/**
 * File writing utilities for lumen.
 * Lifted from @the-forge-flow/visual-explainer-pi: src/utils/file-writer.ts.
 */
import type { ExtensionState } from "../types.js";
export declare function ensureOutputDir(): Promise<string>;
export declare function writeHtmlFile(filename: string, html: string, state: ExtensionState): Promise<string>;
export declare function createInitialState(): ExtensionState;
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