/**
 * Performs a deep mutation of an existing object to equal a given source object.
 *
 * Adapted from this package: https://github.com/jeremyhewett/mutate-object
 * @param {object} destination - The object to mutate
 * @param {object} source - The object that the destination should be mutated to equal
 * @param {boolean} [preserveRootProps=true] - Whether undefined props on the root level should be deleted
 */
export declare function mutateObject(destination: any, source: any, preserveRootProps?: boolean): void;