Hardhat ABI Exporter

Export Ethereum smart contract ABIs on compilation via Hardhat.

Versions of this plugin prior to 2.0.0 were released as buidler-abi-exporter.

Installation

npm install --save-dev hardhat-abi-exporter
# or
yarn add --dev hardhat-abi-exporter

Usage

Load plugin in Hardhat config:

require('hardhat-abi-exporter');

Add configuration under the abiExporter key:

option	description	default
path	path to ABI export directory (relative to Hardhat root)	'./abi'
runOnCompile	whether to automatically export ABIs during compilation	false
clear	whether to delete old ABI files in path on compilation	false
flat	whether to flatten output directory (may cause name collisions)	false
only	Array of String matchers used to select included contracts, defaults to all contracts if length is 0	[]
except	Array of String matchers used to exclude contracts	[]
spacing	number of spaces per indentation level of formatted output	2
pretty	whether to use interface-style formatting of output for better readability	false
format	format type ("json", "minimal", "fullName"). Alternative to pretty	json
filter	Function with signature (abiElement: any, index: number, abi: any, fullyQualifiedName: string) => boolean used to filter elements from each exported ABI	() => true
rename	Function with signature (sourceName: string, contractName: string) => string used to rename an exported ABI (incompatible with flat option)	undefined

Note that the configuration formatted as either a single Object, or an Array of objects. An Array may be used to specify multiple outputs.

abiExporter: {
  path: './data/abi',
  runOnCompile: true,
  clear: true,
  flat: true,
  only: [':ERC20$'],
  spacing: 2,
  pretty: true,
  format: "minimal",
}

// or

abiExporter: [
  {
    path: './abi/pretty',
    pretty: true,
  },
  {
    path: './abi/ugly',
    pretty: false,
  },
]

// or

abiExporter: [
  {
    path: './abi/json',
    format: "json",
  },
  {
    path: './abi/minimal',
    format: "minimal",
  },
  {
    path: './abi/fullName',
    format: "fullName",
  },
]

The included Hardhat tasks may be run manually:

npx hardhat export-abi
npx hardhat clear-abi
# or
yarn run hardhat export-abi
yarn run hardhat clear-abi

By default, the hardhat compile task is run before exporting ABIs. This behavior can be disabled with the --no-compile flag:

npx hardhat export-abi --no-compile
# or
yarn run hardhat export-abi --no-compile

The path directory will be created if it does not exist.

The clear option is set to false by default because it represents a destructive action, but should be set to true in most cases.

ABIs files are saved in the format [CONTRACT_NAME].json.

Development

Install dependencies via Yarn:

yarn install

Setup Husky to format code on commit:

yarn prepare