import { Base64String, StringMap } from '@naturalcycles/js-lib';
/**
 * Loads plaintext secrets from process.env, removes them, stores locally.
 * Make sure to call this function early on server startup, so secrets are removed from process.env
 *
 * Does NOT delete previous secrets from secretMap.
 */
export declare function loadSecretsFromEnv(): void;
/**
 * Removes process.env.SECRET_*
 */
export declare function removeSecretsFromEnv(): void;
/**
 * Does NOT delete previous secrets from secretMap.
 *
 * If SECRET_ENCRYPTION_KEY argument is passed - will decrypt the contents of the file first, before parsing it as JSON.
 *
 * Whole file is encrypted.
 * For "json-values encrypted" style - use `loadSecretsFromEncryptedJsonFileValues`
 */
export declare function loadSecretsFromEncryptedJsonFile(filePath: string, secretEncryptionKey?: Base64String): void;
/**
 * Whole file is NOT encrypted, but instead individual json values ARE encrypted..
 * For whole-file encryption - use `loadSecretsFromEncryptedJsonFile`
 */
export declare function loadSecretsFromEncryptedJsonFileValues(filePath: string, secretEncryptionKey?: Base64String): void;
export declare function secret<T = string>(k: string, parseJson?: boolean): T;
export declare function secretOptional<T = string>(k: string, parseJson?: boolean): T | undefined;
export declare function getSecretMap(): StringMap;
/**
 * REPLACES secretMap with new map.
 */
export declare function setSecretMap(map: StringMap): void;