import type { Simctl } from '../simctl';
/**
 * Retrieves the value of a Simulator environment variable
 *
 * @param varName - The name of the variable to be retrieved
 * @returns The value of the variable or null if the given variable
 * is not present in the Simulator environment
 * @throws {Error} If there was an error while running the command
 * @throws {Error} If the `udid` instance property is unset
 */
export declare function getEnv(this: Simctl, varName: string): Promise<string | null>;
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