//@filename: file.tsx
//@jsx: preserve
declare module JSX {
	interface Element { }
	interface IntrinsicElements {
		test1: Attribs1;
	}
}
interface Attribs1 {
	c1?: (x: string) => void;
}

// OK
<test1 c1={(x) => x.length} />; // OK
<test1 data-c1={(x) => x.leng} />; // OK


// Errors
<test1 c1={(x) => x.leng} />; // Error, no leng on 'string'