/**
 * Assertion helpers for site-native theme files (#944).
 *
 * Drop this into a consuming repo's CI/test suite to gate a native theme
 * file against the token contract:
 *
 * ```ts
 * import { assertNativeTheme } from '@lgtm-hq/turbo-themes/native-theme';
 * import { readFileSync } from 'node:fs';
 *
 * assertNativeTheme(readFileSync('src/styles/my-theme.css', 'utf8'), 'my-theme');
 * ```
 */
import { type NativeThemeValidation } from './validator.js';
export declare class NativeThemeValidationError extends Error {
    readonly validation: NativeThemeValidation;
    constructor(validation: NativeThemeValidation, message: string);
}
/**
 * Assert a native theme given as CSS source; throws with a full report when
 * the theme does not satisfy the contract.
 */
export declare function assertNativeTheme(css: string, source?: string): NativeThemeValidation;
/**
 * Assert a native theme given as a token map (`--turbo-x` → value).
 */
export declare function assertNativeThemeTokens(tokens: Record<string, unknown>, source?: string): NativeThemeValidation;
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