export interface DshUserMessage {
  content: { type: 'text'; text: string }[];
  source: { kind: 'user' };
}

export function userMessage(text: string): DshUserMessage;
export function stripRe(subject: string): string;
export function replySubject(subject: string, fallback?: string): string;
export function lastAssistantText(events: readonly any[]): string;
export function modelTitle(events: readonly any[]): string;