import Account from "./Account";
/**
 * Upgrades a Neo2 account to a Neo3 account. If an encrypted account is provided, the returned account is also encrypted with the same passphrase.
 */
export declare function upgrade(account: Account, passphrase?: string, scryptParams?: {
    n: number;
    r: number;
    p: number;
    size: number;
}): Promise<Account>;
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