biobulkbende.org/node_modules/es5-ext/number/is-safe-integer/shim.js

"use strict";

var isInteger = require("../is-integer/shim")
  , maxValue  = require("../max-safe-integer")
  , abs       = Math.abs;

module.exports = function (value) {
	if (!isInteger(value)) return false;
	return abs(value) <= maxValue;
};