import type { ComputedRef } from "vue";
export interface XyMergedStateOptions<T> {
    defaultValue?: T;
    onChange?: (value: T, previousValue: T) => void;
    value?: () => T | undefined;
}
export type XyMergedStateSetter<T> = (value: T | ((previousValue: T) => T)) => void;
export declare function useMergedState<T>(initialValue: T, options?: XyMergedStateOptions<T>): readonly [ComputedRef<T>, XyMergedStateSetter<T>];
export declare function uniqueValues<T>(values: readonly T[]): T[];
export declare function toggleValue<T>(values: readonly T[], value: T, selected?: boolean): T[];
export declare function replaceValue<T>(values: readonly T[], value: T, replacement: T): T[];