vscode-solidity: Source "@openzeppelin/contracts...." not found: File import callback not supported

Hi all,

I need some help trying to make this extension work with the @openzeppelin/contracts NPM package. I know issues like this have been raised in the past, but I tried a lot of things and I still keep getting the same error (or similar). Here’s what I do to initialize a simple Solidity project:

mkdir ack && cd ack truffle init truffle create all DeedRepository npm init -y npm install @openzeppelin/contracts

Then I open VS Code and edit my DeedRepository contract like this,

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.7;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract DeedRepository is ERC721 {
  constructor(string memory _name, string memory _symbol) ERC721(_name, _symbol) {}
}

Here’s a picture where you can see both the directory structure and the code side-by-side:

And the ERC721.sol contract is in there as well

The original error

Even before trying to compile this contract, I already have an error and a warning from the extension:

Btw, these are my default settings. I see no mention of Solidity in there at first,

So I go ahead anyway and try to compile the contract by right-clicking on the screen and selecting “Solidity: Compile Contract”. This is the compiler output:

1st solution

I read on the Project Structure and Remappings section of the README that I should add a couple of settings. I add them so that the settings file looks like this:

Second error

Then I try to compile the contract again the same way as before, by right-clicking on the screen and selecting “Solidity: Compile Contract”. I get a slightly different output this time, but still no luck:

Keep in mind that the full path underlined in red on the image above actually exists on my PC.

Compiling the code through solc

I thought this might be a configuration issue with the extension itself, so I tried to compile the contract by calling solc directly

Reading solc docs, I see that there are a couple of arguments that I can set to tell the compiler where to look for dependencies. So I call it again and pass those arguments. It works:

Conclusion

I’m guessing that the values for the following settings

“solidity.packageDefaultDependenciesContractsDirectory”: “”, “solidity.packageDefaultDependenciesDirectory”: “node_modules”

eventually make their way into compiler arguments, but I can’t seem to find the appropriate values. Could someone please help me find the correct values given my project structure?

PS, compiling through the extension works if given a relative path

I really would like to make it work with the following import syntax, though

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";