/**
 * Provider HTTP error formatting helpers.
 *
 * Ported from openclaw/src/agents/provider-http-errors.ts (commit baseline 2026-05-08).
 *
 * DECISION (per docs/voice-rearchitecture.md §6):
 *  - Body read is hard-capped at 16 KiB to avoid memory blowups on misbehaving
 *    providers that return huge HTML 5xx pages.
 *  - Both `error.message` (OpenAI shape) and `error.detail` (DashScope shape) are
 *    normalized into a single human-readable string for logs.
 *  - Request id is taken from `x-request-id` first, then `request-id` (Alibaba uses
 *    the latter on some endpoints).
 */
export declare function truncateErrorDetail(detail: string, limit?: number): string;
export declare function readResponseTextLimited(response: Response, limitBytes?: number): Promise<string>;
/** Best-effort vendor `code` + human message from a JSON error body (image providers, failover). */
export declare function extractVendorErrorFields(body: string): {
    code?: string;
    message?: string;
};
export declare function formatProviderErrorPayload(payload: unknown): string | undefined;
export declare function extractProviderErrorDetail(response: Response): Promise<string | undefined>;
export declare function extractProviderRequestId(response: Response): string | undefined;
export interface ProviderHttpErrorParts {
    label: string;
    status: number;
    detail?: string;
    requestId?: string;
    /** Prefix in front of the status code, e.g. "HTTP " for non-provider transports. */
    statusPrefix?: string;
    /** Vendor error code when JSON body could be parsed (OpenAI, DashScope, MiniMax, …). */
    code?: string;
    /** Request URL for diagnostics (image-generation assertOk path). */
    url?: string;
    /** Raw body preview for non-JSON failures (image-generation assertOk path). */
    bodyPreview?: string;
    /**
     * When set, used as {@link Error.message} verbatim instead of
     * {@link formatProviderHttpErrorMessage}.
     */
    messageOverride?: string;
}
export declare function formatProviderHttpErrorMessage(parts: ProviderHttpErrorParts): string;
/**
 * ProviderHttpError carries the parsed status / detail / requestId so callers
 * (e.g. STT runner, TTS fallback chain) can classify failures without re-parsing.
 */
export declare class ProviderHttpError extends Error {
    readonly status: number;
    readonly detail?: string;
    readonly requestId?: string;
    readonly label: string;
    readonly code?: string;
    readonly url?: string;
    readonly bodyPreview?: string;
    constructor(parts: ProviderHttpErrorParts);
}
export declare function createProviderHttpError(response: Response, label: string, options?: {
    statusPrefix?: string;
}): Promise<ProviderHttpError>;
export declare function assertOkOrThrowProviderError(response: Response, label: string): Promise<void>;
export declare function assertOkOrThrowHttpError(response: Response, label: string): Promise<void>;
/**
 * Throws {@link ProviderHttpError} when the response is not OK; otherwise returns
 * the response. Body is consumed on failure (do not re-read).
 *
 * Used by bundled image-generation HTTP helpers (vendor code extraction + body preview).
 */
export declare function assertOk(res: Response, contextUrl?: string): Promise<Response>;