Ranked in these QuestionsQuestion Ranking
Pro Highly flexible ruleset
ESLint allows customizing rules for errors, best practices, variable declarations, ES6, style and JS running on Node. Additionally, custom rules can be applied.
Pro Good ES6 support
Pro Functionality can be extended with a wide variety of plugins
A wide variety of plugins are available on npm's repository.
Pro JSX support
Pro Clear warnings and error messages
Warnings and error messages are detailed and easy to understand because of the usage of natural language throughout all warnings and messages.
For each message, the rule name is given so you can know what rule is being broken.
Con Requires some configuration before use
Con The documentation can be a hit or miss
ESLint's documentation is very detailed and helpful in some parts, while in others it gets a little confusing.
For example, the rules list is easy to follow and is grouped into logical categories, while the configuration tutorials can get a little confusing.