【前端】手把手教你用TypeScript写一个简单的eslint插件并发布到npm

以下是一个简化的例子，展示如何用TypeScript编写一个ESLint插件，并发布到npm：

1. 初始化npm项目并安装依赖：

mkdir my-eslint-plugin
cd my-eslint-plugin
npm init -y
npm install eslint @types/estree --save-dev
npm install typescript ts-node eslint-plugin-test --save-dev

2. 创建tsconfig.json：

{
  "compilerOptions": {
    "module": "commonjs",
    "target": "es2017",
    "noImplicitReturns": true,
    "strictNullChecks": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "types": ["estree"],
    "outDir": "dist"
  },
  "include": ["src/**/*.ts"]
}

3. 创建src/index.ts并编写ESLint插件：

import { AST, ASTNode, ASTPlugin, ASTPluginFactory } from "eslint-plugin-test";
 
class MyPlugin implements ASTPlugin {
  setup(info: any): void {
    // 插件设置逻辑
  }
 
  apply(node: ASTNode, info: any): void {
    // 检查node并报告问题逻辑
  }
}
 
const factory: ASTPluginFactory = (context: any) => {
  return {
    name: "my-plugin",
    enter(node: ASTNode) {
      const plugin = new MyPlugin();
      plugin.setup(context);
      plugin.apply(node, context);
    }
  };
};
 
export = factory;

4. 创建src/rules/no-unused-variables.ts并编写规则：

import { AST, ASTNode, ASTPlugin, ASTPluginFactory } from "eslint-plugin-test";
 
class NoUnusedVariables implements ASTPlugin {
  setup(info: any): void {
    // 设置逻辑
  }
 
  apply(node: ASTNode, info: any): void {
    // 检查并报告未使用的变量
  }
}
 
const factory: ASTPluginFactory = (context: any) => {
  return {
    name: "no-unused-variables",
    enter(node: ASTNode) {
      const plugin = new NoUnusedVariables();
      plugin.setup(context);
      plugin.apply(node, context);
    }
  };
};
 
export = factory;

5. 编写package.json中的main字段指向入口文件：

{
  "name": "my-eslint-plugin",
  "version": "1.0.0",
  "main": "dist/index.js",
  "scripts": {
    "build": "tsc",
    "lint": "tslint --project ."
  },
  "devDependencies": {
    "eslint-plugin-test": "^1.0.0",
    "tslint": "^5.10.0",
    "typescript": "^2.9.2"
  },
  "peerDependencies": {
    "eslint": "^4.0.0",
    "@types/estree": "^0.0.46"
  },
  "keywords": ["eslint-plugin"],
  "author": "Your Name",
  "license": "MIT"
}

6. 编译并测试插件：

npm run build

7. 发布到npm：

   确保你已在npm官网注册账号，并且在本地设置了npm的配置。

npm login
npm publish

以上步骤创建了一个简单的ESLint插件，并展示了如何将其编译并发布到npm。这个例子提供了一个框架，开发者可以在此基础上添加自