diff --git a/packages/docusaurus-mdx-loader/src/types.d.ts b/packages/docusaurus-mdx-loader/src/types.d.ts
index be027f7702..0f2b0dae9d 100644
--- a/packages/docusaurus-mdx-loader/src/types.d.ts
+++ b/packages/docusaurus-mdx-loader/src/types.d.ts
@@ -9,12 +9,12 @@ declare module '@docusaurus/mdx-loader' {
   type RemarkOrRehypePlugin =
     // eslint-disable-next-line @typescript-eslint/ban-types
     [Function, Record<string, unknown>] | Function;
-  export interface RemarkAndRehypePluginOptions {
+  export type RemarkAndRehypePluginOptions = {
     remarkPlugins: RemarkOrRehypePlugin[];
     rehypePlugins: string[];
     beforeDefaultRemarkPlugins: RemarkOrRehypePlugin[];
     beforeDefaultRehypePlugins: RemarkOrRehypePlugin[];
-  }
+  };
 }
 
 // TODO Types provided by MDX 2.0 https://github.com/mdx-js/mdx/blob/main/packages/mdx/types/index.d.ts
diff --git a/packages/docusaurus-plugin-content-blog/src/types.ts b/packages/docusaurus-plugin-content-blog/src/types.ts
index 7c2e7b900c..1f362b52b7 100644
--- a/packages/docusaurus-plugin-content-blog/src/types.ts
+++ b/packages/docusaurus-plugin-content-blog/src/types.ts
@@ -31,7 +31,7 @@ export type EditUrlFunction = (editUrlParams: {
   locale: string;
 }) => string | undefined;
 
-export interface PluginOptions extends RemarkAndRehypePluginOptions {
+export type PluginOptions = RemarkAndRehypePluginOptions & {
   id?: string;
   path: string;
   routeBasePath: string;
@@ -61,7 +61,7 @@ export interface PluginOptions extends RemarkAndRehypePluginOptions {
   editLocalizedFiles?: boolean;
   admonitions: Record<string, unknown>;
   authorsMapPath: string;
-}
+};
 
 export interface BlogTags {
   [key: string]: BlogTag;
diff --git a/packages/docusaurus-plugin-content-pages/src/types.ts b/packages/docusaurus-plugin-content-pages/src/types.ts
index b7107c91b8..7059cb13b6 100644
--- a/packages/docusaurus-plugin-content-pages/src/types.ts
+++ b/packages/docusaurus-plugin-content-pages/src/types.ts
@@ -7,7 +7,7 @@
 
 import type {RemarkAndRehypePluginOptions} from '@docusaurus/mdx-loader';
 
-export interface PluginOptions extends RemarkAndRehypePluginOptions {
+export type PluginOptions = RemarkAndRehypePluginOptions & {
   id?: string;
   path: string;
   routeBasePath: string;
@@ -15,7 +15,7 @@ export interface PluginOptions extends RemarkAndRehypePluginOptions {
   exclude: string[];
   mdxPageComponent: string;
   admonitions: Record<string, unknown>;
-}
+};
 
 export type JSXPageMetadata = {
   type: 'jsx';
diff --git a/packages/docusaurus-plugin-sitemap/src/types.ts b/packages/docusaurus-plugin-sitemap/src/types.ts
index 9de46cf3b1..98853b364d 100644
--- a/packages/docusaurus-plugin-sitemap/src/types.ts
+++ b/packages/docusaurus-plugin-sitemap/src/types.ts
@@ -7,8 +7,8 @@
 
 import {EnumChangefreq} from 'sitemap';
 
-export interface PluginOptions {
+export type PluginOptions = {
   changefreq?: EnumChangefreq;
   priority?: number;
   trailingSlash?: boolean;
-}
+};
diff --git a/packages/docusaurus-preset-classic/package.json b/packages/docusaurus-preset-classic/package.json
index a116ba5055..fadc5298d1 100644
--- a/packages/docusaurus-preset-classic/package.json
+++ b/packages/docusaurus-preset-classic/package.json
@@ -2,8 +2,12 @@
   "name": "@docusaurus/preset-classic",
   "version": "2.0.0-beta.6",
   "description": "Classic preset for Docusaurus.",
-  "main": "src/index.js",
+  "main": "lib/index.js",
   "types": "src/preset-classic.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "watch": "tsc --watch"
+  },
   "publishConfig": {
     "access": "public"
   },
diff --git a/packages/docusaurus-preset-classic/src/index.js b/packages/docusaurus-preset-classic/src/index.js
deleted file mode 100644
index 49d55cea94..0000000000
--- a/packages/docusaurus-preset-classic/src/index.js
+++ /dev/null
@@ -1,48 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-module.exports = function preset(context, opts = {}) {
-  const {siteConfig} = context;
-  const {themeConfig} = siteConfig;
-  const {algolia, googleAnalytics, gtag} = themeConfig;
-  const isProd = process.env.NODE_ENV === 'production';
-
-  const debug =
-    typeof opts.debug !== 'undefined' ? Boolean(opts.debug) : !isProd;
-
-  return {
-    themes: [
-      [require.resolve('@docusaurus/theme-classic'), opts.theme],
-      // Don't add this if algolia config is not defined.
-      algolia && require.resolve('@docusaurus/theme-search-algolia'),
-    ],
-    plugins: [
-      opts.docs !== false && [
-        require.resolve('@docusaurus/plugin-content-docs'),
-        opts.docs,
-      ],
-      opts.blog !== false && [
-        require.resolve('@docusaurus/plugin-content-blog'),
-        opts.blog,
-      ],
-      opts.pages !== false && [
-        require.resolve('@docusaurus/plugin-content-pages'),
-        opts.pages,
-      ],
-      isProd &&
-        googleAnalytics &&
-        require.resolve('@docusaurus/plugin-google-analytics'),
-      debug && require.resolve('@docusaurus/plugin-debug'),
-      isProd && gtag && require.resolve('@docusaurus/plugin-google-gtag'),
-      isProd &&
-        opts.sitemap !== false && [
-          require.resolve('@docusaurus/plugin-sitemap'),
-          opts.sitemap,
-        ],
-    ],
-  };
-};
diff --git a/packages/docusaurus-preset-classic/src/index.ts b/packages/docusaurus-preset-classic/src/index.ts
new file mode 100644
index 0000000000..66a3312110
--- /dev/null
+++ b/packages/docusaurus-preset-classic/src/index.ts
@@ -0,0 +1,71 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import type {
+  Preset,
+  LoadContext,
+  PluginConfig,
+  PluginOptions,
+} from '@docusaurus/types';
+import type {Options, ThemeConfig} from '@docusaurus/preset-classic';
+
+function makePluginConfig(
+  source: string,
+  options?: PluginOptions,
+): string | [string, PluginOptions] {
+  if (options) {
+    return [require.resolve(source), options];
+  }
+  return require.resolve(source);
+}
+
+export default function preset(
+  context: LoadContext,
+  opts: Options = {},
+): Preset {
+  const {siteConfig} = context;
+  const {themeConfig} = siteConfig;
+  const {algolia, googleAnalytics, gtag} = themeConfig as ThemeConfig;
+  const isProd = process.env.NODE_ENV === 'production';
+
+  const themes: PluginConfig[] = [];
+  themes.push(makePluginConfig('@docusaurus/theme-classic', opts.theme));
+  if (algolia) {
+    themes.push(require.resolve('@docusaurus/theme-search-algolia'));
+  }
+
+  const plugins: PluginConfig[] = [];
+  if (opts.docs !== false) {
+    plugins.push(
+      makePluginConfig('@docusaurus/plugin-content-docs', opts.docs),
+    );
+  }
+  if (opts.blog !== false) {
+    plugins.push(
+      makePluginConfig('@docusaurus/plugin-content-blog', opts.blog),
+    );
+  }
+  if (opts.pages !== false) {
+    plugins.push(
+      makePluginConfig('@docusaurus/plugin-content-pages', opts.pages),
+    );
+  }
+  if (isProd && googleAnalytics) {
+    plugins.push(require.resolve('@docusaurus/plugin-google-analytics'));
+  }
+  if (opts.debug || (typeof opts.debug === 'undefined' && !isProd)) {
+    plugins.push(require.resolve('@docusaurus/plugin-debug'));
+  }
+  if (isProd && gtag) {
+    plugins.push(require.resolve('@docusaurus/plugin-google-gtag'));
+  }
+  if (isProd && opts.sitemap !== false) {
+    plugins.push(makePluginConfig('@docusaurus/plugin-sitemap', opts.sitemap));
+  }
+
+  return {themes, plugins};
+}
diff --git a/packages/docusaurus-preset-classic/tsconfig.json b/packages/docusaurus-preset-classic/tsconfig.json
new file mode 100644
index 0000000000..f5902ba108
--- /dev/null
+++ b/packages/docusaurus-preset-classic/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "incremental": true,
+    "tsBuildInfoFile": "./lib/.tsbuildinfo",
+    "rootDir": "src",
+    "outDir": "lib"
+  }
+}