import { EventEmitter } from '../../stencil-public-runtime';
import { DropzoneSize } from '../../utils/constants';
/**
 * @slot icon - Replaces the built-in illustration (`md`) or icon (`sm`).
 */
export declare class NvDropzone {
    private readonly uid;
    private readonly inputId;
    private readonly instructionId;
    private readonly helperId;
    private inputElement?;
    /** Nested elements fire their own enter / leave; count them to avoid flicker. */
    private dragDepth;
    /****************************************************************************/
    /**
     * Density of the dropzone. `md` shows an illustration and suits primary
     * upload steps; `sm` shows a small icon and suits dense layouts.
     */
    readonly size: `${DropzoneSize}`;
    /**
     * File types offered by the file picker, as a comma-separated list of MIME
     * types or extensions, for example "application/pdf,.jpg". It only filters
     * the picker: dropped and pasted files are emitted unfiltered.
     */
    readonly accept?: string;
    /**
     * Lets the user select, drop or paste several files at once. When it is
     * off, only the first file is kept.
     */
    readonly multiple: boolean;
    /**
     * Prevents the user from selecting, dropping or pasting files.
     */
    readonly disabled: boolean;
    /**
     * Ignores files pasted from the clipboard. Paste is on by default while the
     * focus is inside the dropzone.
     */
    readonly disablePaste: boolean;
    /**
     * Language of the built-in texts, for example "fr" or "nl-BE". If not
     * provided, the browser language is used.
     */
    readonly locale?: string;
    /**
     * Instruction line. `{browse}` is replaced by the browse link; without the
     * placeholder no link is shown. Defaults to a text in the language set by
     * `locale`.
     */
    readonly instruction?: string;
    /**
     * Text of the browse link inserted in the instruction. Defaults to a text
     * in the language set by `locale`.
     */
    readonly browseLabel?: string;
    /**
     * Instruction shown while files are dragged over the zone, in place of
     * `instruction`. Defaults to a text in the language set by `locale`, in the
     * singular or, with `multiple`, in the plural.
     */
    readonly dropInstruction?: string;
    /**
     * Line shown under the instruction, usually the constraints on the files,
     * for example "PDF or JPG · up to 25 MB".
     */
    readonly helperText?: string;
    /**
     * True while files are dragged over the dropzone.
     */
    dragActive: boolean;
    /****************************************************************************/
    /**
     * Emitted with the files the user selected, dropped or pasted, in
     * `detail.files`. The files are not validated.
     */
    filesSelected: EventEmitter<{
        /** The files, in the order the user provided them. */
        files: File[];
    }>;
    handlePaste(event: ClipboardEvent): void;
    /****************************************************************************/
    handleDisabledChange(disabled: boolean): void;
    /****************************************************************************/
    /**
     * Opens the file picker, as if the user had clicked the dropzone.
     * @returns {Promise<void>} Resolves once the picker was requested.
     */
    open(): Promise<void>;
    /**
     * Emits the selected files, keeping only the first one in single mode.
     * @param {File[]} files - The files to emit.
     */
    private emitFiles;
    /**
     * Tells whether a drag carries files, as opposed to text or a link.
     * @param {DragEvent} event - The drag event.
     * @returns {boolean} True when files are being dragged.
     */
    private hasFiles;
    private handleInputChange;
    private handleDragEnter;
    private handleDragOver;
    private handleDragLeave;
    private handleDrop;
    /****************************************************************************/
    render(): any;
}