yhtml5-test/demo/node_modules/core-js/library/modules/$.math-sign.js

A test framework for front-end projects

// 20.2.2.28 Math.sign(x)
module.exports = Math.sign || function sign(x){
  return (x = +x) == 0 || x != x ? x : x < 0 ? -1 : 1;
};