Introduction

Quick implementation of near in your application. Generation of typed smart contract methods. Including ready for use typed methods in popular smart contract Standards.

Navigation

• install
• example Quick example
• codegen Generate methods of contract example-codegen
• api
  • NearProvider define near in app
  • NearEnvironmentProvider switch env (TestNet, MainNet..)
  • useNearUser complex example
  • useNearUser batch Transactions
  • useNearQuery use view methods
  • useNearMutation use change methods
  • useNearStatus get result (transactions hashes or error)
• contracts
  • ft Fungible Token Standard (nep141) methods
  • nft Non Fungible Token Standard (nep171) methods
  • mt Multi Token Standard (nep245) methods
  • storage Storage Management (nep145) methods
  • Other Standards
• utils Other utils

Setup

You'll need to install the package from npm npm i react-near near-api-js.

If you need to generate contract methods npm i -D json-schema-to-typescript fzstd.

Quick Example

// config.ts
const FT_CONTRACT_NAME = 'mfight-ft.testnet';

// app.tsx
function MyApp({ Component, pageProps }: AppProps) {
   return (
      <NearEnvironmentProvider defaultEnvironment={NearEnvironment.TestNet}>
         <NearProvider authContractId='my-contract.testnet'>
            <Component {...pageProps} />
         </NearProvider>
      </NearEnvironmentProvider>
   );
}

// page.tsx
function Page() {
   const nearUser = useNearUser();

   const { data: ftBalance = '0', refetch: refetchFtBalance } = useFtBalanceOf({
      contract: 'mfight-ft.testnet',
      variables: { account_id: nearUser.address as string },
      poolInterval: 1000 * 60 * 5,
      skip: !nearUser.isConnected,
   });
   const [transferCall] = useFtTransferCall({
      contract: 'mfight-ft.testnet',
      gas: GAS_FOR_FT_TRANSFER_CALL,
   });

   const handleTransferCall = () =>
      transferCall(
         { receiver_id: 'example.near', amount: 1000, msg: JSON.stringify({}) },
         parseNearAmount('0.01'),
      );
   const handleSignIn = () => nearUser.connect();

   return (
      <div>
         {nearUser.isConnected && (
            <>
               <span>NEAR balance: {nearUser.balance}</span>
               <span>FT balance: {formatNearAmount(ftBalance, 24)}</span>
               <button onClick={handleTransferCall}>transfer ft</button>
            </>
         )}
         {!nearUser.isConnected && <button onClick={receiver_id}>Connect NEAR</button>}
      </div>
   );
}

Codegen

If you want to generate all the methods of your near contract, you have to:

• you need to add the abi feature, as in this example abi-example
• run npm i -D json-schema-to-typescript fzstd
• add config to your project react-near.json

{
   "dist": "near-api",
   "type": "default", // or "raw", for exclude all hooks
   "contracts": [
      {
         "name": "Nft",
         "abi": "abi/nft.json",
         "mainnet": "mfight-nft.near",
         "testnet": "mfight-nft_v2.testnet"
      },
      {
         "name": "Market",
         "mainnet": "mfight-nft.near",
         "testnet": "mfight-nft_v2.testnet"
      }
   ]
}

• run script node ./node_modules/react-near/codegen.js

There is also an example: example-app

Api

NearProvider

Create a context of NEAR in the application

// app.tsx
function MyApp({ Component, pageProps }: AppProps) {
   return (
      <NearProvider authContractId='my-contract.testnet'>
         <Component {...pageProps} />
      </NearProvider>
   );
}
function Page() {
   const near = useNear();
   const nearUser = useNearUser();
   const nearAccount = useNearAccount(nearUser.address);

   return (
      <>
         <span>User Address: {account.address}</span>
         <span>Balance: {nearAccount?.balance} NEAR</span>
      </>
   );
}

NearEnvironmentProvider

The state of ENV will be saved in a cookie

// app.tsx
function MyApp({ Component, pageProps }: AppProps) {
   return (
      <NearEnvironmentProvider defaultEnvironment={NearEnvironment.TestNet}>
         <Component {...pageProps} />
      </NearEnvironmentProvider>
   );
}
function Page() {
   const nearEnv = useNearEnv();

   const handleChangeEnv = () => nearEnv.update(NearEnvironment.TestNet);

   return (
      <>
         <span>Current Env: {nearEnv.value}</span>
         <button onClick={handleChangeEnv}>switch to testnet</button>
      </>
   );
}

useNearUser

Everything you need to manage your account

function Page() {
   const nearUser = useNearUser();

   return (
      <>
         <button onClick={() => nearUser.connect()}>Connect wallet</button>
         <button onClick={() => nearUser.disconnect()}>Disconnect wallet</button>

         <span>Is Connected: {nearUser.isConnected}</span>
         <span>Address: {nearUser.address}</span>
      </>
   );
}

Batch transactions

For example, if you need to transfer 2 coins into a liquidity pool in single call

const MT_CONTRACT_ID = 'mt-token.testnet';
const FT_CONTRACT_ID_1 = 'ft-token-one.testnet';
const FT_CONTRACT_ID_2 = 'ft-token-two.testnet';
const POOL_CONTRACT_ID = 'two-tokens-receiver.testnet';

function Page() {
   const nearUser = useNearUser();

   const [ftTransferCall1, ftTransferCallCtx1] = useFtTransferCall({
      contract: 'mfight-ft.testnet',
      gas: GAS_FOR_FT_TRANSFER_CALL,
   });
   const [ftTransferCall2, ftTransferCallCtx2] = useFtTransferCall({
      contract: 'mfight-ft.testnet',
      gas: GAS_FOR_FT_TRANSFER_CALL,
   });
   const [mtBatchTransferCall, mtTransferCallCtx] = useMtBatchTransferCall({
      contract: 'mfight-ft.testnet',
      gas: GAS_FOR_MT_TRANSFER_CALL,
   });

   const handleTransfer = async () => {
      const amount1 = parseNearAmount('1') as string;
      const amount2 = parseNearAmount('1') as string;

      return nearUser.signAndSendTransactions({
         transactions: [
            {
               signerId: nearUser.address as string,
               receiverId: MT_CONTRACT_ID,
               actions: [
                  {
                     type: 'FunctionCall',
                     params: {
                        methodName: 'ft_transfer',
                        args: btoa(JSON.stringify({ receiver_id: 'xx', amount: '1' })),
                        gas: 'xxx',
                        deposit: '1',
                     },
                  },
               ],
            },
         ],
      });
   };

   return (
      <>
         <button onClick={handleTransfer}>Batch Transactions</button>
      </>
   );
}

useNearQuery

Calling the view method from the contract

function Page() {
   const nearUser = useNearUser();

   const {
      data: balance = '0', // method result
      loading, // waiting for result or error
      error, // error, if exists
      refetch, // refresh state
   } = useNearQuery<string, { account_id: string }>('ft_balance_of', {
      contract: 'mfight-ft.testnte', // contract of method
      variables: {
         account_id: 'account.near',
      }, // arguments of method
      poolInterval: 1000 * 60, // refresh state with interval
      skip: !nearUser.isConnected, // method will not be called
      debug: true, // debug method, print info to console
      onError: (err) => console.log(err), // error handler
      onCompleted: (res) => console.log(res), // result handler
   });

   return (
      <>
         <span>Balance: {formatNearAmount(balance)}</span>
         {loading && <span>Loading...</span>}
         {error && <span>Error: {error}</span>}
         <button onClick={() => refetch({}).catch(console.log)}>Force Refresh</button>
      </>
   );
}

useNearMutation

Calling the change method from the contract

function Page() {
   const nearUser = useNearUser();

   const [transfer, { loading, data }] = useNearMutation<
      string,
      { receiver_id: string; amount: string }
   >('ft_transfer', {
      gas: NEAR_GAS, // gas for this method
      contract: 'mfight-ft.testnet',
      debug: true, // debug method, print info to console
      onError: (err) => console.log(err), // error handler
      onCompleted: (res) => console.log(res), // result handler
   });

   return (
      <>
         <span>Result: {data}</span>
         {loading && <span>Loading...</span>}
         <button
            onClick={() =>
               transfer(
                  { amount: parseNearAmount('10'), receiver_id: 'account.near' },
                  parseNearAmount('0.01') as string,
               ).catch(console.log)
            }
         >
            Tranfer
         </button>
      </>
   );
}

useNearStatus

Get result transactions hashes if method is success, or get error if failure

function Page() {
   const { transactionHashes, error } = useNearStatus();

   return (
      <>
         {transactionHashes && <span>Success Tx List: {transactionHashes}</span>}
         {error && <span>{error}</span>}
      </>
   );
}

Contracts

NFT

• [x] nft_metadata
• [x] nft_token
• [x] nft_transfer
• [x] nft_transfer_call
• [x] nft_tokens
• [x] nft_tokens_for_owner
• [x] nft_total_supply
• [x] nft_supply_for_owner
• [x] nft_is_approved
• [x] nft_approve
• [x] nft_revoke
• [x] nft_revoke_all
• [x] nft_payout
• [x] nft_transfer_payout

FT

• [x] ft_metadata
• [x] ft_transfer
• [x] ft_transfer_call
• [x] ft_balance_of
• [x] ft_total_supply

MT

• [x] mt_balance_of
• [x] mt_total_supply
• [x] mt_batch_transfer
• [x] mt_batch_transfer_call

Storage

• [x] storage_balance_of
• [x] storage_balance_bounds
• [x] storage_deposit
• [x] storage_withdraw
• [x] storage_unregister

Paras

• [x] nft_approve (useParasNftApprove)
• [x] get_market_data (useParasMarketData)
• [x] api collection-stats (useParasCollectionStats)

Ref Finance

• [x] get_pool (useRefFinancePool)

Utils

• [x] parseNearAmount with decimals
• [x] isValidNearAddress
• [x] parseNearDate
• [x] formatNearAddress
• [x] gas and more :)

Authors

• Maksim Schiriy @maksim-schiriy