Fix issue with Preact 6.1+ and the JSX mode where object values for the class prop were serialized as objects instead of their normalized string form

Author: developit

src/index.js

@@ -113,12 +113,6 @@ export default function renderToString(vnode, context, opts, inner) {
 			if (name==='children') continue;
 			if (!(opts && opts.allAttributes) && (name==='key' || name==='ref')) continue;
 
-			let hooked = opts.attributeHook && opts.attributeHook(name, v, context, opts, isComponent);
-			if (hooked || hooked==='') {
-				s += hooked;
-				continue;
-			}
-
 			if (name==='className') {
 				if (attributes['class']) continue;
 				name = 'class';
@@ -131,6 +125,12 @@ export default function renderToString(vnode, context, opts, inner) {
 				v = styleObjToCss(v);
 			}
 
+			let hooked = opts.attributeHook && opts.attributeHook(name, v, context, opts, isComponent);
+			if (hooked || hooked==='') {
+				s += hooked;
+				continue;
+			}
+
 			if (name==='dangerouslySetInnerHTML') {
 				html = v && v.__html;
 			}