export type StartupStatus = "warming" | "installing" | "upgrading";
export type StartupWorkStatus = Exclude<StartupStatus, "warming">;
/**
 * What a warm-pool pod is doing before its dev server takes over, reported
 * on the warm-standby `/_sb_health` so the editor can say why it is waiting.
 *
 * The CLI creates the instance and hands it to `dev()`: the packaged CLI can
 * load two copies of the SDK, so a module-level singleton would split the
 * writer from the reader.
 */
export declare class StartupPhase {
    private readonly inFlight;
    get status(): StartupStatus;
    /**
     * Reports `status` until `work` settles. The most recently started work
     * that is still running wins, so overlapping work never reports a phase
     * that has already finished.
     */
    track(status: StartupWorkStatus, work: Promise<unknown>): void;
}
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