/** Runs when the query starts matching; an optional returned teardown runs when it stops. */
export type ResponsiveSetup = (context: {
    matches: boolean;
}) => void | (() => void);
/**
 * Run `setup` whenever `query` starts matching, and its returned teardown when it
 * stops. A string is any media query - '(prefers-reduced-motion: reduce)' is just
 * a query. The `{ reducedMotion }` form reuses the reduced-motion source, so it
 * honors the app-level override too. Returns an unsubscribe that runs any live
 * teardown and stops listening.
 *
 * SSR-safe and client-only: with no matchMedia the setup never runs server-side -
 * it runs on mount when the query matches, never with a guessed server value.
 */
export declare function responsive(query: string | {
    reducedMotion: boolean;
}, setup: ResponsiveSetup): () => void;
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