/**
 * Options that customize how streaming message content is sanitized.
 */
type SanitizeStreamingMessageContentOptions = {
    /**
     * Whether the chat message has finished streaming.
     */
    isComplete?: boolean;
};
/**
 * Type describing fence delimiter.
 */
type FenceDelimiter = '```' | '~~~';
/**
 * Type describing code fence streaming boundary.
 */
type CodeFenceStreamingBoundary = {
    readonly kind: 'codeFence';
    readonly index: number;
    readonly delimiter: FenceDelimiter;
};
/**
 * Type describing math streaming boundary.
 */
type MathStreamingBoundary = {
    readonly kind: 'math';
    readonly index: number;
};
/**
 * Type describing image prompt streaming boundary.
 */
type ImagePromptStreamingBoundary = {
    readonly kind: 'imagePrompt';
    readonly index: number;
};
/**
 * Metadata describing the most-recently introduced rich feature that is still streaming.
 *
 * @private internal helper of <ChatMessageItem/>
 */
export type StreamingFeatureBoundary = CodeFenceStreamingBoundary | MathStreamingBoundary | ImagePromptStreamingBoundary;
/**
 * Examines the latest streaming feature boundary so rich placeholders can be rendered while content is still being produced.
 *
 * @param content - Message text that may still be streaming.
 * @returns Metadata describing the richest streaming feature or `null` when nothing is being hidden.
 *
 * @private internal helper of <ChatMessageItem/>
 */
export declare function getLatestStreamingFeatureBoundary(content: string): StreamingFeatureBoundary | null;
/**
 * Trims trailing rich-feature markup from streaming messages so users do not see the raw source while the feature loads.
 *
 * @param content - Full markdown text produced by the assistant.
 * @param options - Sanitization options (streaming state).
 * @returns Text that is safe to render during streaming.
 *
 * @private internal helper of <ChatMessageItem/>
 */
export declare function sanitizeStreamingMessageContent(content: string, options?: SanitizeStreamingMessageContentOptions): string;
export {};