refactor test import path, remove redundancy index.js

[paranoidjk]

ref: react-component/tree-select#62

踩了个坑，nodejs 读目录会优先尝试 pkg.main, 失败才会 fallback 到 index.js

https://github.com/nodejs/node/blob/master/lib/module.js#L115

所以用例里面 import TreeSelect from '..'; 会优先引用到 lib。

cc @react-component/admin

• tree-select

[yesmeck]

index.js 原来是给这里用的 https://github.com/react-component/rc-tools/blob/f162f2858e9008616fb344478cd44332cffc77d7/lib/getWebpackCommonConfig.js#L25

[paranoidjk]

其实就是为了给 example 或者 test 里面 import Foo from 'rc-foo' 来做 alias 的...

@yesmeck 默认 alias 做一个 fallback ， 先取 /index.js , 再取 /src/index.js 吧

[paranoidjk]

@yesmeck 或者统一用 pkg.config.entry? #14

[paranoidjk]

react-component/rc-tools@c705b6d

[paranoidjk]

Goal

• rc-component maintainer wirte import path just like the user's way in example demo.
• but make it actually use the src file

Proposal

import { foo } from 'rc-component'; // will redirect to import { foo } from 'rc-component/index.js' or import { foo } from 'rc-component/src/index.js'

import foo from 'rc-component/lib/foo'; // will redirect to import foo from 'rc-component/src/foo.js' 

done in react-component/rc-tools@c1a01a5...53592b7