Update

src/index.ts

@@ -1,18 +1,11 @@
 /// <reference path="./modules.d.ts" />
 import './redirect';
 import { uniq } from 'lodash';
-import type { Merge, SetRequired } from 'type-fest';
 import type { Rule } from 'eslint';
 import type { ESLintUtils } from '@typescript-eslint/utils';
-import type {
-  ESLintConfig,
-  Extends,
-  KnownExtends,
-  Plugin,
-  Rules,
-  Settings,
-} from '@aet/eslint-define-config';
+import type { ESLintConfig, Extends, Plugin, Rules } from '@aet/eslint-define-config';
 
+import type { Middleware, MiddlewareConfig, MiddlewareFunctions } from './middleware';
 import { importTypeScript } from './presets/typescript';
 import { unicorn } from './presets/unicorn';
 import { eslintRules } from './presets/eslint';
@@ -67,8 +60,6 @@ export interface CustomRule {
   options?: RuleLevel;
 }
 
-export type Middleware = (config: MiddlewareConfig, helpers: MiddlewareFunctions) => void;
-
 /**
  * ESLint Configuration.
  * @see [ESLint Configuration](https://eslint.org/docs/latest/user-guide/configuring/)
@@ -94,27 +85,6 @@ export type InputConfig = Omit<ESLintConfig, 'rules'> & {
   auto?: boolean;
 };
 
-type OptionalObjectKey<T> = Exclude<
-  {
-    [Key in keyof T]: undefined | any[] extends T[Key]
-      ? Key
-      : undefined | Record<any, any> extends T[Key]
-        ? Key
-        : never;
-  }[keyof T],
-  undefined
->;
-
-type MiddlewareConfig = Merge<
-  SetRequired<ESLintConfig, OptionalObjectKey<ESLintConfig>>,
-  { extends: KnownExtends[] }
->;
-
-interface MiddlewareFunctions {
-  addRules(rules: Partial<RuleOptions>): void;
-  addSettings(settings: Partial<Settings>): void;
-}
-
 /**
  * Returns a ESLint config object.
  *