/**
 * Copy `obj` without `keys`. Spread-then-delete so Immer drafts are not mutated in place.
 */
export declare function omit<T extends object>(obj: T, keys: string | string[]): T;
/**
 * Deep equality for JSON-like values (slides, plain objects, arrays).
 * Key order does not matter; array order does. Cycles are compared by pairing.
 */
export declare function isEqual(a: unknown, b: unknown): boolean;
export declare function arraysEqual<T>(a: readonly T[] | null | undefined, b: readonly T[] | null | undefined): boolean;