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Muhammad Asif
Muhammad Asif

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Step-by-Step Guide to Setting Up Husky, ESLint, and Prettier in a Next.js TypeScript Project

#nextjs #typescript #husky #eslint

1. Install Required Packages

First, ensure you have Node.js installed. Initialize your project using:

npm init -y # OR yarn init -y
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Next, install the necessary packages:

npm install --save-dev husky lint-staged eslint prettier eslint-config-prettier eslint-plugin-prettier eslint-plugin-unused-imports @typescript-eslint/parser @typescript-eslint/eslint-plugin # OR yarn add --dev husky lint-staged eslint prettier eslint-config-prettier eslint-plugin-prettier eslint-plugin-unused-imports @typescript-eslint/parser @typescript-eslint/eslint-plugin
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2. Setup husky

Use the husky init command to set up husky in your project:

npx husky init
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This command creates a pre-commit script in .husky/ and updates the prepare script in package.json. You can later modify these scripts as per your workflow.

3. Setup pre-commit

Create a pre-commit script in .husky/pre-commit:

#!/usr/bin/env sh . "$(dirname -- "$0")/_/husky.sh" npx lint-staged
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4. Setup ESLint

Create an .eslintrc.json file in your project's root directory with ESLint configurations:

{ "$schema": "https://json.schemastore.org/eslintrc.json", "env": { "browser": false, "es2021": true, "node": true }, "extends": [ "plugin:react/recommended", "plugin:prettier/recommended", "plugin:react-hooks/recommended", "plugin:jsx-a11y/recommended", "eslint:recommended", "plugin:prettier/recommended" ], "plugins": [ "react", "unused-imports", "import", "@typescript-eslint", "jsx-a11y", "prettier" ], "parser": "@typescript-eslint/parser", "parserOptions": { "ecmaFeatures": { "jsx": true }, "ecmaVersion": 12, "sourceType": "module" }, "settings": { "react": { "version": "detect" } }, "rules": { "no-console": "warn", "react/prop-types": "off", "react/jsx-uses-react": "off", "react/react-in-jsx-scope": "off", "react-hooks/exhaustive-deps": "off", "jsx-a11y/click-events-have-key-events": "warn", "jsx-a11y/interactive-supports-focus": "warn", "prettier/prettier": "warn", "no-unused-vars": "off", "unused-imports/no-unused-vars": "off", "unused-imports/no-unused-imports": "warn", "object-curly-spacing": [ "error", "never" ], "@typescript-eslint/no-unused-vars": [ "warn", { "args": "after-used", "ignoreRestSiblings": false, "argsIgnorePattern": "^_.*?$" } ], "import/order": [ "warn", { "groups": [ "type", "builtin", "object", "external", "internal", "parent", "sibling", "index" ], "pathGroups": [ { "pattern": "~/**", "group": "external", "position": "after" } ], "newlines-between": "always" } ], "react/self-closing-comp": "warn", "react/jsx-sort-props": [ "warn", { "callbacksLast": true, "shorthandFirst": true, "noSortAlphabetically": false, "reservedFirst": true } ], "padding-line-between-statements": [ "warn", { "blankLine": "always", "prev": "*", "next": "return" }, { "blankLine": "always", "prev": [ "const", "let", "var" ], "next": "*" }, { "blankLine": "any", "prev": [ "const", "let", "var" ], "next": [ "const", "let", "var" ] } ] } }
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5. Setup ESLint Ignore

Create an .eslintignore file to ignore specific files from ESLint:

.next/* *.css dist esm/* public/* tests/* scripts/* *.config.js node_modules coverage .next build
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6. Setup Prettier

Create a .prettierrc.json file with Prettier configurations:

{ "$schema": "https://json.schemastore.org/prettierrc.json", "tabWidth": 2, "printWidth": 100, "semi": true, "useTabs": false, "singleQuote": false, "bracketSpacing": false, "endOfLine": "auto", "arrowParens": "always", "trailingComma": "all" }
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7. Setup Prettier Ignore

Create a .prettierignore file to ignore specific files from Prettier:

dist node_modules .next build scripts
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8. Configure Husky and lint-staged

Update your package.json with Husky and lint-staged configurations:

"husky": { "hooks": { "pre-commit": "lint-staged" } }, "lint-staged": { "*.{js,jsx,ts,tsx,json,css,scss,md}": [ "eslint --fix", "prettier --write" ] }
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9. Add Scripts

Optionally, add scripts to your package.json for easier usage:

"scripts": { "eslint": "eslint . --ext .js,.jsx,.ts,.tsx", "format": "prettier --write ." }
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Now, you can run npm run eslint to check for linting errors and npm run format to format your code with Prettier. Before committing your code, Husky will automatically run lint-staged, fixing linting errors and formatting your code.

Top comments (2)

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shivanandan17 profile image
Shivanandan D N •

Good read. Additional info, use npm run eslint -- --fix for auto fixing lint warns.

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bpinazmul18 profile image
Md Nazmul Haque •

not working too much errors I've found