type OptionalDefaultGate<TKey extends string> = (key: TKey, defaultValue?: boolean) => boolean;
type TokenSourcedAccount = {
    tokenSource?: string | null;
};
export declare function listTokenSourcedAccounts<TAccount extends TokenSourcedAccount>(accounts: readonly TAccount[]): TAccount[];
export declare function createUnionActionGate<TAccount, TKey extends string>(accounts: readonly TAccount[], createGate: (account: TAccount) => OptionalDefaultGate<TKey>): OptionalDefaultGate<TKey>;
export {};