Building Blockchain Projects

Using contracts of packages within your contracts

To use a package's contracts within your contracts, it can be as simple as Solidity's import statement. When your import path isn't explicitly relative or absolute, it signifies to truffle that you're looking for a file from a specific named package. Consider this example using the example-truffle-library (https://github.com/ConsenSys/example-truffle-library):

import "example-truffle-library/contracts/SimpleNameRegistry.sol";

Since the path didn't start with ./, truffle knows to look in your project's node_modules or installed_contracts directory for the example-truffle-library folder. From there, it resolves the path to provide you with the contract you requested.