错误: Web3ProviderEngine不支持同步请求

Question

错误: Web3ProviderEngine不支持同步请求。我在将合同部署到rinkeby时出错

 provider const HDWalletProvider = require('truffle-hdwallet-provider')

 module.exports = async(deployer) => {
    await deployer.deploy(WETH);
    await deployer.deploy(BNB, admin, 100000e18);
    await deployer.deploy(OMG, admin, 100000e18);
    await deployer.deploy(BAT, admin, 100000e18);     
 };

Answer 1

试着做这样的事情：

module.exports = function(deployer) => {
    deployer.deploy(WETH).then(function() {
        return deployer.deploy(BNB, admin, 100000e18);
    }).then(function() {
        return deployer.deploy(OMG, admin, 100000e18);
    }).then(function() {
        return deployer.deploy(BAT, admin, 100000e18);     
    })
 };