import type { OAuth2Client } from 'google-auth-library';
/** Run `fn` with `auth` as the active identity for the current async context. */
export declare function runWithAuth<T>(auth: OAuth2Client, fn: () => T): T;
/** The active per-request auth, or `undefined` outside any identity context. */
export declare function getActiveAuth(): OAuth2Client | undefined;
/**
 * Resolve the auth to use right now: the active per-request identity if one is
 * set, otherwise `fallback` (the server's default/global identity).
 */
export declare function resolveAuth(fallback: OAuth2Client): OAuth2Client;
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