fix(linter): remove defineConfig check

apps/oxlint/src-js/js_config.ts

@@ -1,7 +1,6 @@
 import { basename as pathBasename } from "node:path";
 
 import { getErrorMessage } from "./utils/utils.ts";
-import { isDefineConfig } from "./package/config.ts";
 import { DateNow, JSONStringify } from "./utils/globals.ts";
 
 interface JsConfigResult {
@@ -135,12 +134,6 @@ export async function loadJsConfigs(paths: string[]): Promise<string> {
         if (!isObject(config)) {
           throw new Error(`Configuration file must have a default export that is an object.`);
         }
-
-        if (!isDefineConfig(config)) {
-          throw new Error(
-            `Configuration file must wrap its default export with defineConfig() from "oxlint".`,
-          );
-        }
         validateConfigExtends(config as object);
         return { path, config };
       }),

apps/oxlint/src-js/package/config.ts

@@ -36,21 +36,12 @@ export interface OxlintConfig extends Oxlintrc {
 
 export type { OxlintOverride };
 
-const DEFINE_CONFIG_REGISTRY = new WeakSet<object>();
-
 /**
  * Define an Oxlint configuration with type inference.
  *
  * @param config - Oxlint configuration
  * @returns Config unchanged
  */
 export function defineConfig<T extends OxlintConfig>(config: T): T {
-  DEFINE_CONFIG_REGISTRY.add(config as object);
   return config;
 }
-
-export function isDefineConfig(config: unknown): boolean {
-  return (
-    typeof config === "object" && config !== null && DEFINE_CONFIG_REGISTRY.has(config as object)
-  );
-}