/**
 * Contract for storing and providing OAuth access/refresh tokens.
 * Implement this interface to customize how tokens are persisted
 * (e.g. in-memory only, encrypted storage, cookie-based, etc.)
 */
export interface OAuthTokenStore {
    getAccessToken(): Promise<string | null>;
    getRefreshToken(): Promise<string | null>;
    /** Returns the epoch (ms) at which the access token expires, or null if unknown. */
    getAccessTokenExpiry(): Promise<number | null>;
    /** Returns the epoch (ms) at which the refresh token expires, or null if unknown. */
    getRefreshTokenExpiry(): Promise<number | null>;
    setTokens(access: string, refresh: string, expiresIn?: number, refreshExpiresIn?: number): Promise<void>;
    clear(): Promise<void>;
}