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node_modules/is-number/index.js

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+/*!
+ * is-number <https://github.com/jonschlinkert/is-number>
+ *
+ * Copyright (c) 2014-2015, Jon Schlinkert.
+ * Licensed under the MIT License.
+ */
+
+'use strict';
+
+var typeOf = require('kind-of');
+
+module.exports = function isNumber(num) {
+  var type = typeOf(num);
+  if (type !== 'number' && type !== 'string') {
+    return false;
+  }
+  var n = +num;
+  return (n - n + 1) >= 0 && num !== '';
+};