/**
 * Slot-indexed string store for the scatter "Label" column. Strings
 * are deduplicated across split-by facets so identical labels share a
 * dictionary entry; the per-slot `Int32Array` then holds dictionary
 * indices (`-1` means "no label for this slot").
 */
export declare class LabelInterner {
    readonly data: Int32Array;
    readonly dictionary: string[];
    private readonly dictMap;
    constructor(capacity: number);
    /**
     * Insert (or look up) `label` and write its dictionary index into
     * the slot at `flatIdx`. Returns the assigned dictionary index.
     */
    set(flatIdx: number, label: string): number;
    /**
     * Resolve a slot's label string, or `null` if unset.
     */
    get(flatIdx: number): string | null;
}