/** Status used when a code carries no mapping. */
export declare const UNMAPPED_HTTP_STATUS = 500;
export interface HttpStatusResolution {
    /** The status a transport should send. */
    status: number;
    /**
     * Whether `status` came from the registry. `false` means the code is not
     * registered and `status` is the {@link UNMAPPED_HTTP_STATUS} fallback — the
     * one case where a 500 does not mean "the server broke".
     */
    mapped: boolean;
}
/** Notified once per unmapped code. */
export type UnmappedStatusReporter = (code: string) => void;
/**
 * Replace the unmapped-code reporter (pass `null` to restore the default, or a
 * no-op to silence it). Transports with a real logger should route it there.
 */
export declare function setUnmappedStatusReporter(next: UnmappedStatusReporter | null): void;
/** Test seam: forget which codes have already been reported. */
export declare function resetUnmappedStatusReports(): void;
/**
 * Resolve the HTTP status for an error code.
 *
 * An unregistered code is reported (once per code) rather than silently
 * degrading to 500: a refusal that is plainly a 403 or 409 turning into a 500
 * looks like a crash, and the only way anyone notices is by reading the
 * transport's source.
 */
export declare function httpStatusFor(code: string | null | undefined): HttpStatusResolution;