import type { ContentItem } from '../types/index.js';
/**
 * Formats text content with T: prefix for printing
 *
 * Automatically converts UTF-8 text to GBK Base64 encoding as required by the API.
 *
 * @param text - Text content to print
 * @returns Formatted print content (T:base64...)
 *
 * @example
 * ```typescript
 * const formatted = formatTextContent('Hello World');
 * // Returns: 'T:SGVsbG8gV29ybGQ='
 * ```
 */
export declare function formatTextContent(text: string): string;
/**
 * Formats image content with P: prefix for printing
 *
 * @param base64Image - Monochrome bitmap Base64 image (should be pre-converted)
 * @returns Formatted print content (P:base64...)
 *
 * @example
 * ```typescript
 * const formatted = formatImageContent(monochromeBase64);
 * // Returns: 'P:Qk0OAgAAAAAAAD4A...'
 * ```
 */
export declare function formatImageContent(base64Image: string): string;
/**
 * Formats mixed content (text and images) for printing
 *
 * Combines multiple text and image items with pipe (|) separator.
 *
 * @param items - Array of content items with type and content
 * @returns Formatted print content with T: and P: prefixes
 *
 * @example
 * ```typescript
 * const formatted = formatMixedContent([
 *   { type: 'text', content: 'Hello' },
 *   { type: 'image', content: 'base64imagedata' },
 *   { type: 'text', content: 'World' }
 * ]);
 * // Returns: 'T:SGVsbG8=|P:base64imagedata|T:V29ybGQ='
 * ```
 */
export declare function formatMixedContent(items: ContentItem[]): string;
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