export interface RecursiveAssignOptions {
    /**
     * Whether to remove keys in **target** that don't exist in **source**.
     */
    removeKeys?: boolean;
}
/**
 * Recursively assign an object to another object, assigning keys in child objects
 * instead of completely overwriting them.
 * @param target The target object to assign keys to.
 * @param source The sources to get values from.
 * @param options Options for the assign operation.
 */
export declare function recursiveAssign(target: any, source: any, options?: RecursiveAssignOptions): void;