import { EnvironmentSet } from 'lemon-core/dist/environ';
/**
 * type: `CrendentialForAWS`
 * - common interface for AWS credentials.
 * - used for `AWS.config.credentials` or `AWS.Credentials`
 */
export interface CrendentialForAWS {
    /**
     * AWS access key ID
     */
    readonly accessKeyId: string;
    /**
     * AWS secret access key
     */
    readonly secretAccessKey: string;
    /**
     * A security or session token to use with these credentials. Usually
     * present for temporary credentials.
     */
    readonly sessionToken?: string;
    /** (optional) the loaded profile name if applicable */
    readonly profile?: string;
}
/**
 * Simple string set
 */
type SimpleStringSet = {
    [key: string]: string;
};
/**
 * loader `<profile>.yml`
 *
 * **Determine Environ Target**
 * 1. ENV 로부터, 로딩할 `env.yml` 파일을 지정함.
 * 2. STAGE 로부터, `env.yml`내 로딩할 환경 그룹을 지정함.
 *
 * example:
 * `$ ENV=lemon STAGE=dev nodemon express.js --port 8081`
 *
 * @param process the main process instance.
 * @param options (optional) default option.
 */
export declare const loadEnviron: (process: any, options?: EnvironmentSet) => SimpleStringSet;
interface Logger {
    (title: string, msg?: string): void;
    (title: string, ...args: any[]): void;
}
/**
 * load AWS credential profile via env.NAME
 *
 * ```sh
 * # load AWS 'lemon' profile, and run test.
 * $ NAME=lemon npm run test
 * ````
 * @param $proc     process (default `global.process`)
 * @param $info     info logger (default `console.info`)
 * @returns profile-name defined as `NAME` in environment (none is ignored).
 */
export declare const loadProfile: ($proc?: {
    env?: any;
}, options?: {
    info?: Logger;
}) => string;
/**
 * dynamic loading credentials by profile. (search PROFILE -> NAME)
 *
 * !WARN! - could not catch AWS.Error `Profile null not found` via callback.
 *
 * @param profile   profile name of AWS.
 *
 * @deprecated use `asyncCredentials()` instead.
 */
export declare const credentials: (profile: string) => string;
/**
 * return whether AWS credentials set
 *
 * @deprecated use `asyncCredentials` instead.
 */
export declare const hasCredentials: () => boolean;
/**
 * dynamic loading credentials by profile. (search PROFILE -> NAME)
 *
 * @returns {Promise<CrendentialForAWS>} - AWS credentials
 */
export declare const asyncCredentials: (profile: string) => Promise<CrendentialForAWS>;
export {};