/**
 * Markdown ↔ Rich Text conversion and Markdown mode toggle.
 *
 * markdownToHtml  — converts a markdown string to editor-compatible HTML
 * htmlToMarkdown  — converts editor HTML back to markdown
 * MarkdownFeature — manages mode toggle and .md file import
 */
export declare function markdownToHtml(markdown: string): string;
export declare function htmlToMarkdown(html: string): string;
export declare class MarkdownFeature {
    private editorArea;
    private wrapper;
    private toolbar;
    private textarea;
    private _isMarkdownMode;
    constructor(editorArea: HTMLElement, wrapper: HTMLElement, toolbar: HTMLElement);
    get isMarkdownMode(): boolean;
    /** Convert current editor content to markdown and show textarea. */
    toggle(): void;
    /** Return current content as HTML (handles markdown mode). */
    getContentHtml(): string | null;
    /** Open a file picker and import a .md file into the editor. */
    importFile(onImport: (html: string) => void): void;
    /** Export current editor content as a .md file download. */
    exportFile(html: string): void;
    destroy(): void;
    private switchToMarkdown;
    private switchToRichText;
    _pendingHtml: string | null;
    private static readonly ICON_MD;
    private static readonly ICON_RT;
    private updateToggleBtn;
}
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