export type Slot<T> = T | null;
export type SlotGrid<T> = readonly Slot<T>[];
export type SlotResult<T> = {
    status: "ok";
    grid: Slot<T>[];
} | {
    status: "rejected";
    reason: "invalid-slot" | "slot-occupied" | "empty-slot";
};
/** @internal */
export declare function createSlots<T>(size: number): Slot<T>[];
/** @internal */
export declare function normalizeSlots<T>(values: SlotGrid<T>, size: number): Slot<T>[];
/** @internal */
export declare function placeAt<T>(grid: SlotGrid<T>, index: number, value: T): SlotResult<T>;
/** @internal */
export declare function removeAt<T>(grid: SlotGrid<T>, index: number): SlotResult<T>;
/** @internal */
export declare function moveSlot<T>(grid: SlotGrid<T>, from: number, to: number): SlotResult<T>;
/** @internal */
export declare function firstEmpty<T>(grid: SlotGrid<T>): number | null;
/** @internal */
export declare function insertFirst<T>(grid: SlotGrid<T>, value: T): SlotResult<T>;
/** @internal */
export declare function compactSlots<T>(grid: SlotGrid<T>): Slot<T>[];
/** @internal */
export declare function countFilled<T>(grid: SlotGrid<T>): number;
/** @internal */
export declare function indexOfSlot<T>(grid: SlotGrid<T>, match: (value: T, index: number) => boolean): number | null;