如何在 Thenable 对象中正确返回“this”？

Question

I am developing a NodeJS package that contains a Thenable class (see Thenable objects ) that is supposed to return this (the initialized object itself), but instead it is returning a new, uninitialized object and it is stuck in a neverending loop. 下面是代码：

node_modules/<我的包>/index.js

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

class MyAPI {

  #token = "";

  constructor(username, password) {
    this.#token = token;
  }

  then(resolve, reject) {
    const options = {
      url: "/api/authenticate",
      baseURL: "https://myapi.com/",
      method: 'post',
      maxRedirects: 0,
      data: {
        token: this.#token
      },
      transformRequest: this.#transformRequest('urlencoded'),
      transformResponse: this.#transformResponse
    };
    axios.request(options).then((res) => {
      if (res.data.authenticated === true) {
        console.log("Authenticated!");
        resolve(this); // <-- should return the initialized object, but instead returns a new uninitialized object
      } else {
        reject(new Error('Invalid credentials'));
      }
    });
  }

  #transformRequest(type) {
    if (type === 'urlencoded') {
      return function(data) {
        return (new URLSearchParams(data)).toString();
      }
    } else if (type === 'json') {
      return function(data) {
        return JSON.stringify(data);
      }
    }
  }

  #transformResponse(data) {
    return JSON.parse(data);
  }

  getSomething() {
    // Gets something from remote API
    return response;
  }

}

module.exports.MyAPI = MyAPI;

index.js

const { MyAPI } = require('<my package>');
(async function(){
  try {
    const app = await new MyAPI(config.auth.token);
    console.log("App initialized!"); // Code never reaches this command
    console.log(app.getSomething());
  } catch (e) {...} // Handle the error
})()

日志充满了“已验证！” 并且代码永远不会到达console.log("App initialized!") 。 我已经看到了这个答案，但它对我没有帮助，因为我知道this正确地指的是 object。

用 resolve() 替换resolve(this) resolve()停止这个，但是await new MyAPI()解析为undefined并且我以后不能运行app.getSomething() 。

在非 Thenable class （例如new MyClass() ）中，它解析为 object 本身，因此可以对其进行进一步操作，所以为什么不能await new MyAPI()也解析为 ZA8CFDE6331BD59EB2AC96F8 本身，如构造函数?

Answer 1

只是不要那样做。 与其让你的对象成为 thenable，不如给它们一个简单地返回 promise 的init方法。 然后将它们用作

const app = new MyAPI(config.auth.token);
await app.init();
console.log("App initialized!");