[Bishonen88]

You can do most of that without ESLint for any programming language with an IDE. Speaking about jetbrains intellij/pycharm from my own experience.

[haolez]

The IDEs will sometimes use their in-house solution, and sometimes integrate one of these external tools that focus on doing just one thing very well. My setup is VSCode + ESLint when dealing with JavaScript.

[Kaze404]

The point of these tools is that the configuration is specified in the project, and works regardless of the developer's workflow.