/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 *
 */

export declare const canUseDOM: boolean;
export declare type canUseDOM = typeof canUseDOM;
/**
 * Adds :not(#\#) to selectors to increase their specificity.
 * This is used to polyfill @layer
 */
export declare function addSpecificityLevel(
  cssText: string,
  index: number,
): string;