import { ClosureTree } from "./closure/ClosureTree";
import { Environment } from "./Environment";
export declare type TargetOption = 'esm' | 'commonjs';
export declare type DefineValueType = string | boolean | number;
export declare type WarningLevelOption = 'show' | 'hideLib' | 'hideUser' | 'hide';
export interface PluginDebugOptions {
    /** Enable log transformed Closure module to build directory, defaults to false. */
    logTransformed?: boolean;
}
export interface PluginOptions {
    /** Path to Closure library base.js file, must be absolute or relative from the environment context. */
    base?: string;
    /** sources List of absolute patterns, or relative from the environment context. */
    sources: string | string[];
    /** Closure module transform target, "esm" or "commonjs", defaults to "esm". */
    target?: TargetOption;
    /**
     * List of string and value to override the goog.define expression, if the name part is omitted, its value will be true.
     * The value could be string, boolean and number.
     */
    defs?: (string | [string] | [string, DefineValueType])[];
    /** "show" show all warnings, "hidelib" hide warnings in Closure library modules and show warnings in user modules, "hideUser" opposite to "hideLib", "hide" hide all warnings, defualts to "hideLib". */
    warningLevel?: WarningLevelOption;
    /**  */
    debug?: PluginDebugOptions;
}
export declare class GoogleClosureLibraryWebpackPlugin {
    readonly options: PluginOptions;
    readonly tree: ClosureTree | undefined;
    readonly env: Environment | undefined;
    constructor(options: PluginOptions);
    apply(compiler: any): void;
}