Serverless-webpack部署脚本与Webpack 4.8“挂起”，而3.12运行正常。

Question

我正在使用无服务器和无服务器webpack。 webpack配置非常简单：

const path = require('path');
const nodeExternals = require('webpack-node-externals');

module.exports = {
    entry: {
        lambda: './lambda.js',
    },
    output: {
        libraryTarget: 'commonjs',
        path: path.join(__dirname, '.webpack'),
        filename: '[name].js',
    },
    target: 'node',
    externals: [nodeExternals()],
    module: {
        rules: [{
            test: /\.js$/,
            loader: 'babel-loader',
            include: __dirname,
            exclude: /node_modules/,
        }, {
            test: /\.json$/,
            loader: 'json-loader',
        }],
    },
    stats: "verbose",
};

serverless.yml：

plugins:
    - serverless-webpack
    - serverless-secrets-plugin
    - serverless-plugin-split-stacks
    - serverless-offline  

custom:
    webpack:
        webpackConfig: ./webpack.config.js
    stage: ${opt:stage, self:provider.stage}

provider:
    name: aws
    runtime: nodejs8.10

functions:
    lambdaFn:
        handler: lambda.fn
        events:
            - http: GET /foo

使用webpack版本8.4进行部署时，控制台输出绝对清晰（即使启用verbose），并且节点进程占用0％CPU：

node ./node_modules/.bin/serverless offline -p 3001 -s local
Serverless: Bundling with Webpack... 

将webpack降级到3.12（最新3. *版本）时，构建成功运行。

至少，我该怎么调试呢？不幸的是，我没有在输出中看到任何错误或提示。