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facebook/reactOfficial

This handles React's multi-channel testing setup so you don't have to remember which yarn command maps to which release channel. You can run tests against source, experimental, stable, www-modern, or www-classic with simple arguments like `/test experimental ReactFiberHooks`. The skill enforces the --silent and --no-watchman flags that prevent common sandboxing issues. It also reminds you about the two www variants when testing __VARIANT__ flags, which is easy to forget. If you're working on React core and need to verify behavior across different build configurations, this saves you from context-switching to documentation every time you want to run a test suite.

installs: 1.1K
GitHub stars: 246.5K
last updated: Jul 14, 2026

Install

$ npx -y skills add facebook/react --skill test --agent claude-code

Installs into .claude/skills of the current project.

Files

Run tests for the React codebase.

Arguments:

$ARGUMENTS: Channel, flags, and test pattern

Usage Examples:

/test ReactFiberHooks - Run with source channel (default)
/test experimental ReactFiberHooks - Run with experimental channel
/test www ReactFiberHooks - Run with www-modern channel
/test www variant false ReactFiberHooks - Test VARIANT=false
/test stable ReactFiberHooks - Run with stable channel
/test classic ReactFiberHooks - Run with www-classic channel
/test watch ReactFiberHooks - Run in watch mode (TDD)

Release Channels:

(default) - Source/canary channel, uses ReactFeatureFlags.js defaults
experimental - Source/experimental channel with EXPERIMENTAL flags = true
www - www-modern channel with VARIANT flags = true
www variant false - www channel with VARIANT flags = false
stable - What ships to npm
classic - Legacy www-classic (rarely needed)

Instructions:

Parse channel from arguments (default: source)
Map to yarn command:
- (default) → yarn test --silent --no-watchman <pattern>
- experimental → yarn test -r=experimental --silent --no-watchman <pattern>
- stable → yarn test-stable --silent --no-watchman <pattern>
- classic → yarn test-classic --silent --no-watchman <pattern>
- www → yarn test-www --silent --no-watchman <pattern>
- www variant false → yarn test-www --variant=false --silent --no-watchman <pattern>
Report test results and any failures

Hard Rules:

Use --silent to see failures - This limits the test output to only failures.
Use --no-watchman - This is a common failure in sandboxing.

Common Mistakes:

Running without a pattern - Runs ALL tests, very slow. Always specify a pattern.
Forgetting both www variants - Test www AND www variant false for __VARIANT__ flags.
Test skipped unexpectedly - Check for @gate pragma; see feature-flags skill.

SKILL.md on GitHub

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Details

Repository: github.com/facebook/react
Categories: Frontend Development, Testing & QA