export interface StyleModule {
    id: string;
    css: string;
    layer?: 'base' | 'components' | 'utilities' | string;
}
/**
 * Injects a style module into the document head. When running in SSR mode the
 * CSS string is returned so it can be inlined manually.
 */
export declare function injectStyle(style: StyleModule): string | void;
/**
 * Removes an injected style when no consumers remain.
 */
export declare function removeStyle(id: string): void;
/**
 * Serialises all injected styles – useful when rendering on the server.
 */
export declare function renderStylesToString(): string;
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