import { PptxElement } from 'pptx-viewer-core';
import { ChangeCaseMode } from 'pptx-viewer-shared';
/** Toggle the strikethrough flag. */
export declare function toggleStrikethroughPatch(el: PptxElement): Partial<PptxElement>;
/** Set the font family, preserving other text-style fields. */
export declare function setFontFamilyPatch(el: PptxElement, fontFamily: string): Partial<PptxElement>;
/** Set the character spacing (1/100 pt, OOXML `spc` units). */
export declare function setCharacterSpacingPatch(el: PptxElement, spacing: number): Partial<PptxElement>;
/**
 * Rewrite the element's full text to the given case, via the shared
 * `applyCaseTransformToSegments` (selection-free: transforms every run).
 * Falls back to a `textCaps` style toggle for elements with no `textSegments`
 * (e.g. table cells), matching React's behaviour.
 */
export declare function changeCasePatch(el: PptxElement, mode: ChangeCaseMode): Partial<PptxElement>;
/** Reset bold/italic/underline/strikethrough/highlight to their defaults. */
export declare function clearFormattingPatch(el: PptxElement): Partial<PptxElement>;
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