export interface SimpleWrapper {
    key: string;
    count: number;
}
export declare class KeyValueCounter {
    private readonly data;
    private results;
    private processed;
    add(item: string): void;
    addAll(items: readonly string[]): void;
    getAll(): readonly SimpleWrapper[];
    getTopN(count: number): readonly SimpleWrapper[];
    get length(): number;
    /**
     * @deprecated use {@link length} instead
     */
    getCount(): number;
    private process;
}
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