/**
 * Presentation-safe error copy. Transport diagnostics stay on `raw` / structured
 * envelopes; this module only decides what a user may see.
 */
export declare const MAX_USER_FACING_ERROR_LENGTH = 500;
export declare const MAX_ERROR_TOAST_LENGTH = 500;
export declare const AUTH_CONNECTIVITY_MESSAGE = "Unable to reach the authentication service. Check your connection.";
export declare const AUTH_UPSTREAM_UNAVAILABLE_MESSAGE = "Authentication service is temporarily unavailable. Try again shortly.";
export declare const AUTH_REQUEST_FAILED_MESSAGE = "Authentication request failed. Please try again.";
export declare const AUTH_RATE_LIMITED_MESSAGE = "Too many attempts. Try again later";
export declare const AUTH_TOAST_FALLBACK_MESSAGE = "Something went wrong. Please try again.";
export declare const AUTH_CONTAINED_ERROR_FALLBACK_MESSAGE = "Something went wrong while rendering this auth panel.";
export interface ErrorPresentationOptions {
    fallback: string;
    maxLength?: number;
}
export interface UpstreamAuthFailureLike {
    error?: string | null;
    errorDetails?: {
        code?: string | null;
        message?: string | null;
        status?: number;
    } | null;
    ok?: boolean;
    raw?: unknown;
    status?: number;
}
export declare function looksLikeMarkup(value: string): boolean;
export declare function looksLikeStackTrace(value: string): boolean;
export declare function looksLikeSerializedDocument(value: string): boolean;
export declare function isUnsafeUserFacingMessage(value: string): boolean;
export declare function looksLikeRuntimeException(value: string): boolean;
/**
 * Developer diagnostic label. Never use as the primary user-facing description.
 */
export declare function getTechnicalErrorMessage(error: unknown): string | null;
export declare function toSafeUserFacingMessage(input: unknown, options: ErrorPresentationOptions): string;
/**
 * Rewrite an Athena auth result so presentation fields are safe while `raw`
 * keeps the original upstream body for diagnostics.
 */
export declare function normalizeUpstreamAuthFailure(result: UpstreamAuthFailureLike): UpstreamAuthFailureLike;