-core" "*"
+    "@types/mime" "*"
+
+"@types/shelljs@^0.8.5":
+  version "0.8.5"
+  resolved "https://registry.yarnpkg.com/@types/shelljs/-/shelljs-0.8.5.tgz#1e507b2f6d1f893269bd3e851ec24419ef9beeea"
+  integrity sha512-bZgjwIWu9gHCjirKJoOlLzGi5N0QgZ5t7EXEuoqyWCHTuSddURXo3FOBYDyRPNOWzZ6NbkLvZnVkn483Y/tvcQ==
+  dependencies:
+    "@types/glob" "*"
+    "@types/node" "*"
+
 "@types/stack-utils@^1.0.1":
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-1.0.1.tgz#0a851d3bd96498fa25c33ab7278ed3bd65f06c3e"
   integrity sha512-l42BggppR6zLmpfU6fq9HEa2oGPEI8yrSPL3GITjfRInppYFahObbIQOQK3UGxEnyQpltZLaPe75046NOZQikw==
 
+"@types/tapable@*":
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/@types/tapable/-/tapable-1.0.4.tgz#b4ffc7dc97b498c969b360a41eee247f82616370"
+  integrity sha512-78AdXtlhpCHT0K3EytMpn4JNxaf5tbqbLcbIRoQIHzpTIyjpxLQKRoxU55ujBXAtg3Nl2h/XWvfDa9dsMOd0pQ==
+
+"@types/uglify-js@*":
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/@types/uglify-js/-/uglify-js-3.0.4.tgz#96beae23df6f561862a830b4288a49e86baac082"
+  integrity sha512-SudIN9TRJ+v8g5pTG8RRCqfqTMNqgWCKKd3vtynhGzkIIjxaicNAMuY5TRadJ6tzDu3Dotf3ngaMILtmOdmWEQ==
+  dependencies:
+    source-map "^0.6.1"
+
 "@types/unist@*", "@types/unist@^2.0.0":
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/@types/unist/-/unist-2.0.3.tgz#9c088679876f374eb5983f150d4787aa6fb32d7e"
@@ -1940,6 +2029,24 @@
     "@types/unist" "*"
     "@types/vfile-message" "*"
 
+"@types/webpack-merge@^4.1.5":
+  version "4.1.5"
+  resolved "https://registry.yarnpkg.com/@types/webpack-merge/-/webpack-merge-4.1.5.tgz#265fbee4810474860d0f4c17e0107032881eed47"
+  integrity sha512-cbDo592ljSHeaVe5Q39JKN6Z4vMhmo4+C3JbksOIg+kjhKQYN2keGN7dvr/i18+dughij98Qrsfn1mU9NgVoCA==
+  dependencies:
+    "@types/webpack" "*"
+
+"@types/webpack@*", "@types/webpack@^4.4.31":
+  version "4.4.31"
+  resolved "https://registry.yarnpkg.com/@types/webpack/-/webpack-4.4.31.tgz#f59b9d8210cf4d2fd254fe6d1f5ba86e557867f5"
+  integrity sha512-WNALmv/wxy2+OoF7A5GD8BVotXnkuMHlojVWKj/neFHU3Ut2Azbu1A7Yi2Vr6eX3z+31XgR/dJ5NpX4pQZ7ieQ==
+  dependencies:
+    "@types/anymatch" "*"
+    "@types/node" "*"
+    "@types/tapable" "*"
+    "@types/uglify-js" "*"
+    source-map "^0.6.0"
+
 "@types/yargs@^12.0.2", "@types/yargs@^12.0.9":
   version "12.0.12"
   resolved "https://registry.yarnpkg.com/@types/yargs/-/yargs-12.0.12.tgz#45dd1d0638e8c8f153e87d296907659296873916"
@@ -3375,6 +3482,15 @@ ccount@^1.0.0, ccount@^1.0.3:
   resolved "https://registry.yarnpkg.com/ccount/-/ccount-1.0.4.tgz#9cf2de494ca84060a2a8d2854edd6dfb0445f386"
   integrity sha512-fpZ81yYfzentuieinmGnphk0pLkOTMm6MZdVqwd77ROvhko6iujLNGrHH5E7utq3ygWklwfmwuG+A7P+NpqT6w==
 
+chalk@*, chalk@2.4.2, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.1, chalk@^2.3.2, 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==
+  dependencies:
+    ansi-styles "^3.2.1"
+    escape-string-regexp "^1.0.5"
+    supports-color "^5.3.0"
+
 chalk@1.1.3, chalk@^1.0.0, chalk@^1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
@@ -3386,15 +3502,6 @@ chalk@1.1.3, chalk@^1.0.0, chalk@^1.1.3:
     strip-ansi "^3.0.0"
     supports-color "^2.0.0"
 
-chalk@2.4.2, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.1.0, chalk@^2.3.1, chalk@^2.3.2, 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==
-  dependencies:
-    ansi-styles "^3.2.1"
-    escape-string-regexp "^1.0.5"
-    supports-color "^5.3.0"
-
 change-case@^3.0.2:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/change-case/-/change-case-3.1.0.tgz#0e611b7edc9952df2e8513b27b42de72647dd17e"
@@ -6431,6 +6538,20 @@ globals@^11.0.1, globals@^11.1.0:
   resolved "https://registry.yarnpkg.com/globals/-/globals-11.12.0.tgz#ab8795338868a0babd8525758018c2a7eb95c42e"
   integrity sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==
 
+globby@*, globby@^9.1.0:
+  version "9.2.0"
+  resolved "https://registry.yarnpkg.com/globby/-/globby-9.2.0.tgz#fd029a706c703d29bdd170f4b6db3a3f7a7cb63d"
+  integrity sha512-ollPHROa5mcxDEkwg6bPt3QbEf4pDQSNtd6JPL1YvOvAo/7/0VAm9TccUeoTmarjPw4pfUthSCqcyfNB1I3ZSg==
+  dependencies:
+    "@types/glob" "^7.1.1"
+    array-union "^1.0.2"
+    dir-glob "^2.2.2"
+    fast-glob "^2.2.6"
+    glob "^7.1.3"
+    ignore "^4.0.3"
+    pify "^4.0.1"
+    slash "^2.0.0"
+
 globby@8.0.2, globby@^8.0.1:
   version "8.0.2"
   resolved "https://registry.yarnpkg.com/globby/-/globby-8.0.2.tgz#5697619ccd95c5275dbb2d6faa42087c1a941d8d"
@@ -6455,20 +6576,6 @@ globby@^6.1.0:
     pify "^2.0.0"
     pinkie-promise "^2.0.0"
 
-globby@^9.1.0:
-  version "9.2.0"
-  resolved "https://registry.yarnpkg.com/globby/-/globby-9.2.0.tgz#fd029a706c703d29bdd170f4b6db3a3f7a7cb63d"
-  integrity sha512-ollPHROa5mcxDEkwg6bPt3QbEf4pDQSNtd6JPL1YvOvAo/7/0VAm9TccUeoTmarjPw4pfUthSCqcyfNB1I3ZSg==
-  dependencies:
-    "@types/glob" "^7.1.1"
-    array-union "^1.0.2"
-    dir-glob "^2.2.2"
-    fast-glob "^2.2.6"
-    glob "^7.1.3"
-    ignore "^4.0.3"
-    pify "^4.0.1"
-    slash "^2.0.0"
-
 globule@^1.0.0:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/globule/-/globule-1.2.1.tgz#5dffb1b191f22d20797a9369b49eab4e9839696d"
@@ -13609,10 +13716,10 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
-typescript@^3.4.5:
-  version "3.4.5"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.4.5.tgz#2d2618d10bb566572b8d7aad5180d84257d70a99"
-  integrity sha512-YycBxUb49UUhdNMU5aJ7z5Ej2XGmaIBL0x34vZ82fn3hGvD+bgrMrVDpatgz2f7YxUMJxMkbWxJZeAvDxVe7Vw==
+typescript@^3.5.0-rc:
+  version "3.5.0-rc"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.5.0-rc.tgz#6f1ada90c15427713f8c0f4550ef7d357ac2a5f1"
+  integrity sha512-8Os3bqTeHc6bf+bkPFL3O/pb09j8SbDa2LUBxTXWpZlcHUW9ziGuiEFiqMcArkbAjGLqEzshkl4zvxhb0gVPuQ==
 
 ua-parser-js@^0.7.18:
   version "0.7.19"