diff --git a/__tests__/__fixtures__/configureWebpack/index.ts b/__tests__/__fixtures__/configureWebpack/index.ts
new file mode 100644
index 000000000000..9b9b2f95c74c
--- /dev/null
+++ b/__tests__/__fixtures__/configureWebpack/index.ts
@@ -0,0 +1,35 @@
+/**
+ * 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 {Plugin} from '../../../packages/docusaurus-types/src/index';
+
+export const plugin: Plugin = {
+  name: 'example-plugin',
+  configureWebpack(config) {
+    return {
+      devServer: {
+        ...config.devServer,
+        open: '/docs',
+        client: {overlay: false},
+      },
+      optimization: {minimize: false},
+      mergeStrategy: {'module.rules': 'prepend'},
+    };
+  },
+};
+
+type WebpackResult = Exclude<
+  ReturnType<NonNullable<Plugin['configureWebpack']>>,
+  void
+>;
+
+export const invalidConfig: WebpackResult = {
+  devServer: {
+    // @ts-expect-error The dev server open option does not accept numbers.
+    open: 42,
+  },
+};
diff --git a/__tests__/plugin-types.test.ts b/__tests__/plugin-types.test.ts
new file mode 100644
index 000000000000..6a6b1fbe1b33
--- /dev/null
+++ b/__tests__/plugin-types.test.ts
@@ -0,0 +1,36 @@
+/**
+ * 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 {describe, expect, it} from 'vitest';
+import {fileURLToPath} from 'node:url';
+import ts from 'typescript';
+
+describe('plugin types', () => {
+  it('supports devServer without a consumer importing webpack-dev-server', () => {
+    const fixture = fileURLToPath(
+      new URL('./__fixtures__/configureWebpack/index.ts', import.meta.url),
+    );
+    // Compile separately: other tests import webpack-dev-server, which augments
+    // webpack Configuration and would hide missing imports in our public types.
+    const program = ts.createProgram([fixture], {
+      strict: true,
+      noEmit: true,
+      skipLibCheck: true,
+      types: [],
+      target: ts.ScriptTarget.ESNext,
+      module: ts.ModuleKind.ESNext,
+      moduleResolution: ts.ModuleResolutionKind.Bundler,
+      esModuleInterop: true,
+    });
+    const diagnostics = ts
+      .getPreEmitDiagnostics(program)
+      .map((diagnostic) =>
+        ts.flattenDiagnosticMessageText(diagnostic.messageText, '\n'),
+      );
+    expect(diagnostics).toEqual([]);
+  });
+});
diff --git a/packages/docusaurus-types/package.json b/packages/docusaurus-types/package.json
index 30d9a61a4b37..eb329558ba61 100644
--- a/packages/docusaurus-types/package.json
+++ b/packages/docusaurus-types/package.json
@@ -22,6 +22,7 @@
     "mdast-util-directive": "catalog:",
     "utility-types": "catalog:",
     "webpack": "catalog:",
+    "webpack-dev-server": "catalog:",
     "webpack-merge": "catalog:"
   },
   "peerDependencies": {
diff --git a/packages/docusaurus-types/src/plugin.d.ts b/packages/docusaurus-types/src/plugin.d.ts
index ba777a47d4e3..9a0a1111abc7 100644
--- a/packages/docusaurus-types/src/plugin.d.ts
+++ b/packages/docusaurus-types/src/plugin.d.ts
@@ -7,6 +7,8 @@
 
 import type {CodeTranslations, TranslationFile} from './i18n';
 import type {RuleSetRule, Configuration as WebpackConfiguration} from 'webpack';
+// Load the devServer augmentation of webpack.Configuration.
+import type {} from 'webpack-dev-server';
 import type {CustomizeRuleString} from 'webpack-merge/dist/types';
 import type {Command} from 'commander';
 import type Joi from 'joi';
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 6ccc188d29c9..6cd6517a15da 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -2647,6 +2647,9 @@ importers:
       webpack:
         specifier: 'catalog:'
         version: 5.111.0(@swc/core@1.16.2)(@swc/html@1.16.2)(clean-css@5.3.3)(cssnano@7.1.9(postcss@8.5.28))(csso@5.0.5)(html-minifier-terser@7.2.0)(lightningcss@1.33.0)(postcss@8.5.28)(sharp@0.35.5(@types/node@26.6.1))(svgo@4.1.0)(uglify-js@3.19.3)
+      webpack-dev-server:
+        specifier: 'catalog:'
+        version: 6.0.0(supports-color@10.2.2)(webpack@5.111.0(@swc/core@1.16.2)(@swc/html@1.16.2)(clean-css@5.3.3)(cssnano@7.1.9(postcss@8.5.28))(csso@5.0.5)(html-minifier-terser@7.2.0)(lightningcss@1.33.0)(postcss@8.5.28)(sharp@0.35.5(@types/node@26.6.1))(svgo@4.1.0)(uglify-js@3.19.3))
       webpack-merge:
         specifier: 'catalog:'
         version: 6.0.1