Deposit some _amount in ERC20 _token ( USDC, DAI, etc )

deposit.js

// get web3
let web3 = await initAccount()

// get contract instance
let main = new web3.eth.Contract(
  JSON_ABI,
  CONTRACT_ADDRESS,
)

// usdc contract instance
let usdcContract = new web3.eth.Contract(
  erc20Abi,
  USDC_TOKEN_CONTRACT_ADDRESS,
)

// dai contract instance
let daiContract = new web3.eth.Contract(
  erc20Abi,
  DAI_TOKEN_CONTRACT_ADDRESS,
)

// approve
try {
  if (tokenType === 'USDC') {
    await usdcContract.methods
      .approve(
        CONTRACT_ADDRESS,
        web3.utils.toWei(amount.toString(), 'mwei'),
      )
      .send({ from: address })
      .on('receipt', function (receipt) {
        console.log({ receipt })
      })
  } else if (tokenType === 'DAI') {
    await daiContract.methods
      .approve(
        CONTRACT_ADDRESS,
        web3.utils.toWei(amount.toString()),
      )
      .send({ from: address })
      .on('receipt', function (receipt) {
        console.log({ receipt })
      })
  }
} catch (error) {
  throw error
}

// deposit
await main.methods
  .deposit(
    web3.utils.toWei(
      amount.toString(),
      tokenType === 'USDC' ? 'mwei' : 'ether',
    ),
    tokenType === 'USDC'
      ? USDC_TOKEN_CONTRACT_ADDRESS
      : DAI_TOKEN_CONTRACT_ADDRESS,
  )
  .send({ from: address })
  .on('transactionHash', function (hash) {
    console.log({ hash })
  })
  .on('receipt', function (receipt) {
    console.log({ receipt })
  })
  .on('error', function (error) {
    throw error
  })

deposit.sol

function deposit(uint256 _amount, address _token) external onlyInitialized {
    require(
        _token == tokens[0] || _token == tokens[1] || _token == tokens[2],
        "token not accepted"
    );
    require(
        IERC20(_token).transferFrom(msg.sender, address(this), _amount),
        "Transfer from failed"
    );
    balances[msg.sender][_token] = balances[msg.sender][_token].add(
        _amount
    );
    emit Deposit(msg.sender, _amount);
}