/** Shared empty sentinel so null/undefined/[] rebinds do not look like a new value. */
export declare const EMPTY_ARRAY: never[];
/** Lit `hasChanged` for array props: same ref or both empty → no update. */
export declare function arrayPropHasChanged(value: unknown, old: unknown): boolean;
/** Coerce null/undefined/empty to the shared empty sentinel. */
export declare function coerceArray<T>(value: T[] | null | undefined): T[];