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