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React components with multiple root elements are not supported #20356

@xMihai

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@xMihai

React 16 components can have multiple root elements.

const Items = ({ items }: MyProps) => items.map(item => <div key={item.id}>{item.name}</div>)

However, TypeScript will break with:
error TS2605: JSX element type 'Element[]' is not a constructor function for JSX elements. Property 'render' is missing in type 'Element[]'.

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