extract-opts
Extract the options and callback from a function's arguments easily
assert-args
Validate and format function arguments ( handles types and optionals)
pfn
Possible Function. Wraps what might be a function, with fallback behavior in case it’s not. Perfect for use in functions that accept optional callback arguments.
optional-args
Wraps a function whose last argument is preceded by optional arguments so that when fewer arguments are passed in, missing optional arguments are filled in as `undefined`.
arguer
Normalizes arguments for JavaScript functions with optional arguments and provides optional typing.
