export interface Stat {
    elapsedTime: number;
    heapUsedChange: number;
    heapUsedTotal: number;
}
/**
 * Timer to track certain operations' performance. Used by Astro's scripts only.
 * Set `process.env.ASTRO_TIMER_PATH` truthy to enable.
 */
export declare class AstroTimer {
    private enabled;
    private ongoingTimers;
    private stats;
    constructor();
    /**
     * Start a timer for a scope with a given name.
     */
    start(name: string): void;
    /**
     * End a timer for a scope with a given name.
     */
    end(name: string): void;
    /**
     * Write stats to `process.env.ASTRO_TIMER_PATH`
     */
    writeStats(): void;
}