import { Extension } from '../../core/Extension.js';
/**
 * Letter spacing value
 * @typedef {string|number} LetterSpacingValue
 * @description Spacing with optional unit (e.g., '-0.75pt', '1px', 0.5)
 */
/**
 * Configuration options for LetterSpacing
 * @typedef {Object} LetterSpacingOptions
 * @category Options
 * @property {string[]} [types=['textStyle']] - Mark types to add letter spacing support to
 */
/**
 * Attributes for letter spacing
 * @typedef {Object} LetterSpacingAttributes
 * @category Attributes
 * @property {LetterSpacingValue} [letterSpacing] - Letter spacing with unit
 */
/**
 * @module LetterSpacing
 * @sidebarTitle Letter Spacing
 * @snippetPath /snippets/extensions/letter-spacing.mdx
 */
export const LetterSpacing: Extension<{
    types: string[];
}, Record<string, never>>;
/**
 * Letter spacing value
 */
export type LetterSpacingValue = string | number;
/**
 * Configuration options for LetterSpacing
 */
export type LetterSpacingOptions = Object;
/**
 * Attributes for letter spacing
 */
export type LetterSpacingAttributes = Object;
//# sourceMappingURL=letter-spacing.d.ts.map