Use single quotes instead of double quotes. In the first method, we format our code with Prettier and then fix the linting errors with ESLint. It is opinionated. The minimum version of TypeScript supported is 2.1.3 as it introduces the ability to have leading | for type definitions which prettier outputs. In the case of the tab width setting, the default it 2 but sometimes an editor’s defaults can override it if you do not set it manually. In some cases you may want to rely on editor/viewer soft wrapping instead, so this option allows you to opt out with "never". This option allows you to switch between the default behavior (auto) and disabling this feature entirely (off). With this type of configuration, I think it would be best not to adopt a setup once and forget approach for your linting and formatting experience. We add ESLint and Prettier to our project as dev dependencies so that we can compare both tools on the same file.. npm install eslint prettier --save-dev. Almost the same applies to typescript and babel-ts. We patched the issue above by adding an ESLint rule forcing two space indentations. JSON 7. Prettier’s printWidth option does not work the same way. Any thing other than 2x and 4x is considered taboo.) At first glance, avoiding parentheses may look like a better choice because of less visual noise. Prettier can restrict itself to only format files that contain a special comment, called a pragma, at the top of the file. Here is a gif screenshot. tabs enforces consistent tabs. Fan of VueJS and TypeScript! Prettier is going to reprint the entire program from scratch in a consistent way, so it's not possible for the programmer to make a mistake there anymore. Most code conventions require either tabs or spaces be used for indentation. This rule is aimed to enforce consistent indentation style. The process of having to run two commands to lint and format our file is not very convenient. Changed: The CLI helper tool no longer requires you to pipe the output of eslint --print-config to it. To do this, they add this rule to the rules array: This effectively solves the problem by forcing the typescript-eslint indent rule to match the indentation rule of prettier. A common mistake is to forget our ESLint-Prettier pattern and apply this rule within the .eslintrc.json file like so: The generated error should be of no surprise to you if you followed everything that was said before. And ESLint rules allow this type of “smarter” configuration. For example, I don't like javascript code without semicolons, but if you can send me a PR which add this ability with as little code as possible, I'll happily accept it! Doing so produces a large git diff and thus makes the line-by-line history for a file (git blame) harder to explore. We do that by using eslint-config-prettier and eslint-plugin-prettier. There are several common guidelines which require specific indentation … I then wrote a few articles on the subject to share my findings. (Most Style-Guides set there tab-width at (2x Space-Width), but many dev's will change there settings to a (4x Space-Width). NOTE: auto-fixing will only convert invalid indent whitespace to the desired type, it will not fix invalid whitespace sizes. We take our unlinted main.js file and apply ESLint on it: We can see that the lines that have too many characters or bad indentation, are marked by prettier/prettier as errors within our ESLint error output. 最近在项目部署了ESlint还有一些配套的工具,比如 prettier husky lint-staged,有些心得写出来分享下。. Print semicolons at the ends of statements. Prettier can work in conjunction with Eslint, it has the ability to ignore code blocks or entire files you want to preserve and can be set up to run as a pre-commit hook or build step. 想在团队中推行一定的代码规范,并给不符合规范的代码做检测和提示。 Put the > of a multi-line JSX element at the end of the last line instead of being alone on the next line (does not apply to self closing elements). You need to explicitly tell them what to do, while humans can make their own (implicit) judgements, for example on when to break a line. Therefore, create an .eslintrc.json file in the root directory of your project and give it the following configuration: ? Turns off all rules that are unnecessary or might conflict with Prettier.. The idea was to upgrade our linting capabilities by using both ESLint and Prettier. If you would like to easily format your entire project, add the following to the to the "scripts" field of your package.json. When Prettier identifies cases where it looks like you've placed some code it knows how to format within a string in another file, like in a tagged template in JavaScript with a tag named html or in code blocks in Markdown, it will by default try to format that code. Please keep in mind that the .eslintrc.json extends array's order is very important. trailing commas in function parameter lists and calls, Vue files script and style tags indentation. Prettier is supposed to make you forget about formatting – and not be in your face about it! If you decide to use ESLint with Prettier rules and have configured husky to run lint-staged, point it at eslint --fix instead of prettier --write. Using eslint and prettier have become standard best practices for javascript projects to maintain consitency in the code base. I want to use tab as indentation and want the size of the tab to be four, for which I set my user settings and workspace settings as shown in following screenshots: As you can see I set 'prettier.useTabs' to true and 'prettier.tabWidth' to 4. Our code looked like this: After a lot of investigating, we managed to make ESLint and Prettier coexist and work together. On one of our TypeScript-React projects, we decided to use ESLint and Prettier to both lint and formatour code. This setup is all nice and good with this kind of small project but eventually, when one starts to use Vue, React or other frameworks, it becomes very easy to mess with both the ESLint and Prettier configurations. TSLint was a valuable project for the TypeScript community and the efforts there were greatly appreciated. My ESLint config extends airbnb, so it should infer 100. If you would like to change any other options to match your liking, checkout the options page on the prettier website. It does require you to have the necessary EditorConfig plugin or extension installed on your IDE. Time is mostly a rare good and, thus, development teams should automate tedious, repeatable, error-prone, and boring tasks as much as possible. We remove the .prettierrc.json file and run ESLint on our unformatted code: The code's indentation is at 4. Once you’ve installed ESLint, you can install the Prettier plugin called eslint-plugin-prettier, and it works for all code editors.This plugin runs Prettier as an ESLint rule and reports differences as individual ESLint issues. These two options can be used to format code starting and ending at a given character offset (inclusive and exclusive, respectively). ESLint fix runs with lint-staged library on staged file 3)Now lets setup “Prettier” to format our code Install Prettier. If you would like to change any other options to match your liking, checkout the options page on the prettier website. So if the ESLINT Airbnb linting rules contain formatting rules, they will have to be disabled if you do not want any conflicts with Prettier. Automation and early feedback are two key points of this article. ! I don’t write the best-looking code, but with Prettier I no longer have to worry about that. The range will extend: These options cannot be used with cursorOffset. However, when Prettier removes parentheses, it becomes harder to add type annotations, extra arguments or default values as well as making other changes. eslint-config-prettier. I hope this article will help you configure ESLint, Prettier and EditorConfig on your own projects. EditorConfig supports a variety of editors. The advantage of having prettier setup as an ESLint rule using eslint-plugin-prettier is that code can automatically be fixed using ESLint's --fix option.. Best bet is to go with a linter with built-in fixers, such as eslint. If the number of quotes outweighs the other quote, the quote which is less used will be used to format the string - Example: Backwards to the start of the first line containing the selected statement. We struggled for days on formatting conflicts between ESLint and Prettier formatting rules. And the job of eslint-config-prettier is to turn off all ESLint rules that are unnecessary anymore or might conflict with Prettier rules. All configuration related to the editor (end of line, indent style, indent size...) should be handled by EditorConfig, For now we only have a problem with the indentation, we do not know if there are any other rules in the, If you see your code being formatted in two different ways with Prettier and ESLint conflicting, it means you have a useless ESLint formatting rule generating this conflict and that you do not follow the pattern described above, Since our custom rule is defined within our own, Once again, by adding this rule, we just forget about Prettier and do not follow our pattern.