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.

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