This loader add 'then(null,callBack)' behind the await. before

async function func() {
    let res = await new Promise(resolve => {
        setTimeout(() => {
            resolve('success')
        }, 3000)
    })
}

after

async function func() {
    let res = await new Promise(resolve => {
        setTimeout(() => {
            resolve('success')
        }, 3000)
    }).then(null,callback)
}

npm install --save-dev await-then-loader

module: {
    rules: [
        {
            test: /\.js$/,
            use:{
                loader:'await-then-loader',
                options:{
                  callback: (err) => {
                    console.log(err)
                  }
                }
            }
        }
    ]
}

{
    callback: (err) => {
      console.log(err)
    }
}