Introduction to eslint-config-prettier

`eslint-config-prettier` is an essential tool for JavaScript developers that helps to integrate ESLint with Prettier, ensuring that your code is both linted and formatted consistently. It turns off all rules that are unnecessary or might conflict with Prettier.

How to Install

  
    npm install --save-dev eslint-config-prettier
  

Configuration

To use `eslint-config-prettier`, extend the configuration in your ESLint configuration file:

  
    {
      "extends": [
        "eslint:recommended",
        "plugin:prettier/recommended"
      ]
    }
  

Disabling Conflicting Rules

`eslint-config-prettier` disables conflicting rules that could cause issues with Prettier formatting. Here’s an example:

  
    {
      "extends": [
        "eslint:recommended",
        "plugin:prettier/recommended"
      ],
      "rules": {
        "prettier/prettier": "error"
      }
    }
  

Key APIs and Their Usage

plugin:prettier/recommended

This plugin configures Prettier as an ESLint rule and applies its settings:

  
    {
      "extends": [
        "plugin:prettier/recommended"
      ]
    }
  

prettier/prettier

This rule allows you to specify that Prettier is used to format code:

  
    {
      "rules": {
        "prettier/prettier": "error"
      }
    }
  

Adding Custom Prettier Configurations

You can customize Prettier settings by creating a `.prettierrc` file in your project:

  
    {
      "printWidth": 80,
      "tabWidth": 2,
      "semi": false,
      "singleQuote": true
    }
  

Example: Setting Up an Application with eslint-config-prettier

Here is an example project setup:

  
    // .eslintrc.json
    {
      "extends": [
        "eslint:recommended",
        "plugin:prettier/recommended"
      ],
      "rules": {
        "prettier/prettier": "error"
      }
    }

    // .prettierrc
    {
      "printWidth": 80,
      "tabWidth": 2,
      "semi": false,
      "singleQuote": true
    }

    // index.js
    export function sayHello(name) {
      return `Hello, ${name}!`;
    }

    console.log(sayHello('World'));
  

Conclusion

Integrating `eslint-config-prettier` into your JavaScript projects ensures cleaner code and avoids conflicts between ESLint and Prettier. Use the configuration and APIs provided above to streamline your development process.

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