如何在ecmascript-6中导入模块？

Question

I want to import different module to my module in ecma script 6. For example:

import rest from 'rest';

export function client() {

    // some logic

}

If I will change the import statement to classic:

var rest = require('rest');

everything is working fine. Any ideas?

Answer 1

I am not no expert but import is similar to require in many ways, but the key difference are:

• you can import selective items using import ( guess this is close to python), but with require , you export only a single module as a namespace, everything else is it's sub-modules.

• second is, require is more of of node.js thingy(though you can bring it into browser using browserify ),, but import is now a native feature of ES6, ie browsers that support ES6, import would work

Example from lukehoban's es6features to re-enforce my first point:

// lib/math.js
export function sum(x, y) {
  return x + y;
}
export var pi = 3.141593;

// app.js
import * as math from "lib/math";
alert("2π = " + math.sum(math.pi, math.pi));

// otherApp.js
import {sum, pi} from "lib/math";
alert("2π = " + sum(pi, pi));

//Some additional features include export default and export *:

// lib/mathplusplus.js
export * from "lib/math";
export var e = 2.71828182846;
export default function(x) {
    return Math.log(x);
}

// app.js
import ln, {pi, e} from "lib/mathplusplus";
alert("2π = " + ln(e)*pi*2);

Answer 2

This is an answer for my question, but if you want to know how to import other files please refer to the answer given by user @mido or for example check this page: http://www.2ality.com/2014/09/es6-modules-final.html

So comment from @Felix King has directed me to the right answer. As Felix suggested, rest module doesn't have default export function so it should be imported like that:

import * as rest from 'rest';

So it depends from a module, how it is written. For example "mime" interceptor module which is included in rest can be included by:

import mime from 'rest/interceptor/mime';