helpers.isWebpackDevServer() always returns false (Win 10)

[delie]

• [x ] bug report
• What is the current behavior?
  helpers.isWebpackDevServer always returns false (when used inside webpack config for anything other than src/index.html page).

To test, add the following line to webpack.common.js then run "npm run server:dev" and then "npm run build:dev" to watch the output.
console.log('DEBUG: helpers.isWebpackDevServer() = ' + helpers.isWebpackDevServer());

I presume it's intended for use by the HtmlWebpackPlugin and the src/index.html page, but if you want to use it elsewhere it breaks. As it's quite a handy function, I am also using it for setting a few other conditional variables inside my webpack config.

• What is the expected behavior?
• Expected helpers.isWebpackDevServer() to return TRUE when running "npm run server:dev"
• Expected helpers.isWebpackDevServer() to return FALSE when running "npm run build:dev"
• Please tell us about your environment:
  Windows 10, command line.
• Possible solution:
  Why not do a simple indexOf? e.g.

function isWebpackDevServer() {
    var returnValue = false;
    if (process.argv.length > 1)
        returnValue = (process.argv[1].toLowerCase().indexOf('webpack-dev-server') != -1);
    return returnValue;
}

I might be missing something, but this seems to cover all bases

[rzubov]

It's not only related to windows 10. I have tested on win7, and it's work the same.
It's actually expected behavior: 'webpack-dev-server' string transform to the path like
'D:\angular2-webpack-starter\node_modules\webpack-dev-server\bin\webpack-dev-server.js', and it's according to documentation:
https://nodejs.org/docs/latest/api/process.html#process_process_argv.