/**
 * Provides a function to return a new PostCSS configuration setting the extract parameter.
 *
 * @param {object}   [opts] - Optional parameters.
 *
 * @param {string}   [opts.extract] - Name of CSS file to extract to...
 *
 * @param {boolean}  [opts.compress=false] - Compress CSS.
 *
 * @param {boolean}  [opts.sourceMap=false] - Generate source maps.
 *
 * @returns {{extensions: string[], extract, sourceMap: boolean, plugins: (*)[], use: string[], inject: boolean}} PostCSS config
 */
declare function postcssConfig({
  extract,
  compress,
  sourceMap,
}?: {
  extract?: string;
  compress?: boolean;
  sourceMap?: boolean;
}): {
  extensions: string[];
  extract: any;
  sourceMap: boolean;
  plugins: any[];
  use: string[];
  inject: boolean;
};

/**
 * Convenience method to create a Terser config without needing to store a local file. Both class and function names
 * are maintained which is useful on Foundry for hook notifications and any potential overriding.
 *
 * @param {object}         [opts] - Optional parameters.
 *
 * @param {boolean}        [opts.keep_classnames=true] - When true does not mangle class names. Useful for Foundry!
 *
 * @param {boolean|RegExp} [opts.keep_fnames=true] - When true does not mangle function names; a RegExp will
 *                                                   selectively mangle function names.
 *
 * @returns {import('terser').MinifyOptions} A Terser configuration file.
 */
declare function terserConfig({
  keep_classnames,
  keep_fnames,
}?: {
  keep_classnames?: boolean;
  keep_fnames?: boolean | RegExp;
}): any;

/**
 * Returns the TyphonJS Runtime Library module substitution plugin.
 *
 * Add this plugin to substitute NPM module paths for the Foundry VTT hosted module.
 *
 * @returns {{name: string, options: (object) => void, outputOptions: (object) => void}} The plugin.
 */
declare function typhonjsRuntime(): {
  name: string;
  options: (object: any) => void;
  outputOptions: (object: any) => void;
};

export { postcssConfig, terserConfig, typhonjsRuntime };