<p dir="auto">I have this wired bug since I update from v0.15 to v2.4.4.</p>
<p dir="auto">This is my classes:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="class ParentClass {
  constructor() {}
}

// This is my ChildClass
class ChildClass extends ParentClass {
  constructor() {
    super();
  }
}"><pre class="notranslate"><code class="notranslate">class ParentClass {
  constructor() {}
}

// This is my ChildClass
class ChildClass extends ParentClass {
  constructor() {
    super();
  }
}
</code></pre></div>
<p dir="auto">Compiles to:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="&quot;use strict&quot;;

var _inherits = function (child, parent) {
  child.prototype = Object.create(parent &amp;&amp; parent.prototype, {
    constructor: {
      value: child,
      enumerable: false,
      writable: true,
      configurable: true
    }
  });
  if (parent) child.__proto__ = parent;
};

var ParentClass = function ParentClass() {};

// This is my ChildClass
var ChildClass = (function () {
  // This is my ChildClassvar _ParentClass = ParentClass;
  var ChildClass = function ChildClass() {
    _ParentClass.call(this);
  };

  _inherits(ChildClass, _ParentClass);

  return ChildClass;
})();"><pre class="notranslate"><code class="notranslate">"use strict";

var _inherits = function (child, parent) {
  child.prototype = Object.create(parent &amp;&amp; parent.prototype, {
    constructor: {
      value: child,
      enumerable: false,
      writable: true,
      configurable: true
    }
  });
  if (parent) child.__proto__ = parent;
};

var ParentClass = function ParentClass() {};

// This is my ChildClass
var ChildClass = (function () {
  // This is my ChildClassvar _ParentClass = ParentClass;
  var ChildClass = function ChildClass() {
    _ParentClass.call(this);
  };

  _inherits(ChildClass, _ParentClass);

  return ChildClass;
})();
</code></pre></div>
<p dir="auto">You can see the comment <code class="notranslate">// This is my ChildClass</code> is duplicate and break the definition of <code class="notranslate">var _ParentClass = ParentClass;</code>:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="ReferenceError: _ParentClass is not defined"><pre class="notranslate"><code class="notranslate">ReferenceError: _ParentClass is not defined
</code></pre></div>
<p dir="auto">Quick fix: turning off <code class="notranslate">comment</code> in format option.</p>
<blockquote>
<p dir="auto">Issue originally made by <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/SimenB/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/SimenB">@SimenB</a></p>
</blockquote>
<h3 dir="auto">Bug information</h3>
<ul dir="auto">
<li><strong>Babel version:</strong> 6.3.13</li>
<li><strong>Node version:</strong> 4.2.3</li>
<li><strong>npm version:</strong> 3.5.2</li>
</ul>
<h3 dir="auto">Input code</h3>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="import meep from 'meep';

meep('meep');"><pre class="notranslate"><code class="notranslate">import meep from 'meep';

meep('meep');
</code></pre></div>
<h3 dir="auto">Description</h3>
<p dir="auto">The <code class="notranslate">default</code> keyword is not wrapped in quotes. It's wrapped correctly in the <code class="notranslate">_interopRequireDefault</code>-function, but usage is not wrapped (it's <code class="notranslate">(0, _meep2.default)</code> instead of <code class="notranslate">(0, _meep2['default'])</code>)</p>
<p dir="auto">I'm unsure which of <code class="notranslate">es3-member-expression-literals</code> and <code class="notranslate">es3-property-literals</code> should add the quotes.</p>
<p dir="auto">I created a gist reproducing the problem: <a href="https://gist.github.com/SimenB/0b84772c01305e5485f3">https://gist.github.com/SimenB/0b84772c01305e5485f3</a></p>