Tempered - ESLint and Prettier Configuration

Tempered is an ESLint and Prettier configuration package designed for JS/TS projects. It provides a strict, consistent, and optimized setup for linting and formatting your code.

Features

• ✅ Strict ESLint configuration for consistency and best practices 
• 🎯 Prettier integration for automatic code formatting 
• 🧩 Plugin-based setup with community-adopted ESLint plugins 
• 📦 Handles import sorting, unused code cleanup, and more 
• ⚙️ Dual mode: use via CLI or as an extendable ESLint config 

Installation

Install Tempered as a development dependency:

npm install --save-dev tempered

Note: For config extension, you must also install the required peer dependencies (see below).

🔧 Usage

🧱 Mode 1: CLI (key-in-hand)

Run directly via npx using the built-in commands:

npx tempered help
npx tempered eslint .
npx tempered eslint:light src/
npx tempered prettier --write .

🧩 Mode 2: ESLint config extension

Extend one of the Tempered configs in your eslint.config.js:

Strict config (recommended):

import strict from '@foundry/tempered/configs/strict.config.js'

export default strict

OR

Light config (recommended):

import strict from '@foundry/tempered/configs/light.config.js'

export default strict

Required peerDependencies

If you're using Tempered as a config extension (mode 2), make sure to install the following peer dependencies in your project:

npm install --save-dev \
eslint \
prettier \
@eslint/js \
typescript-eslint \
eslint-plugin-import \
eslint-plugin-prettier \
eslint-plugin-perfectionist \
eslint-plugin-simple-import-sort \
eslint-plugin-sonarjs \
eslint-plugin-unicorn \
eslint-plugin-unused-imports \
globals

Or install all at once via:

npm install --save-dev @foundry/tempered @eslint/js eslint prettier typescript-eslint eslint-plugin-import eslint-plugin-prettier eslint-plugin-perfectionist eslint-plugin-simple-import-sort eslint-plugin-sonarjs eslint-plugin-unicorn eslint-plugin-unused-imports globals