import { type ItemEqualityComparer } from '../internals/itemEquality';
/**
 * The selection helpers shared by every component that can select either one
 * value or several (`Select`, `Combobox`). In multiple mode the selection is an
 * array and membership is what counts; in single mode it is the value itself.
 *
 * Every comparison goes through an `ItemEqualityComparer`, defaulting to
 * `Object.is` — pass the component's `isItemEqualToValue` to select by object
 * values rather than by reference.
 */
/**
 * Whether `value` is selected, given the current selection.
 */
export declare function isValueSelected(selectedValue: unknown, value: unknown, multiple: boolean, comparer?: ItemEqualityComparer): boolean;
/**
 * The selection after `value` is pressed: a replacement normally, a toggle in
 * multiple mode.
 */
export declare function toggleSelectedValue(selectedValue: unknown, value: unknown, multiple: boolean, comparer?: ItemEqualityComparer): unknown;
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