npm packages

Create and open deep links universally

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Extract meaning from JS Errors

Simple and complete React Native testing utilities that encourage good testing practices.

Universal WHATWG Fetch API for Node, Browsers and React Native

Native-ESM powered web dev build tool

TypeScript execution environment and REPL for node.js, with source map support

Type-safe implementation of invariant with positionals.

Make a directory and its parents if needed - Think `mkdir -p`

Gracefully handle a Promise using async/await.

A Node.js bindings implementation for the W3C WebDriver and Mobile JSONWire Protocol

Validate plugin/preset options

Helper functions on Babel compilation targets

This package exports a few of the CSS variables that we use in Facebook projects. This is not the full list we have internally but focused on making available the minimum set needed by our open source projects.

Detect Browser, Engine, OS, CPU, and Device type/model from User-Agent & Client Hints data. Supports browser & node.js environment

get dimensions of any image file

Throttle the parallelism of an asynchronous (promise returning) function / functions

Helper to wrap functions inside a function call.

JS Object representation of a stack frame

Helper function to replace supers

Detect react-native-edge-to-edge package install

Detect if PWA is running in standalone mode

A collection of essential TypeScript types

Transpile JSX, TypeScript and esnext features on the fly with esbuild

A type-safe marriage of `EventTarget` and `EventEmitter`.

Minimal H(TTP) framework built for high performance and portability.

Compile ESNext Regular Expressions to ES5

Allow parsing of decorators

A collection of JavaScript globals for Babel internal usage

Generate an AST from a string template.