use babel-node to run javascript(.js) file inside docker

[huan]

When we run mybot.js by Docker, we might get this error message:

Executing node mybot.js
/bot/mybot.js:1
import {
^^^^^^
SyntaxError: Unexpected token import

This is because Wechaty use node instead of babel to run js code, which does not support import.

Solution:

use Babel Node to run javascript code inside docker to support ES6/7.

Thanks @ jaf(weixin://wxwswjws) report this.

[huan]

Let's use babel-node by default, and use node only when NODE_ENV is production.
See: http://stackoverflow.com/questions/16978256/what-is-node-env-in-express

According to http://babeljs.io/docs/usage/cli/#babel-node

Not meant for production use
You should not be using babel-node in production. It is unnecessarily heavy, with high memory usage due to the cache being stored in memory. You will also always experience a startup performance penalty as the entire app needs to be compiled on the fly.

Check out the example Node.js server with Babel for an idea of how to use Babel in a production deployment.

[huan]

Done.

https://circleci.com/gh/Chatie/wechaty/1661

ok 3 javascript es6 import should success
ok 4 javascript es6 import with NODE_ENV=production should fail