CODEWITHSUNDEEP
solidity
doctopus
doctopus

Reputation: 5657

How to solve declaration error due to repeated imports?

Let's say I have contract Parent.sol which has two imports:

import "./interfaces/IPair.sol";
import "./interfaces/IMasterChef.sol";

And both interfaces individually import IERC20.sol.

Well when I compile Parent.sol, I'll get declaration error due to repeateded import of IERC20.sol:

contracts/Parent.sol:7:1: DeclarationError: Identifier already declared.
import "./interfaces/IMasterChef.sol";
^------------------------------------^
contracts/interfaces/IERC20.sol:4:1: The previous declaration is here:
interface IERC20 {
^ (Relevant source part starts here and spans across multiple lines).

Error HH600: Compilation failed

Is there any way of solving this without flattening the file?

Upvotes: 0

Views: 521

Answers (1)

Petr Hejda
Petr Hejda

Reputation: 43521

There's currently no namespacing or import X as Y, that would allow to use both interfaces with the same name.

If you don't want to merge the files, you can keep both but need to change the actual interface name of at least one them.

Example:

  • ./interfaces/IPair.sol imports ./Pair/IERC20.sol, which defines interface IERC20 {}

    • change the definition to interface IPairERC20 {} and all occurrences that instantiate it (new IERC20() to new IPairERC20())

  • ./interfaces/IMasterChef.sol imports ./MasterChef/IERC20.sol, which defines interface IERC20 {}

    • change the definition to interface IMasterChefERC20 {} and all occurrences that instantiate it (new IERC20() to new IMasterChefERC20())

Upvotes: 1

Related Questions