README.md

@feature-sliced/eslint-config

WIP: At the moment at beta-testing - use carefully

Linting of FeatureSliced concepts by existing eslint-plugins

• Control Isolation & Decomposition
• Control Public API
• Control Layers & Scopes
• Control Naming

Rules

Each rule has its own test cases and customization aspects

• import-order
• public-api
• layers-slices

Get Started

1. You'll first need to install ESLint:

   $ npm install -D eslint
   # or by yarn
   $ yarn add -D eslint
   $ or by pnpm 
   $ pnpm add -D eslint

2. Next, install @feature-sliced/eslint-config and dependencies:

   $ npm install -D @feature-sliced/eslint-config eslint-plugin-import eslint-plugin-boundaries
   # or by yarn
   $ yarn add -D @feature-sliced/eslint-config eslint-plugin-import eslint-plugin-boundaries
   # or by pnpm 
   $ pnpm add -D @feature-sliced/eslint-config eslint-plugin-import eslint-plugin-boundaries

3. Add config to the extends section of your .eslintrc configuration file (for recommended rules). You can omit the eslint-config postfix:

   {
       "extends": ["@feature-sliced"]
   }

4. TYPESCRIPT-ONLY: Also setup TS-parser and TS-plugin (why?)

   Details

   Install dependencies:

   $ npm i -D @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint-import-resolver-typescript
   # or by yarn
   $ yarn add -D @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint-import-resolver-typescript

   Configure @typescript-eslint/parser as parser and setup the eslint-import-resolver-typescript resolver in the .eslintrc config file:

   {
     "parser": "@typescript-eslint/parser",
     "settings": {
       "import/resolver": {
         "typescript": {
           "alwaysTryTypes": true
         }
       }
     }
   }

Usage

• Support general aliases

  import { Input } from "~/shared/ui/input";
  import { Input } from "@/shared/ui/input";
  import { Input } from "@shared/ui/input";
  import { Input } from "$shared/ui/input";
  // But not - import { Input } from "$UIKit/input";

• Support relative and absolute imports (but look at recommendations)

  import { ... } from "entities/foo";    // absolute imports
  import { ... } from "@/entities/foo";  // aliased imports
  import { ... } from "../entities/foo"; // relative imports

• Case-agnostic

  import { ... } from "entities/user-post";  // Support kebab-case (recommended)
  import { ... } from "entities/UserPost";   // Support PascalCase
  import { ... } from "entities/userPost";   // Support camelCase
  import { ... } from "entities/user_post";  // Support snake_case

• For exceptional cases, support ⚠️DANGEROUS-mode⚠️ (see more for specific rule)

Customization

1. You can partially use the rules

   WARN: Don't use main config ("@feature-sliced") in customization to avoid rules conflicts.

   "extends": [
     "@feature-sliced/eslint-config/rules/import-order",
     "@feature-sliced/eslint-config/rules/public-api",
     "@feature-sliced/eslint-config/rules/layers-slices",
   ]

2. You can use alternative experimental rules

   • Use import-order/experimental for formatting with spaces between groups and reversed order of layers (why?)

     "extends": [
       // ... Other rules or config
       "@feature-sliced/eslint-config/rules/import-order/experimental",
     ]

   • Use public-api/lite for less strict PublicAPI boundaries (why?)

     "extends": [
       // ... Other rules or config
       "@feature-sliced/eslint-config/rules/public-api/lite",
     ]

3. You can use warnings instead of errors for specific rules

   "rules": {
      // feature-sliced/import-order
      "import/order": "warn" // ~ 1,
      // feature-sliced/public-api
      "import/no-internal-modules": "warn" // ~ 1,
      // feature-sliced/layers-slices
      "boundaries/element-types": "warn" // ~ 1,
   }

4. You can use advanced FSD-specific messages processing

   # (feature-sliced/public-api)
   - 'Reaching to "features/search/ui" is not allowed.'
   + 'Violated usage of modules Public API | https://git.io/Jymjf'

See also

• FAQ
• Releases & Changelog
• How can I help?
  • ⭐ Rate us on GitHub
  • 💫 Any assistance is important - from feedback to participation in the development of the methodology!