ES6导入，导出=错误：参数无效

Question

i have this setup

file1.js:

export function foo1() { ... };

file2.js:

export function foo2() { ... }

hook.js:

 import {foo1} from './file1';
 import {foo2} from './file2';

 export {foo1, foo2};

Now when i want to import from my hook:

app.js

import { foo1 } from '../data/hook.js';

i get this:

Error: invalid argument

When calling foo1. (The function has no arguments/parameters).

Anyone know what's the problem?

UPDATE:

I also get the invalid argument when importing foo1 directly from file1. Is this a Babel Problem?

My .babelrcb( i use test as environment):

"env": {
  "targets": {
    "node": "4.8.4"
  },
  "test": {
    "presets": ["env"]
  },
}

UPDATE AND SOLUTION:

It turned out the import was correct, thx for all the guys who helped me on this Q. The problem was due to a Promise inside the function foo1 which caused the import to fail:

browser.waitUntil(..); // see http://webdriver.io/api/utility/waitUntil.html

Answer 1

you have to add ./ in import and default in the export

File1.js

export default function foo1()

hook.js

import {foo1} from './File1'

otherwise, it will search for File1 in node_modules

reference

Answer 2

Function body is missing on file1 and file2.

file1.js:

export function foo1() {};

file2.js:

export function foo2() {};

On hook.js, you should export default.

import {foo1} from './file1';
import {foo2} from './file2';

export default {foo1, foo2};