export type DevhubAuthStrategy = 'AUTO' | 'JWT' | 'AUTH_URL' | 'REUSE' | 'NONE';
export declare const prepareForJwt: (homeDir: string) => string;
export declare const prepareForAuthUrl: (homeDir: string) => string;
/**
 * Inspects the environment (via AuthStrategy) and authenticates to a devhub via JWT or AuthUrl
 * Sets the hub as default for use in tests
 *
 * @param homeDir the testSession directory where credential files will be written
 * @param authStrategy the authorization method to use
 *
 * reads environment variables that are set by the user OR via transferExistingAuthToEnv
 *   for jwt: TESTKIT_HUB_USERNAME, TESTKIT_JWT_CLIENT_ID, TESTKIT_JWT_KEY
 *     optional but recommended: TESTKIT_HUB_INSTANCE
 *   required for AuthUrl: TESTKIT_AUTH_URL
 */
export declare const testkitHubAuth: (homeDir: string, authStrategy?: DevhubAuthStrategy) => void;
export declare const getAuthStrategy: () => DevhubAuthStrategy;
/**
 * For scenarios where a hub has already been authenticated in the environment and the username is provided,
 * set the environment variables from the existing hub's information.
 *
 * reads environment variables
 *   TESTKIT_HUB_USERNAME : the username (not alias) of a devHub
 *
 * write environment variables
 *  TESTKIT_AUTH_URL (if using refreshToken)
 *  TESTKIT_JWT_KEY,TESTKIT_JWT_CLIENT_ID,TESTKIT_HUB_INSTANCE (if using jwt)
 *
 */
export declare const transferExistingAuthToEnv: (authStrategy: DevhubAuthStrategy) => void;