如何在将webpack版本写入磁盘之前将其输出捕获为字符串？

npm install webpack webpack-dev-middleware --save-dev

const webpack = require('webpack');
const webpackConfig = require('./webpack.config.js');
const webpackDevMiddleware = require('webpack-dev-middleware');

const compiler = webpack(webpackConfig);

// 添加webpack-dev-middleware插件
app.use(webpackDevMiddleware(compiler, {
  publicPath: webpackConfig.output.publicPath
}));

const fs = require('fs');
const path = require('path');
const webpack = require('webpack');
const webpackConfig = require('./webpack.config.js');
const webpackDevMiddleware = require('webpack-dev-middleware');

const compiler = webpack(webpackConfig);

// 添加webpack-dev-middleware插件
const middleware = webpackDevMiddleware(compiler, {
  publicPath: webpackConfig.output.publicPath
});

// 在webpack编译完成后，将输出内容捕获为字符串
middleware.waitUntilValid(() => {
  const outputPath = path.join(webpackConfig.output.path, webpackConfig.output.filename);
  const outputContent = fs.readFileSync(outputPath, 'utf-8');
  console.log(outputContent);
});