babel-helper-get-function-arity

Get Function Arity

This feature allows you to get the number of parameters of a function. In the code sample, a function declaration with two parameters ('a' and 'b') is created using Babel types, and the arity of the function is determined using the getFunctionArity utility.

const getFunctionArity = require('babel-helper-get-function-arity');
const t = require('@babel/types');

const func = t.functionDeclaration(
  t.identifier('myFunction'),
  [t.identifier('a'), t.identifier('b')],
  t.blockStatement([])
);

console.log(getFunctionArity(func)); // Output: 2