import type { ISize } from './callback';
/**
 * Collection of environment variables that are known to a shell and are passed in and out of
 * commands.
 */
export declare class Environment extends Map<string, string> {
    constructor(color: boolean, shellId: string, browsingContextId: string | undefined);
    /**
     * Copy environment variables into a command before it is run.
     */
    copyIntoCommand(target: {
        [key: string]: string;
    }): void;
    getNumber(key: string): number | null;
    getPrompt(): string;
    get color(): boolean;
    names(): string[];
    setSize(size: ISize): void;
}