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