/**
 * Linear Status Sync
 *
 * Syncs loop execution status to a Linear issue in real-time.
 * Updates issue state at key transitions: start → In Progress, complete → Done, failed → In Review.
 */
export type LinearSyncConfig = {
    /** Linear issue identifier (e.g., "ENG-42") or UUID */
    issueId: string;
    /** Suppress console output */
    headless?: boolean;
};
export type LinearSyncEvent = {
    type: 'start';
} | {
    type: 'iteration';
    iteration: number;
    totalIterations: number;
    success: boolean;
} | {
    type: 'complete';
    summary: string;
    commits: number;
    iterations: number;
    cost?: string;
} | {
    type: 'failed';
    error: string;
    iterations: number;
};
/**
 * Creates a Linear sync handler that updates issue status at key loop transitions.
 *
 * Returns null if auth is missing or the issue can't be found (non-blocking).
 */
export declare function createLinearSync(config: LinearSyncConfig): Promise<((event: LinearSyncEvent) => Promise<void>) | null>;
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