/**
* @param {Uint8Array} parentKey
* @param {Uint8Array} chainCode
* @param {number} index
* @returns {Promise<{ keyData: Uint8Array; chainCode: Uint8Array }>}
*/
export function derive(parentKey: Uint8Array, chainCode: Uint8Array, index: number): Promise<{
keyData: Uint8Array;
chainCode: Uint8Array;
}>;