import type { ClassifiedError } from './providerFailoverTypes.ts';
/**
 * Thrown when every provider in the chain has been exhausted.
 * Carries the category of the most recent failure so callers can
 * decide whether to escalate or provide a fallback experience.
 */
export declare class AllProvidersFailedError extends Error {
    readonly category: string;
    constructor(errors: string[], category?: string);
}
/**
 * Classify an error into a structured category with retry/cooldown semantics.
 * Checks typed error classes first (AuthError, RateLimitedError, etc.),
 * then falls back to HTTP status codes embedded in error messages,
 * then returns 'unknown' as the default.
 */
export declare function classifyError(err: unknown): ClassifiedError;
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