import { EventEmitter } from 'events';
import { WorkspaceFolder } from 'vscode-languageserver-protocol';
import { URI } from 'vscode-uri';
import { DirectoryWalker } from './dir';
export type WorkspaceFileUpdate = {
    fileUri: URI;
    event: 'add' | 'change' | 'unlink';
    workspaceFolder: WorkspaceFolder;
};
export type WorkspaceFilesUpdate = {
    files: URI[];
    workspaceFolder: WorkspaceFolder;
};
export declare enum VirtualFileSystemEvents {
    WorkspaceFileEvent = "workspaceFileEvent",
    WorkspaceFilesEvent = "workspaceFilesEvent"
}
export interface FileSystemEventMap {
    [VirtualFileSystemEvents.WorkspaceFileEvent]: WorkspaceFileUpdate;
    [VirtualFileSystemEvents.WorkspaceFilesEvent]: WorkspaceFilesUpdate;
}
export interface FileSystemEventListener {
    <T extends VirtualFileSystemEvents>(eventType: T, data: FileSystemEventMap[T]): void;
}
export interface VirtualFileSystemService extends DefaultVirtualFileSystemService {
}
export declare const VirtualFileSystemService: import("@gitlab-org/di").InterfaceId<VirtualFileSystemService>;
export declare class DefaultVirtualFileSystemService {
    #private;
    constructor(directoryWalker: DirectoryWalker);
    /**
     * Emits a workspace files update event for the given workspace folder.
     * This is used to notify consumers of the virtual file system that the files in the workspace have changed.
     */
    emitFilesForWorkspace(workspaceFolder: WorkspaceFolder): Promise<void>;
    /**
     * Adds a listener for the file system event.
     * This can be of type `WorkspaceFileUpdate` or `WorkspaceFilesUpdate`.
     *
     * @param listener - The listener to add.
     * @returns A disposable object that can be used to remove the listener.
     */
    onFileSystemEvent(listener: FileSystemEventListener): {
        dispose: () => EventEmitter;
    };
}