eslint-plugin-prefer-arrow-functions

☁️ Installation

npm install --save-dev eslint eslint-plugin-prefer-arrow-functions

🏓 Playground

Try it yourself at ASTExplorer.net by pasting code snippets in the top left panel, the results will appear in the bottom right panel.

⚖️ Configuration

Add the plugin to the plugins section and the rule to the rules section in your .eslintrc. The default values for options are listed in this example.

{
  "plugins": ["prefer-arrow-functions"],
  "rules": {
    "prefer-arrow-functions/prefer-arrow-functions": [
      "warn",
      {
        "classPropertiesAllowed": false,
        "disallowPrototype": false,
        "returnStyle": "unchanged",
        "singleReturnOnly": false
      }
    ]
  }
}

🤔 Options

classPropertiesAllowed

When true, functions defined as class instance fields will be converted to arrow functions when doing so would not alter or break their behaviour.

disallowPrototype

When true, functions assigned to a prototype will be converted to arrow functions when doing so would not alter or break their behaviour.

returnStyle

• When "implicit", arrow functions such as x => { return x; } will be
  converted to x => x.
• When "explicit", arrow functions such as x => x will be converted to
  x => { return x; }.
• When "unchanged" or not set, arrow functions will be left as they were.

singleReturnOnly

When true, only function declarations which only contain a return statement will be converted. Functions containing block statements will be ignored.

This option works well in conjunction with ESLint's built-in arrow-body-style set to as-needed.

👏🏻 Credits

This project is a fork of https://github.com/TristonJ/eslint-plugin-prefer-arrow by Triston Jones.