/**
 * Assigns default values for undefined properties.
 * Properties that are already defined in the target are not overwritten.
 *
 * @param target - The target object
 * @param sources - The default value sources (leftmost has highest priority)
 * @returns New object with defaults applied
 *
 * @example
 * defaultsFast({ a: 1 }, { a: 2, b: 2 }, { c: 3 })
 * // { a: 1, b: 2, c: 3 }
 */
export declare function defaultsFast<T extends object>(...sources: T[]): T;
/**
 * Like defaultsFast, but recursively assigns default values for nested objects.
 *
 * @param target - The target object
 * @param sources - The default value sources
 * @returns New object with deep defaults applied
 *
 * @example
 * defaultsDeepFast({ a: { b: 1 } }, { a: { b: 2, c: 3 } })
 * // { a: { b: 1, c: 3 } }
 */
export declare function defaultsDeepFast<T extends object>(...sources: T[]): T;
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