/**
 * Browser-runtime side of the panel's live setting overrides: the page's
 * adapter onto the shared override module. Storage is the page's own
 * `localStorage` (written by the panel; same origin), and the live port is the
 * page channel the server rebroadcasts panel changes on.
 */
import type { ViteHotLike } from './page-channel.js';
import { type SettingsOverride } from '../../types/timeline.js';
/** `import.meta.hot` of the calling module, when it has one. */
type Hot = ViteHotLike | undefined;
/**
 * Applies the persisted override immediately, then again whenever the panel
 * pushes a change over the page channel. `apply` receives the full override
 * object each time and should act only on the fields it owns.
 */
export declare const subscribeOverride: (hot: Hot, apply: (override: SettingsOverride) => void) => void;
/** One handler per override key a consumer owns. */
export type OverrideHandlers = {
    [K in keyof SettingsOverride]?: (value: NonNullable<SettingsOverride[K]>) => void;
};
/**
 * {@link subscribeOverride} for consumers that own a few keys: each handler
 * runs with its key's value whenever the override carries one, and is
 * skipped while the key is unset (the config-time default stands).
 */
export declare const subscribeOverrideKeys: (hot: Hot, handlers: OverrideHandlers) => void;
export {};
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