import type { Middleware } from "@nifrajs/core/server";
export interface PoweredByOptions {
    /** Header name. Default `"x-powered-by"`. */
    readonly header?: string;
    /** Header value. Default `"Nifra"`. */
    readonly value?: string;
    /** Do not overwrite an existing header by default. */
    readonly respectExisting?: boolean;
}
/**
 * Opt-in `X-Powered-By` style header. Nifra does not emit this by default; use it only when you want a
 * public framework/product marker.
 */
export declare function poweredBy(options?: PoweredByOptions): Middleware;
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