/**
 * Shared HTTP error handling for model adapters.
 *
 * Converts HTTP error responses into structured ONI errors:
 * - 429 → ModelRateLimitError (with retry-after header parsing)
 * - 4xx → ModelAPIError (not recoverable)
 * - 5xx → ModelAPIError (recoverable)
 */
/**
 * Parse retry-after from response headers.
 * Supports:
 * - `retry-after` (seconds, per HTTP spec)
 * - `retry-after-ms` (milliseconds, used by some providers)
 */
export declare const MAX_RETRY_AFTER_MS: number;
/**
 * Throw a structured error for a non-OK HTTP response.
 * Call this after `const text = await res.text()` on a failed response.
 */
export declare function throwModelHttpError(provider: string, status: number, body: string, headers?: {
    get(name: string): string | null;
} | null): never;
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