diff --git a/packages/remdx/client.d.ts b/packages/remdx/client.d.ts
index 0422692..7d19a3d 100644
--- a/packages/remdx/client.d.ts
+++ b/packages/remdx/client.d.ts
@@ -3,5 +3,8 @@ declare module '*.re.mdx' {
 
   export let Components: import('./types.jsx').MDXComponents | undefined;
   export let Themes: import('./types.jsx').Themes | undefined;
+  export let Transitions:
+    | Record<string, import('./types.jsx').SlideTransition>
+    | undefined;
   export default slides;
 }
diff --git a/packages/remdx/package.json b/packages/remdx/package.json
index 81b0b75..4a5ec76 100644
--- a/packages/remdx/package.json
+++ b/packages/remdx/package.json
@@ -29,5 +29,8 @@
   },
   "scripts": {
     "build": "rm -f index.js; esbuild --format=esm --outfile=index.js --jsx=automatic --external:react --external:react-dom --bundle ./index.tsx"
+  },
+  "dependencies": {
+    "@types/mdx": "^2.0.11"
   }
 }
diff --git a/packages/remdx/types.tsx b/packages/remdx/types.tsx
index 0fe70f8..ee6221d 100644
--- a/packages/remdx/types.tsx
+++ b/packages/remdx/types.tsx
@@ -1,35 +1,8 @@
+import type { MDXComponents as _MDXComponents } from 'mdx/types.js';
 import { CSSProperties } from 'react';
 
-/**
- * Configuration for `MDXProvider`.
- */
-type MDXProps = {
-  /**
-   * Children (optional).
-   */
-  children?: ReactNode | null | undefined;
-  /**
-   * Additional components to use or a function that creates them (optional).
-   */
-  components?: Readonly<MDXComponents> | MergeComponents | null | undefined;
-  /**
-   * Turn off outer component context (default: `false`).
-   */
-  disableParentContext?: boolean | null | undefined;
-};
-
-/**
- * Provider for MDX context.
- *
- * @param {Readonly<MDXProps>} properties
- *   Properties.
- * @returns {JSX.Element}
- *   Element.
- * @satisfies {Component}
- */
-function MDXProvider(properties: Readonly<MDXProps>): JSX.Element;
+export type MDXComponents = _MDXComponents;
 
-export type MDXComponents = MDXProps['components'];
 export type Themes = Record<string, CSSProperties>;
 
 export type SlideTransition = {
@@ -44,7 +17,7 @@ export type ReMDXSlide = {
 };
 
 export type ReMDXModule = {
-  Components?: MDXComponents;
+  Components?: _MDXComponents;
   Themes?: Themes;
   Transitions?: Record<string, SlideTransition>;
   default: ReadonlyArray<ReMDXSlide>;
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index bad9d25..1d4b7ef 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -104,6 +104,10 @@ importers:
         version: 2.4.2
 
   packages/remdx:
+    dependencies:
+      '@types/mdx':
+        specifier: ^2.0.11
+        version: 2.0.11
     devDependencies:
       '@mdx-js/react':
         specifier: ^3.0.0