flow

Static type checking for React code across DOM and native platforms. Four renderer options cover standard DOM, browser-specific code, React Native, and Fabric environments Run yarn flow with optional renderer argument; use yarn flow-ci for comprehensive but slower checks Reports type errors with file locations to help identify and fix issues quickly Watch for common pitfalls: missing renderer specification, unexamined $FlowFixMe suppressions, and incorrect type imports

npx skills add https://github.com/facebook/react --skill flow

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Flow Type Checking

Arguments:

$ARGUMENTS: Renderer to check (default: dom-node)

Renderers

Renderer	When to Use
`dom-node`	Default, recommended for most changes
`dom-browser`	Browser-specific DOM code
`native`	React Native
`fabric`	React Native Fabric

Instructions

Run yarn flow $ARGUMENTS (use dom-node if no argument)
Report type errors with file locations
For comprehensive checking (slow), use yarn flow-ci

Common Mistakes

Running without a renderer - Always specify or use default dom-node
Ignoring suppressions - Check if $FlowFixMe comments are masking real issues
Missing type imports - Ensure types are imported from the correct package

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