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'use strict';
var numberIsNan = require('number-is-nan');
module.exports = function (num) {
if (typeof num !== 'number' || numberIsNan(num)) {
throw new TypeError('Expected a number');
}
var exponent;
var unit;
var neg = num < 0;
var units = ['B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
if (neg) {
num = -num;
}
if (num < 1) {
return (neg ? '-' : '') + num + ' B';
}
exponent = Math.min(Math.floor(Math.log(num) / Math.log(1000)), units.length - 1);
num = (num / Math.pow(1000, exponent)).toFixed(2) * 1;
unit = units[exponent];
return (neg ? '-' : '') + num + ' ' + unit;
};