How to get a function's ABI ?

[sshmaxime]

How to get the ABI of one of my contract's function ?

[ricmoo]

You can use the format method on the Fragment, from the Interface. There are several output formats to choose from depending on how verbose you want the signature to be:

// Most useful; includes all function names, return types, visibility, etc.
contract.interface.getFunction("transfer").format(ethers.utils.FormatTypes.full)
// 'function transfer(address to, uint256 value)'

// If you need to operate against other tools that do not support human-readable ABI
contract.interface.getFunction("transfer").format(ethers.utils.FormatTypes.json)
// '{"type":"function","name":"transfer","constant":false,"payble":false,"inputs":[{"type":"address","name":"to"},{"type":"uint256","name":"value"}],"ouputs":[]}'

// Similar to "full", but is slightly more compact and drops names.
contract.interface.getFunction("transfer").format(ethers.utils.FormatTypes.minimal)
// 'function transfer(address,uint256)'

// This is useful for computing the normalized signatures for computing selectors, but is not sufficient to store to re-create the ABI
contract.interface.getFunction("transfer").format(ethers.utils.FormatTypes.sighash)
// 'transfer(address,uint256)'

Is that what you were looking for?

[sshmaxime]

So it answer partly to my question, thx for that !

But how can I do that: myContract.methods.myMethod([param1[, param2[, ...]]]).encodeABI(), precisely as describe here (with params as well)

[zemse]

If you are looking for populateTransaction (docs).

const unsignedTx = myContract.populateTransaction.myMethod(arg1, arg2, arg3);

unsignedTx.data // encoded input data