![]() In short, quite similar to Prettier but you need the configuration file. It is extremely extensible as well in case you're interested.Īt the time of this writing, ESLint is in version 7.32.0, so keep in mind things might change (especially formatting) in future versions. If any of the staged files are not properly linted or formatted this will give you a warning and will stop you from committing the changes in the code. I like ESLint for the simple reason it helps me to find problems and configure some patterns in the project (it might be useful when onboarding new people). The lint-staged will run eslint command on javascript files that are staged, and the pretty-quick will format the JavaScript files if they arent using Prettier. Again, I invite you to read ESLint documentation if you want to go deeper into the topic. In short, it does a bit more than Prettier as it analyzes your code to find problems (or patterns that you don't want, like variables that are not used should be removed). Check their configuration documentation for more details.ĮSLint has been around for a while. And this is where style guide provided by AirBnB comes in handy. But for a beginner, the options provided by Eslint can be overwhelming. On top of that, you can also extend configuration and set up a few other things. Eslint helps to find and fix problems in your JavaScript code whilst Prettier is an opinionated code formatter. I will consider you have a project set up already so in short, you need to install it:Įnter fullscreen mode Exit fullscreen mode I like it for two reasons: we barely have to discuss code formatting and it is easy to onboard new members to the team.Īt the time of this writing, Prettier is in version 2.4.1, so keep in mind things might change (especially formatting) in future versions. Do you use ? If yes, it will ensure that all your files have it, for example. What does it mean? It means that it will keep your codebase consistent (in terms of coding style). I would leave it to you to read more about what it is but, in short, it is a code formatter. The first tool I want to explore is Prettier. The main focus is how to set up Prettier, how to set up ESLint, how to integrate both, and by the end how to add Typescript to it. In this article, I will summarize some understandings that I've about integrating all the tools above. I have a hard time accepting that something works but I can't understand unless it is an external tool that I didn't have to set up myself but that was not the case here. CI was linting, commit hooks were also linting, VSCode was fixing the code, and so on (that is what I thought).Īt some point I was playing with the project and realized that some files were being warned by my editor but not when running the linter ( npm run lint in my case). We've started a new project in the company, Prettier was set up, ESLint was set up and at some point, we added Typescript. These rules will become more complicated as new features become a part of JavaScript.I decided to write this article to sum up a struggle of mine. ASI contains a few eccentric behaviors, though, and your code will break if JavaScript misinterprets your line break. Why? When JavaScript encounters a line break without a semicolon, it uses a set of rules called Automatic Semicolon Insertion to determine whether it should regard that line break as the end of a statement, and (as the name implies) place a semicolon into your code before the line break if it thinks so. ![]() See Translationġ.1 Primitives: When you access a primitive type you work directly on its value.Ĭonst numbers = // bad let sum = 0 for ( let num of numbers ) // bad createHero ( firstName, lastName, inventorOf ) // good createHero ( firstName, lastName, inventorOf, ) // good (note that a comma must not appear after a "rest" element) createHero ( firstName, lastName, inventorOf , This guide is available in other languages too. It also assumes you are installing shims/polyfills in your app, with airbnb-browser-shims or the equivalent. ![]() Note: this guide assumes you are using Babel, and requires that you use babel-preset-airbnb or the equivalent. A mostly reasonable approach to JavaScript ![]()
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