eslint-plugin-no-em-dash

ESLint rule to disallow em dash characters in code.

Requirements

• Node.js >= 18.18.0
• ESLint >= 8.0.0

Installation

npm install eslint-plugin-no-em-dash --save-dev

Usage

ESLint 9.x (Flat Config) - Recommended

In your eslint.config.js:

import noEmDash from "eslint-plugin-no-em-dash";

export default [
  // Use the recommended flat config
  noEmDash.configs["flat/recommended"],

  // Or configure manually
  {
    plugins: {
      "no-em-dash": noEmDash
    },
    rules: {
      "no-em-dash/no-em-dash": "error"
    }
  }
];

ESLint 8.x (Legacy Config)

In your .eslintrc.js or .eslintrc.json:

{
  "plugins": ["no-em-dash"],
  "rules": {
    "no-em-dash/no-em-dash": "error"
  }
}

Or use the recommended config:

{
  "extends": ["plugin:no-em-dash/recommended"]
}

Rules

no-em-dash

Disallows em dash characters (U+2014) in string literals and template literals.

Why?

• Em dashes are often inserted by auto-correct in editors and word processors
• They can cause issues when code is shared across different environments
• Regular hyphens are easier to type and more universally supported
• Prevents copy-paste issues from external documents

Examples of incorrect code:

const message = "Hello - world";  // em dash
const template = `Status - OK`;   // em dash

Examples of correct code:

const message = "Hello - world";  // regular hyphen
const template = `Status - OK`;   // regular hyphen

License

MIT