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---
id: javascript-environment-requirements
title: JavaScript Environment Requirements
layout: docs
category: Reference
permalink: docs/javascript-environment-requirements.html
---
React 18 (#4499) * [18] ReactDOM reference to createRoot/hydrateRoot (#4340) * [18] ReactDOM reference to createRoot/hydrateRoot * Update note about render and hydrate * Match the warning text * s/Render/render * [18] Update ReactDOMClient docs (#4468) * [18] Update ReactDOMClient docs * Remove ReactDOMClient where it's obvious * Update browser message * Update browser message note * Update based on feedback * Add react-dom/client docs * [18] Upgrade homepage examples (#4469) * [18] Switch code samples to createRoot (#4470) * [18] Switch code samples to createRoot * Feedback fixes * Feedback updates * [18] Use hydrateRoot and root.unmount. (#4473) * [18] Add docs for flushSync (#4474) * [18] Add flushSync to ReactDOM docs * Seb feedback * More Seb feedback * [18] Bump version to 18 (#4478) * [18] Update browser requirements (#4476) * [18] Update browser requirements * Update based on feedback * [18] Add stubs for new API references (#4477) * [18] Add stubs for new API references * Change order/grouping * [18] Redirect outdated Concurrent Mode docs (#4481) * [18] Redirect outdated Concurrent Mode docs * Use Vercel redirects instead * [18] Update versions page (#4482) * [18] Update version page * Fix prettier * [18] Update React.lazy docs (#4483) * [18] Add docs for useSyncExternalStore (#4487) * [18] Add docs for useSyncExternalStore * rm "optional" * [18] Add docs for useInsertionEffect (#4486) * [18] Add docs for useId (#4488) * [18] Add docs for useId * Update based on feedback * Add Strict Effects to Strict Mode (#4362) * Add Strict Effects to Strict Mode * Update with new thinking * [18] Update docs for useEffect timing (#4498) * [18] Add docs for useDeferredValue (#4497) * [18] Update suspense docs for unexpected fallbacks (#4500) * [18] Update suspense docs for unexpected fallbacks * Add inline code block * Feedback fixes * [18] Updated Suspense doc with behavior during SSR and Hydration (#4484) * update wording * wording * update events * Update content/docs/reference-react.md Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> * add link to selective hydration * remove some of the implementation details Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> * [18] renderToPipeableStream doc (#4485) * new streaming ssr api * add readable stream * code snippets * Rename strict effects / unsafe effects to use the reusable state terminology (#4505) * Add draft of 18 release post * Add links to speaker Twitter profiles * [18] Update upgrade guide * Fix typo in blog title * [18] Blog - add note for react native * [18] Add changelog info to blog posts * Edit Suspense for data fetching section * Update date * [18] Add links * Consistent title case * Update link to merged RFC * [18] Update APIs and links * [18] Add start/useTransition docs (#4479) * [18] Add start/useTransition docs * Updates based on feedback * [18] Generate heading IDs * Add note about Strict Mode * Just frameworks * Reorder, fix content * Typos * Clarify Suspense frameworks section * Revert lost changes that happened when I undo-ed in my editor Co-authored-by: salazarm <salazarm@users.noreply.github.com> Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> Co-authored-by: Sebastian Markbåge <sebastian@calyptus.eu> Co-authored-by: Andrew Clark <git@andrewclark.io> Co-authored-by: dan <dan.abramov@gmail.com>
3 years ago
React 18 supports all modern browsers (Edge, Firefox, Chrome, Safari, etc).
React 18 (#4499) * [18] ReactDOM reference to createRoot/hydrateRoot (#4340) * [18] ReactDOM reference to createRoot/hydrateRoot * Update note about render and hydrate * Match the warning text * s/Render/render * [18] Update ReactDOMClient docs (#4468) * [18] Update ReactDOMClient docs * Remove ReactDOMClient where it's obvious * Update browser message * Update browser message note * Update based on feedback * Add react-dom/client docs * [18] Upgrade homepage examples (#4469) * [18] Switch code samples to createRoot (#4470) * [18] Switch code samples to createRoot * Feedback fixes * Feedback updates * [18] Use hydrateRoot and root.unmount. (#4473) * [18] Add docs for flushSync (#4474) * [18] Add flushSync to ReactDOM docs * Seb feedback * More Seb feedback * [18] Bump version to 18 (#4478) * [18] Update browser requirements (#4476) * [18] Update browser requirements * Update based on feedback * [18] Add stubs for new API references (#4477) * [18] Add stubs for new API references * Change order/grouping * [18] Redirect outdated Concurrent Mode docs (#4481) * [18] Redirect outdated Concurrent Mode docs * Use Vercel redirects instead * [18] Update versions page (#4482) * [18] Update version page * Fix prettier * [18] Update React.lazy docs (#4483) * [18] Add docs for useSyncExternalStore (#4487) * [18] Add docs for useSyncExternalStore * rm "optional" * [18] Add docs for useInsertionEffect (#4486) * [18] Add docs for useId (#4488) * [18] Add docs for useId * Update based on feedback * Add Strict Effects to Strict Mode (#4362) * Add Strict Effects to Strict Mode * Update with new thinking * [18] Update docs for useEffect timing (#4498) * [18] Add docs for useDeferredValue (#4497) * [18] Update suspense docs for unexpected fallbacks (#4500) * [18] Update suspense docs for unexpected fallbacks * Add inline code block * Feedback fixes * [18] Updated Suspense doc with behavior during SSR and Hydration (#4484) * update wording * wording * update events * Update content/docs/reference-react.md Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> * add link to selective hydration * remove some of the implementation details Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> * [18] renderToPipeableStream doc (#4485) * new streaming ssr api * add readable stream * code snippets * Rename strict effects / unsafe effects to use the reusable state terminology (#4505) * Add draft of 18 release post * Add links to speaker Twitter profiles * [18] Update upgrade guide * Fix typo in blog title * [18] Blog - add note for react native * [18] Add changelog info to blog posts * Edit Suspense for data fetching section * Update date * [18] Add links * Consistent title case * Update link to merged RFC * [18] Update APIs and links * [18] Add start/useTransition docs (#4479) * [18] Add start/useTransition docs * Updates based on feedback * [18] Generate heading IDs * Add note about Strict Mode * Just frameworks * Reorder, fix content * Typos * Clarify Suspense frameworks section * Revert lost changes that happened when I undo-ed in my editor Co-authored-by: salazarm <salazarm@users.noreply.github.com> Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> Co-authored-by: Sebastian Markbåge <sebastian@calyptus.eu> Co-authored-by: Andrew Clark <git@andrewclark.io> Co-authored-by: dan <dan.abramov@gmail.com>
3 years ago
If you support older browsers and devices such as Internet Explorer which do not provide modern browser features natively or have non-compliant implementations, consider including a global polyfill in your bundled application.
React 18 (#4499) * [18] ReactDOM reference to createRoot/hydrateRoot (#4340) * [18] ReactDOM reference to createRoot/hydrateRoot * Update note about render and hydrate * Match the warning text * s/Render/render * [18] Update ReactDOMClient docs (#4468) * [18] Update ReactDOMClient docs * Remove ReactDOMClient where it's obvious * Update browser message * Update browser message note * Update based on feedback * Add react-dom/client docs * [18] Upgrade homepage examples (#4469) * [18] Switch code samples to createRoot (#4470) * [18] Switch code samples to createRoot * Feedback fixes * Feedback updates * [18] Use hydrateRoot and root.unmount. (#4473) * [18] Add docs for flushSync (#4474) * [18] Add flushSync to ReactDOM docs * Seb feedback * More Seb feedback * [18] Bump version to 18 (#4478) * [18] Update browser requirements (#4476) * [18] Update browser requirements * Update based on feedback * [18] Add stubs for new API references (#4477) * [18] Add stubs for new API references * Change order/grouping * [18] Redirect outdated Concurrent Mode docs (#4481) * [18] Redirect outdated Concurrent Mode docs * Use Vercel redirects instead * [18] Update versions page (#4482) * [18] Update version page * Fix prettier * [18] Update React.lazy docs (#4483) * [18] Add docs for useSyncExternalStore (#4487) * [18] Add docs for useSyncExternalStore * rm "optional" * [18] Add docs for useInsertionEffect (#4486) * [18] Add docs for useId (#4488) * [18] Add docs for useId * Update based on feedback * Add Strict Effects to Strict Mode (#4362) * Add Strict Effects to Strict Mode * Update with new thinking * [18] Update docs for useEffect timing (#4498) * [18] Add docs for useDeferredValue (#4497) * [18] Update suspense docs for unexpected fallbacks (#4500) * [18] Update suspense docs for unexpected fallbacks * Add inline code block * Feedback fixes * [18] Updated Suspense doc with behavior during SSR and Hydration (#4484) * update wording * wording * update events * Update content/docs/reference-react.md Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> * add link to selective hydration * remove some of the implementation details Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> * [18] renderToPipeableStream doc (#4485) * new streaming ssr api * add readable stream * code snippets * Rename strict effects / unsafe effects to use the reusable state terminology (#4505) * Add draft of 18 release post * Add links to speaker Twitter profiles * [18] Update upgrade guide * Fix typo in blog title * [18] Blog - add note for react native * [18] Add changelog info to blog posts * Edit Suspense for data fetching section * Update date * [18] Add links * Consistent title case * Update link to merged RFC * [18] Update APIs and links * [18] Add start/useTransition docs (#4479) * [18] Add start/useTransition docs * Updates based on feedback * [18] Generate heading IDs * Add note about Strict Mode * Just frameworks * Reorder, fix content * Typos * Clarify Suspense frameworks section * Revert lost changes that happened when I undo-ed in my editor Co-authored-by: salazarm <salazarm@users.noreply.github.com> Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> Co-authored-by: Sebastian Markbåge <sebastian@calyptus.eu> Co-authored-by: Andrew Clark <git@andrewclark.io> Co-authored-by: dan <dan.abramov@gmail.com>
3 years ago
Here is a list of the modern features React 18 uses:
- [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)
- [`Symbol`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol)
- [`Object.assign`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
React 18 (#4499) * [18] ReactDOM reference to createRoot/hydrateRoot (#4340) * [18] ReactDOM reference to createRoot/hydrateRoot * Update note about render and hydrate * Match the warning text * s/Render/render * [18] Update ReactDOMClient docs (#4468) * [18] Update ReactDOMClient docs * Remove ReactDOMClient where it's obvious * Update browser message * Update browser message note * Update based on feedback * Add react-dom/client docs * [18] Upgrade homepage examples (#4469) * [18] Switch code samples to createRoot (#4470) * [18] Switch code samples to createRoot * Feedback fixes * Feedback updates * [18] Use hydrateRoot and root.unmount. (#4473) * [18] Add docs for flushSync (#4474) * [18] Add flushSync to ReactDOM docs * Seb feedback * More Seb feedback * [18] Bump version to 18 (#4478) * [18] Update browser requirements (#4476) * [18] Update browser requirements * Update based on feedback * [18] Add stubs for new API references (#4477) * [18] Add stubs for new API references * Change order/grouping * [18] Redirect outdated Concurrent Mode docs (#4481) * [18] Redirect outdated Concurrent Mode docs * Use Vercel redirects instead * [18] Update versions page (#4482) * [18] Update version page * Fix prettier * [18] Update React.lazy docs (#4483) * [18] Add docs for useSyncExternalStore (#4487) * [18] Add docs for useSyncExternalStore * rm "optional" * [18] Add docs for useInsertionEffect (#4486) * [18] Add docs for useId (#4488) * [18] Add docs for useId * Update based on feedback * Add Strict Effects to Strict Mode (#4362) * Add Strict Effects to Strict Mode * Update with new thinking * [18] Update docs for useEffect timing (#4498) * [18] Add docs for useDeferredValue (#4497) * [18] Update suspense docs for unexpected fallbacks (#4500) * [18] Update suspense docs for unexpected fallbacks * Add inline code block * Feedback fixes * [18] Updated Suspense doc with behavior during SSR and Hydration (#4484) * update wording * wording * update events * Update content/docs/reference-react.md Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> * add link to selective hydration * remove some of the implementation details Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> * [18] renderToPipeableStream doc (#4485) * new streaming ssr api * add readable stream * code snippets * Rename strict effects / unsafe effects to use the reusable state terminology (#4505) * Add draft of 18 release post * Add links to speaker Twitter profiles * [18] Update upgrade guide * Fix typo in blog title * [18] Blog - add note for react native * [18] Add changelog info to blog posts * Edit Suspense for data fetching section * Update date * [18] Add links * Consistent title case * Update link to merged RFC * [18] Update APIs and links * [18] Add start/useTransition docs (#4479) * [18] Add start/useTransition docs * Updates based on feedback * [18] Generate heading IDs * Add note about Strict Mode * Just frameworks * Reorder, fix content * Typos * Clarify Suspense frameworks section * Revert lost changes that happened when I undo-ed in my editor Co-authored-by: salazarm <salazarm@users.noreply.github.com> Co-authored-by: Sebastian Silbermann <silbermann.sebastian@gmail.com> Co-authored-by: Sebastian Markbåge <sebastian@calyptus.eu> Co-authored-by: Andrew Clark <git@andrewclark.io> Co-authored-by: dan <dan.abramov@gmail.com>
3 years ago
The correct polyfill for these features depend on your environment. For many users, you can configure your [Browserlist](https://github.com/browserslist/browserslist) settings. For others, you may need to import polyfills like [`core-js`](https://github.com/zloirock/core-js) directly.