get-function-arguments.js

export default getFunctionArguments

var COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg
var ARGUMENTS = /^function\s*[^\(]*\(\s*([^\)]*)\)/m
var COMMA = /,/

/*
 * @param {Function} fn
 * @return {Array<String>}
**/
function getFunctionArguments (fn) {
	switch (fn.length) {
		case 0: return []
		default:
			return fn
				.toString()
				.replace(COMMENTS, '')
				.match(ARGUMENTS)[1]
				.split(COMMA)
				.map(trim)
	}
}

/**
 * @param {String} it
 * @return {String}
**/
function trim (it) {
	return it.trim()
}