Update

src/middleware.ts

@@ -0,0 +1,30 @@
+import type { Merge, SetRequired } from 'type-fest';
+import type { ESLintConfig, KnownExtends, Settings } from '@aet/eslint-define-config';
+import type { RuleOptions } from './index';
+
+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
+>;
+
+export type MiddlewareConfig = Merge<
+  SetRequired<ESLintConfig, OptionalObjectKey<ESLintConfig>>,
+  { extends: KnownExtends[] }
+>;
+
+export interface MiddlewareFunctions {
+  addRules(rules: Partial<RuleOptions>): void;
+  addSettings(settings: Partial<Settings>): void;
+}
+
+export type Middleware = (config: MiddlewareConfig, helpers: MiddlewareFunctions) => void;
+
+export function defineMiddleware(middleware: Middleware): Middleware {
+  return middleware;
+}