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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

PolyfillFunctional overviewImplementationAvailable since Totara version

Array.find

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findcore-js13
Array.findIndexhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndexcore-js13
Array.fromhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fromcore-js14
Array.includeshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includescore-js13
CustomEventhttps://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEventOn MDN overview page12
Element.closesthttps://developer.mozilla.org/en-US/docs/Web/API/Element/closestOn MDN overview page12
Element.matcheshttps://developer.mozilla.org/en-US/docs/Web/API/Element/matchesOn MDN overview page12
Element.removehttps://developer.mozilla.org/en-US/docs/Web/API/ChildNode/removeOn MDN overview page12
Fetch APIhttps://developer.mozilla.org/en-US/docs/Web/API/Fetch_APIhttps://github.com/github/fetch12
Maphttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Mapcore-js14
NodeList.forEachhttps://developer.mozilla.org/en-US/docs/Web/API/NodeList/forEachcore-js13
Number.isFinitehttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isFinitecore-js13
Number.isIntegerhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isIntegercore-js13
Number.isNaNhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaNcore-js13
Number.parseFloathttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseFloatcore-js13
Number.parseInthttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/parseIntcore-js13
Object.assignhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assigncore-js12
Object.createhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/createcore-js14
Object.entrieshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entriescore-js13
Object.valueshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/valuescore-js13
Promisehttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promisehttps://github.com/stefanpenner/es6-promise12
Sethttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Setcore-js14
String.startsWithhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWithcore-js12
String.endsWithhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWithcore-js12
String.fromCodePointhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePointcore-js14
String.includeshttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includescore-js13