Bạn là Agent Beta (Qwen). Trong quá trình chạy thử ứng dụng CLI Todo App, chúng tôi gặp lỗi sau:

file:///Users/trungkientn/Dev/NodeJS/main-awf/tmp/subagent_project/index.js:1
const fs = require('fs');
           ^

ReferenceError: require is not defined in ES module scope, you can use import instead
This file is being treated as an ES module because it has a '.js' file extension and '/Users/trungkientn/Dev/NodeJS/main-awf/tmp/subagent_project/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension.
    at file:///Users/trungkientn/Dev/NodeJS/main-awf/tmp/subagent_project/index.js:1:12
    at ModuleJob.run (node:internal/modules/esm/module_job:343:25)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:665:26)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:117:5)

Node.js v22.22.0


Hiện tại các file có code như sau:

--- db.js ---
const fs = require('fs');
const path = require('path');

const FILE_PATH = path.join(__dirname, 'tasks.json');

function getTasks() {
    if (!fs.existsSync(FILE_PATH)) {
        return [];
    }
    try {
        const data = fs.readFileSync(FILE_PATH, 'utf8');
        return JSON.parse(data) || [];
    } catch (e) {
        return [];
    }
}

function saveTasks(tasks) {
    fs.writeFileSync(FILE_PATH, JSON.stringify(tasks, null, 2), 'utf8');
}

function addTask(title) {
    const tasks = getTasks();
    const newTask = {
        id: tasks.length > 0 ? Math.max(...tasks.map(t => t.id)) + 1 : 1,
        title,
        completed: false
    };
    tasks.push(newTask);
    saveTasks(tasks);
    return newTask;
}

function completeTask(id) {
    const tasks = getTasks();
    const task = tasks.find(t => t.id === parseInt(id, 10));
    if (task) {
        task.completed = true;
        saveTasks(tasks);
        return true;
    }
    return false;
}

module.exports = {
    getTasks,
    saveTasks,
    addTask,
    completeTask
};

--- index.js ---
const fs = require('fs');
const path = require('path');

const FILE_PATH = path.join(__dirname, 'tasks.json');

function getTasks() {
    if (!fs.existsSync(FILE_PATH)) {
        return [];
    }
    try {
        const data = fs.readFileSync(FILE_PATH, 'utf8');
        return JSON.parse(data) || [];
    } catch (e) {
        return [];
    }
}

function saveTasks(tasks) {
    fs.writeFileSync(FILE_PATH, JSON.stringify(tasks, null, 2), 'utf8');
}

function addTask(title) {
    const tasks = getTasks();
    const newTask = {
        id: tasks.length > 0 ? Math.max(...tasks.map(t => t.id)) + 1 : 1,
        title,
        completed: false
    };
    tasks.push(newTask);
    saveTasks(tasks);
    return newTask;
}

function completeTask(id) {
    const tasks = getTasks();
    const task = tasks.find(t => t.id === parseInt(id, 10));
    if (task) {
        task.completed = true;
        saveTasks(tasks);
        return true;
    }
    return false;
}

module.exports = {
    getTasks,
    saveTasks,
    addTask,
    completeTask
};

--- cli-ui.js ---
'use strict';

const ANSI = {
  reset: '\x1b[0m',
  bold: '\x1b[1m',
  dim: '\x1b[2m',
  green: '\x1b[32m',
  yellow: '\x1b[33m',
  red: '\x1b[31m',
  cyan: '\x1b[36m',
  gray: '\x1b[90m',
};

function color(text, code) {
  return `${code}${text}${ANSI.reset}`;
}

function stripAnsi(text) {
  return String(text).replace(/\x1b\[[0-9;]*m/g, '');
}

function pad(text, width) {
  const raw = stripAnsi(text);
  return String(text) + ' '.repeat(Math.max(0, width - raw.length));
}

function truncate(text, width) {
  const value = String(text);
  if (stripAnsi(value).length <= width) return value;
  return value.slice(0, Math.max(0, width - 1)) + '…';
}

function normalizeTodo(todo, index) {
  return {
    id: todo.id ?? index + 1,
    title: todo.title ?? todo.text ?? todo.task ?? '',
    done: Boolean(todo.done ?? todo.completed),
    priority: todo.priority ?? 'normal',
  };
}

function formatStatus(done) {
  return done ? color('✓ done', ANSI.green) : color('○ open', ANSI.yellow);
}

function formatPriority(priority) {
  const value = String(priority || 'normal').toLowerCase();

  if (value === 'high') return color('high', ANSI.red);
  if (value === 'low') return color('low', ANSI.gray);
  return color('normal', ANSI.cyan);
}

function formatTodoList(todos = []) {
  if (!Array.isArray(todos) || todos.length === 0) {
    return color('No todos yet. Add one with: todo add "Buy milk"', ANSI.dim);
  }

  const rows = todos.map(normalizeTodo);
  const widths = {
    id: Math.max(2, ...rows.map((todo) => String(todo.id).length)),
    status: 7,
    priority: 8,
    title: Math.max(5, ...rows.map((todo) => String(todo.title).length)),
  };

  const border =
    `+-${'-'.repeat(widths.id)}-+-${'-'.repeat(widths.status)}-+-` +
    `${'-'.repeat(widths.priority)}-+-${'-'.repeat(widths.title)}-+`;

  const header =
    `| ${pad(color('ID', ANSI.bold), widths.id)} ` +
    `| ${pad(color('Status', ANSI.bold), widths.status)} ` +
    `| ${pad(color('Priority', ANSI.bold), widths.priority)} ` +
    `| ${pad(color('Task', ANSI.bold), widths.title)} |`;

  const body = rows.map((todo) => {
    const title = todo.done
      ? color(truncate(todo.title, widths.title), ANSI.gray)
      : truncate(todo.title, widths.title);

    return (
      `| ${pad(String(todo.id), widths.id)} ` +
      `| ${pad(formatStatus(todo.done), widths.status)} ` +
      `| ${pad(formatPriority(todo.priority), widths.priority)} ` +
      `| ${pad(title, widths.title)} |`
    );
  });

  return [border, header, border, ...body, border].join('\n');
}

function printTodoList(todos = []) {
  console.log(formatTodoList(todos));
}

function getHelpMenu() {
  return `
${color('Todo CLI', ANSI.bold)}

${color('Usage:', ANSI.cyan)}
  todo <command> [options]

${color('Commands:', ANSI.cyan)}
  add <task>              Add a new todo
  list                    Show all todos
  done <id>               Mark a todo as done
  remove <id>             Remove a todo
  clear                   Remove all completed todos
  help                    Show this help menu

${color('Options:', ANSI.cyan)}
  -p, --priority <level>  Set priority: low, normal, high
  -a, --all               Include completed todos
  -h, --help              Show help

${color('Examples:', ANSI.cyan)}
  todo add "Buy milk"
  todo add "Ship release" --priority high
  todo list --all
  todo done 2
`.trim();
}

function printHelp() {
  console.log(getHelpMenu());
}

function parseArgs(argv = process.argv.slice(2)) {
  const result = {
    command: null,
    args: [],
    options: {},
  };

  const tokens = [...argv];
  result.command = tokens.shift() || 'help';

  while (tokens.length > 0) {
    const token = tokens.shift();

    if (token === '-h' || token === '--help') {
      result.options.help = true;
    } else if (token === '-a' || token === '--all') {
      result.options.all = true;
    } else if (token === '-p' || token === '--priority') {
      result.options.priority = tokens.shift() || 'normal';
    } else if (token.startsWith('--priority=')) {
      result.options.priority = token.split('=').slice(1).join('=') || 'normal';
    } else if (token.startsWith('--')) {
      const key = token.slice(2);
      result.options[key] = true;
    } else {
      result.args.push(token);
    }
  }

  return result;
}

module.exports = {
  ANSI,
  color,
  formatTodoList,
  printTodoList,
  getHelpMenu,
  printHelp,
  parseArgs,
};

Hãy phân tích nguyên nhân lỗi và sửa lại `db.js` và `index.js`. Trả về mã nguồn sửa đổi theo đúng định dạng cũ:
---FILE: db.js---
```js
...
```
---FILE: index.js---
```js
...
```