javascript - babel を使用したシンプルな ES7 デコレータ

Question

このコードを実行できません: https://www.npmjs.com/package/core-decorators#readonly

私はgulpとbabelを使用しています。私はpackage.jsonを持っています

{
  "name": "my-first-decorator",
  "version": "0.0.1",
  "dependencies": {
    "core-decorators": "^0.8.1"
  },
  "devDependencies": {
    "babel-plugin-transform-class-properties": "^6.0.14",
    "babel-plugin-transform-decorators": "^6.0.14",
    "babel-preset-es2015": "^6.1.2",
    "babelify": "^7.2.0",
    "browserify": "^12.0.1",
    "gulp": "^3.9.0",
    "vinyl-source-stream": "^1.1.0"
  }
}

そして私はgulpfile.jsを持っています

var gulp = require('gulp');
var browserify = require('browserify');
var babelify = require('babelify');
var source = require('vinyl-source-stream');

gulp.task('default', function () {
    return browserify({entries: 'app.js', extensions: ['.js'], debug: true})
        .transform('babelify', {
            presets: ['es2015'],
            plugins: ['transform-class-properties', 'transform-decorators']
        })
        .bundle()
        .pipe(source('bundle.js'))
        .pipe(gulp.dest('dist'));
});

私のapp.js

import { readonly } from 'core-decorators';

class Meal {
  @readonly
  entree = 'steak';
}

var dinner = new Meal();
dinner.entree = 'salmon';
// Cannot assign to read only property 'entree' of [object Object]

コンソールに次のように書き込みます。

$ npm install
$ gulp

ブラウザを開きますが、コンソールは空です。[object Object] の読み取り専用プロパティ 'entree' に割り当てることはできません

コンパイル後の私のアプリ:

var _coreDecorators = require('core-decorators');

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Meal = function Meal() {
  _classCallCheck(this, Meal);
};

var dinner = new Meal();
dinner.entree = 'salmon';
// Cannot assign to read only property 'entree' of [object Object]