docs(QA): add how to external module in DTS (#706)

Co-authored-by: Timeless0911 <[email protected]>

Author: fi3ework

website/docs/en/guide/faq/features.mdx

@@ -92,3 +92,24 @@ export default {
   },
 };
 ```
+
+## d.ts generation
+
+### How to additionally exclude specified dependencies when `dts.bundle` is `true`?
+
+Rslib uses [rsbuild-plugin-dts](https://github.com/web-infra-dev/rslib/blob/main/packages/plugin-dts/README.md) to generate d.ts files, which supports configuration via [output.externals](/config/rsbuild/output#outputtarget) for excluding certain dependencies from bundled d.ts files.
+
+For example, a typical React component library often does not declare @types/react in peerDependencies but only in devDependencies. Following the [autoExternal](/config/lib/auto-external) logic for dependency handling, Rslib will attempt to bundle @types/react into the d.ts artifact during the build. However, in practice, a component library should not bundle @types/react.
+
+In this scenario, you can configure [output.externals](/config/rsbuild/output#outputtarget) to exclude @types/react.
+
+```ts title="rslib.config.ts"
+export default {
+  lib: [
+    // ...
+  ],
+  output: {
+    externals: ['@types/react'],
+  },
+};
+```

website/docs/zh/guide/faq/features.mdx

@@ -92,3 +92,24 @@ export default {
   },
 };
 ```
+
+## d.ts 生成
+
+### 如何在 `dts.bundle` 为 `true` 时额外排除指定的依赖？
+
+Rslib 通过 [rsbuild-plugin-dts](https://github.com/web-infra-dev/rslib/blob/main/packages/plugin-dts/README.md) 完成对 d.ts 文件的生成，该插件支持通过 [output.externals](/config/rsbuild/output#outputtarget) 进行配置，用于从打包后的 d.ts 文件中排除指定的依赖。
+
+举个例子：常见的 React 组件库通常不会将 @types/react 声明在 peerDependencies 中，而是仅声明在 devDependencies，按照 [autoExternal](/config/lib/auto-external) 处理依赖的逻辑，在打包时 Rslib 会尝试将 @types/react 一同打包进 d.ts 产物中，但在实践中组件库并不应该打包 @types/react。
+
+此时可以通过配置 [output.externals](/config/rsbuild/output#outputtarget) 来排除 @types/react。
+
+```ts title="rslib.config.ts"
+export default {
+  lib: [
+    // ...
+  ],
+  output: {
+    externals: ['@types/react'],
+  },
+};
+```