/**
 * Font size picker — custom popup with preset sizes, live preview, and custom input.
 */
export declare class FontSizeFeature {
    private editorArea;
    private picker;
    private savedRange;
    private previewSpan;
    private _pickerAC;
    /** Called after a size is successfully applied — used by RayEditor to push history. */
    onApply?: () => void;
    constructor(editorArea: HTMLElement);
    show(anchorBtn: HTMLElement): void;
    private previewSize;
    private removePreview;
    private applySize;
    private wrapWithSize;
    private clearSizeFromRange;
    /** Strip font-size from child spans inside an extracted DocumentFragment. */
    private stripFragmentFontSize;
    destroy(): void;
    private close;
}
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