Front-end JS code specification (Eslint + Prettier) - Moment For Technology (2023)

FAQs

Should I use ESLint or Prettier or both? ›

Benefits of using Prettier and ESLint

As mentioned earlier, whereas Prettier takes care of your code formatting, ESLint takes care of your code style. The former does everything automatically for you. If you have set up Prettier, you can configure it to format your file on saving it.

You can set up ESLint to run auto-fix every time you press CTRL+S (or COMMAND+S ). For ESLint to work correctly on file same, you must change the Visual Studio Code preferences. Go to File > Preferences > Settings (or Code > Preferences > Settings).

From experience, Prettier is simply better at formatting than ESLint, and covers more scenarios while at the same time having less configuration. Less configuration is less bikeshedding you need to do with your teammates.

ESLint performs automated scans of your JavaScript files for common syntax and style errors. Prettier scans your files for style issues and automatically reformats your code to ensure consistent rules are being followed for indentation, spacing, semicolons, single quotes vs double quotes, etc.

* ESLint config file. Make sure to put the Prettier config last so it overrides the settings from other configs.

Functional breaks are possible but highly unlikely. Breaking something related to the Typescript compiler is more likely but instantly spottable and easy to fix/rollback. Also, it depends on what rules you use; just eslint:recommended should be very safe.

To temporarily turn off ESLint, you should add a block comment /* eslint-disable */ before the lines that you're interested in: /* eslint-disable */ console.log('JavaScript debug log'); console.log('eslint is disabled now'); Once ESLint sees the /* eslint-disable */ comment it turns off the parsing.

Open the command palette by pressing Ctrl / Cmd + Shift + P and select 'ESLint: Show Output Channel'. If ESLint throws any errors, they should appear here. That's always a good starting point for further debugging.

How do I disable ESLint errors in Visual Studio? ›

Type 'eslint quiet' in the search bar and click the check box for quiet mode. In quiet mode, eslint would ignore basic errors.

Linting tools like ESLint allow developers to discover problems with their JavaScript code without executing it. One of the main the reason for ESLint was created was to allow developers to create their own linting rules. You can use ESLint in any application that runs on Javascript/Typescript: React/React Native.

One of the main benefits of using ESLint for software security is that it automates the detection of potential vulnerabilities. This can save you time and effort that would be spent manually reviewing your code, and can help you catch issues early on in the development process before they become a bigger problem.

Try running npx prettier --write . on your project's directory. This command will tell prettier to fix simple errors (such as this one) when found.

Open the terminal in your project root folder and install eslint as a dev dependency. We also need to enable the eslint and prettier extension for the VSCode. So visit the extensions section of VSCode (ctrl + shift + x) and search for Eslint and Prettier — Code formatter and install it.

Roles of ESLint and Prettier

ESLint is a linter that finds problems in your code and shows errors and warnings. Because it's a linter, it has a lot of rules. On the other hand, Prettier is a formatter. So when you format codes, Prettier does formatting based on ESLint.

Advantages of quick-lint-js over ESLint

According to these benchmarks, against certain constraints such as input latency, quick-lint-js is over 130 times faster than ESLint. The benchmarks also help its claim as the quickest JavaScript linter and the least energy consumer.

Do companies use ESLint? ›

ESLint is the #1 JavaScript linter by downloads on npm (over 32.1M downloads / week) and is used at companies like Microsoft, Airbnb, Netflix, and Facebook.

ESLint supports you and teams to follow a common code style in your project. It can be used in VS Code by installing it from the VS Code Marketplace. Once you have integrated it in VS Code, you can configure ESLint to enforce a code style in your files.

Linting HTML

This plugin focuses on applying ESLint rules on inline scripts contained in HTML. It does not provide any rule related to HTML. For that, you can use other plugins like @eslint-html or @angular-eslint. eslint-plugin-html is compatible with those plugins and can be used along them.

ESLint offers three settings for any given rule: error , warn , and off . The error setting will make ESLint fail if it encounters any violations of the rule, the warn setting will make ESLint report issues found but will not fail if it encounters any violations of the rule, and the off setting disables the rule.

An accumulation of excess lint around or behind your dryer can be the result of a clogged dryer vent. Since a clogged vent restricts airflow so that the air cannot move the lint to the outside of your home, it forces the lint into the area behind your dryer.

You can configure ESLint to ignore certain files and directories while linting by specifying one or more glob patterns. You can ignore files in the following ways: Add ignorePatterns to a configuration file. Create a dedicated file that contains the ignore patterns ( .eslintignore by default).

To disable all ESLint rules check on a current single line code, we can add eslint-disable-line on the right side of the code. If we want to specific only certain rules, we can append the rule name.

The primary reason ESLint was created was to allow developers to create their own linting rules. ESLint is designed to have all rules completely pluggable. The default rules are written just like any plugin rules would be. They can all follow the same pattern, both for the rules themselves as well as tests.

The ESLint configuration is in the ./node_modules/@spm/eslint-config/index.

What is linting in JavaScript? ›

Linting in JavaScript refers to the process of identifying potential errors in code by using a program. Initially, the JavaScript lint tool, like earlier similar utilities, analyzed source code to determine which compiler optimizations could be made.

To find the settings in Visual Studio Code, use the command palette to open Preferences: Open Workspace Settings (JSON). With this code in your settings.json file, ESLint will now automatically correct errors and validate JavaScript on save.

To enable linting support in Visual Studio 2022 or later versions, enable the Enable ESLint setting in Tools > Options > Text Editor > JavaScript/TypeScript > Linting. In the options page, you can also modify the set of files that you want to lint.

ESLint supports configuration files in several formats: JavaScript - use .eslintrc.js and export an object containing your configuration. JavaScript (ESM) - use .eslintrc.cjs when running ESLint in JavaScript packages that specify "type":"module" in their package.json .

Eslint is able to identify syntax errors thanks to rules. Rules are restrictions that a given block of code must follow. Eslint comes with its own set of rules but you can create custom rules for your personal project or organization project. Custom rules are created as plugins.

Technical Steering Committee. The people who manage releases, review feature requests, and meet regularly to ensure ESLint is properly maintained. Creator of ESLint, independent software developer, consultant, coach, and author.

Pro: Lint checks many things, including syntax errors and structural problems. Con: Lint can produce as many errors and warnings as there are lines of source code. This leads to high false positive and false negative rates.

ESLint: The fully pluggable JavaScript code quality tool. A pluggable and configurable linter tool for identifying and reporting on patterns in JavaScript. Maintain your code quality with ease; SonarLint: An IDE extension to detect and fix issues as you write code.

ESLint comes with several built-in formatters to control the appearance of the linting results, and supports third-party formatters as well. You can specify a formatter using the --format or -f flag in the CLI.

How do you align code with Prettier? ›

With ESLint and Prettier already installed, install these two packages as well. eslint-config-prettier : Turns off all ESLint rules that have the potential to interfere with Prettier rules. eslint-plugin-prettier : Turns Prettier rules into ESLint rules.

StandardJS Overview. StandardJS is an open-source, no configuration linter, formatter, and JavaScript style guide. It checks the code for probable errors with the linter. It also formats code automatically, and helps you write code that is easy to read and understand.

EditorConfig, ESLint, TSLint, SonarQube, and Stylelint are the most popular alternatives and competitors to Prettier.

TSLint was a linter equivalent to ESLint that was written specifically to work directly on TypeScript code. TSLint is deprecated and you should use typescript-eslint instead.

Using VSCode Prettier comes with several benefits. Here are some of the most significant benefits: Consistent code formatting: Prettier enforces a specific set of rules for formatting code, ensuring that your code is consistently formatted across your project. This makes your code more readable and easier to maintain.

ESlint is not only a code formatter, it also helps developers to find coding errors. For Example, ESLint will give you a warning if you use a variable without declaring it. Prettier doesn't have such an ability. Also, ESLint will let you know what's wrong with your code formatting and give you options to fix the issue.

From the directory you want to format, run Prettier with --write : prettier --write . This will format the entire directory recursively with Prettier. If you'd rather not install Prettier globally, then you can achieve the same effect with the npx command (the npm package runner):

Functionally there is no difference, they will both work. The VS Code extension Prettier (not Pretty Formatter, that's different) includes a recent copy of the prettier npm package inside it, which it will use by default if you don't have the package installed via npm in your repo.

ESLint comes with several built-in formatters to control the appearance of the linting results, and supports third-party formatters as well. You can specify a formatter using the --format or -f flag in the CLI.

Why do I need Prettier? ›

Prettier is very popular because it improves code readability and makes the coding style consistent for teams. Developers are more likely to adopt a standard rather than writing their own code style from scratch, so tools like Prettier will make your code look good without you ever having to dabble in the formatting.

Here's how to configure the Prettier settings on VS Code. Go to Settings by clicking “Command + ,(comma)” if you are using a Mac or “Control + ,(comma)” for Windows. Search for “Prettier” to see a list of the settings displayed. You can change them in the editor and then hit “Save” when you are done.

ESLint is capable of performing a comprehensive set of code quality checks on TypeScript. It is the recommended linter for TypeScript code.

ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code, with the goal of making code more consistent and avoiding bugs. ESLint is completely pluggable. Every single rule is a plugin and you can add more at runtime.

To do this, go to File->Preferences->Settings: Under Text Editor, select Format On Save. Now when saving a file, it will be beautified.