import { InjectionToken } from '@angular/core';
/**
 * By default, Origami will not parse or register styles with ShadyCSS if the
 * platform supports native CSS custom properties. However, ShadyCSS also
 * supports the deprecated `@apply` mixin proposal. If a project is using
 * `@apply` in CSS, this token should be provided with a true value.
 */
export declare const USING_APPLY: InjectionToken<boolean>;
/**
 * Processes all current document stylesheets added by Angular and registers
 * them with ShadyCSS.
 *
 * This function will also parse external `<link>` stylesheets if native
 * CSS custom properties are not supported, or if `usingApply` is set to true.
 *
 * @param usingApply if true, parse stylesheets regardless of native support,
 *   since no browser supports `@apply` natively
 * @returns a Promise when all stylesheets have been processed
 */
export declare function processStylesheets(usingApply?: boolean): Promise<void>;
/**
 * Returns true if the provided node is a `<style>` node.
 *
 * @param node the node to test
 * @returns true if the node is a `<style>` node
 */
export declare function isStyleNode(node: Node): node is HTMLStyleElement;