How to web3 "encodeFunctionCall" a payable function?

Question

I want to encode a call for mint() payable with a msg.value of 8 ETH.

My code:

web3.eth.abi.encodeFunctionCall({
    type: 'function',
    name: 'mint',
    payable: true,
    value: web3.utils.toWei("8", "ether")
}, [])

I get TypeError: Cannot read property 'forEach' of undefined

Help?

Answer 1

You are missing the inputs field as per the documentation.

So, assuming no parameters :

web3.eth.abi.encodeFunctionCall({
    type: 'function',
    name: 'mint',
    payable: true,
    inputs: [],
    value: web3.utils.toWei("8", "ether")
}, [])
// returns: 0x1249c58b

You can omit the fields : payable and value they are irrelevant to generate the abi encoded function call. So :

web3.eth.abi.encodeFunctionCall({
    type: 'function',
    name: 'mint',
    inputs: [],
}, [])
// returns: 0x1249c58b

Without parameters, this is exactly the same as:

web3.eth.abi.encodeFunctionSignature("mint()")
// returns: 0x1249c58b