fix: use type-only export

Author: jahands

.changeset/petite-berries-hammer.md

@@ -0,0 +1,5 @@
+---
+'@repo/eslint-config': patch
+---
+
+fix: use type-only export

packages/eslint-config/src/default.config.ts

@@ -10,10 +10,11 @@ import * as tseslint from 'typescript-eslint'
 
 import { getDirname, getGitIgnoreFiles, getTsconfigRootDir } from './helpers'
 
-import type { ConfigObject } from '@eslint/core'
 import type { Linter } from 'eslint'
 
-export { defineConfig, ConfigObject as Config }
+export type { ConfigObject as Config } from '@eslint/core'
+
+export { defineConfig }
 
 const compat = new FlatCompat({
 	// This helps FlatCompat resolve plugins relative to this config file