export declare function pushLoopPhase(label: string): void;
export declare function popLoopPhase(): void;
export declare function currentLoopPhase(): string | undefined;
/**
 * Phase to blame for a just-detected loop block: the live top phase if one is
 * still held, else the most recent phase pushed since the last call. Clears the
 * recent slot so a block in a later, phase-less interval is not misattributed
 * to a phase that already finished.
 */
export declare function takeRecentLoopPhase(): string | undefined;