Index: node_modules/semver/functions/prerelease.js
===================================================================
--- node_modules/semver/functions/prerelease.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/semver/functions/prerelease.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,8 @@
+'use strict'
+
+const parse = require('./parse')
+const prerelease = (version, options) => {
+  const parsed = parse(version, options)
+  return (parsed && parsed.prerelease.length) ? parsed.prerelease : null
+}
+module.exports = prerelease