import { PptxElement, TextStyle } from 'pptx-viewer-core';
/** Set the body text direction (`a:bodyPr/@vert`). */
export declare function setTextDirectionPatch(el: PptxElement, textDirection: TextStyle['textDirection']): Partial<PptxElement>;
/** Set the body column count (`a:bodyPr/@numCol`). */
export declare function setColumnCountPatch(el: PptxElement, columnCount: number): Partial<PptxElement>;
/** True when the element currently carries a text shadow. */
export declare function hasTextShadow(el: PptxElement | undefined): boolean;
/**
 * Toggle PowerPoint's default text shadow on or off.
 *
 * Off clears every shadow field rather than only the colour: leaving a stale
 * blur/offset behind would make the next "on" inherit settings the user never
 * chose. The on-values are React's, so a deck shadowed in one binding looks the
 * same in the others.
 */
export declare function toggleTextShadowPatch(el: PptxElement): Partial<PptxElement>;
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