Function signTransaction

signTransaction(
    transaction: Transaction,
    signer: Signer,
    accountId?: string,
    networkId?: string,
): Promise<[Uint8Array, SignedTransaction]>

signTransaction(
    receiverId: string,
    nonce: bigint,
    actions: Action[],
    blockHash: Uint8Array,
    signer: Signer,
    accountId?: string,
    networkId?: string,
): Promise<[Uint8Array, SignedTransaction]>