/**
 * Generic theme resolution: deep-merges a template's defaultTheme with the user theme from Core.
 * Immutable — never mutates inputs.
 * resolveTheme(defaultTheme, userTheme) → fullyPopulatedTheme
 */
/**
 * Returns the resolved theme: defaultTheme deep-merged with user theme.
 * Use in template components so all styling comes from one source.
 */
export declare function resolveTheme<T extends Record<string, unknown>>(defaultTheme: T, userTheme: unknown): T;