import type { AdaptiveCard } from './models.js';
/**
 * Serialize an {@link AdaptiveCard} to a JSON string.
 *
 * `undefined` values are automatically omitted by `JSON.stringify`.
 * Enum values are already the correct camelCase strings, so no custom
 * converter is needed — it just works.
 */
export declare function toJson(card: AdaptiveCard, indent?: number): string;
/**
 * Return a clean plain object for an {@link AdaptiveCard}, with all
 * `undefined` properties stripped.
 *
 * Use this instead of {@link toJson} when you need a native object — for
 * example, to embed a card inside a larger API payload without double-
 * serializing.
 */
export declare function toObject(card: AdaptiveCard): AdaptiveCard;
/**
 * Deserialize a JSON string to an {@link AdaptiveCard}.
 *
 * Because the Adaptive Card schema embeds a `type` discriminant on every
 * element, the parsed object already carries the right shape.  TypeScript's
 * structural typing lets callers narrow with `element.type === 'TextBlock'`
 * etc. without needing class instances.
 *
 * Returns `null` when the input is empty or not a valid JSON object.
 */
export declare function fromJson(json: string): AdaptiveCard | null;
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