@babel/helper-get-function-arity

What is @babel/helper-get-function-arity?

The @babel/helper-get-function-arity package is a utility within the Babel compiler ecosystem. It is designed to help retrieve the arity (the number of arguments) of a function. This can be particularly useful when working with transformations and manipulations of JavaScript code, where understanding the function signature is necessary for generating or modifying code accurately.

What are @babel/helper-get-function-arity's main functionalities?

Get function arity

This feature allows developers to easily determine the number of parameters that a function expects. It is particularly useful in scenarios where code is being dynamically generated or modified, and the arity of functions needs to be preserved or analyzed.

const getFunctionArity = require('@babel/helper-get-function-arity');

function myFunction(a, b, c) {}

const arity = getFunctionArity(myFunction);
console.log(arity); // Outputs: 3

Other packages similar to @babel/helper-get-function-arity

arity-n

The 'arity-n' package allows users to create a function with a specified arity. While it serves a somewhat inverse purpose compared to @babel/helper-get-function-arity, it is related in the sense that both deal with the concept of function arity. 'arity-n' can be used to enforce a specific arity on functions, which could complement the arity analysis provided by @babel/helper-get-function-arity in certain code transformation scenarios.

README

@babel/helper-get-function-arity

Helper function to get function arity

See our website @babel/helper-get-function-arity for more information.

Install

Using npm:

npm install --save @babel/helper-get-function-arity

or using yarn:

yarn add @babel/helper-get-function-arity

Changelog

v7.16.7 (2021-12-31)

:eyeglasses: Spec Compliance

• babel-parser
  • #14049 fix: check preceding line break before exclamation (@JLHwung)

:bug: Bug Fix

• babel-plugin-transform-runtime, babel-runtime-corejs2, babel-runtime-corejs3, babel-runtime
  • #14081 Import the correct ./typeof.js helper in @babel/runtime (@exb)
• babel-helpers
  • #14072 Fix derived classes in Chrome <= 36 (@nicolo-ribaudo)
• babel-helper-function-name, babel-plugin-transform-function-name
  • #14047 Fix unicode handling in generated function names (@The-x-Theorist)

:nail_care: Polish

• babel-core
  • #14067 Allow $schema property in json config files (@The-x-Theorist)