1 files changed, 55 insertions, 0 deletions
diff --git a/packages/webapi/src/lib/TreeWalker.ts b/packages/webapi/src/lib/TreeWalker.ts
new file mode 100644
index 000000000..86e32ff20
--- /dev/null
+++ b/packages/webapi/src/lib/TreeWalker.ts
@@ -0,0 +1,55 @@
+import * as _ from './utils'
+
+export class TreeWalker {
+	parentNode(): Node | null {
+		return null
+	}
+
+	firstChild(): Node | null {
+		return null
+	}
+
+	lastChild(): Node | null {
+		return null
+	}
+
+	previousSibling(): Node | null {
+		return null
+	}
+
+	nextSibling(): Node | null {
+		return null
+	}
+
+	previousNode(): Node | null {
+		return null
+	}
+
+	nextNode(): Node | null {
+		return null
+	}
+
+	get currentNode(): Node {
+		const internals = _.internalsOf<TreeWalkerInternals>(this, 'TreeWalker', 'currentNode')
+		return internals.currentNode
+	}
+
+	get root(): Node {
+		const internals = _.internalsOf<TreeWalkerInternals>(this, 'TreeWalker', 'root')
+		return internals.root
+	}
+
+	get whatToShow(): number {
+		const internals = _.internalsOf<TreeWalkerInternals>(this, 'TreeWalker', 'whatToShow')
+		return internals.whatToShow
+	}
+}
+
+_.allowStringTag(TreeWalker)
+
+export interface TreeWalkerInternals {
+	filter: NodeFilter
+	currentNode: Node
+	root: Node
+	whatToShow: number
+}