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Spreads: Common Errors & Fixes

Spreads now overwrite properties instead of inferring unions

Spreads no longer conflate unions into a single object

Spreads no longer assume that all optional properties exist

Spreads no longer assume that all objects are exact

Spreads no longer become any when spreading an object with an indexer

Performant by Design

Flow prevents exponential explosion induced through control flow

Flow errors on unions in computed properties

Next Steps

That’s all!




The official publication for the Flow static type checker for JavaScript. Code faster. Code smarter. Code confidently.

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