Calling near contracts from Node.js

gistfile1.txt

import { Account } from "@near-js/accounts";
import { actionCreators } from "@near-js/transactions";
import { JsonRpcProvider } from "@near-js/providers";
import { KeyPairSigner } from "@near-js/signers";
import { NEAR } from "@near-js/tokens";
import { USDC } from "@near-js/tokens/testnet";
import * as dotenv from "dotenv"
dotenv.config()


const signer = KeyPairSigner.fromSecretKey(process.env.SENDER_PRIVATE_KEY)
const provider = new JsonRpcProvider({
    url: process.env.TESTNET_RPC_URL
})
const accountId = process.env.SENDER
const account = new Account(accountId, provider, signer)

const nearAmount = await account.getBalance(NEAR)
const nearAmountDecimal = NEAR.toDecimal(nearAmount)

const usdcAmount = await account.getBalance(USDC)
const usdcAmountDecimal = USDC.toDecimal(usdcAmount)

console.log(`NEAR balance of ${accountId}: ${nearAmountDecimal}`)
console.log(`USDC balance of ${accountId}: ${usdcAmountDecimal}`)

// Calling contract from 'hello_near' project

const CONTRACT_ID = "nk-contract-a.testnet"
const METHOD_NAME = "get_balance"
const METHOD_ARGS = { key: "nk-deployer.testnet" }

const result = await provider.callFunction(
    CONTRACT_ID,
    METHOD_NAME,
    METHOD_ARGS
)

console.log(JSON.stringify(result, null, 2))

// Call deposit() on hello_near contract
// 
// This approach succeeds at the function call, but it doesn't
// return the tx hash or receipt information. In order to get it, 
// see below with signAndSendTransaction 

const depositResult = await account.callFunction({
    contractId: CONTRACT_ID,
    methodName: "deposit",
    args: { amt: "100000000" },
    deposit: NEAR.toUnits(0.06), // 0.06 NEAR
    gas: "30000000000000" // 30 TGas
})

console.log(`depositResult:`)
console.log({ depositResult })

// provider.signAndSendTransaction approach
//

const outcome = await account.signAndSendTransaction({
    receiverId: CONTRACT_ID,
    actions: [
        actionCreators.functionCall(
            "deposit",
            { amt: "100000000" },
            "30000000000000",  // gas
            NEAR.toUnits(0.06)  // deposit in yoctoNEAR
        ),
        actionCreators.functionCall(
            "deposit",
            { amt: "100000000" },
            "30000000000000",  // gas
            NEAR.toUnits(0.07)  // deposit in yoctoNEAR
        ),
    ],
});

console.log("Transaction outcome:")
console.log(JSON.stringify(outcome, null, 2)) // dumps all action outcomes
console.log("Tx Hash:")
console.log(JSON.stringify(outcome.transaction_outcome.id))