Why does the __dirname variable show the wrong path?

Question

Node.js

In webpack 4, I created a src folder and an index.j file in it, in which I wrote alert(__dirname);
In the console, I run webpack --mode production, then webpack-dev-server --mode development.
And in the browser alert gives me "/".
Although __dirname is the path to the folder with the file in which it is written and should be src

Answer 1

target: 'node',
node: {
  __dirname: false,
}

or:

plugins: [
  new webpack.DefinePlugin({
    $dirname: '__dirname',
  }),
]