问使用BabelJS 6访问类的静态属性

EN

'use strict';

var _ = require('underscore');

class Model
{
    constructor(value) {
        this._value = value;
    }

    get value() {
        return this._value;
    }

    toJS() {
        return this.value;
    }
}

class ObjectModel extends Model
{
    static properties = {};

    constructor(value) {
        super(_.extend({}, new.target.properties, _.pick(value, _.keys(new.target.properties))));
    }
}

class PostModel extends ObjectModel
{
    static properties = {
        title: 'Hello'
        /* content: '<p>Lorem ipsum dolor sit amet</p>' */
    };
}

console.log(new PostModel({title: 'Nice day', aa: 11, bb: 22}).toJS());

$ babel app.js
SyntaxError: app.js: 'this' is not allowed before super()

class ObjectModel extends Model
{
    static properties = {};

    constructor(value) {
        if (0) { super(); }
        super(_.extend({}, this.constructor.properties, _.pick(value, _.keys(this.constructor.properties))));
    }
}

Uncaught TypeError: Cannot read property 'constructor' of undefined

$ babel --version
6.2.0 (babel-core 6.2.1)

$ cat .babelrc
{
    "presets": ["es2015", "stage-1"]
}

$ babel-doctor

Babel Doctor
Running sanity checks on your system. This may take a few minutes...

✔ Found config at /path/to/.babelrc
✔ No duplicate babel packages found
✔ All babel packages appear to be up to date
✔ You're on npm >=3.3.0

Everything looks all right!