mergeSizes = (...sizes) => {
	/** @type {SplitChunksSizes} */
	let merged = {};
	for (let i = sizes.length - 1; i >= 0; i--) {
		merged = Object.assign(merged, sizes[i]);
	}
	return merged;
}
@param {...(SplitChunksSizes | undefined)} sizes the sizes
@returns {SplitChunksSizes} the merged sizes