javascript - 如何使用 solc 0.5 编译 Solidity

Question

编译.js:

const path = require('path');
const solc = require('solc');
const fs = require('fs-extra');

const buildPath = path.resolve(__dirname, 'build');
fs.removeSync(buildPath);

const campaignPath = path.resolve(__dirname, 'contracts', 'Campaign.sol');
const source = fs.readFileSync(campaignPath, 'utf8');

var input = {
    language: 'Solidity',
    sources: {
        'Campaign.sol': {
            content: source
        }
    },
    settings: {
        outputSelection: {
            '*': {
                '*': [ '*' ]
            }
        }
    }
}

const output = solc.compile(input, 1).contracts;

fs.ensureDirSync(buildPath);

for(let contract in output){
    fs.outputJSONSync(
        path.resolve(buildPath, contract+'.json')
    );
}

事件.sol:

pragma solidity ^0.5.3;

contract FactoryCampaign {
    . . .
}

contract Campaign {
    . . . 
}

Solidity 在 remix 编辑器中完美运行，solc 版本为 0.5.3

solc 0.4 版本允许我直接在“源”上调用 solc.compile，但更高版本会抛出此错误

AssertionError [ERR_ASSERTION]: Invalid callback specified.

Answer 1

对于 Solidity 编译器版本 >= 0.5.0，调用 solc.compile 的语法已更改。

你会想要使用这样的东西:

const buildPath = path.resolve(__dirname, 'build');
const output = JSON.parse(solc.compile(JSON.stringify(input)));

if(output.errors) {
    output.errors.forEach(err => {
        console.log(err.formattedMessage);
    });
} else {
    const contracts = output.contracts["Campaign.sol"];
    for (let contractName in contracts) {
        const contract = contracts[contractName];
        fs.writeFileSync(path.resolve(buildPath, `${contractName}.json`), JSON.stringify(contract.abi, null, 2), 'utf8');
    }
}