Node.js中代码重复与不一致的问题及解决方案

// utils.js
function formatDate(date) {
  return date.toISOString().split('T')[0];
}

module.exports = { formatDate };

const { formatDate } = require('./utils');

console.log(formatDate(new Date()));

// 使用驼峰命名法
const myFunction = () => {
  // ...
};

// 使用蛇形命名法
const my_function = () => {
  // ...
};

npm install eslint --save-dev

{
  "extends": "eslint:recommended",
  "rules": {
    "no-unused-vars": "warn",
    "no-console": "off",
    "camelcase": "error"
  }
}

// utils.test.js
const { formatDate } = require('./utils');

test('formatDate should return correct date format', () => {
  const date = new Date('2024-06-11');
  expect(formatDate(date)).toBe('2024-06-11');
});

// config.js
module.exports = {
  port: 3000,
  dbUrl: 'mongodb://localhost:27017/mydb'
};

const config = require('./config');

console.log(config.port);

// .env
PORT=3000
DB_URL=mongodb://localhost:27017/mydb

// config.js
require('dotenv').config();

module.exports = {
  port: process.env.PORT,
  dbUrl: process.env.DB_URL
};