Cách sử dụng mới CustomerController::class thay vì dùng CustomerController@index như cũ 😂 (ok)

C:\xampp\htdocs\vl\routes\api.php

<?php
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Route;
use App\Http\Controllers\CustomerController;
/*
|--------------------------------------------------------------------------
| API Routes
|--------------------------------------------------------------------------
|
| Here is where you can register API routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| is assigned the "api" middleware group. Enjoy building your API!
|
*/
Route::middleware('auth:sanctum')->get('/user', function (Request $request) {
    return $request->user();
});
Route::resource('customers', CustomerController::class);

C:\xampp\htdocs\vl\app\Http\Controllers\CustomerController.php

<?php
namespace App\Http\Controllers;
use App\Models\Customer;
use Illuminate\Http\Request;
class CustomerController extends Controller {
  /**
   * Display a listing of the resource.
   *
   * @return \Illuminate\Http\Response
   */
  public function index() {
    return Customer::all();
  }
  /**
   * Show the form for creating a new resource.
   *
   * @return \Illuminate\Http\Response
   */
  public function create() {
    //
  }
  /**
   * Store a newly created resource in storage.
   *
   * @param  \Illuminate\Http\Request  $request
   * @return \Illuminate\Http\Response
   */
  public function store(Request $request) {
    //
  }
  /**
   * Display the specified resource.
   *
   * @param  \App\Models\Customer  $customer
   * @return \Illuminate\Http\Response
   */
  public function show(Customer $customer) {
    //
  }
  /**
   * Show the form for editing the specified resource.
   *
   * @param  \App\Models\Customer  $customer
   * @return \Illuminate\Http\Response
   */
  public function edit(Customer $customer) {
    //
  }
  /**
   * Update the specified resource in storage.
   *
   * @param  \Illuminate\Http\Request  $request
   * @param  \App\Models\Customer  $customer
   * @return \Illuminate\Http\Response
   */
  public function update(Request $request, Customer $customer) {
    //
  }
  /**
   * Remove the specified resource from storage.
   *
   * @param  \App\Models\Customer  $customer
   * @return \Illuminate\Http\Response
   */
  public function destroy(Customer $customer) {
    //
  }
}