Import

Você pode importar arquivos locais e externos no Solidity.

Local

Aqui está nossa estrutura da pasta.

├── Import.sol
└── Foo.sol

Foo.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

struct Point {
    uint x;
    uint y;
}

error Unauthorized(address caller);

function add(uint x, uint y) pure returns (uint) {
    return x + y;
}

contract Foo {
    string public name = "Foo";
}

Import.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

// importa Foo.sol do diretório atual
import "./Foo.sol";

// import {symbol1 as alias, symbol2} from "filename";
import {Unauthorized, add as func, Point} from "./Foo.sol";

contract Import {
    // Inicializa Foo.sol
    Foo public foo = new Foo();

    // Testa Foo.sol obtendo seu nome.
    function getFooName() public view returns (string memory) {
        return foo.name();
    }
}

External

Você também pode importar de GitHub (opens new window) simplesmente copiando o url

// https://github.com/owner/repo/blob/branch/path/to/Contract.sol
import "https://github.com/owner/repo/blob/branch/path/to/Contract.sol";

// Example import ECDSA.sol from openzeppelin-contract repo, release-v3.3 branch
// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/release-v3.3/contracts/cryptography/ECDSA.sol
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/release-v3.3/contracts/cryptography/ECDSA.sol";

Teste no Remix

• Foo.sol (opens new window)
• Import.sol (opens new window)