/**
 * In-document theme overrides: a partial theme from the document root's
 * `themeOverrides` prop, deep-merged over the resolved named theme.
 */
import type { ThemeConfig } from '../styles';
import { type DesignSystem } from '@json-to-office/shared';
export interface ThemeOverrides extends DesignSystem {
    colors?: Partial<ThemeConfig['colors']>;
    fonts?: Partial<ThemeConfig['fonts']>;
    styles?: ThemeConfig['styles'];
}
/**
 * Merge a partial override object over a resolved theme.
 *
 * - `colors`: per-token replacement.
 * - `fonts`: per-role merge (an override role only replaces the fields it
 *   sets, so `{ heading: { family: "Geist" } }` keeps the theme's size).
 * - `styles`: per-style merge, one level deep — nested objects inside a style
 *   (spacing, lineSpacing, borders, indent) are replaced wholesale.
 */
export declare function applyThemeOverrides(theme: ThemeConfig, overrides: ThemeOverrides | undefined): ThemeConfig;
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