import type { WorkerStartupMetrics } from "./types.js";
export declare function createWorkerStartupMetrics({ route, workerType, startupTime, fromMainThread, fromRscWorker, fromHtmlWorker, memoryUsage, description, }: {
    route: string;
    workerType: "rsc" | "html";
    startupTime: number;
    fromMainThread?: boolean;
    fromRscWorker?: boolean;
    fromHtmlWorker?: boolean;
    memoryUsage?: NodeJS.MemoryUsage;
    description?: string;
}): WorkerStartupMetrics;
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