export interface OrderedItem {
    id: string;
    orderKey: string;
}
/**
 * Returns the key that moves `itemId` immediately after `afterId`. A null
 * `afterId` moves the item to the beginning. The input may be unsorted.
 */
export declare function orderKeyAfter(items: readonly OrderedItem[], itemId: string, afterId: string | null): string;
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