import { Logger, Provider } from "@smithy/types";
export type GetterFromEnv<T> = (env: Record<string, string | undefined>) => T | undefined;
/**
 * Get config value given the environment variable name or getter from
 * environment variable.
 */
export declare const fromEnv: <T = string>(envVarSelector: GetterFromEnv<T>, logger?: Logger) => Provider<T>;