fix(*): make TypeScript realize that each plugin package has a default export (#7294)

packages/docusaurus-preset-classic/package.json

@@ -3,7 +3,7 @@
   "version": "2.0.0-beta.18",
   "description": "Classic preset for Docusaurus.",
   "main": "lib/index.js",
-  "types": "src/preset-classic.d.ts",
+  "types": "lib/index.d.ts",
   "scripts": {
     "build": "tsc",
     "watch": "tsc --watch"

packages/docusaurus-preset-classic/src/index.ts

@@ -11,7 +11,7 @@ import type {
   PluginConfig,
   PluginOptions,
 } from '@docusaurus/types';
-import type {Options, ThemeConfig} from '@docusaurus/preset-classic';
+import type {Options, ThemeConfig} from './options';
 
 function makePluginConfig(
   source: string,
@@ -93,3 +93,5 @@ export default function preset(
 
   return {themes, plugins};
 }
+
+export type {Options, ThemeConfig};