/**
 * Merge `override` onto `base`, recursing into plain objects.
 *
 * `undefined` means "say nothing" and leaves the base value alone; `null` means
 * "clear it", so `{ image: null }` removes a default icon rather than being
 * ignored. There are no arrays anywhere in a theme, so a plain recursive merge
 * is enough.
 *
 * @template {Record<string, any>} T
 * @param {T} base
 * @param {Record<string, any> | undefined} override
 * @returns {T}
 */
export function mergeTheme<T extends Record<string, any>>(base: T, override: Record<string, any> | undefined): T;
/**
 * Fill every gap in a user theme and narrow it to one device.
 *
 * @param {Theme | undefined} theme
 * @param {Device} device
 * @returns {ResolvedTheme}
 */
export function resolveTheme(theme: Theme | undefined, device: Device): ResolvedTheme;
/**
 * The breakpoint a theme asks for, readable before the full resolve (the
 * device is not known until the breakpoint is).
 *
 * @param {Theme | undefined} theme
 * @returns {number}
 */
export function breakpointOf(theme: Theme | undefined): number;
import type { Theme } from '../types.js';
import type { Device } from '../types.js';
import type { ResolvedTheme } from '../types.js';