exclude node_modules by default in _watch for content base

[alexander-akait]

• Operating System: no matter
• Node Version: no matter
• NPM Version: no matter
• webpack Version: no matter
• webpack-dev-server Version: 3.3.0

• This is a bug
• This is a modification request

Code

no matter

Expected Behavior

Actual Behavior

Looks it was bug also in previous webpack-dev-server version, but we watch only on depth, no we relax this so some developers get problem with watching and fs

https://github.com/webpack/webpack-dev-server/blob/master/lib/Server.js#L301

For Bugs; How can we reproduce the behavior?

Just run webpack-dev-server without configuration

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