Package Exports
- util-arity
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (util-arity) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
Arity
Set a functions arity (the argument count) by proxying function calls.
P.S. If you need need to enforce arity and don't care about argument length or this, use nary. It's magnitudes faster than using .apply to proxy arguments.
When would I use this?
It's unlikely you'll need to use this utility in everyday development. The reason I wrote it was for functional utilities and backward compatibility with user expectations. For example, many modules use function arity to decide how the function behaves (e.g. error middleware in express, callbacks in mocha).
Installation
npm install util-arity --saveUsage
var fn = function () {};
var arity = require('util-arity');
var oneArg = arity(1, fn);
var twoArgs = arity(2, fn);
var threeArgs = arity(3, fn);
oneArgs.length; //=> 1
twoArgs.length; //=> 2
threeArgs.length; //=> 3TypeScript
The typings for this project are available for node module resolution with TypeScript.
License
MIT