import type { Handler } from "../types";
export interface HppOptions {
    /**
     * Parameters that are allowed to have multiple values (arrays).
     * All other duplicated parameters will be reduced to their last value.
     * Default: [] (no whitelist — all duplicates reduced)
     */
    whitelist?: string[];
    /**
     * If true, store the original polluted query values in req.locals.queryPolluted.
     * Default: true
     */
    checkQuery?: boolean;
    /**
     * If true, also sanitize req.body (for urlencoded bodies with duplicate keys).
     * Default: true
     */
    checkBody?: boolean;
}
export declare function hpp(options?: HppOptions): Handler;
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