Importing the class results in an undefined outcome

In the process of developing my Vue app, I'm focusing on creating some helper classes:

File a.js:

export default class Base {//...}

File b.js:

import Base from "./a"
export default class Middle extends Base { // ... }

File c.js:

import Middle from "./b" // Middle here is undefined
export default class Final extends Middle { // ... }}

Whenever I try to import Middle, it shows up as undefined and throws an error stating

Uncaught TypeError: Super expression must either be null or a function
when extending with extends Middle

I've attempted another approach like this:

let Middle = class Middle .... 
export default Middle

Even though theoretically it should work, it did not resolve the issue for me.

My goal is to create a component that functions as a standalone library using:

vue-cli-service build --target lib

Answer №1

After some investigation, I discovered that the issue was related to a recursion error. Within the Base class, there was a factory method that would parse JSON data and output an instance of the Final class. As a result, it was necessary to import the Final classes into the Base class' file.

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