React Native Elements

React Native Elements (published as @rneui/base and @rneui/themed) is a cross-platform UI toolkit that ships more than 30 ready-to-use components — buttons, cards, forms, overlays, ratings, tabs, and more — covering most of the pieces a React Native app needs to build a consistent interface. Each component is written in TypeScript, ships with its own test suite, and renders across iOS, Android, and React Native Web from the same source.

@rneui/base provides the unstyled, functional component implementations plus shared helpers like makeStyles and renderNode; @rneui/themed layers a configurable ThemeProvider (colors, spacing, per-component style overrides) on top, so teams can reskin the entire library from one config object instead of patching each component individually.

What You Get

• 30+ pre-built components (Button, Card, Avatar, BottomSheet, Overlay, SearchBar, Rating, SpeedDial, Tab/TabView, and more)
• A configurable ThemeProvider (@rneui/themed) for restyling the whole component set from one design-token object
• A built-in Icon component wrapping multiple vector-icon families (Feather, FontAwesome, Ionicons, Material) behind one API
• Full TypeScript typings for every component, prop, and theme shape
• A memoized makeStyles helper for computing StyleSheet styles from props/theme without unnecessary re-renders

Common Use Cases

• Bootstrapping the UI for a new React Native app without hand-building buttons, inputs, and cards from scratch
• Building cross-platform products that also ship a React Native Web build, using the same component code in-browser
• Applying a custom Theme object to @rneui/themed to match an existing brand design system
• Prototyping screens quickly via the official Expo demo app and Snack examples

Under The Hood

Architecture The repo is a Yarn workspaces monorepo (packages/base, packages/themed, plus example and scripts/docgen) versioned with Lerna. @rneui/base exports 30+ self-contained component directories from src/index.ts, each holding its component file, a .usage.tsx example, and a __tests__ folder; cross-cutting concerns (theming, style memoization, icon-family resolution, node rendering) live centrally in src/helpers/ (makeStyles.ts, renderNode.tsx, getIconType.tsx, colors.ts). @rneui/themed depends on @rneui/base and wraps it with a ThemeProvider that pushes a Theme object down through React context; base components accept that theme as an optional injected prop typed via a shared RneFunctionComponent generic, so each component works either standalone or theme-aware. This base/themed split is the core architectural decision — changing it touches the prop typing of every exported component.

Tech Stack Yarn 4 (Berry) workspaces, TypeScript, and React/React Native as peer dependencies. Runtime deps include color for color manipulation, deepmerge for theme merging, hoist-non-react-statics, and react-native-size-matters for responsive sizing, with react-native-safe-area-context as a peer dependency. Testing runs on @testing-library/react-native plus jest-native (test:ci uses jest --runInBand --coverage). The package builds via tsc --composite false plus copyfiles for bundling component image assets, and a separate website/ + scripts/docgen package generates the public docs site. CI is GitHub Actions–based (ci-checks, bleeding-edge-dist, Expo preview workflows, automated version bumps), with ESLint, Prettier, and Husky/lint-staged enforced at commit time.

Code Quality 45 test files sit under component-level __tests__ folders, exercised with @testing-library/react-native and coverage collection built into the jest scripts. Naming is consistent — every component is a PascalCase directory exporting typed Props interfaces — and TypeScript is used throughout, including shared generics like RneFunctionComponent and StringOmit for prop typing. Linting and formatting are enforced via ESLint/Prettier configs plus a Husky pre-commit hook running lint-staged. The main gap is velocity rather than rigor: the GitHub data shows low recent commit activity relative to the size and maturity of the codebase.

API Design The library’s main ergonomic choice is splitting unstyled primitives (@rneui/base) from a themeable layer (@rneui/themed), letting consumers either use components unstyled or theme the entire set from one config object — a more flexible pattern than libraries that are styled-by-default. The makeStyles hook gives a lightweight, memoized way to compute per-component styles from theme/props without extra re-renders, and the Icon component abstracts over several vector-icon font families behind a single consistent prop API, cutting down per-component icon integration work. Getting started requires two installs (@rneui/themed + @rneui/base) and wrapping the app in a ThemeProvider, which is modest but well-documented boilerplate rather than a truly novel technical approach.