export declare const getFirstDefined: <T>(record: Record<string, T | undefined>, keys: string[]) => T | undefined;
/**
 * Merge two objects together.
 *
 * Array properties are sorted and deduped.
 */
export declare const merge: <A, B>(obj: A, src: B) => {} & A & B;
/**
 * Like `merge`, but arrays are not deduped or sorted to preserve order.
 */
export declare const mergeRaw: <A, B>(obj: A, src: B) => {} & A & B;