chore: remove unused node

Author: boojack

ast/ast.go

@@ -11,7 +11,6 @@ const (
 	HorizontalRuleNode    NodeType = "HORIZONTAL_RULE"
 	BlockquoteNode        NodeType = "BLOCKQUOTE"
 	ListNode              NodeType = "LIST"
-	ListItemNode          NodeType = "LIST_ITEM"
 	OrderedListItemNode   NodeType = "ORDERED_LIST_ITEM"
 	UnorderedListItemNode NodeType = "UNORDERED_LIST_ITEM"
 	TaskListItemNode      NodeType = "TASK_LIST_ITEM"
@@ -55,7 +54,7 @@ type BaseNode struct {
 
 func IsBlockNode(node Node) bool {
 	switch node.Type() {
-	case ParagraphNode, CodeBlockNode, HeadingNode, HorizontalRuleNode, BlockquoteNode, ListNode, ListItemNode, OrderedListItemNode, UnorderedListItemNode, TaskListItemNode, TableNode, EmbeddedContentNode:
+	case ParagraphNode, CodeBlockNode, HeadingNode, HorizontalRuleNode, BlockquoteNode, ListNode, OrderedListItemNode, UnorderedListItemNode, TaskListItemNode, TableNode, EmbeddedContentNode:
 		return true
 	default:
 		return false

ast/block.go

@@ -131,21 +131,8 @@ func (n *List) Restore() string {
 	return result
 }
 
-type ListItem struct {
-	BaseBlock
-}
-
-func (*ListItem) Type() NodeType {
-	return ListItemNode
-}
-
-func (*ListItem) Restore() string {
-	// Should be overridden.
-	return ""
-}
-
 type OrderedListItem struct {
-	ListItem
+	BaseBlock
 
 	// Number is the number of the list.
 	Number string
@@ -167,7 +154,7 @@ func (n *OrderedListItem) Restore() string {
 }
 
 type UnorderedListItem struct {
-	ListItem
+	BaseBlock
 
 	// Symbol is "*" or "-" or "+".
 	Symbol string
@@ -189,7 +176,7 @@ func (n *UnorderedListItem) Restore() string {
 }
 
 type TaskListItem struct {
-	ListItem
+	BaseBlock
 
 	// Symbol is "*" or "-" or "+".
 	Symbol string