import { InvalidEnvironmentVariableError } from './InvalidEnvironmentVariableError';
/**
 * Indicates a required environment variable is not defined.
 */
export declare class MissingEnvironmentVariableError extends InvalidEnvironmentVariableError {
    /**
     * Initializes a new instance of the [[MissingEnvironmentVariableError]] class.
     * @param variableName The name of the missing environment variable.
     * @param message A description of the error.
     * @param innerError The error that caused the [[MissingEnvironmentVariableError]].
     */
    constructor(variableName: string, message?: string, innerError?: Error);
}