import { DropzoneOptions, DropzoneState } from './file-dropzone.types';
/**
 * Headless file dropzone. Wires a hidden file input to a clickable / drag-drop
 * zone, validates files (size, accepted types, count, optional custom rule),
 * keeps the accepted set and optionally renders a previews list. Reflects drag
 * state via `data-state="dragging"`; no visual styling in JS.
 *
 * Markup:
 * ```html
 * <div data-c42-dropzone>
 *   <input data-c42-dropzone-input type="file" hidden />
 *   <div data-c42-dropzone-zone>Drop files or click</div>
 *   <ul data-c42-dropzone-list></ul>
 * </div>
 * ```
 */
export declare class FileDropzone {
    private readonly root;
    private readonly input;
    private readonly zone;
    private readonly list;
    private readonly errorEl;
    private readonly multiple;
    private readonly maxFiles;
    private readonly maxSize;
    private readonly acceptExt;
    private readonly acceptMime;
    private readonly validateFn?;
    private readonly previews;
    private disabled;
    private accepted;
    private errorTimer;
    private cleanups;
    constructor(root: HTMLElement, options?: DropzoneOptions);
    private init;
    private onInputChange;
    private onDragOver;
    private onDragLeave;
    private onDrop;
    private onListClick;
    private reject;
    private getErrorMessage;
    private setError;
    clearError(): void;
    private matchesAccept;
    /** Returns true if the file passes every rule; otherwise emits reject. */
    private validate;
    private render;
    /** Validate and add files to the accepted set, emitting change/reject. */
    addFiles(files: FileList | File[]): void;
    removeAt(index: number): void;
    /** Remove a file by reference. */
    removeFile(file: File): void;
    clear(): void;
    openDialog(): void;
    setDisabled(disabled: boolean): void;
    private emitChange;
    get files(): File[];
    getState(): DropzoneState;
    on<E extends Event = Event>(event: string, handler: (event: E) => void): () => void;
    destroy(): void;
    private formatSize;
}