diff --git a/packages/rstack/src/config.ts b/packages/rstack/src/config.ts
index 59b8f92c..f806237f 100644
--- a/packages/rstack/src/config.ts
+++ b/packages/rstack/src/config.ts
@@ -23,7 +23,7 @@ type RslintConfigFactory = (
 
 export type RslintConfigDefinition = RslintConfig | RslintConfigFactory;
 
-export type Configs = {
+export type RstackConfigDefinitions = {
   app?: RsbuildConfigDefinition;
   lib?: RslibConfigDefinition;
   doc?: RspressConfigDefinition;
@@ -34,14 +34,14 @@ export type Configs = {
 };
 
 /** Shared configuration input; lint factories receive the tool exports. */
-export type RstackConfig = Omit<Configs, 'lint'> & {
+export type RstackConfig = Omit<RstackConfigDefinitions, 'lint'> & {
   extends?: readonly RstackConfig[];
   lint?: RslintConfigDefinition;
 };
 
 const normalizeLintConfig = (
   config: RslintConfigDefinition,
-): NonNullable<Configs['lint']> =>
+): NonNullable<RstackConfigDefinitions['lint']> =>
   typeof config === 'function'
     ? async () => config(await import('@rslint/core'))
     : config;
@@ -51,14 +51,14 @@ export const normalizeRstackConfig = ({
   extends: _extends,
   lint,
   ...configs
-}: RstackConfig): Configs =>
+}: RstackConfig): RstackConfigDefinitions =>
   lint === undefined
     ? configs
     : { ...configs, lint: normalizeLintConfig(lint) };
 
 export type LoadedRstackConfig = {
   /** Effective tool definitions. Configuration factories remain unevaluated. */
-  configs: Configs;
+  configs: RstackConfigDefinitions;
   filePath: string | null;
   dependencies: string[];
 };
@@ -79,7 +79,7 @@ export type LoadRstackConfigOptions = {
 };
 
 type ConfigSession = {
-  configs: Configs;
+  configs: RstackConfigDefinitions;
   extends?: readonly RstackConfig[];
   active: boolean;
 };
@@ -194,9 +194,9 @@ type Define = {
   staged: (config: StagedConfig) => void;
 };
 
-const setConfig = <T extends keyof Configs>(
+const setConfig = <T extends keyof RstackConfigDefinitions>(
   type: T,
-  config: Configs[T],
+  config: RstackConfigDefinitions[T],
 ): void => {
   const session = getConfigSessionStorage().getStore();
 
diff --git a/packages/rstack/src/configExports.ts b/packages/rstack/src/configExports.ts
index 7da0a774..8f79ec1b 100644
--- a/packages/rstack/src/configExports.ts
+++ b/packages/rstack/src/configExports.ts
@@ -1,7 +1,7 @@
 /** Public configuration APIs exposed through `rstack/config`. */
 export {
   loadRstackConfig,
-  type Configs,
+  type RstackConfigDefinitions,
   type LoadedRstackConfig,
   type LoadRstackConfigOptions,
 } from './config.ts';
diff --git a/packages/rstack/src/configLayers.ts b/packages/rstack/src/configLayers.ts
index bc46628e..615db230 100644
--- a/packages/rstack/src/configLayers.ts
+++ b/packages/rstack/src/configLayers.ts
@@ -7,7 +7,7 @@ import type { RslintConfig } from '@rslint/core';
 import type { UserConfig as RspressConfig } from '@rspress/core';
 import type { RstestConfig } from '@rstest/core';
 import {
-  type Configs,
+  type RstackConfigDefinitions,
   type RstackConfig,
   normalizeRstackConfig,
 } from './config.ts';
@@ -24,7 +24,7 @@ type ConfigValues = {
   staged: StagedConfig;
 };
 
-type ConfigArgs<K extends keyof Configs> = K extends 'app'
+type ConfigArgs<K extends keyof RstackConfigDefinitions> = K extends 'app'
   ? [params: AppConfigParams]
   : K extends 'lib'
     ? [params: LibConfigParams]
@@ -33,8 +33,8 @@ type ConfigArgs<K extends keyof Configs> = K extends 'app'
 /** Expand inherited configs before their children, preserving every occurrence. */
 export const flattenConfigLayers = (
   configs: readonly RstackConfig[],
-): Configs[] => {
-  const layers: Configs[] = [];
+): RstackConfigDefinitions[] => {
+  const layers: RstackConfigDefinitions[] = [];
   const ancestors = new Map<RstackConfig, string>();
 
   const visit = (config: RstackConfig, path: string): void => {
@@ -63,8 +63,10 @@ export const flattenConfigLayers = (
  * Resolve one tool from ordered, normalized config layers. Lint factories are
  * already wrapped by define.lint. This function does not merge the results.
  */
-export const resolveConfigLayers = async <K extends keyof Configs>(
-  layers: readonly Configs[],
+export const resolveConfigLayers = async <
+  K extends keyof RstackConfigDefinitions,
+>(
+  layers: readonly RstackConfigDefinitions[],
   kind: K,
   ...args: ConfigArgs<K>
 ): Promise<ConfigValues[K][]> => {
@@ -91,14 +93,14 @@ export const resolveConfigLayers = async <K extends keyof Configs>(
 };
 
 export const resolveRslintConfig = async (
-  layers: readonly Configs[],
+  layers: readonly RstackConfigDefinitions[],
 ): Promise<RslintConfig | undefined> => {
   const configs = await resolveConfigLayers(layers, 'lint');
   return configs.length > 1 ? configs.flat() : configs[0];
 };
 
 export const resolveStagedConfig = async (
-  layers: readonly Configs[],
+  layers: readonly RstackConfigDefinitions[],
 ): Promise<StagedConfig | undefined> => {
   const configs = await resolveConfigLayers(layers, 'staged');
   if (configs.length <= 1) {
@@ -114,7 +116,7 @@ export const resolveStagedConfig = async (
 };
 
 export const resolveFmtConfigLayers = async (
-  layers: readonly Configs[],
+  layers: readonly RstackConfigDefinitions[],
 ): Promise<FmtConfig | undefined> => {
   const configs = await resolveConfigLayers(layers, 'fmt');
   return configs.length > 1
@@ -124,13 +126,13 @@ export const resolveFmtConfigLayers = async (
 
 /** Compose effective definitions without executing any tool or task factories. */
 export const composeConfigLayers = async (
-  layers: readonly Configs[],
-): Promise<Configs> => {
+  layers: readonly RstackConfigDefinitions[],
+): Promise<RstackConfigDefinitions> => {
   if (layers.length <= 1) {
     return layers[0] ?? {};
   }
 
-  const configs: Configs = {};
+  const configs: RstackConfigDefinitions = {};
   for (const kind of [
     'app',
     'lib',
diff --git a/packages/rstack/src/fmt/config.ts b/packages/rstack/src/fmt/config.ts
index 1d9ba7b0..68f00747 100644
--- a/packages/rstack/src/fmt/config.ts
+++ b/packages/rstack/src/fmt/config.ts
@@ -1,6 +1,6 @@
 import { dirname } from 'node:path';
 import micromatch from 'micromatch';
-import type { Configs } from '../config.ts';
+import type { RstackConfigDefinitions } from '../config.ts';
 import { resolveFmtConfigLayers } from '../configLayers.ts';
 import { createRelativePathResolver } from './pathHelpers.ts';
 import type {
@@ -10,7 +10,7 @@ import type {
 } from './types.ts';
 
 type ResolveFmtConfigOptions = {
-  layers: readonly Configs[];
+  layers: readonly RstackConfigDefinitions[];
   configFilePath: string | null;
   cwd: string;
 };
diff --git a/packages/rstack/src/rsbuildConfig.ts b/packages/rstack/src/rsbuildConfig.ts
index a6ef3cc1..84207472 100644
--- a/packages/rstack/src/rsbuildConfig.ts
+++ b/packages/rstack/src/rsbuildConfig.ts
@@ -5,11 +5,11 @@ import {
   mergeRsbuildConfig,
 } from '@rsbuild/core';
 import { withConfigMeta } from '@rstackjs/load-config';
-import { loadRstackConfig, type Configs } from './config.ts';
+import { loadRstackConfig, type RstackConfigDefinitions } from './config.ts';
 import { resolveConfigLayers } from './configLayers.ts';
 
 export const resolveRsbuildConfig = async (
-  layers: readonly Configs[],
+  layers: readonly RstackConfigDefinitions[],
   params: ConfigParams,
 ): Promise<RsbuildConfig> => {
   const configs = await resolveConfigLayers(layers, 'app', params);
diff --git a/packages/rstack/src/rslibConfig.ts b/packages/rstack/src/rslibConfig.ts
index 3faaf14e..749d30b3 100644
--- a/packages/rstack/src/rslibConfig.ts
+++ b/packages/rstack/src/rslibConfig.ts
@@ -5,11 +5,11 @@ import {
   mergeRslibConfig,
 } from '@rslib/core';
 import { withConfigMeta } from '@rstackjs/load-config';
-import { loadRstackConfig, type Configs } from './config.ts';
+import { loadRstackConfig, type RstackConfigDefinitions } from './config.ts';
 import { resolveConfigLayers } from './configLayers.ts';
 
 export const resolveRslibConfig = async (
-  layers: readonly Configs[],
+  layers: readonly RstackConfigDefinitions[],
   params: ConfigParams,
 ): Promise<RslibConfig> => {
   const configs = await resolveConfigLayers(layers, 'lib', params);
diff --git a/packages/rstack/src/rspressConfig.ts b/packages/rstack/src/rspressConfig.ts
index 401cd401..afa5f0cd 100644
--- a/packages/rstack/src/rspressConfig.ts
+++ b/packages/rstack/src/rspressConfig.ts
@@ -1,10 +1,10 @@
 import type { WatchFiles } from '@rsbuild/core';
 import type { UserConfig } from '@rspress/core';
-import { loadRstackConfig, type Configs } from './config.ts';
+import { loadRstackConfig, type RstackConfigDefinitions } from './config.ts';
 import { resolveConfigLayers } from './configLayers.ts';
 
 export const resolveRspressConfig = async (
-  layers: readonly Configs[],
+  layers: readonly RstackConfigDefinitions[],
 ): Promise<UserConfig> => {
   const configs = await resolveConfigLayers(layers, 'doc');
   if (configs.length <= 1) {
diff --git a/packages/rstack/src/rstestConfig.ts b/packages/rstack/src/rstestConfig.ts
index d02868ba..34700532 100644
--- a/packages/rstack/src/rstestConfig.ts
+++ b/packages/rstack/src/rstestConfig.ts
@@ -4,11 +4,11 @@ import {
   type RstestConfigExport,
   mergeRstestConfig,
 } from '@rstest/core';
-import { loadRstackConfig, type Configs } from './config.ts';
+import { loadRstackConfig, type RstackConfigDefinitions } from './config.ts';
 import { resolveConfigLayers } from './configLayers.ts';
 
 const resolveAutomaticExtends = async (
-  layers: readonly Configs[],
+  layers: readonly RstackConfigDefinitions[],
   params: ConfigParams,
 ): Promise<RstestConfig['extends'] | undefined> => {
   // Prefer the app when both app and lib are defined. Merging both adapters can
@@ -55,7 +55,7 @@ const injectExtends = <T extends RstestConfig>(
 };
 
 const extendsConfig = async (
-  layers: readonly Configs[],
+  layers: readonly RstackConfigDefinitions[],
   testConfig: RstestConfig,
   params: ConfigParams,
 ) => {
@@ -88,7 +88,7 @@ const extendsConfig = async (
 };
 
 export const mergeRstestConfigLayers = async (
-  layers: readonly Configs[],
+  layers: readonly RstackConfigDefinitions[],
 ): Promise<RstestConfig> => {
   const configs = await resolveConfigLayers(layers, 'test');
   return configs.length > 1
@@ -97,7 +97,7 @@ export const mergeRstestConfigLayers = async (
 };
 
 export const resolveRstestConfig = async (
-  layers: readonly Configs[],
+  layers: readonly RstackConfigDefinitions[],
   params: ConfigParams,
 ): Promise<RstestConfig> => {
   const testConfig = await mergeRstestConfigLayers(layers);
diff --git a/packages/rstack/tests/types/resolution-bundler/index.ts b/packages/rstack/tests/types/resolution-bundler/index.ts
index 0065184e..b40f9b34 100644
--- a/packages/rstack/tests/types/resolution-bundler/index.ts
+++ b/packages/rstack/tests/types/resolution-bundler/index.ts
@@ -6,7 +6,7 @@ import { define, type RstackConfig } from 'rstack';
 import { createRsbuild, defineConfig as defineAppConfig } from 'rstack/app';
 import {
   loadRstackConfig,
-  type Configs,
+  type RstackConfigDefinitions,
   type LoadedRstackConfig,
   type LoadRstackConfigOptions,
 } from 'rstack/config';
@@ -21,7 +21,7 @@ const loadOptions: LoadRstackConfigOptions = {
   configFilePath: 'rstack.config.ts',
 };
 const loadedConfig: Promise<LoadedRstackConfig> = loadRstackConfig(loadOptions);
-const configs: Configs = {};
+const configs: RstackConfigDefinitions = {};
 const sharedConfig: RstackConfig = {
   app: appConfig,
   lint: lintConfig,
diff --git a/packages/rstack/tests/types/resolution-nodenext/index.ts b/packages/rstack/tests/types/resolution-nodenext/index.ts
index 0065184e..b40f9b34 100644
--- a/packages/rstack/tests/types/resolution-nodenext/index.ts
+++ b/packages/rstack/tests/types/resolution-nodenext/index.ts
@@ -6,7 +6,7 @@ import { define, type RstackConfig } from 'rstack';
 import { createRsbuild, defineConfig as defineAppConfig } from 'rstack/app';
 import {
   loadRstackConfig,
-  type Configs,
+  type RstackConfigDefinitions,
   type LoadedRstackConfig,
   type LoadRstackConfigOptions,
 } from 'rstack/config';
@@ -21,7 +21,7 @@ const loadOptions: LoadRstackConfigOptions = {
   configFilePath: 'rstack.config.ts',
 };
 const loadedConfig: Promise<LoadedRstackConfig> = loadRstackConfig(loadOptions);
-const configs: Configs = {};
+const configs: RstackConfigDefinitions = {};
 const sharedConfig: RstackConfig = {
   app: appConfig,
   lint: lintConfig,
diff --git a/website/docs/en/guide/api-reference.mdx b/website/docs/en/guide/api-reference.mdx
index 18b60a5a..4e63f2bd 100644
--- a/website/docs/en/guide/api-reference.mdx
+++ b/website/docs/en/guide/api-reference.mdx
@@ -130,7 +130,7 @@ The returned object has these fields:
 
 `loadRstackConfig()` only loads configurations; it does not run tool configuration functions. Before running a tool, the caller must resolve its configuration and initialize it.
 
-`rstack/config` also exports the related types: `LoadRstackConfigOptions` for the parameters, `LoadedRstackConfig` for the return value, and `Configs` for the tool configurations.
+`rstack/config` also exports the related types: `LoadRstackConfigOptions` for the parameters, `LoadedRstackConfig` for the return value, and `RstackConfigDefinitions` for the tool configurations.
 
 ## TypeScript types
 
diff --git a/website/docs/zh/guide/api-reference.mdx b/website/docs/zh/guide/api-reference.mdx
index 14f52c75..4d2c3fd8 100644
--- a/website/docs/zh/guide/api-reference.mdx
+++ b/website/docs/zh/guide/api-reference.mdx
@@ -130,7 +130,7 @@ const { configs, filePath, dependencies } = await loadRstackConfig({
 
 `loadRstackConfig()` 仅负责加载配置，不会执行工具配置函数。调用方仍需完成相应工具的配置解析和初始化，才能运行工具。
 
-`rstack/config` 还导出相关类型：`LoadRstackConfigOptions`（参数）、`LoadedRstackConfig`（返回值）和 `Configs`（工具配置）。
+`rstack/config` 还导出相关类型：`LoadRstackConfigOptions`（参数）、`LoadedRstackConfig`（返回值）和 `RstackConfigDefinitions`（工具配置）。
 
 ## TypeScript 类型 \{#typescript-types}