koa TS ESLint搭建服务器重构版过程详解

yarn init -y

yarn add koa koa-router cross-env module-alias dotenv

{
 "compilerOptions": {
    "target": "esnext", // 目标语言版本
    "module": "commonjs", // 指定生成代码的模板标准
    "sourceMap": true,
    "outDir": "./dist", // 指定输出目录, 默认是dist文件夹
    "rootDir": "./src",  
    "strict": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true
 },
 // 需要编译的的文件和目录
 "include": ["src"],
 "exclude": ["node_modules", "dist", "public"]
}

"scripts": {
"dev": "cross-env NODE_ENV=development tsnd --respawn src/main.ts", // 开发环境执行的脚本命令，设置环境变量并监听入口文件的变化
"build": "run-s clearBuild compile copyPublic", // 将TypeScript项目打包成JavaScript项目
"clearBuild": "rimraf dist/*", // 在构建的时候清空dist目录
"compile": "tsc", // 根据tsconfig.json的配置编译TypeScript
"copyPublic": "copyfiles -u 1 src/public/* dist", // 有一些资源是需要我们在dist和src之间来回拷贝的，可以借助该命令实现拷贝
// 其余部分可以按照自己项目最终的部署方式自定义
"serve": "cross-env NODE_ENV=production node dist/main.js",
"start": "pm2 start ecosystem.config.js",
"stop": "pm2 stop ecosystem.config.js",
"restart": "pm2 restart ecosystem.config.js",
"delete": "pm2 delete ecosystem.config.js"
},

const pathResolve = (str: string)
:
string => path.resolve(process.cwd(), str);
const processENV = process.env.NODE_ENV
const isDev = processENV === "development"
try {
    const filename = isDev ? "./.env" : "./.env"
    dotenv.config({path: pathResolve(filename)});
} catch (err) {
    console.log(`${pathResolve(filename)} 不存在`);
}
try {
    const filename = isDev ? "./.env.development" : "./.env.production"
    dotenv.config({path: pathResolve(filename)});
} catch (err) {
    console.log(`${pathResolve(filename)} 不存在`);
}
try {
    const filename = isDev ? "./.env.local" : "./.env.local"
    dotenv.config({path: pathResolve(filename)});
} catch (err) {
    console.log(`${pathResolve(filename)} 不存在`);
}
try {
    const filename = isDev ? "./.env.development.local" : "./.env.production.local"
    dotenv.config({path: pathResolve(filename)});
} catch (err) {
    console.log(`${pathResolve(filename)} 不存在`);
}

"_moduleAliases": {
"@": "./src",
"@app": "./src/app"
}

import "module-alias/register";

yarn add eslint -D
# 初始化Eslint的配置文件，会在项目根目录下生成Eslint的配置文件
npx eslint --init

"script": {
//......
"lint:fix": "eslint --fix --ext .js,.ts,.tsx ."
}

dist
node_modules
.idea
.DS_Store