如何导出ES6类并在另一个模块中构造它的实例？

Question

Using Node.js version 7.7.2, I'd like to define and export an ES6 class from a module like this:

// Foo.js
class Foo {
    construct() {
        this.bar = 'bar';
    }
}
module.exports = Foo;

And then import the class into another module and construct an instance of said class like this:

// Bar.js
require('./foo');
var foo = new Foo();
var fooBar = foo.bar;

However, this syntax does not work. Is what I am trying to do possible, and if so, what is the correct syntax to achieve this?

Thanks.

Answer 1

You have to use regular node module syntax for this.

You have a few mistakes in your sample code. First, the class should not be followed by () . Also, a class constructor should be constructor not construct . Look at the below foo.js for proper syntax.

foo.js

class Foo {
  constructor () {
    this.foo = 'bar';
  }
}

module.exports = Foo;

bar.js

const Foo = require('./foo');

const foo = new Foo();

console.log(foo.foo); // => bar

Answer 2

// Foo.js
export class Foo() {
    construct() {
        this.foo = 'bar';
    }
}

notice keyword EXPORT