:recycle: Tweak class concat code to avoid leading whitespace.

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/src/runtime.ffi.mjs b/lib/src/runtime.ffi.mjs
index 1d25d6f..3fc0d91 100644
--- a/lib/src/runtime.ffi.mjs
+++ b/lib/src/runtime.ffi.mjs
@@ -43,7 +43,9 @@ function createElement(prev, curr, ns, parent = null) {
     morphAttr(
       el,
       attr.head[0],
-      attr.head[0] === "class" ? `${el.className}{attr.head[1]}` : attr.head[1]
+      attr.head[0] === "class" && el.className
+        ? `${el.className} ${attr.head[1]}`
+        : attr.head[1]
     );
 
     attr = attr.tail;
@@ -77,6 +79,7 @@ function createElement(prev, curr, ns, parent = null) {
 
     if (prev) prev.replaceWith(el);
   }
+
   return el;
 }
 
@@ -88,8 +91,8 @@ function morphElement(prev, curr, ns, parent) {
   while (currAttr.head) {
     currAttrs.set(
       currAttr.head[0],
-      currAttr.head[0] === "class"
-        ? `${prev.className} {currAttr.head[1]}`
+      currAttr.head[0] === "class" && prev.className
+        ? `${prev.className} ${currAttr.head[1]}`
         : currAttr.head[1]
     );