验证构造函数参数和 lint 错误

Question

我试图在创建 class 的实例时验证构造函数参数。

该参数应该是一个包含完全 class.

中定义的所有属性（适当类型）的对象

如果不是这种情况，我希望 TypeScript 对不匹配进行 lint。

class User {
    username: string;
    // more properties

    constructor(data:object) {
        // Check if data Obejct exactly all the class properties and they are of the right type;
        // Set instance properties
    }
};

// Desired Output
new User(); // "data parameter missing";
new User(45); // "data parameter is not of type object";
new User(); // "username Poperty missing!";
new User({username:"Michael"}); // Valid;
new User({username:43}); // "username is not of type string";
new User({username:"Michael", favoriteFood: "Pizza"}); // "favoriteFood is not a valid property";

tsconfig.json

{
  "compilerOptions": {
    "target": "es2016",
    "module": "es2015",
    "lib": [
      "es2016.array.include"
    ],
    "downlevelIteration": true,
    "strict": true
  }
}

Answer 1

解决方案是声明一个接口：

interface UserProps {
  username: string;
}

class User implements UserProps {
  username: string;
  // more properties

  constructor (data: UserProps) {
    // Check if data Obejct exactly all the class properties and they are of the right type;
    // Set instance properties
  }
}

验证构造函数参数和 lint 错误

Validating constructor parameter and lint error

oop

typescript

tslint