import * as React from 'react';
import type { IThumbnailPickerPreviewProps } from './IThumbnailPickerPreviewProps';
export interface IThumbnailPickerPreviewState {
    /**
     * Whether should show the loading spinner.
     */
    isUploadInProgress: boolean;
    showFilePicker: boolean;
}
export declare class ThumbnailPickerPreview extends React.PureComponent<IThumbnailPickerPreviewProps, IThumbnailPickerPreviewState> {
    private _filePicker;
    private _thumbnailWrapperRef;
    constructor(props: IThumbnailPickerPreviewProps);
    UNSAFE_componentWillReceiveProps(nextProps: IThumbnailPickerPreviewProps): void;
    render(): JSX.Element;
    private _handleChangeImageClick;
    private _handleUploadFileStart;
    private _handleUploadError;
    private _handleSelectFile;
    private _handleImageChangeFocus;
    private _onFilePickerClose;
}
//# sourceMappingURL=ThumbnailPickerPreview.d.ts.map