ESLint plugin to prefer arrow functions. By default, the plugin allows usage of
function as a member of an Object's prototype, but this can be changed with the property
disallowPrototype. Functions referencing
this will also be allowed. Alternatively, with the
singleReturnOnly option, this plugin only reports functions where converting to an arrow function would dramatically simplify the code.
Class methods will not produce errors unless the
classPropertiesAllowed flag is set.
This plugin will automatically fix your code using ESLint's
--fix option, as long as you use the
Install the npm package
# If eslint is installed globallynpm install -g eslint-plugin-prefer-arrow# If eslint is installed locallynpm install -D eslint-plugin-prefer-arrow
Add the plugin to the
plugins section and the rule to the
rules section in your .eslintrc
"plugins":"prefer-arrow""rules":"prefer-arrow/prefer-arrow-functions":"warn""disallowPrototype": true"singleReturnOnly": false"classPropertiesAllowed": false
disallowPrototype: If set to true, the plugin will warn if
functionis used anytime. Otherwise, the plugin allows usage of
functionif it is a member of an Object's prototype.
singleReturnOnly: If set to true, the plugin will only warn for
functiondeclarations which only contain a return statement. These often look much better when declared as arrow functions without braces. Works well in conjunction with ESLint's built-in arrow-body-style set to
classPropertiesAllowed: If set to true, the plugin will warn about functions which could be replaced with arrow functions defined as class instance fields. Enable if you're using Babel's transform-class-properties plugin.
To autofix your code, simply run ESLint with the
--fix option. Note that this only works when the
singleReturnOnly option is set to true.
eslint --fix src