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// Promisify asynchronous function
"use strict";
var isValue = require("es5-ext/object/is-value")
, callable = require("es5-ext/object/valid-callable")
, toNaturalNumber = require("es5-ext/number/to-pos-integer")
, callAsync = require("./call-async")._base;
module.exports = function (length) {
var fn, result;
fn = callable(this);
if (fn.returnsPromise) return fn;
if (isValue(length)) length = toNaturalNumber(length);
result = function () { return callAsync(fn, length, this, arguments); };
result.returnsPromise = true;
return result;
};
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