Revision 1030066 of ECMAScript Next support in Mozilla

<div>{{jsSidebar("New_in_JS")}}</div>

<p>ECMAScript Next refers to new features of the ECMA-262 standard (commonly referred to as <a href="/en-US/docs/Web/JavaScript">JavaScript</a>) introduced after ECMAScript 6 (ES2015). New versions of ECMAScript specifications are released yearly. This year, the ES2016 specification will be released and the ES2017 is the current ECMAScript draft specification.</p>

<p>You can see the latest proposals on the <a href="https://github.com/tc39/ecma262">tc39/ecma262</a> GitHub repository.</p>

<p>A channel for feedback on ECMAScript standards is <a href="https://mail.mozilla.org/listinfo/es-discuss">es-discuss</a>.</p>

<h2 id="ECMAScript_2016">ECMAScript 2016</h2>

<p>These ES2016 / ES7 features are implemented:</p>

<ul>
 <li>{{jsxref("Array.prototype.includes()")}} (Firefox 43)</li>
 <li>{{jsxref("TypedArray.prototype.includes()")}} (Firefox 43)</li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*">Generators</a> and <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Method_definitions">generator methods</a> are no longer constructable (Firefox 43)</li>
 <li>Proxy <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/enumerate">enumerate</a> handler removed (Firefox 47)</li>
 <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Exponentiation">Exponentiation operator</a> (Firefox Nightly, see {{bug(1243858)}} for remaining work)</li>
</ul>

<h2 id="Experimental_new_features">Experimental new features</h2>

<p>The following features are already implemented, but only available in the <a href="https://nightly.mozilla.org/">Firefox Nightly channel</a> and not yet included in a draft edition of an ECMAScript specification.</p>

<h3 id="Additions_to_the_ArrayBuffer_object">Additions to the <code>ArrayBuffer</code> object</h3>

<ul>
 <li>{{jsxref("ArrayBuffer.transfer()")}} (<a href="https://gist.github.com/lukewagner/2735af7eea411e18cf20">spec</a>)</li>
</ul>

<h3>Additions to the <code>Object</code> object</h3>

<ul>
 <li>{{jsxref("Object.values()")}} (Nightly)</li>
 <li>{{jsxref("Object.entries()")}} (Nightly)</li>
</ul>

<h3 id="New_TypedObject_objects">New TypedObject objects</h3>

<ul>
 <li><a href="https://github.com/dslomov-chromium/typed-objects-es7">Typed Objects draft</a></li>
</ul>

<h3 id="New_SIMD_objects">New SIMD objects</h3>

<ul>
 <li><a href="https://github.com/johnmccutchan/ecmascript_simd">SIMD specification draft and polyfill</a></li>
</ul>

<h3 id="Shared_Memory">New Shared Memory objects</h3>

<ul>
 <li>{{jsxref("SharedArrayBuffer")}}</li>
 <li>{{jsxref("Atomics")}}</li>
</ul>

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="https://www.ecmascript.org/">ECMAScript web site</a></li>
 <li><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1021376">Mozilla ES7 tracking bug</a></li>
 <li><a href="https://kangax.github.io/compat-table/esnext/">ECMAScript next support across browsers</a></li>
</ul>