fix html serializer default block type logic

src/serializers/html.js

@@ -109,10 +109,16 @@ class Html {
         return memo
       }
 
-      const commonProps = {kind: 'block', nodes: [node]}
-      const block = this.defaultBlockType.typeof === 'string'
-        ? {type: this.defaultBlockType, ...commonProps}
-        : {...commonProps, ...this.defaultBlockType}
+      const { defaultBlockType } = this
+      const defaults = typeof defaultBlockType == 'string'
+        ? { type: defaultBlockType }
+        : defaultBlockType
+
+      const block = {
+        kind: 'block',
+        nodes: [node],
+        ...defaults
+      }
 
       memo.push(block)
       return memo

test/serializers/fixtures/html/deserialize/default-block/index.js

@@ -16,9 +16,9 @@ export default {
     }
   ],
   defaultBlockType: {
-    type: 'contentBlock',
+    type: 'default',
     data: {
-      style: 'default'
+      key: 'value'
     }
   }
 }

test/serializers/fixtures/html/deserialize/default-block/output.yaml

@@ -11,9 +11,10 @@ nodes:
             marks: []
           - text: e
             marks: []
-  - type: contentBlock
+  - type: default
     isVoid: false
-    data: {style: default}
+    data:
+      key: value
     nodes:
       - characters:
           - text: t