babel 使用记录

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//
$ echo '{ "presets": ["es2015","react"] }' > .babelrc

# ES2015转码规则
$ npm install --save-dev babel-preset-es2015
# react转码规则
$ npm install --save-dev babel-preset-react
# ES7不同阶段语法提案的转码规则（共有4个阶段），选装一个
$ npm install --save-dev babel-preset-stage-0
$ npm install --save-dev babel-preset-stage-1
$ npm install --save-dev babel-preset-stage-2
$ npm install --save-dev babel-preset-stage-3

//
$ npm install --global babel-cli
--------------------------------------------------------------
//
$ babel-node
> [1,2,3].map(x => x * x)
    [ 1, 4, 9 ]
--------------------------------------------------------------
// point.js
export class Point {
    constructor(x, y) {
        this.x = x;
        this.y = y;
    }
}
if (require.main === module) {
    let pt = new Point(7,4);
    console.log(`My point: ${JSON.stringify(pt)}`);
}

$ babel-node point.js 
  My point: {"x":7,"y":4}
--------------------------------------------------------------

http://babeljs.io/docs/setup/#node

http://www.2ality.com/2015/03/babel-on-node.html

http://www.ruanyifeng.com/blog/2016/01/babel.html