如何在 Typescript 中将一个类传递给另一个类？ [关闭]

Question

我有以下类 UserRepo：

import User from './UserModel'
export default class UserRepo { 
   async createUser(user: {name: string}): Promise<User>{
       const user = new User(user);
       return await user.save()
  }
}

我想导出这个类并在构造函数中将它绑定到另一个类中，这样我就可以在另一个类中访问这个方法createUser（以及类UserRepo的整个实例）。例如 this.UserRepo.createUser({name: "Bob"});

我对新课程的想法的伪代码：

import User from './UserModel'
import UserRepo from './UserRepo';

interface IUserImplementation {
    insertUser(user: {name: string}): Promise<User>
}

export default class UserImplementation implements IUserImplementation {
    constructor(UserRepo) {
        this.userRepo = new UserRepo();
    }
    
    async insertUser(user: {name: string}){
        const data = await this.userRepo.createUser(user);
    }
}

Answer 1

您可能希望实现dependency injection 模式。

推荐：

export default class UserImplementation implements IUserImplementation {
    constructor(UserRepo: UserRepo) { // have the user create the UserRepo instance
        this.userRepo = UserRepo;
    }
    
    async insertUser(user: {name: string}){
        const data = await this.userRepo.createUser(user);
    }
}

你也可以这样做：

export default class UserImplementation implements IUserImplementation {
    constructor() { // nothing
        this.userRepo = new UserRepo(); // create instance in constructor
    }
    
    async insertUser(user: {name: string}){
        const data = await this.userRepo.createUser(user);
    }
}