/** Per-session cursor over the `stream_event` sequence. Cheap and self-healing: every
 *  `message_start` resets it, so a missed line can at worst drop one block's deltas. */
export interface StreamDeltaState {
    /** `message.id` of the message being streamed — the first half of every blockId. */
    messageId: string | null;
    /** Backend-reported model for the current message. */
    model: string | null;
    /** blockId of the text block currently open, awaiting its complete `assistant` event. */
    textBlockId: string | null;
}
export declare function createStreamDeltaState(): StreamDeltaState;
/** Translate a partial stdout event into one text delta while advancing the message cursor. */
export declare function parseStreamEvent(data: any, state: StreamDeltaState): {
    text: string;
    blockId: string;
} | null;
/**
 * Consume the blockId of the streamed text block that the complete `assistant` event now being
 * handled belongs to. Returns null when nothing streamed (kill switch, older CLI, thinking-only
 * message) — the finalizing path then behaves exactly as before, without a blockId.
 *
 * Consumed once: a block's id is handed out to exactly one complete message, so a later event
 * can never re-adopt a stale id.
 */
export declare function takeTextBlockId(state: StreamDeltaState): string | null;
export declare function extractAskUserQuestions(data: any, sessionId: string): Array<{
    toolUseId: string | null;
    questions: any[];
    sessionId: string;
}>;
export declare function formatAssistantEvent(data: any): string | null;
export declare function formatUserEvent(data: any): string | null;
export declare function formatResultEvent(data: any): string;
export declare function formatEvent(data: any): string | null;
export declare function buildPrompt(userMessage: string, files: any[]): string;
/** Merge a brief epilogue with a substantially longer earlier message (e.g. an orient briefing) so Slack gets the real content.
 *  Triggers only when final is both absolutely short (<300) AND relatively short (<50% of longest). */
export declare function mergeSubstantialOutput(finalOutput: string | null, longestOutput: string | null): string | null;
export type ExtractResultOutcome = {
    resolved: true;
    value: any;
    error?: undefined;
} | {
    resolved: false;
    error: Error;
    value?: undefined;
};
export declare function extractResult(resultData: any, effectiveSessionId: string, killed: boolean, code: number, stderr: string, planFilePath: string | null, enteredPlanMode: boolean, exitedPlanMode: boolean, askUserQuestions: any[], finalOutput: string | null, longestOutput: string | null): ExtractResultOutcome;
export declare const PLAN_DIRS: string[];
export declare function isPlanFilePath(filePath: unknown): boolean;
export declare function setActivePlanFile(sessionId: string, path: string): void;
export declare function clearActivePlanFile(sessionId: string): void;
export declare function getCurrentPlanFilePath(sessionId: string): string | null;