import type { FileUploadOptions } from '../types/options';
/**
 * File upload feature — inserts media previews or download links.
 */
export declare class FileFeature {
    private editorArea;
    private fileUploadUrl;
    private maxFileSize;
    constructor(editorArea: HTMLElement, opts: FileUploadOptions);
    triggerUpload(): void;
    private handleUpload;
    private insertUploadPlaceholder;
    private replacePlaceholderWithFigure;
    /**
     * Builds a <figure class="ray-file-figure"> for the given file.
     * Public so content.ts restoreFromHTML and tests can reuse it.
     *
     *  image/* → <img>
     *  video/* → <video controls>
     *  audio/* → <audio controls>
     *  other   → <a> download link with extension badge
     *
     * figcaption is always appended with the filename (editable in the editor).
     */
    buildFileFigure(name: string, mimeType: string, url: string): HTMLElement;
    /**
     * Restores editor-only attributes on .ray-file-figure elements
     * after setContent() or paste. Called from ContentManager.applyStructure().
     */
    static restoreFromHTML(container: HTMLElement): void;
    private showError;
}
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