// Use when you need to run tests for React core. Supports source, www, stable, and experimental channels.
| name | test |
| description | Use when you need to run tests for React core. Supports source, www, stable, and experimental channels. |
Run tests for the React codebase.
Arguments:
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 defaultsexperimental - Source/experimental channel with EXPERIMENTAL flags = truewww - www-modern channel with VARIANT flags = truewww variant false - www channel with VARIANT flags = falsestable - What ships to npmclassic - Legacy www-classic (rarely needed)Instructions:
yarn test --silent --no-watchman <pattern>yarn test -r=experimental --silent --no-watchman <pattern>yarn test-stable --silent --no-watchman <pattern>yarn test-classic --silent --no-watchman <pattern>yarn test-www --silent --no-watchman <pattern>yarn test-www --variant=false --silent --no-watchman <pattern>Hard Rules:
Common Mistakes:
www AND www variant false for __VARIANT__ flags.@gate pragma; see feature-flags skill.Use when adding new error messages to React, or seeing "unknown error code" warnings.
Use when feature flag tests fail, flags need updating, understanding @gate pragmas, debugging channel-specific test failures, or adding new flags to React.
Use when you have lint errors, formatting issues, or before committing code to ensure it passes CI.
Use when you need to check feature flag states, compare channels, or debug why a feature behaves differently across release channels.
Use when you need to run Flow type checking, or when seeing Flow type errors in React code.
Use when you want to validate changes before committing, or when you need to check all React contribution requirements.