/**
 * Startup Progress
 *
 * The three-step checklist shown while the CLI comes up. Steps advance when
 * the work they name actually finishes. The module owns the spinner cadence
 * but never the pace. Nothing here sleeps, so startup costs what the work
 * costs.
 *
 * The clock and the terminal are injected, so the frame sequence is reachable
 * from a test without a real terminal or a real wait.
 */
/** How often the active step's spinner advances. */
export declare const SPINNER_INTERVAL_MS = 60;
export interface StartupProgress {
    /** Mark the step at `index` active, everything before it is done. */
    begin(index: number): void;
    /** Mark every step done, paint a final time, and stop animating. */
    finish(): void;
    /**
     * Stop animating without claiming success, leaving the failed step visible
     * as the last one that was active. Use when startup threw.
     */
    stop(): void;
}
/** The terminal and the clock, injected so tests can supply their own. */
export interface StartupProgressDeps {
    write: (text: string) => void;
    setInterval: (fn: () => void, ms: number) => number;
    clearInterval: (handle: number) => void;
}
/**
 * Begin painting the startup checklist. Returns a handle the caller advances
 * as each piece of real work completes.
 *
 * Stays in the alternate screen on `finish()` so the dashboard can take over
 * in place.
 */
export declare function startStartupProgress(stepLabels: string[], deps?: StartupProgressDeps): StartupProgress;
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