export type ErrorCode = 'VALIDATION_ERROR' | 'NOT_FOUND' | 'API_KEY_ERROR' | 'RATE_LIMIT' | 'UPSTREAM_TIMEOUT' | 'INTERNAL_ERROR';
export interface CoreErrorShape {
    code: ErrorCode;
    message: string;
    hint?: string;
    details?: unknown;
    retryable: boolean;
}
export declare class CoreError extends Error {
    readonly code: ErrorCode;
    readonly hint?: string;
    readonly details?: unknown;
    readonly retryable: boolean;
    constructor(shape: CoreErrorShape);
    toJSON(): CoreErrorShape;
}
export declare function apiKeyError(region: string, rawMessage?: string): CoreError;
export declare function apiKeyExpiredError(region: string): CoreError;
export declare function rateLimitError(region: string): CoreError;
export declare function toCoreError(error: unknown): CoreError;
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