--- /dev/null
+'use strict';
+module.exports = x => {
+ if (typeof x !== 'string') {
+ throw new TypeError('Expected a string, got ' + typeof x);
+ }
+
+ // Catches EFBBBF (UTF-8 BOM) because the buffer-to-string
+ // conversion translates it to FEFF (UTF-16 BOM)
+ if (x.charCodeAt(0) === 0xFEFF) {
+ return x.slice(1);
+ }
+
+ return x;
+};