import type ts from 'typescript/lib/tsserverlibrary';
import { ConfigManager } from '../config-manager';
import { Logger } from '../logger';
import { SvelteSnapshotManager } from '../svelte-snapshots';
export declare function isPatched(project: ts.server.Project): boolean;
export declare function decorateLanguageService(ls: ts.LanguageService, snapshotManager: SvelteSnapshotManager, logger: Logger, configManager: ConfigManager, info: ts.server.PluginCreateInfo, typescript: typeof ts, onDispose: () => void): ts.LanguageService;