/**
 * Text formatting features: bold, italic, underline, color, etc.
 */
export declare class FormattingFeature {
    private editorArea;
    private activePopup;
    private _popupAC;
    constructor(editorArea: HTMLElement);
    showTextColorPicker(anchorBtn: HTMLElement): void;
    showBackgroundColorPicker(anchorBtn: HTMLElement): void;
    private _showColorPicker;
    private _closePopup;
    private _saveSelection;
    private _restoreSelection;
    transformSelectedText(mode: 'upper' | 'lower'): void;
    toggleTextCase(): void;
    private applyTextTransformation;
}
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