/** Pick specified keys from an object. */
export declare function pick<T extends Record<string, any>>(obj: T, keys: string[]): Partial<T>;
/** Return a shallow copy of the object without the specified keys. */
export declare function omit<T extends Record<string, any>>(obj: T, keys: string[]): Partial<T>;
/** Deep-equal comparison for plain objects, arrays, and primitives. */
export declare function isEqual(a: unknown, b: unknown): boolean;
/** Check whether a value is a plain object (not null, array, Date, etc.). */
export declare function isPlainObject(value: unknown): value is Record<string, any>;
/** Random integer in [min, max] (inclusive on both ends, same as lodash/random). */
export declare function random(min: number, max: number): number;
/**
 * Deep clone that preserves functions (unlike structuredClone which throws
 * DataCloneError on functions). Used for claim step arrays that contain
 * callback functions.
 */
export declare function cloneDeep<T>(value: T): T;
/** Fisher-Yates shuffle — returns a new array, does not mutate the input. */
export declare function shuffle<T>(arr: T[]): T[];
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