/**
 * Content Item Fixture Generator
 *
 * Provides type-safe helpers for creating ContentItem objects in tests.
 */
import type { ContentItem } from '@wavespec/types';
/**
 * Content type discriminator
 */
export type ContentType = 'text' | 'image' | 'resource';
/**
 * Creates a ContentItem with type-specific defaults
 *
 * Generates a complete ContentItem object with sensible defaults based on the content type.
 * Override any field via the overrides parameter.
 *
 * @param type - Content type (text, image, resource)
 * @param overrides - Partial ContentItem to override defaults
 * @returns Complete ContentItem object
 *
 * @example
 * ```typescript
 * // Text content
 * const text = createContentItem('text', {
 *   text: 'Hello, world!',
 *   mimeType: 'text/plain'
 * });
 *
 * // Image content with base64 data
 * const image = createContentItem('image', {
 *   data: 'iVBORw0KGgoAAAANSUhEUgA...',
 *   mimeType: 'image/png'
 * });
 *
 * // Resource content
 * const resource = createContentItem('resource', {
 *   data: 'eyJuYW1lIjoiQWxpY2UifQ==',
 *   mimeType: 'application/json'
 * });
 * ```
 */
export declare function createContentItem(type: ContentType, overrides?: Partial<ContentItem>): ContentItem;
/**
 * Helper: Creates a text ContentItem
 *
 * @param text - Text content
 * @param mimeType - MIME type (default: "text/plain")
 * @returns Text ContentItem
 *
 * @example
 * ```typescript
 * const text = text('Hello, world!');
 * const markdown = text('# Title', 'text/markdown');
 * const json = text('{"key": "value"}', 'application/json');
 * ```
 */
export declare function text(text: string, mimeType?: string): ContentItem;
/**
 * Helper: Creates an image ContentItem
 *
 * @param data - Base64-encoded image data
 * @param mimeType - MIME type (default: "image/png")
 * @returns Image ContentItem
 *
 * @example
 * ```typescript
 * const png = image('iVBORw0KGgoAAAANSUhEUgA...');
 * const jpg = image('data...', 'image/jpeg');
 * ```
 */
export declare function image(data: string, mimeType?: string): ContentItem;
/**
 * Helper: Creates a resource ContentItem
 *
 * @param data - Base64-encoded resource data
 * @param mimeType - MIME type (default: "application/octet-stream")
 * @returns Resource ContentItem
 *
 * @example
 * ```typescript
 * const binary = resource('SGVsbG8gV29ybGQh'); // "Hello World!" in base64
 * const json = resource('eyJrZXkiOiJ2YWx1ZSJ9', 'application/json');
 * ```
 */
export declare function resource(data: string, mimeType?: string): ContentItem;
/**
 * Helper: Creates a JSON text ContentItem from an object
 *
 * @param obj - Object to serialize as JSON
 * @returns Text ContentItem with JSON MIME type
 *
 * @example
 * ```typescript
 * const jsonContent = json({ name: 'Alice', age: 30 });
 * // Returns: { type: 'text', text: '{"name":"Alice","age":30}', mimeType: 'application/json' }
 * ```
 */
export declare function json(obj: unknown): ContentItem;
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