JavaScript Environment

Important: The Vega SDK supports many of the React Native version 0.72 components and APIs. You can use the supported components and APIs in the same manner as an ordinary React Native app. This page lists a specific React Native feature supported by the Vega SDK and contains React Native v72 documentation from the reactnative.dev website created by Meta and other contributors and licensed under the Attribution 4.0 International License. For more information about React Native v72, see the React Native documentation, version 0.72. For the most current feature information, see the Release Notes.

JavaScript Runtime

When using React Native for Kepler, you will always use Hermes, an open-source JavaScript engine optimized for React Native. On Kepler, we don't support using JavaScriptCore or Chrome (including V8) itself for tasks such as debugging.

Hermes is mainly used in the context of React Native and its roadmap follows the versions of React Native. Your Hermes version depends on the React Native version you are using, for example, 0.72.

JavaScript Syntax Transformers

Syntax transformers make writing code more enjoyable by allowing you to use new JavaScript syntax without having to wait for support on all interpreters.

React Native ships with the Babel JavaScript compiler. Check Babel documentation on its supported transformations for more details.

A full list of React Native's enabled transformations can be found in @react-native/babel-preset.

Transformation	Code
ECMAScript 5
ECMAScript 2015 (ES6)
ECMAScript 2016 (ES7)
ECMAScript 2017 (ES8)
ECMAScript 2018 (ES9)
ECMAScript 2019 (ES10)
ECMAScript 2020 (ES11)
ECMAScript 2022 (ES13)
Stage 1 Proposal
Miscellaneous

Polyfills

Many standard functions are also available on all the supported JavaScript runtimes.

Browser

CommonJS require
[console.{log, warn, error, info, trace, table, group, groupEnd}](https://developer.chrome.com/devtools/docs/console-api)
XMLHttpRequest, fetch
{set, clear}{Timeout, Interval, Immediate}, {request, cancel}AnimationFrame

ECMAScript 2015 (ES6)

Array.from
Array.prototype.{[find](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find), [findIndex](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex)}
Object.assign
String.prototype.{[startsWith](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith), [endsWith](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith), [repeat](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat), [includes](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes)}

ECMAScript 2016 (ES7)

Array.prototype.[includes](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes)

ECMAScript 2017 (ES8)

Object.{[entries](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries), [values](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values)}

Specific

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Last updated: Sep 30, 2025