import type { DesignTokens, DtifFlattenedToken } from '../core/types.js';
import { type NameTransform } from '../utils/tokens/index.js';
export interface CssOutputOptions {
    /** Optional transform applied to token path segments before generating vars */
    nameTransform?: NameTransform;
    /** Mapping of theme names to CSS selectors. Defaults to :root and [data-theme="theme"]. */
    selectors?: Record<string, string>;
}
/**
 * Generate CSS custom property declarations for the provided tokens.
 *
 * Accepts either DTIF token documents or pre-flattened DTIF token arrays for
 * each theme. The default theme uses `:root` and variants default to
 * `[data-theme='name']` unless overridden via `selectors`.
 */
export declare function generateCssVariables(tokensByTheme: Record<string, DesignTokens | readonly DtifFlattenedToken[]>, options?: CssOutputOptions): string;
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