import { LitElement, nothing, PropertyValues, TemplateResult } from 'lit';
import { Ref } from 'lit/directives/ref.js';
import './ix-file-chip.js';
import DataStorageUnit from './data-storage-unit.js';
import UploaderFile from './internal/uploader-file.js';
import '@digital-realty/ix-dialog/ix-dialog.js';
export declare class IxFileUploader extends LitElement {
    static readonly styles: import("lit").CSSResult[];
    /** @nocollapse  */
    static readonly formAssociated = true;
    private readonly internals;
    dropzoneRef: Ref<HTMLLabelElement>;
    fileRef: Ref<HTMLInputElement>;
    showTemplateFileLink: boolean;
    allowMultipleFiles: boolean;
    allowDuplicates: boolean;
    headerText: string;
    bodyText: string;
    hintText: string | undefined;
    ariaLabel: string;
    defaultFiles: Array<UploaderFile>;
    allowDeleteDefaultFiles: boolean;
    hideBody: boolean;
    extensions: string[];
    maxFileCount: number;
    maxFileSizeUnit: DataStorageUnit;
    maxFileSizeValue: number;
    name: string;
    error: boolean;
    askConfirmationOnDeleteFile: boolean;
    deleteConfirmationDialogLabel: string;
    isDeleteBulkFileDialogOpen: boolean;
    pendingFileDeletion: UploaderFile | undefined;
    files: Array<UploaderFile>;
    errors: Array<string>;
    /**
     * Alternating polite live regions used to announce non-error status
     * updates (successful uploads, removals). Two regions are toggled
     * between so that the DOM node hosting the message is fully replaced
     * on each announcement; this is more reliable across NVDA/JAWS than
     * mutating the text of a single node, especially for repeated
     * announcements with identical wording.
     */
    private statusMessage;
    private statusMessageAlt;
    private statusRegionToggle;
    private statusAnnounceTimer;
    private maxFileSizeInBytes;
    /**
     * The associated form element with which this element's value will submit.
     */
    get form(): HTMLFormElement | null;
    private onDrop;
    private onFileChange;
    get allowedMaxFileCount(): number;
    private process;
    private updateState;
    private onFilesUploaded;
    /**
     * Push a message to one of the two alternating polite live regions.
     *
     * Screen readers, particularly NVDA, sometimes miss updates to a
     * live region when consecutive announcements share the same wording
     * or arrive within the same microtask. Toggling between two regions
     * (and only populating the newly-active one after a short delay)
     * ensures each announcement is treated as a distinct change and is
     * reliably picked up.
     */
    private announce;
    disconnectedCallback(): void;
    private onFileClick;
    private onFileDelete;
    handleDeleteBulkFile(): void;
    deleteLastFileWithoutConfirmation(): void;
    private openFileUploadDialog;
    protected firstUpdated(): void;
    protected update(changedProperties: PropertyValues): void;
    isFileDeletable(file: UploaderFile): boolean;
    private renderFileList;
    protected updated(_: PropertyValues): void;
    renderDeleteBulkFileConfirmationDialog(): TemplateResult<1> | typeof nothing;
    renderHintText(): TemplateResult<1> | typeof nothing;
    renderErrors(): TemplateResult<1>;
    /**
     * Visually hidden alternating polite live regions used to announce
     * non-error status updates (successful uploads, removals) without
     * stealing focus from the user. Only one region contains text at a
     * time; alternating between them makes repeated announcements
     * detectable by screen readers.
     */
    renderStatusRegion(): TemplateResult<1>;
    renderBody(): TemplateResult<1>;
    protected render(): TemplateResult<1>;
}