Prettier integration & rule conflicts
Integrate Prettier with ESLint, avoid duplicate rules, and handle conflicts between style and logic rules.
Prettier integration & rule conflicts is a free TypeScript Academy lesson on CoddyKit — lesson 2 of 3. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the TypeScript Academy learning path, one of 3 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Intro
Goal: Combine Prettier (formatting) with ESLint (logic/style) without conflict.
Install
Install Prettier and ESLint plugins/configs to integrate them smoothly.
npm install --save-dev prettier eslint-config-prettier eslint-plugin-prettierPrettier config
Prettier has its own config file. Use it for formatting-only options (quotes, semicolons, line length).
// .prettierrc.json
{
"semi": false,
"singleQuote": true
}Config integrate
Add plugin:prettier/recommended to extend ESLint. It includes eslint-config-prettier and eslint-plugin-prettier.
// .eslintrc.js
module.exports = {
extends: [
"plugin:@typescript-eslint/recommended",
"plugin:prettier/recommended"
]
}Conflict example
Without config, ESLint and Prettier may disagree (e.g., semicolons). Config disables conflicting ESLint rules.
// demo.ts
const msg = "hi"
console.log(msg)
// ESLint: missing semicolon
// Prettier: auto removes semicolons if disabled
// Solution: use eslint-config-prettierRun checks
Run ESLint for logic/style, Prettier for formatting. You can also integrate both in your editor.
npx eslint "src/**/*.{ts,tsx}"
npx prettier --check "src/**/*.{ts,tsx}"Question
Quick check: What does eslint-config-prettier do?
Recap
Recap: Install Prettier + configs, add to ESLint extends, disable conflicting rules, and run both tools for harmony.
Frequently asked questions
Is the “Prettier integration & rule conflicts” lesson free?
Yes — the full text of “Prettier integration & rule conflicts” is free to read here on the web, and the TypeScript Academy course includes 3 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the TypeScript Academy course, upgrade to CoddyKit PRO.
What will I learn in “Prettier integration & rule conflicts”?
Integrate Prettier with ESLint, avoid duplicate rules, and handle conflicts between style and logic rules. You practise TypeScript Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start TypeScript Academy?
No prior experience is required. TypeScript Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 2 of 3, so you can start here or from the beginning and move at your own pace.
How long does the “Prettier integration & rule conflicts” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this TypeScript Academy lesson?
Yes. Every TypeScript Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- ESLint + @typescript-eslint
- Prettier integration & rule conflicts
- Common real-world rule sets