export declare class PerfTracker {
    private logToConsole;
    private phases;
    private t0;
    private last;
    private label;
    constructor(label: string);
    mark(phase: string): void;
    capture(): {
        total_ms: number;
        phases: Record<string, number>;
    };
    done(extra?: Record<string, unknown>): void;
}
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