@lwc/style-compiler/src/utils/selectors-scoping.ts

Transform style sheet to be consumed by the LWC engine

/*
 * Copyright (c) 2018, salesforce.com, inc.
 * All rights reserved.
 * SPDX-License-Identifier: MIT
 * For full license text, see the LICENSE file in the repo root or https://opensource.org/licenses/MIT
 */
export const HOST_ATTRIBUTE = '__hostAttribute__';

export const SHADOW_ATTRIBUTE = '__shadowAttribute__';