/**
 * Virtual filesystem layout for DTS resolution. Each entry lives under
 * `file:///node_modules/__tsepoch_N/<pkg>/...`. The CLI's emit step strips
 * the epoch and writes real files; the web client's TypeChecker treats
 * these paths as virtual.
 *
 * Epoch is bumpable so reactive consumers (web client) can invalidate the
 * world when package ranges change. CLI never bumps within a single emit.
 */
export declare class VirtualFs {
    private epoch;
    bumpEpoch(): void;
    epochDir(): string;
    pathForMain(pkg: string): string;
    pathFor(pkg: string, rel: string): string;
}
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