Accept attribute undefined

1 files changed, 9 insertions, 8 deletions

diff --git a/src/rx.ts b/src/rx.ts
index bf01b6d..2e91e56 100644
--- a/src/rx.ts
+++ b/src/rx.ts
@@ -32,7 +32,8 @@ interface Attributes {
 }
 
 type AttributeValue
-  = string
+  = undefined
+  | string
   | number
   | boolean
   | ((event: Event) => void)
@@ -386,15 +387,15 @@ function appendNode(base: Element, node: Node, lastAdded?: Node) {
 }
 
 function setAttribute(state: State, element: Element, key: string, attribute: AttributeValue) {
-  if (typeof attribute == "boolean") {
-    if (attribute) {
-      // @ts-ignore
-      element[key] = "true"
-    }
-  } else if (typeof attribute == "number") {
+  if (attribute === undefined || attribute === false) {
+    // Do nothing
+  } else if (attribute === true) {
+    // @ts-ignore
+    element[key] = "true"
+  } else if (typeof attribute === "number") {
     // @ts-ignore
     element[key] = attribute.toString()
-  } else if (typeof attribute == "string") {
+  } else if (typeof attribute === "string") {
     // @ts-ignore
     element[key] = attribute
   } else {