/**
 * Virtual File System
 *
 * In-memory file state with snapshot/restore for speculative fix application.
 */
export declare class VirtualFS {
    private files;
    private original;
    /**
     * Initialize VFS from a tsconfig.json path
     */
    static fromProject(configPath: string): VirtualFS;
    /**
     * Read a file. Returns undefined if not in VFS, falls back to disk.
     */
    read(fileName: string): string | undefined;
    /**
     * Write content to a file in the VFS
     */
    write(fileName: string, content: string): void;
    /**
     * Apply a text change to a file
     */
    applyChange(fileName: string, start: number, end: number, newText: string): void;
    /**
     * Get all file names in the VFS
     */
    getFileNames(): string[];
    /**
     * Check if a file exists in the VFS or on disk
     */
    fileExists(fileName: string): boolean;
    /**
     * Create a snapshot of the current state
     */
    snapshot(): Map<string, string>;
    /**
     * Restore from a snapshot
     */
    restore(snapshot: Map<string, string>): void;
    /**
     * Reset to original state (when VFS was created)
     */
    reset(): void;
    /**
     * Get the current content of a file
     */
    getContent(fileName: string): string | undefined;
}
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