diff --git a/src/nodes/comment.ts b/src/nodes/comment.ts
index 13925c2..8ba5ff8 100644
--- a/src/nodes/comment.ts
+++ b/src/nodes/comment.ts
@@ -6,7 +6,7 @@ export default class CommentNode extends Node {
 	public clone(): CommentNode {
 		return new CommentNode(this.rawText, null);
 	}
-	public constructor(public rawText: string, parentNode: HTMLElement, range?: [number, number]) {
+	public constructor(public rawText: string, parentNode = null as HTMLElement | null, range?: [number, number]) {
 		super(parentNode, range);
 	}
 
diff --git a/src/nodes/html.ts b/src/nodes/html.ts
index 273f1cb..4c75e33 100644
--- a/src/nodes/html.ts
+++ b/src/nodes/html.ts
@@ -172,7 +172,7 @@ export default class HTMLElement extends Node {
 		tagName: string,
 		keyAttrs: KeyAttributes,
 		public rawAttrs = '',
-		parentNode: HTMLElement | null,
+		parentNode = null as HTMLElement | null,
 		range: [number, number],
 		private voidTag = new VoidTag(),
 		_parseOptions = {} as Partial<Options>
diff --git a/src/nodes/text.ts b/src/nodes/text.ts
index 3ed36b7..0eb9cd5 100644
--- a/src/nodes/text.ts
+++ b/src/nodes/text.ts
@@ -11,7 +11,7 @@ export default class TextNode extends Node {
 	public clone(): TextNode {
 		return new TextNode(this._rawText, null);
 	}
-	public constructor(rawText: string, parentNode: HTMLElement, range?: [number, number]) {
+	public constructor(rawText: string, parentNode = null as HTMLElement | null, range?: [number, number]) {
 		super(parentNode, range);
 		this._rawText = rawText;
 	}