chore(eslint): enforce file extension usage for internal modules, ignore external packages (#3116)

* chore(eslint): enforce file extension usage for internal modules, ignore external packages

* chore(*): apply the updated ESLint rules to the relevant files

eslint.config.mjs

@@ -42,7 +42,7 @@ export default tseslint.config(
       'import/namespace': 'off',
       'import/no-named-as-default-member': 'off',
       'import/no-duplicates': 'error',
-      'import/extensions': ['error', 'always'],
+      'import/extensions': ['error', 'always', { ignorePackages: true }],
       'import/order': [
         'error',
         {

src/traditional.ts

@@ -1,5 +1,4 @@
 import React from 'react'
-// eslint-disable-next-line import/extensions
 import useSyncExternalStoreExports from 'use-sync-external-store/shim/with-selector'
 import { createStore } from './vanilla.ts'
 import type {

vitest.config.mts

@@ -1,5 +1,4 @@
 import { resolve } from 'path'
-// eslint-disable-next-line import/extensions
 import { defineConfig } from 'vitest/config'
 
 export default defineConfig({