I’m trying to compile a smart contract TestMinter.sol that inherits from ERC20PresetMinterPauser.sol using the @openzeppelin/contracts library and Truffle. TestMinter.sol seems to import the ERC20PresetMinterPauser.sol correctly using import "node_modules/@openzeppelin/contracts/presets/ERC20Preset…

I am not sure, but I think if you have installed the package, you can use as following: pragma solidity ^0.5.0; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20Detailed.sol"; contract SimpleToken is Context, ERC20, ERC20Detailed { const…

Hi @Lennard_Mulder , Welcome to the community :wave: Can you try changing your imports to what @Skyge suggested?

Hi @Skyge & @abcoathup , removing node_modules/ from the import solved the problem, thanks! I’m using a truffle+react box which means I have another node_modules/ dir in the client dir. Could this have been the issue?

Sorry, I am not familiar with the React, I think it is ok if you have two node_modules, but your folders may be like this: --contracts --YourContract.sol --node_modules <<-- OpenZeppelin dependency should be at here --client --src --node_modules If I am wrong, please correct me.

Hi @Skyge , Absolutely right. Nice text diagram too. Thanks as always :pray:

Hi @abcoathup , Hope you are well. I'm facing the same issue. When i deploy contracts, all imports work fine but i'm trying to generate the bytecode and ABI using solc package but in this way my import files are not working. I've tried in both ways by defining path of node_modules and with definin…

Fixed by setting up --base-path in solc and defining import URLs to ../node_modules/@openzeppelin

Why not import "@openzeppelin/contracts/token/ERC721/ERC721.sol"? I'd strongly recommend to follow @Skyge 's advice and not import from npm packages using paths starting with ../node_modules/. I think it will not even work in latest Truffle now that imports from absolute locations are disallowed (se…

Solc is not able to pick inherited contracts from the write path. That's why i have to set the base path and then update the inherited contracts path.

Can you describe it in more detail? Maybe post a small code snippet that does not compile for you (along with paths you're using)? If it's broken, I'd like to get it fixed in the compiler. And if it's not, I can explain why it does not work and how to use it properly. I mean, I'd understand if impo…

@cameel That was just for the example. I just want to show that in both cases i'm unable to access file but i gets solved by defining the basepath in solc solcjs --bin --optimize --base-path /media/junaid/Codes/Other/nft-smartContracts/ contracts/NFTProject.sol

"File import callback not supported" on Truffle using Linux

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"File import callback not supported" on Truffle using Linux

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