This is a fork of the original project developed by the Crypto-Punkers team, re-released by OpenZeppelin with additional fixes.

Single API for resolving Solidity artefacts and imports

Example usage

We provide a pre-built complete engine with sane defaults. Resolver-engine is a common importing interface for all the Ethereum inventions out there.

import { ImportFsEngine } from "@openzeppelin/resolver-engine-import-fs";

ImportFsEngine()
  .require("github:OpenZeppelin/openzeppelin-solidity/contracts/ownership/Ownable.sol#v2.1.2")
  .then(file => console.log(`Loaded url ${file.url} with source: ${file.source}`);

Otherwise, you can build your own engines, suited to your needs.

import { ResolverEngine } from "@openzeppelin/resolver-engine-core";
import { parsers, resolvers } from "@openzeppelin/resolver-engine-imports-fs";

const resolver = new ResolverEngine<string>()
  .addResolver(resolvers.FsResolver())
  .addResolver(resolvers.NodeResolver())
  .addParser(parsers.FsParser());

resolver
  .resolve("@openzeppelin-solidity/contracts/ownership/Ownable.sol")
  .then(fileSource => console.log(fileSource))
  .catch(console.error);

import { parsers, resolvers, ResolverEngine } from "@openzeppelin/resolver-engine-core";

const resolver = new ResolverEngine<string>().addResolver(resolvers.UriResolver()).addParser(parsers.UrlParser());

resolver.resolve("https://pastebin.com/raw/D8ziKX0a").then(console.log);

In the examples/ folder more granular examples can be found.

Published packages

Package	NPM	Description
@openzeppelin/resolver-engine-imports-fs		Solidity imports with filesystem support
@openzeppelin/resolver-engine-imports		Browser-friendly version of Solidity imports
@openzeppelin/resolver-engine-core		Core of the project consisting of the engine and interfaces
@openzeppelin/resolver-engine-fs		Filesystem abstractions, basis for future artifacts resolver and many others

Long description

Each Solidity framework has different logic concerning Solidity import statements as well as creating different format of artifacts. This becomes problematic when target developers want to use multiple tools on the same codebase.

For example, Truffle artifacts are not compatible with 0xProject's solidity coverage tooling. Documentation generation doesn't support NPM-like Solidity imports which are supported by both Truffle and 0x, at the same time, neither of which support github import statements as the ones Remix does.

The goal of this library is to provide tooling for framework developers so that they can implement multiple artifacts and solidity importing with ease, as well as providing sane defaults that would standarize the functionallity.