import { type BoardItem, type BoardMove } from "./board.types.js";
/** A drop as the DnD layer reports it: target index EXCLUDES the dragged item. */
export interface BoardDrop {
    /** The dragged item's id. */
    id: string;
    /** The source column id. */
    from: string;
    /** The target column id. */
    to: string;
    /** Insertion index within the target column, dragged item excluded, 0..count. */
    index: number;
}
/**
 * Compute the BoardMove for a drop against the CURRENT controlled `items` order. The target
 * column's order is the array order filtered by `columnId`, with the dragged item excluded
 * (it is being lifted out), so `afterId` is the item that ends up directly above the drop and
 * `beforeId` the one directly below; null marks the top/bottom of the column. Returns null when
 * the dragged id is not in `items` (a defensive no-op; the drop is stale).
 */
export declare function boardMoveFor(items: readonly BoardItem[], drop: BoardDrop): BoardMove | null;
/**
 * Apply a BoardMove to a controlled `items` array, returning a NEW array (input untouched)
 * where the moved item carries the target `columnId` and sits at `move.index` within that
 * column. Items in other columns keep their relative order. This is the standard `onMove`
 * reducer for consumers that keep the list in local state, and the Board's own reducer in
 * uncontrolled (`defaultItems`) mode. Unknown ids return the input array unchanged. Generic
 * so a consumer's richer item type survives the reducer (the docs `applyDrop` precedent).
 */
export declare function applyBoardMove<T extends BoardItem>(items: readonly T[], move: BoardMove): T[];
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