Use single quotes instead of double quotes. Related Projects. Prettier can restrict itself to only format files that contain a special comment, called a pragma, at the top of the file. And ESLint rules allow this type of “smarter” configuration. This works well when used in tandem with the --require-pragma option. Quoting the Why Prettier? disallow mixed spaces and tabs for indentation (no-mixed-spaces-and-tabs) The "extends": "eslint:recommended" property in a configuration file enables this rule. Please keep in mind that the .eslintrc.json extends array's order is very important. Since TSLint will soon be deprecated, we decided to replace it with ESLint. Time is mostly a rare good and, thus, development teams should automate tedious, repeatable, error-prone, and boring tasks as much as possible. Prettier is an opinionated code formatter. Then, search for Prettier. Start by adding Prettier as an ESLint rule using this first command in the terminal, followed by installing Prettier itself. Prettier is supposed to make you forget about formatting – and not be in your face about it! Start by adding Prettier as an ESLint rule using this first command in the terminal, followed by installing Prettier itself. For historical reasons, there exist two common flavors of line endings in text files. The prettier configuration will override any prior configuration in the extends array disabling all ESLint code formatting rules.With this configuration, Prettier and ESLint can be run separately without any issues. Prettier ships with a handful of format options, some of them are: Tab Width; Tabs; Semicolons; Quotes 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 :) Code-quality rules: eg no-unused-vars, no-extra-bind, no-implicit-globals, prefer-promise-reject-errors… Prettier does nothing to help with those kind of rules. Notice in the screenshot below how ESLint warnings in VSCode editor include style errors from Prettier. As my second post suggests, the idea is to use the eslint-config-prettier and add 'prettier' in the extends array after Airbnb. Valid options: true - Add a semicolon at the end of every statement. Why You Should Use ESLint, Prettier & EditorConfig. At some point in the project above, we decided to use TypeScript. tabs enforces consistent tabs. With just few clicks you are ready to go, but some doesn’t want all that magic and tons of boilerplate code (me included). GraphQL 6. If you change any options, it’s recommended to do it via a configuration file. My ESLint config extends airbnb, so it should infer 100. 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. 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. The talk of Chris Heilman at Beyond Tellerrand 2018 at Munichinspired me to emphasize what the motivation behind this article is all about. We just recently added support for eslint 5 so prettier-eslint might not work with eslint 6 as it hasn't been tested by us and depends on eslint 5. 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. 4 enforces 4 space indentation. 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. 使用 ESlint、lint-staged 半自动提升项目代码质量 . While a lot of online resources on this topic exist out there, most just give out a configuration that works for very specific projects and fail to give an in depth explanation of why ESLint, Prettier or EditorConfig can cause formatting problems. GitHub comment and BitBucket. 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。. We do that by using eslint-config-prettier and eslint-plugin-prettier. If you followed what we have done until now, you might notice a configuration error. We then modify our .eslintrc.json file to incorporate TypeScript by adding the TypeScript parser in the parser option and by adding the plugin to our extends array: We then try ESLint on our file with the fix option: And if we run the command multiple times, we get the same error even though the console says the errors can be fixed. These configuration options will override the following Prettier options (if they are not defined in the .prettierrc): As it was the case for ESLint and Prettier, if you wish to change the configuration, the rule is to check whether it is a EditorConfig or Prettier relevant configuration and then change it in the appropriate file. The migration from… A common problem that I encounter a lot happens when developers add an ESLint plugin and expect it to work without adding anything else to make Prettier work. It is also possible for Windows users to accidentally change line endings in a previously committed file from LF to CRLF. JSX 5. We want to use the right tool for the right issue as discussed in the previous article on Why You Should Use ESLint, Prettier & EditorConfig. We are using TypeScript as an example. For the rest of this post, we will use the code already written in the first article. Pretty easy right? In the extends array we utilize eslint-config-prettier to disable all formatting rules provided by ESLint.With the entry to the plugins array, we activate eslint-plugin-prettier that makes the whole process possible: ESLint runs Prettier as an ESLint rule, reports differences as individual ESLint issues, and performs auto-fixing for fixable Prettier violations. In this case it is the indent rule of the @typescript-eslint plugin. Some details explaining why it is so can be found on Wikipedia. With this configuration, Prettier and ESLint can be run separately without any issues. A pluggable and configurable linter tool for identifying and reporting on patterns in JavaScript. Prettier is hugely popular, as in February 2018 it has been downloaded over 3.5 million times. ? Print semicolons at the ends of statements. Fortunately for us, the eslint-config-prettier package already does that. Notice in the screenshot below how ESLint warnings in VSCode editor include style errors from Prettier. Sometimes this behavior is undesirable, particularly in cases where you might not have intended the string to be interpreted as code. When people collaborate on a project from different operating systems, it becomes easy to end up with mixed line endings in a shared git repository. (Tabs will be used for indentation but Prettier uses spaces to align things, such as in ternaries.). A second optional argument specifies indentation size: 2 enforces 2 space indentation. Prettier is an opinionated code formatter. 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 therefore need to disable all the code formatting rules of the added plugin by adding prettier/@typescript-eslint to our extends array. Instala o Prettier no desenvolvimento yarn add prettier eslint-config-prettier eslint-plugin-prettier -D Alterar o arquivo eslintrc.js Adicionar o arquivo .prettierrc aplica as correcoes em todos os arquivos JS na pasta SRC yarn eslint --fix src --ext .js Plugin EditorConfig para o VSCode Gerar arquivo de configuracao, conforme anexo ou commit 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.. For a good developer experience, it's useful to setup your editor to automatically run ESLint's automatic fix command (i.e. Using eslint and prettier have become standard best practices for javascript projects to maintain consitency in the code base. Will accept a PR for eslint 6 support otherwise I'll try and get to it in a couple of weeks as I'm on vacation currently. 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). In terminals with support for hyperlinks, Command-click the rule ID to open its docs. I don’t want semicolons and I prefer single quotes to double quotes for strings. Changed: The CLI helper tool no longer requires you to pipe the output of eslint --print-config to it. Finally, we have tools that runs prettier and then immediately for example eslint --fix on files. We have the exact same error as in the previous issue with a conflict between Prettier and ESLint: To follow this pattern, all code formatting rules should be set within Prettier's configuration in the .prettierrc file. (A single-line array, for example, never gets trailing commas.). Prettier will make both shorter and longer lines, but generally strive to meet the specified printWidth. It does require you to have the necessary EditorConfig plugin or extension installed on your IDE. 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。 Create React App with ESLint You may want to add ESLint and Prettier settings on a per project basis. 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. Print semicolons at the ends of statements. I think that it's going to be a subtle, but positive, change for 80 columns … In some cases you may want to rely on editor/viewer soft wrapping instead, so this option allows you to opt out with "never". If you wish to modify your configuration, you will have to remember following the pattern described above. JSON 7. Validate Indentation (indent) This option validates a specific tab width for your code in block statements. Why You Should Use ESLint, Prettier & EditorConfig. 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