fix: serialize regexpes properly in the server-side config

Fixes #307

lib/templates/options.ejs

@@ -1,17 +1,7 @@
 /* eslint-disable */
 <%
-function stringifyValue(value) {
-  if (typeof value === 'string') {
-    return `'${value}'`
-  } else if (value === undefined || value === null || typeof value === 'boolean' || typeof value === 'function') {
-    return String(value);
-  } else {
-    return JSON.stringify(value)
-  }
-}
-
 for (const [key, value] of Object.entries(options)) {
-%>export const <%= key %> = <%= stringifyValue(value) %>
+%>export const <%= key %> = <%= serialize(value) %>
 <%
 }
 %>