import type { FrameworkTokens } from './config';
/**
 * Watcher invoked whenever the token graph changes.
 */
export type TokenWatcher = (tokens: FrameworkTokens) => void;
/**
 * Registers a watcher that will be notified whenever tokens are merged or
 * applied. Returns an unsubscribe function.
 */
export declare function watchTokens(fn: TokenWatcher): () => void;
/**
 * Merges two token graphs. The resulting object is a new reference.
 */
export declare function mergeTokenGroups(base?: FrameworkTokens, partial?: FrameworkTokens): FrameworkTokens;
/**
 * Produces a flattened representation of the tokens suitable for setting CSS
 * custom properties.
 */
export declare function flattenTokens(tokens: FrameworkTokens): Array<[string, string | number]>;
/**
 * Applies the provided tokens onto the supplied element (defaults to
 * documentElement) using the `--fluent-` prefix convention.
 */
export declare function applyTokens(tokens: FrameworkTokens, root?: HTMLElement): void;
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