1 // `Math.sign` method implementation
2 // https://tc39.es/ecma262/#sec-math.sign
3 // eslint-disable-next-line es/no-math-sign -- safe
4 module.exports = Math.sign || function sign(x) {
5 // eslint-disable-next-line no-self-compare -- NaN check
6 return (x = +x) == 0 || x != x ? x : x < 0 ? -1 : 1;