/**
 * Internal image processing utilities
 *
 * Detects Uint8Array/Buffer values in template interpolations,
 * determines their MIME type via file-type, and converts them
 * to base64 data URLs for the OpenAI image_url content part format.
 */
export declare const IMAGE_MARKER: unique symbol;
export type ImageMarker = {
    [IMAGE_MARKER]: true;
    url: string;
};
export declare function isImageMarker(value: unknown): value is ImageMarker;
/**
 * Scan template values for Uint8Array instances and replace them with ImageMarkers.
 * Returns the original array unchanged if no images are found.
 */
export declare function processImageValues(values: unknown[]): Promise<unknown[]>;
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