import type { ContentModelSegmentFormat, ContentModelText, FormatContentModelContext, FormatContentModelOptions, IEditor, ShallowMutableContentModelDocument, ShallowMutableContentModelParagraph } from 'roosterjs-content-model-types';
/**
 * Invoke a callback to format the text segment before the selection marker using Content Model
 * @param editor The editor object
 * @param callback The callback to format the text segment.
 * @returns True if the segment before cursor is found and callback is called, otherwise false
 */
export declare function formatTextSegmentBeforeSelectionMarker(editor: IEditor, callback: (model: ShallowMutableContentModelDocument, previousSegment: ContentModelText, paragraph: ShallowMutableContentModelParagraph, markerFormat: ContentModelSegmentFormat, context: FormatContentModelContext) => boolean, options?: FormatContentModelOptions): boolean;