Ecmascript 6 ES6：测试在浏览器中通过，在phantomJS中失败，“找不到变量：反射”

我正在为js库重写ES6

class VerbalExpression extends RegExp {
    // snipped for brevity
}

/**
 * Alias for the constructor
 * @return {VerbalExpression} new instance of VerbalExpression
 */
function instantiate() {
    return new VerbalExpression();
}

// UMD (Universal Module Definition)
// https://github.com/umdjs/umd
if (typeof module !== 'undefined' && module.exports) { // CommonJS
    module.exports = instantiate;
} else if (typeof define === 'function' && define.amd) { // AMD Module
    define('VerEx', [], () => VerbalExpression);
} else { // Browser
    this.VerEx = instantiate;
}

当我在浏览器中运行测试时，它们都通过了

但是，当我在终端中运行测试时，会出现错误

❯ npm test

verbal-expressions@0.3.0 test /Users/shreyasminocha/dev/open source/JSVerbalExpressions
grunt test

Running "qunit:files" (qunit) task
Testing test/index.html FFFFFFFFFFFFFFFFFFFF
>> something
>> Message: Died on test #1 global code@file:///Users/shreyasminocha/dev/open%20source/JSVerbalExpressions/test/tests.js:7:5: Can't find variable: Reflect
>> Actual: null
>> Expected: undefined
>> ExtendableBuiltin@file:///Users/shreyasminocha/dev/open%20source/JSVerbalExpressions/dist/verbalexpressions.js:11:31
>> VerbalExpression@file:///Users/shreyasminocha/dev/open%20source/JSVerbalExpressions/dist/verbalexpressions.js:59:130
>> instantiate@file:///Users/shreyasminocha/dev/open%20source/JSVerbalExpressions/dist/verbalexpressions.js:588:32
>> somethingTest@file:///Users/shreyasminocha/dev/open%20source/JSVerbalExpressions/test/tests.js:8:26

...

Warning: 20 tests completed with 20 failed, 0 skipped, and 0 todo.
20 assertions (in 91ms), passed: 0, failed: 20 Use --force to continue.

注意：我正在编译的es6代码上运行测试，也就是说，我在运行测试之前运行babel

---

我猜这与幻影有关。我如何在终端通过测试？我错过什么了吗？有什么解决办法吗？

稳定的PhantomJS不支持ES6，也不再处于开发阶段，如果可能的话，迁移到PhantomJS的灵感来源于它。

我如何使用Puppeter with grunt运行Qunit测试？对不起，我总是想当然地访问Google。。。这有帮助吗？