import { type BrowserKey, type HelperTimeoutState } from '../browser/launch';
import type { WorldSnapshot } from './snapshotTypes';
export declare function composeInspectTimeoutDiagnosis(state: HelperTimeoutState, errors: string[], engineCoreInstalled?: boolean): string;
export type SnapshotWorldOptions = {
    directory: string;
    timeoutMs?: number | undefined;
    /** Frames/assets settle time between helper-ready and the snapshot — determinism lever. */
    settleMs?: number | undefined;
    maxObjects?: number | undefined;
    /** Diagnostic override: launch only this candidate, no fallback (default: try the whole chain). */
    browser?: BrowserKey | undefined;
    /** URL-prefix → dir fallbacks (e.g. a shared character-asset tree at /assets, /basis). */
    fallbackMounts?: Record<string, string> | undefined;
    onProgress?: ((message: string) => void) | undefined;
};
export declare function snapshotWorld(opts: SnapshotWorldOptions): Promise<WorldSnapshot>;