interfaces

@graphprotocol/interfaces

Contract interfaces and types for The Graph protocol.

Overview

This package contains contract interfaces and types used in dependent packages.

Installation

pnpm add @graphprotocol/interfaces

Compiler Version Strategy

Interface pragma statements use open-ended caret ranges (e.g., ^0.8.22) rather than exact versions to maximize compatibility with future packages and compiler versions:

• Dual-version interfaces (^0.7.6 || ^0.8.0 or ^0.7.3 || ^0.8.0): Maintain compatibility with both Solidity 0.7.x and 0.8.x implementations
• Modern interfaces (^0.8.22): Allow the use of Solidity 0.8-specific features like custom errors, named mapping parameters, and file-level events

This approach allows consuming projects to use any compatible compiler version within the specified range.

Usage

Contract interfaces

Solidity contract interfaces can be imported from @graphprotocol/interfaces/contracts/...:

pragma solidity 0.8.27;

import { IGraphPayments } from "@graphprotocol/interfaces/contracts/horizon/IGraphPayments.sol";

contract GraphPayments is IGraphPayments {
    ...
}

Note that contracts in the toolshed/ directory are not meant to be imported by Solidity code, they only exist to generate complete TypeScript types.

TypeScript types

This package provides types generated with Typechain compatible with ethers v6. To use them import with:

import {
  GraphPayments,
  GraphTallyCollector,
  HorizonStaking,
  L2GraphToken,
  PaymentsEscrow,
  SubgraphService,
} from '@graphprotocol/interfaces'

Available Type Formats

This package generates TypeScript types in multiple formats to support different environments:

• ethers v6 (default): dist/types/ - Modern ethers.js types (imported from package root)
• ethers v5: dist/types-v5/ - Legacy ethers.js support for projects still using ethers v5
• Wagmi: dist/wagmi/ - React hooks for the wagmi library

Import the appropriate version based on your project's dependencies.

TypeScript library

Additionally, the package exposes a few helper functions to facilitate the creation of fully typed ethers v6 contracts:

Function Name	Description
getInterface	Retrieves the contract interface for a given contract name.
getMergedInterface	Loads and merges interfaces from multiple contract names.
getAbi	Gets the ABI for a given contract name.

import { getInterface, SubgraphService } from '@graphprotocol/interfaces'

const subgraphService = new ethers.Contract('0x12...90', getInterface('SubgraphService')) as SubgraphService