interface Vfs {
    create(...args: unknown[]): unknown;
}
/** The number at the end of a mount point, or undefined for one that has none. */
export declare function mountNumber(root: string): number | undefined;
/**
 * Mount what `make()` creates — with `at`, at that mount point, which must
 * not be behind this thread's count; otherwise this throws, and nothing stays
 * mounted. `make()` may be called twice: the first, when it lands short of
 * `at`, is unmounted again.
 */
export declare function mountAt(VFS: Vfs, make: () => {
    mount(): string;
    unmount(): void;
}, at?: string | undefined): string;
export {};
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