/**
 * Shared media formatting helpers for OpenAI adapters.
 *
 * @internal
 */
import type { ImageBlock } from '../../types/media.js';
/**
 * Logs a warning for each key in `params` that is managed by the provider and
 * would be overwritten at request time. Fires at config time so callers notice
 * before sending a request.
 */
export declare function warnManagedParams(params: Record<string, unknown> | undefined, managed: ReadonlySet<string>): void;
/**
 * Builds a `data:<mime>;base64,<payload>` URL for an image block.
 * Returns `undefined` for unsupported source types.
 */
export declare function formatImageDataUrl(imageBlock: ImageBlock): string | undefined;
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