ESLint

We always try to write the best code possible, but sometimes errors happen, and spending a few hours catching a bug due to a typo is very frustrating. Luckily, there are some tools that can help us check the correctness of our code as soon as we type it.

These tools are not able to tell us if our code is going to do what it supposed to do, but they can help us to avoid syntactical errors.

If you come from a static language such as C#, you are used to getting that kind of warning inside your IDE.

Douglas Crockford made linting popular in JavaScript with JSLint (initially released in 2002) a few years ago; then we had JSHint and finally, the de-facto standard in the React world nowadays is ESLint.

ESLint is an open-source project released in 2013 that became popular thanks to the fact that it is highly configurable and extensible.

In the JavaScript ecosystem, where libraries and techniques change very quickly, it is crucial to have a tool that can be easily extended with plugins, and...