Clarify error message in isSerializableProps

vercel · Mar 7, 2021 · e896570 · e896570
1 parent 33255b7
commit e896570
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/packages/next/lib/is-serializable-props.ts b/packages/next/lib/is-serializable-props.ts
@@ -1,7 +1,11 @@
 const regexpPlainIdentifier = /^[A-Za-z_$][A-Za-z0-9_$]*$/
 
+function getObjectClassLabel(value: any): string {
+  return Object.prototype.toString.call(value)
+}
+
 function isPlainObject(value: any): boolean {
-  if (Object.prototype.toString.call(value) !== '[object Object]') {
+  if (getObjectClassLabel(value) !== '[object Object]') {
     return false
   }
 
@@ -19,7 +23,7 @@ export function isSerializableProps(
       page,
       method,
       '',
-      `Props must be returned as a plain object from ${method}: \`{ props: { ... } }\`.`
+      `Props must be returned as a plain object from ${method}: \`{ props: { ... } }\` (received: \`${getObjectClassLabel(input)}\`).`
     )
   }