ES6 functionality

Does not apply to latest Totara versions

This page only applies to Totara 16 and earlier. Totara 17 dropped IE support, and Totara 18 removed the polyfills completely.

In Totara 17, all JS features are available so long as they are natively supported by all supported browsers.

Totara supports a small set of ES6 and later features despite the fact that not all of our supported browsers provide there features natively. We achieve this by using a combination of core-js polyfills and those provided on https://developer.mozilla.org.

All ES6+ polyfils have been added to lib/javascript_polyfill/src/ and are included on every page when using IE11.

Available polyfills

Polyfill	Functional overview	Implementation	Available since Totara version

Polyfill	Functional overview	Implementation	Available since Totara version
Array.find	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find	core-js	13
Array.findIndex	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex	core-js	13
Array.from	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from	core-js	14
Array.includes	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes	core-js	13
CustomEvent	https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent	On MDN overview page	12
Element.closest	https://developer.mozilla.org/en-US/docs/Web/API/Element/closest	On MDN overview page	12
Element.matches	https://developer.mozilla.org/en-US/docs/Web/API/Element/matches	On MDN overview page	12
Element.remove	https://developer.mozilla.org/en-US/docs/Web/API/ChildNode/remove	On MDN overview page	12
Fetch API	https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API	https://github.com/github/fetch	12
Map	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map	core-js	14
NodeList.forEach	https://developer.mozilla.org/en-US/docs/Web/API/NodeList/forEach	core-js	13
Number.isFinite	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinite	core-js	13
Number.isInteger	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger	core-js	13
Number.isNaN	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN	core-js	13
Number.parseFloat	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseFloat	core-js	13
Number.parseInt	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseInt	core-js	13
Object.assign	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign	core-js	12
Object.create	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create	core-js	14
Object.entries	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries	core-js	13
Object.values	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values	core-js	13
Promise	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise	https://github.com/stefanpenner/es6-promise	12
Set	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set	core-js	14
String.startsWith	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith	core-js	12
String.endsWith	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith	core-js	12
String.fromCodePoint	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint	core-js	14
String.includes	https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes	core-js	13