在 ES6 模块中导出多个类 [英] Export multiple classes in ES6 modules

问题描述

我正在尝试创建一个导出多个 ES6 类的模块.假设我有以下目录结构:

I'm trying to create a module that exports multiple ES6 classes. Let's say I have the following directory structure:

my/
└── module/
    ├── Foo.js
    ├── Bar.js
    └── index.js

Foo.js 和 Bar.js 各自导出一个默认的 ES6 类:

Foo.js and Bar.js each export a default ES6 class:

// Foo.js
export default class Foo {
  // class definition
}

// Bar.js
export default class Bar {
  // class definition
}

我目前的 index.js 设置如下:

I currently have my index.js set up like this:

import Foo from './Foo';
import Bar from './Bar';

export default {
  Foo,
  Bar,
}

但是，我无法导入.我希望能够做到这一点，但找不到类:

However, I am unable to import. I want to be able to do this, but the classes aren't found:

import {Foo, Bar} from 'my/module';

在 ES6 模块中导出多个类的正确方法是什么?

What is the correct way to export multiple classes in an ES6 module?

推荐答案

在你的代码中试试这个:

Try this in your code:

import Foo from './Foo';
import Bar from './Bar';

// without default
export {
  Foo,
  Bar,
}

顺便说一句，你也可以这样做:

Btw, you can also do it this way:

// bundle.js
export { default as Foo } from './Foo'
export { default as Bar } from './Bar'
export { default } from './Baz'

// and import somewhere..
import Baz, { Foo, Bar } from './bundle'

使用export

export const MyFunction = () => {}
export const MyFunction2 = () => {}

const Var = 1;
const Var2 = 2;

export {
   Var,
   Var2,
}


// Then import it this way
import {
  MyFunction,
  MyFunction2,
  Var,
  Var2,
} from './foo-bar-baz';

与export default 的区别在于，您可以导出某些内容，并在导入时应用名称:

The difference with export default is that you can export something, and apply the name where you import it:

// export default
export default class UserClass {
  constructor() {}
};

// import it
import User from './user'

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