Webpack require is not a function?

Question

JavaScript

Why, when connecting koa-body After processing with webpack, I get an error when starting the server
import bodyParser from "koa-body";

var crypto = require('crypto');
             ^

TypeError: require is not a function

.babelrc

{
  "presets": ["@babel/preset-env","@babel/preset-react"]
}

webpack

rules: [
      {
        test: /\.(m?js|jsx)$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader'
        }
      }
    ]