export type Theme = "light" | "dark" | "auto" | "neon";
/** Resolves "auto" to the OS preference; "neon" and explicit "light"/"dark" pass through. */
export declare function resolveTheme(theme: Theme): "light" | "dark" | "neon";
/** Writes the theme choice to localStorage. */
export declare function persistTheme(theme: Theme): void;
/** Reads the persisted theme from localStorage. Returns null if none stored. */
export declare function loadPersistedTheme(): Theme | null;
/**
 * Applies the theme to an element by setting `data-theme` to the resolved value.
 * Pass the root element of the UI (e.g. `.op-root`).
 */
export declare function applyTheme(el: HTMLElement, theme: Theme): void;
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