Migrate from v4 to v5
This document only covers the features present in v4 which have changed in some significant way in v5.
If you encounter any missing changes, please let us know and we will update this guide.
number utility replaced by num​
To avoid confusion with the native number
type, the number
namespace has been renamed to num
.
// v4
const res = number.isHex(d1);
// v5
const res = num.isHex(d1);
number.toFelt()
has been removed, if manual handling is necessary cairo.felt()
can be used.
bn.js no longer supported​
The bn.js
library has been removed in favor of using the native JavaScript BigInt
data type.
// v4
const qty = new BN('0x4a8bc');
// v5
const qty1 = BigInt('0x4a8bc');
const qty2 = 32786324915918425n;
The BigNumberish
type is now defined as:
- String representing a number: "123", "0xabc2"
- Number (max 53 bits): 123
- BigInt (max 255 bits): 12345612345n
Some commonly used BN
utility methods are of course no longer present, however, they have simple equivalents:
.mul()
and.div()
: common operators can be used with bigints:+
-
*
/
.umod()
can be easily replaced with:
// v4
const c = a.umod(b);
// v5
const tmp = a % b; // a and b are bigint
const c = tmp >= 0n ? tmp : tmp + b;
.toarray()
can be replaced withnum.hexToBytes(a)
ec (elliptic curve)​
With the bn.js
removal the accompanying elliptic curve libraries have also been replaced,
consequently many functions have been relocated or modified.
The concept of a key pair, where the private and public key are used as a single entity, has been removed.
ec.getKeyPair()
, ec.getKeyPairFromPublicKey()
and ec.genKeyPair()
do not exist anymore, corresponding
methods use the private key directly. Check the following examples:
Account
creation:
// v4
const privateKey0 = accountTestnet4PrivateKey;
const account0Address: string = accountTestnet4Address;
const starkKeyPair0 = ec.getKeyPair(privateKey0);
const account0 = new Account(provider, account0Address, starkKeyPair0);
// v5
const privateKey0 = accountTestnet4PrivateKey;
const account0Address: string = accountTestnet4Address;
const account0 = new Account(provider, account0Address, privateKey0);
Derive partial public key (starknetPubKey
):
// v4
const starknetPubKey = ec.getStarkKey(keyPair);
// v5
const starknetPubKey = ec.starkCurve.getStarkKey(privateKey); // only X part of full pubKey
Derive full public key (fullPubKey
):
// v4
const fullPubKey = encode.addHexPrefix(keyPair.getPublic('hex'));
// v5
const fullPubKey = encode.addHexPrefix(
encode.buf2hex(ec.starkCurve.getPublicKey(privateKey, false))
); // full key
ec.sign
and ec.verify
:
// v4
const signature = ec.sign(keyPair, msgHash);
const isVerified = ec.verify(inferredKeyPair, msgHash, signature);
// v5
const signature = ec.starkCurve.sign(msgHash, privateKey);
const verifStarknet = ec.starkCurve.verify(signature, msgHash, fullPubKeySource);
pedersen
hash calculation:
// v4
const hashMsg = hash.pedersen([account, price]);
// v5
const hashMsg = ec.starkCurve.pedersen(account, price);
'declareAndDeploy' renaming​
The account.declareDeploy()
method has been renamed to declareAndDeploy()
:
// v4
const response = await account0.declareDeploy({ contract: compiledTest, classHash: testClassHash });
// v5
const response = await account0.declareAndDeploy({
contract: compiledHelloSierra,
casm: compiledHelloCasm,
});
Note:
declare
anddeclareAndDeploy
no longer requireclassHash
! The new ec library is now able to calculate it quickly and does so automatically when it is not provided. If a contract has been written in Cairo 1 thecasm
property is needed.
Calldata and returned values​
Deep modifications and improvements have been performed concerning exchange of data with the Cairo contract functions.
The complete new rules are listed in this guide.
In short, it is easier to construct a list of parameters while relying on the built-in verification of the conformity to the abi.
Returned values from a Cairo 0 contract are identical, but returned values from a Cairo 1 contract are easier to recover.
stark.compileCalldata()
has been replaced by CallData.compile()
. Regardless, the new Contract.populate()
and myCallData.compile()
methods are the recommended way to create calldata.
Provider​
Constants for Provider
initialization have been updated. Only RpcProvider
is now authorized:
// v4
const providerTestnet = new Provider({ sequencer: { network: 'goerli-alpha' } });
// v5
const providerTestnet = new RpcProvider({ nodeUrl: `${myNodeUrl}` });
Provider.chainId()
has been removed, RpcProvider.getChainId()
should be used.
// v4
const chainId = myProvider.chainId();
// v5
const chainId = await myProvider.getChainId();
Uint256​
The approach to create a uint256
variable has changed:
// v4
const amountIn = uint256.bnToUint256(amountToSwap);
// v5
const amountIn: Uint256 = cairo.uint256(50000n);
get-starknet​
In your DAPP React code you can connect to ArgentX or Braavos wallets using the get-starknet
library.
The current v2.1.0 version is not yet compatible with starknet.js v5.
An update is expected.