如何使用solc 0.5编译solidity

Question

compile.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')
    );
}

Campaign.sol：

pragma solidity ^0.5.3;

contract FactoryCampaign {
    . . .
}

contract Campaign {
    . . . 
}

solc版本的solc版本在混合编辑器中运行得很好，为0.5.3。

solc版本0.4允许我直接调用“源”上的solc.compile，但是后面的版本会抛出这个错误

AssertionError ERR_ASSERTION:指定的无效回调。

Answer 1

使用Solidity编译器版本>= 0.5.0，调用solc.compile的语法发生了变化。

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');
    }
}