import type { OAuth2Client } from "google-auth-library";
import { type CredentialStore } from "./credential-store.js";
export declare const GMAIL_READONLY_SCOPE = "https://www.googleapis.com/auth/gmail.readonly";
export type AuthFailureKind = "missing_client_id" | "missing_client_secret" | "missing_refresh_token";
export interface AuthFailure {
    readonly kind: AuthFailureKind;
    readonly message: string;
}
export declare class AuthSetupError extends Error {
    readonly failure: AuthFailure;
    constructor(failure: AuthFailure);
}
export declare function buildOAuthClient(store?: CredentialStore): OAuth2Client;
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