/**
 * TypeScript Integration
 *
 * Wraps TypeScript's Language Service for diagnostic collection and code fix retrieval.
 */
import ts from "typescript";
import { VirtualFS } from "./vfs.js";
import type { DiagnosticRef, FileChange } from "../output/types.js";
export interface TypeScriptHost {
    /** Get all diagnostics from the project */
    getDiagnostics(): ts.Diagnostic[];
    /** Get code fixes for a specific diagnostic */
    getCodeFixes(diagnostic: ts.Diagnostic): readonly ts.CodeFixAction[];
    /** Apply a code fix to the VFS */
    applyFix(fix: ts.CodeFixAction): void;
    /** Get the VFS for snapshot/restore */
    getVFS(): VirtualFS;
    /** Get compiler options */
    getOptions(): ts.CompilerOptions;
    /** Get file names */
    getFileNames(): string[];
    /**
     * Notify the host that files have changed externally (e.g., after VFS restore).
     * This bumps all file versions so the LanguageService re-checks everything.
     */
    notifyFilesChanged(): void;
    /**
     * Reset the host to its initial state (VFS reset + version bump).
     * Useful for test isolation when reusing hosts.
     */
    reset(): void;
}
/**
 * Create a TypeScript host from a project config.
 *
 * Performance optimization: The language service is created once and reused.
 * File versions are tracked per-file and incremented when the VFS changes,
 * allowing TypeScript's incremental checker to recompute only what's needed.
 */
export declare function createTypeScriptHost(configPath: string): TypeScriptHost;
/**
 * Convert a TypeScript diagnostic to our DiagnosticRef format
 */
export declare function toDiagnosticRef(diagnostic: ts.Diagnostic): DiagnosticRef;
/**
 * Convert a CodeFixAction's changes to our FileChange format
 */
export declare function toFileChanges(fix: ts.CodeFixAction): FileChange[];
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