Changes to the "node_modules" path do not take effect.

[final567]

Operating System: Windows 10 Pro
Node Version: 14.16.1
NPM Version: 6.14.12
webpack Version: 5.37.1
webpack-dev-server Version: 4.0.0-beta.3

• This is a bug
• This is a modification request

Code

// webpack.config.js
const webpack = require('webpack');
const path = require('path');
const developmentEnvironment = 'development' ;
const productionEnvironment = 'production';


module.exports = function(env, argv) {
  return {
    mode: argv.mode === productionEnvironment ? productionEnvironment : developmentEnvironment,
    devtool: argv.mode === productionEnvironment ? 'source-map' : 'eval-source-map',
    entry: {
      index: './index'
    },
    target: 'browserslist',
    output: {
      path: path.join(__dirname, 'dist'),
      publicPath: '/dist/',
      filename: '[name].entry.js',
      chunkFilename: '[name].chunk.js'
    },
    plugins: [],
    resolve: {
      descriptionFiles: ['package.json'],
      extensions: ['.js', '.jsx', '.json', '.wasm', '...'],
      modules: [ 
        'node_modules'
      ],
      alias: {}
    },
    module: {
      rules: [
        {
          test: /\.m?js$/,
          exclude: /node_modules(\/|\\)(?!(js-base64)).*/,
          use: {
            loader: 'babel-loader',
            options: {}
          }
        }
      ]
    },
    devServer: {
      open: true,
      hot: true,
      compress: true,
      host: 'local.webui.com',
      port: 3000,
      proxy: {
        '**': 'http://local.webui.com:8080'
      },
    }
  };
};

// package.json
{
  "scripts": {
    "start": "webpack serve --mode development",
    "build": "webpack --mode production"
  },
  "browserslist": [
    ">0.2%",
    "not dead",
    "not ie < 11",
    "not op_mini all"
  ],
  "devDependencies": {
    "@babel/core": "^7.14.3",
    "@babel/plugin-syntax-dynamic-import": "^7.8.3",
    "@babel/plugin-transform-runtime": "^7.14.3",
    "@babel/preset-env": "^7.14.2",
    "@babel/runtime-corejs3": "^7.14.0",
    "autoprefixer": "^10.2.5",
    "babel-loader": "^8.2.2",
    "core-js": "^3.12.1",
    "css-loader": "^5.2.5",
    "ejs-loader": "^0.5.0",
    "exports-loader": "^3.0.0",
    "expose-loader": "^3.0.0",
    "file-loader": "^6.2.0",
    "handlebars-loader": "^1.7.1",
    "imports-loader": "^3.0.0",
    "mini-css-extract-plugin": "^1.6.0",
    "node-sass": "^6.0.0",
    "postcss-loader": "^5.3.0",
    "regenerator-runtime": "^0.13.7",
    "sass-loader": "^11.1.1",
    "script-loader": "^0.7.2",
    "style-loader": "^2.0.0",
    "url-loader": "^4.1.1",
    "webpack": "^5.37.1",
    "webpack-cli": "^4.7.0",
    "webpack-dev-server": "^4.0.0-beta.3"
  },
  "dependencies": {
    "js-base64": "^3.6.1"
  }
}

// index.js
import { Base64 } from 'js-base64';

console.log(Base64.encodeURI("asfasfasgjwig%$#&$%*&@#$*43834"));

Please paste the results of webpack-cli info here, and mention other relevant information

Expected Behavior

When writing the console.log code in the "node_modules/js-base64/base64.mjs" file, changes are detected and the screen is automatically updated.

Actual Behavior

A change is detected and a new build is made, but the console says "[webpack-dev-server] Nothing changed."
Also, the screen is not updated.
After ending the process, you must restart it for the changes to take effect.

For Bugs; How can we reproduce the behavior?

It is reproduced by writing the console.log code in the file "node_modules/js-base64/base64.mjs".

For Features; What is the motivation and/or use-case for the feature?

I frequently modify the files in the "node_modules" path for debugging. Through the link "#1970", I know that it supports change detection of the path under "node_modules" by default.
But the actual behavior is not working as I wish.
Can you help me? Thank you.

[alexander-akait]

Expected, this is to improve performance, please read this webpack/webpack#11612, you can set snapshot.managedPaths: [], but it is not recommended, feel free to feedback

[final567]

Expected, this is to improve performance, please read this webpack/webpack#11612, you can set snapshot.managedPaths: [], but it is not recommended, feel free to feedback

It works the way I want. Thanks for your help.