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  1. Web development
  2. JavaScript
  3. JavaScript linters
  4. ESLint

ESLint

Last modified: 27 November 2024

Required plugin:

Javascript and TypeScript  -  The plugin is bundled with GoLand and enabled by default.

GoLand integrates with ESLint which brings a wide range of linting rules that can also be extended with plugins. GoLand shows warnings and errors reported by ESLint right in the editor, as you type. With ESLint, you can also use JavaScript Standard Style as well as lint your TypeScript code.

Besides JavaScript and TypeScript, ESLint can be applied to files of other types in the entire project or in its specific parts, refer to Configure linting scope.

Before you start

  1. Download and install Node.js.

  2. Configure a Node.js interpreter in your project as described in Configuring a local Node.js interpreter, or in Using Node.js on Windows Subsystem for Linux, or in Configuring remote Node.js interpreters.

Install ESLint

Learn more from the ESLint official website.

Configuration file

Supported formats of configuration files

Depending on the ESLint version you are using, GoLand recognizes configurations in the following file types:

ESLint version 9 and later

eslint.config.js, eslint.config.mjs, or eslint.config.cjs (flat format), learn more from the ESLint official website.

You can also use configuration files written in TypeScript, such as, eslint.config.ts, eslint.config.mts, or eslint.config.cts. To do that, you need to specify the unstable_ts_config flag.

ESLint version 8 and earlier

  • .eslintrc.* (.eslintrc, .eslintrc.json, or .eslintrc.yaml file, or a file in another supported format).

  • .eslintignore

  • package.json with a eslintIgnore or a eslintConfig property. This configuration system is deprecated, learn more from the ESLint official website.

Learn how to switch to the flat format from ESLint configuration migration guide.

Create and edit a configuration file

Configure ESLint in GoLand

By default, ESLint is configured automatically. You can choose to specify all the configuration settings manually or disable ESLint.

Configure ESLint automatically

With automatic configuration, GoLand uses the ESLint package from the project node_modules folder and the configuration file from the folder where the current file is stored. If no configuration file is found in the current file folder, GoLand will look for one in its parent folders up to the project root.

If you have several package.json files with ESLint listed as a dependency, GoLand starts a separate process for each package.json and processes everything below it. This lets you apply a specific ESLint version or a specific set of plugins to each path in a monorepo or a project with multiple ESLint configurations.

Configure ESLint manually

With manual configuration, you can use a custom ESLint package, configuration file, and working directories, as well as apply various additional rules and options.

Configure linting scope

  1. Open the Settings dialog (CtrlAlt0S) , go to Languages & Frameworks | JavaScript | Code Quality Tools | ESLint, and select Automatic ESLint configuration or Manual ESLint configuration.

  2. In the Run for files field, specify the pattern that defines the set of files to be linted. You can accept the default pattern or type a custom one.

    With the default pattern, **/*.{js,ts,jsx,tsx,cjs,cts,mjs,mts,html,vue}, ESLint will wake up and process any updated JavaScript, TypeScript, JSX, TSX, HTML, or Vue file. To lint files of other types or files stored in specific folders, use glob patterns to update the default pattern.

    • For example, to automatically lint CoffeeScript files as well, add coffee to the default pattern as follows:

      **/*.{js,ts,jsx,tsx,cjs,cts,mjs,mts,html,vue,coffee}

    • To lint files from a specific folder, including subfolders, replace **/* with <path to the folder>/**/*.

      Suppose, you have a project with the following structure:

      ESLint: custom patterns. Example project structure

      To lint only the files in the coffee folder, update the pattern as follows:

      coffee/*.{js,ts,jsx,tsx,cjs,cts,mjs,mts,html,vue,coffee}

      As a result, the file linting.coffee is linted while no_linting .coffee is not.

Fix problems automatically on save

ESLint can fix the detected problems every time your changes are saved either manually, with Ctrl0S, or automatically, when you launch a run/debug configuration, or close GoLand, or perform version control actions For more information, refer to Autosave.

  • Open the Settings dialog (CtrlAlt0S) , go to Languages & Frameworks | JavaScript | Code Quality Tools | ESLint, and select the Run eslint --fix on save checkbox.

tip

Enabling this option also enables Run eslint --fix in Settings | Tools | Actions on Save.

Lint your code

When installed and enabled, ESLint activates automatically every time you open a JavaScript file. You can also configure ESLint to detect and fix problems automatically on save.

By default, GoLand marks detected problems based on the severity levels from the ESLint configuration. See Configuring ESLint highlighting to learn how to override these settings.

Descriptions of the errors detected in the current file and quick-fixes for them are available from the editor and from the File tab of the Problems tool window.

Errors in all previously opened files and quick-fixes for them are shown in the Project Errors tab of the Problems tool window. To open the tool window, click the Inspection widget in the upper-right corner of the editor:

Inspection widget

For more information, refer to View problems and apply quick-fixes in the editor and Problems tool window.

View problems and apply quick-fixes in the editor

Lint your code in the Problems tool window

To open the Problems tool window, click the Inspections widget in the upper-right corner of the editor.

Inspection widget

Alternatively, select View | Tool windows | Problems from the main menu or press Alt06.

The Project Errors tab shows the errors in all files that were opened during the current session, with error messages grouped by files in which they were detected.

Problems tool window, ESLint. Project Errors tab shows syntax errors in previously opened files across the project

Here you can view problem descriptions, apply quick-fixes, navigate to the fragments in the source code where errors occurred, as well as fix them in the Editor Preview pane without leaving the tool window. Learn more from Problems tool window.

Configure highlighting for ESLint

By default, GoLand marks the detected errors and warnings based on the severity levels from the ESLint configuration. For example, errors are highlighted with a red squiggly line, while warnings are marked with a yellow background.

Change the severity level of a rule in the ESLint configuration

Ignore the severity levels from the configuration

You can override the severities from the ESLint configuration so that GoLand ignores them and shows everything reported by the linter as errors, warnings, or in a custom color.

Specifying a custom severity level for ESLint

Ignore the severity levels from the configuration

  1. In the Settings dialog (CtrlAlt0S) , select Editor | Inspections. The Inspections page opens.

  2. In the central pane, go to JavaScript | Code quality tools | ESLint.

  3. In the right-hand pane, clear the Use rule severity from the configuration file checkbox and select the severity level to use instead of the default one.

Import code style from ESLint

You can import some of the ESLint code style rules to the GoLand JavaScript code style settings. That enables GoLand to use more accurate code style options for your project when auto-completing, generating, or refactoring the code or adding import statements. When you use the Reformat action, GoLand will then no longer break properly formatted code from the ESLint perspective.

GoLand understands ESLint configurations in all official formats, see also Supported formats of ESLint configuration files above:

  • eslint.config.js, eslint.config.mjs, eslint.config.cjs, eslint.config.ts, eslint.config.mts, or eslint.config.cts (flat format) for ESLint version 9 and later.

  • .eslintrc files and package.json files with the eslintConfig property for ESLint version 8 and earlier.

Learn more from the ESLint official website.

Use JavaScript Standard Style

You can set JavaScript Standard Style as default JavaScript code style for your application so its main rules are applied when you type the code or reformat it. Since Standard is based on ESLint, you can also use Standard via the GoLand ESLint integration.

Install JavaScript Standard

Enable linting with Standard via ESLint

If you open a project where standard is listed in the project's package.json file, GoLand enables linting with Standard automatically.

  1. In the Settings dialog (CtrlAlt0S) , go to Languages & Frameworks | JavaScript | Code Quality Tools | ESLint.

  2. On the ESLint page that opens, select Manual ESLint configuration and specify the location of the standard package in the ESLint Package field.

Set the JavaScript Standard Style as default

  1. In the Settings dialog (CtrlAlt0S) , go to Editor | Code Style | JavaScript.

  2. On the JavaScript page, click Set from, and then select JavaScript Standard Style. The style will replace your current scheme.

ESLint with Docker

With GoLand, you can run ESLint against your code inside a Docker container just in the same way as you do it locally.

  1. Install the Node.js and Node.js Remote Interpreter plugins on the Settings | Plugins page, tab Marketplace, as described in Installing plugins from JetBrains Marketplace.

  3. Download, install, and configure Docker as described in the Docker topic.

  4. Open your package.json and make sure ESLint is listed in the devDependencies section:

    {
  "name": "node-eslint",
  "version": "0.0.0",
  "private": true,
  "scripts": {
    "start": "node ./bin/www"
  },
  "dependencies": {
    "cookie-parser": "~1.4.4",
    "debug": "~2.6.9",
    "express": "~4.16.1",
    "http-errors": "~1.6.3",
    "morgan": "~1.9.1",
    "pug": "2.0.0-beta11"
  },
  "devDependencies": {
    "@eslint/js": "^9.15.0",
    "eslint": "^9.15.0",
    "globals": "^15.12.0"
  }
}

  5. Right-click anywhere in the editor and select Run '<package manager> install' from the context menu.

  6. After that, ESLint works in the same way as when you work with your code locally. View descriptions of detected discrepancies right in the editor or in the Problems tool window and apply suggested quick-fixes.

    ESLint in a Docker container

See also

Procedures