import { IPostCSS } from "./i-postcss";
import { IPostCSSProcessOptions } from "./i-postcss-process-options";
import { IPostCSSProcessResult } from "./i-postcss-process-result";
import { IPostCSSConfiguration } from "./i-postcss-configuration";
/**
 * A class wrapper for PostCSS
 */
export declare class PostCSS implements IPostCSS {
    private readonly config;
    /**
     * The current PostCSS Processor instance
     * @type {Processor}
     */
    private postCSSProcessor;
    constructor(config: IPostCSSConfiguration);
    /**
     * Retrieves a hook that can pass default configuration options to PostCSS plugins
     * @returns {PluginConfigurationHook}
     */
    private readonly defaultPluginOptionsHook;
    /**
     * Retrieves a hook that can pass forced configuration options to PostCSS plugins
     * @returns {PluginConfigurationHook}
     */
    private readonly forcedPluginOptionsHook;
    /**
     * Processes the provided template with the provided options
     * @param {IPostCSSProcessOptions} options
     * @returns {Promise<IPostCSSProcessResult>}
     */
    process(options: IPostCSSProcessOptions): Promise<IPostCSSProcessResult>;
    /**
     * Prepares the PostCSSProcessor. It will reuse the existing one if the provided plugins hasn't changed
     * from a previous compilation
     * @param {IPostCSSProcessOptions} options
     */
    private preparePostCSSProcessor;
    /**
     * Merges the plugins provided by the user with the default PostCSS plugins used by Fovea
     * @param {IPostCSSProcessOptions} options
     * @returns {postcss.AcceptedPlugin[]}
     */
    private mergeUserProvidedPluginsWithDefaults;
    /**
     * Gets the name of a Postcss plugin
     * @param {postcss.AcceptedPlugin} plugin
     * @returns {string | undefined}
     */
    private getPluginName;
    /**
     * Returns true if the given Postcss plugin is configurable
     * @param {AcceptedPlugin} plugin
     * @returns {boolean}
     */
    private pluginIsConfigurable;
    /**
     * Prepares the given plugin, invoking the given hook if provided with one
     * @param {postcss.AcceptedPlugin} plugin
     * @param {PluginConfigurationHook} userHook
     * @returns {postcss.AcceptedPlugin}
     */
    private preparePluginWithHook;
}