export type SyncPhase = 'SPAWN_ATTEMPT' | 'START' | 'SKIP_INPROGRESS' | 'FINISH' | 'ERROR';
export declare class SyncLogEvent {
    phase: SyncPhase;
    pid: number;
    branchArg: string;
    detail: string;
    constructor(phase: SyncPhase, pid: number, branchArg: string, detail: string);
}
/**
 * Append one tab-separated line per refresher event to
 * `.webpieces/logs/async-refresh/<writer>.log` (see LogStream for the writer key). `root` is
 * the workspace root holding `.webpieces`. Swallows all errors — logging must never block or fail
 * the refresher (or the hook that spawns it).
 */
export declare function logSyncEvent(root: string, event: SyncLogEvent): void;
export declare function refresherChildStdioPath(root: string): string;