export declare const FILESYSTEM_WRITE_TOKEN: unique symbol;
/** Filesystem capability provider interface */
export interface FilesystemProvider {
    readonly name: string;
    readonly version: string;
    readonly root: string;
    readFile(path: string): Promise<string | undefined>;
    writeFile(path: string, content: string): Promise<void>;
    listDirectory(path: string): Promise<string[]>;
    pathExists(path: string): Promise<boolean>;
    isDirectory(path: string): Promise<boolean>;
    ensureDirectory(path: string): Promise<void>;
    deleteFile(path: string): Promise<void>;
}
/** POSIX filesystem provider using Node.js fs/promises */
export declare class PosixFilesystemProvider implements FilesystemProvider {
    readonly name = "posix-filesystem";
    readonly version = "1.0.0";
    readonly root: string;
    private writeToken;
    constructor(root: string, writeToken?: symbol);
    private resolve;
    private ensureAuthorized;
    readFile(path: string): Promise<string | undefined>;
    writeFile(path: string, content: string): Promise<void>;
    listDirectory(path: string): Promise<string[]>;
    pathExists(path: string): Promise<boolean>;
    isDirectory(path: string): Promise<boolean>;
    ensureDirectory(path: string): Promise<void>;
    deleteFile(path: string): Promise<void>;
}
/** In-memory filesystem provider for testing */
export declare class InMemoryFilesystemProvider implements FilesystemProvider {
    readonly name = "in-memory-filesystem";
    readonly version = "1.0.0";
    readonly root = "/";
    private files;
    private directories;
    private writeToken;
    constructor(initialFiles?: Record<string, string>, writeToken?: symbol);
    private normalize;
    private ensureAuthorized;
    readFile(path: string): Promise<string | undefined>;
    writeFile(path: string, content: string): Promise<void>;
    listDirectory(path: string): Promise<string[]>;
    pathExists(path: string): Promise<boolean>;
    isDirectory(path: string): Promise<boolean>;
    ensureDirectory(path: string): Promise<void>;
    deleteFile(path: string): Promise<void>;
}
export declare function createPosixFilesystemProvider(root: string, writeToken?: symbol): FilesystemProvider;
export declare function createInMemoryFilesystemProvider(initialFiles?: Record<string, string>, writeToken?: symbol): FilesystemProvider;