Hi there, thanks for this plugin!

Would be great to have the option to export only some functions and events to have lighter ABIs...
Is this feature would makes sense on this plugin? What do you recommend to implement it?
It'd be happy to contribute on this one.

Best regards,
Luca

Hi, I am getting this ABI output from running yarn run hardhat export-abi. It does not look like a valid contract ABI format.

[
  "constructor(string,string,uint256)",
  "event Approval(address indexed,address indexed,uint256)",
  "event Transfer(address indexed,address indexed,uint256)",
  "function allowance(address,address) view returns (uint256)",
  "function approve(address,uint256) returns (bool)",
  "function balanceOf(address) view returns (uint256)",
  "function decimals() view returns (uint8)",
  "function decreaseAllowance(address,uint256) returns (bool)",
  "function increaseAllowance(address,uint256) returns (bool)",
  "function name() view returns (string)",
  "function symbol() view returns (string)",
  "function totalSupply() view returns (uint256)",
  "function transfer(address,uint256) returns (bool)",
  "function transferFrom(address,address,uint256) returns (bool)"
]

contract

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract ERC20Contract is ERC20 {
    constructor(
        string memory name,
        string memory symbol,
        uint256 supply
    ) public ERC20(name, symbol) {
        _mint(msg.sender, supply);
    }
}

packages

"hardhat": "2.2.1",
"hardhat-abi-exporter": "^2.6.1",

node version

node --version 
v16.13.0

getting this error when having
require('hardhat-abi-exporter');

release notes: https://github.com/nomiclabs/hardhat/releases/tag/hardhat-v2.0.0
migration guide: https://github.com/nomiclabs/hardhat-ts-plugin-boilerplate/blob/master/MIGRATION.md

Hello, author! I have a suggestion: Maybe, the plugin could be added a function: export .bin file, Why?

Becouse .abi + .bin could generate .go/.java/.objc abi-object-file by abigen(thus hardhat-abi-exporter plugin will be more useful, not only for ethers or web3js), eg:

[^ plus]: .bin file content is bytecode without 0x in raw Oracle.json, like this:

{
  // ...
  "bytecode": "0x60806040523480156200001157600080fd5b5060405162001ac638038062001...",
  "deployedBytecode": "0x608060405234801561001057600080fd5b50600436106100a9576000...",
  "linkReferences": {},
  "deployedLinkReferences": {}
}

                                          ↓↓↓↓

60806040523480156200001157600080fd5b50604051620031d3380380620031d383398181016040528101...

( :: output File name suffix is not important, it's up to you, but maybe .bin for bytecode and .abi for abi are more accurate)
'

'

'
abigen target file like this:

abigen --bin Oracle.bin --abi Oracle.abi --pkg oracle -o oracle.go

// Code generated - DO NOT EDIT.
// This file is a generated binding and any manual changes will be lost.

package oracle

import (
	"errors"
	"math/big"
	"strings"

	ethereum "github.com/ethereum/go-ethereum"
	"github.com/ethereum/go-ethereum/accounts/abi"
	"github.com/ethereum/go-ethereum/accounts/abi/bind"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/event"
)

// Reference imports to suppress errors if they are not otherwise used.
var (
	_ = errors.New
	_ = big.NewInt
	_ = strings.NewReader
	_ = ethereum.NotFound
	_ = bind.Bind
	_ = common.Big1
	_ = types.BloomLookup
	_ = event.NewSubscription
)

// OracleMetaData contains all meta data concerning the Oracle contract.
var OracleMetaData = &bind.MetaData{
	ABI: "[{\"inputs\":[],\"name\":\"ETH\",\"outputs\":...",
}

// OracleABI is the input ABI used to generate the binding from.
// Deprecated: Use OracleMetaData.ABI instead.
var OracleABI = OracleMetaData.ABI

// Oracle is an auto generated Go binding around an Ethereum contract.
type Oracle struct {
	OracleCaller     // Read-only binding to the contract
	OracleTransactor // Write-only binding to the contract
	OracleFilterer   // Log filterer for contract events
}
// has more...

salute!

The hardhat-coverage plugin modifies contract code, and also the associated ABIs. ABI export should be disabled when this plugin is in use.

See also: ItsNickBarry/hardhat-contract-sizer#8

Thanks for this tool, it's super helpful. One feature I wish it supported is passing in a regex pattern and/or specifying specific subfolders to exclude in the except array.

For example if I had a file structure like:
contracts
L interfaces
..L IERC20.sol
..L IERC721.sol
MyContract.sol
OtherContract.sol

It would be great if I had a way to exclude all of the contracts in the interfaces directory without specifying each of the files individually. Would you consider adding support for this feature?

I am trying to deploy a contract, and each version has the same error message, deleting the ABI folder does nothing, deleting all cache folders and other compile time folders also doesn't work.

Error in plugin hardhat-abi-exporter: duplicate output destination: /Users/computer/folder/testCoin-4/abis/Ownable.json

I have tried running clear & also trying a fresh install. I have also changed folder names, and moved their destination, starting from a fresh starter also doesn't help.

abiExporter: { path: "./abis", runOnCompile: true, clear: true, flat: true, only: [], spacing: 2, pretty: true, },

Hi, I was wondering would it be possible to also have a flag to also generate files with bytecode for the contract? From what I understand they already exist in the artifacts.

Such a feature would save some time when generating abi files to be used in for example bindings for golang

I would expect the hardhat clean command to remove the generated abis, the same way that typechain hooks into the clean command and removes the code that it generates. Would be helpful when you've borked something and want to confirm that the state is fresh.

When there are files in the output directory the plugin fails, even though I have clear set to true in config.

Full error:

{ Error: ENOTEMPTY: directory not empty, rmdir '/Users/solar/dev/eth/tug-of-war/solidity/../dapp/src/abi'
    at Object.rmdirSync (fs.js:684:3)
    at OverriddenTaskDefinition._action (/Users/solar/dev/eth/tug-of-war/solidity/node_modules/hardhat-abi-exporter/index.js:31:8)
  errno: -66,
  syscall: 'rmdir',
  code: 'ENOTEMPTY',
  path: '/Users/solar/dev/eth/tug-of-war/solidity/../dapp/src/abi' }

Hi! 👋

Firstly, thanks for your work on this project! 🙂

Today I used patch-package to patch [email protected] for the project I'm working on.

Here is the diff that solved my problem:

diff --git a/node_modules/hardhat-abi-exporter/index.d.ts b/node_modules/hardhat-abi-exporter/index.d.ts
index 7b44cdf..baeb105 100644
--- a/node_modules/hardhat-abi-exporter/index.d.ts
+++ b/node_modules/hardhat-abi-exporter/index.d.ts
@@ -12,6 +12,8 @@ interface AbiExporterUserConfig {
   format?: string,
   filter?: (abiElement: any, index: number, abi: any, fullyQualifiedName: string) => boolean,
   rename?: (sourceName: string, contractName: string) => string,
+  fileExtension?: '.json' | '.ts',
+  renameABI?: (name: string) => string,
 }
 
 declare module 'hardhat/types/config' {
@@ -32,6 +34,8 @@ declare module 'hardhat/types/config' {
       format?: string,
       filter: (abiElement: any, index: number, abi: any, fullyQualifiedName: string) => boolean,
       rename: (sourceName: string, contractName: string) => string,
+      fileExtension?: '.json' | '.ts',
+      renameABI?: (name: string) => string,
     }[]
   }
 }
diff --git a/node_modules/hardhat-abi-exporter/tasks/export_abi.js b/node_modules/hardhat-abi-exporter/tasks/export_abi.js
index d0c6ccd..9fdaa4c 100644
--- a/node_modules/hardhat-abi-exporter/tasks/export_abi.js
+++ b/node_modules/hardhat-abi-exporter/tasks/export_abi.js
@@ -61,9 +61,9 @@ subtask(
     const destination = path.resolve(
       outputDirectory,
       config.rename(sourceName, contractName)
-    ) + '.json';
+    ) + config.fileExtension || '.json';
 
-    outputData.push({ abi, destination });
+    outputData.push({ abi, destination, contractName });
   }));
 
   outputData.reduce(function (acc, { destination }) {
@@ -79,8 +79,15 @@ subtask(
     await hre.run('clear-abi-group', { path: config.path });
   }
 
-  await Promise.all(outputData.map(async function ({ abi, destination }) {
+  await Promise.all(outputData.map(async function ({ abi, destination, contractName }) {
     await fs.promises.mkdir(path.dirname(destination), { recursive: true });
-    await fs.promises.writeFile(destination, `${JSON.stringify(abi, null, config.spacing)}\n`, { flag: 'w' });
+    let fileContent = '';
+    if (config.fileExtension === '.ts') {
+      const name = config.renameABI ? config.renameABI(contractName) : `ABI_${contractName}`;
+      fileContent = `const ${name} = ${JSON.stringify(abi, null, config.spacing)} as const;\nexport default ${name};\n`;
+    } else {
+      fileContent = `${JSON.stringify(abi, null, config.spacing)}\n`;
+    }
+    await fs.promises.writeFile(destination, fileContent, { flag: 'w' });
   }));
 });

This issue body was partially generated by patch-package.

Hi
Thanks for such a great library!
I was wondering if there would be a feature to put all flattened ABIs into one file.
reasons:

1. currently events and errors are not getting into ABI if they are imported from a library; so we can combine all ABIs to cover all events and errors.
2. If you are using the Diamond EIP, it is really helpful to use one ABI for all the facets.

This line throws when I compile a combination of Uniswap v3 core and periphery contract libraries. I get:

Error in plugin hardhat-abi-exporter: duplicate output destination: .../uniswap/v3-core/abi/IUniswapV3Factory.json

when compiling, despite there only being one interface in the whole repo named IUniswapV3Factory.

Disabling this line throws no error.

Perhaps the error is unnecessary since a set is used anyway, so duplicate abi's will just be ignored anyway? or perhaps the abi's should be diffed instead (e.g. using lodash.isEqual) and if the diff does not match, then the error thrown.

The description explicitly mentions solidity but isn't ABI generation only dependent on the bytecode?
Will it work for vyper too?

If validations are done in extendConfig, errors will be thrown at startup rather than when the export-abi task is run.

Seeing this warning on the latest LTS version of node (16.13.0):

(node:21035) [DEP0147] DeprecationWarning: In future versions of Node.js, fs.rmdir(path, { recursive: true }) will be removed. Use fs.rm(path, { recursive: true }) instead

Should be a small fix. If possible!