Narrowed is fail when use as T #36613

export type IGunEpubNode = {
	timestamp: number,
	exists: false,
} | {
	timestamp: number,
	exists: true,

	filename: string,
	base64: string,
}

export function checkGunData<T extends IGunEpubNode>(data: T)
{
	if (data && data.timestamp)
	{
		if (data.exists)
		{
			let { base64, filename, exists, timestamp } = data;

			return true;
		}
	}

	return null;
}

checkGunData(data: IGunEpubNode)

checkGunData<T extends IGunEpubNode>(data: T)
checkGunData(data: IGunEpubNode)

checkGunData<T extends IGunEpubNode>(data: T)