diff --git a/packages/dom/README.md b/packages/dom/README.md
index c1f86f4010a843..c6b0cb07cba203 100644
--- a/packages/dom/README.md
+++ b/packages/dom/README.md
@@ -138,11 +138,11 @@ Given a DOM node, finds the closest scrollable container node.
 
 _Parameters_
 
--   _node_ `Element`: Node from which to start.
+-   _node_ `Element | null`: Node from which to start.
 
 _Returns_
 
--   `?Element`: Scrollable container node, if found.
+-   `Element | undefined`: Scrollable container node, if found.
 
 <a name="insertAfter" href="#insertAfter">#</a> **insertAfter**
 
diff --git a/packages/dom/src/dom/get-scroll-container.js b/packages/dom/src/dom/get-scroll-container.js
index 995db7431db826..0c5ac53cab113d 100644
--- a/packages/dom/src/dom/get-scroll-container.js
+++ b/packages/dom/src/dom/get-scroll-container.js
@@ -6,13 +6,13 @@ import getComputedStyle from './get-computed-style';
 /**
  * Given a DOM node, finds the closest scrollable container node.
  *
- * @param {Element} node Node from which to start.
+ * @param {Element | null} node Node from which to start.
  *
- * @return {?Element} Scrollable container node, if found.
+ * @return {Element | undefined} Scrollable container node, if found.
  */
 export default function getScrollContainer( node ) {
 	if ( ! node ) {
-		return;
+		return undefined;
 	}
 
 	// Scrollable if scrollable height exceeds displayed...
@@ -25,5 +25,5 @@ export default function getScrollContainer( node ) {
 	}
 
 	// Continue traversing
-	return getScrollContainer( node.parentNode );
+	return getScrollContainer( /** @type {Element} */ ( node.parentNode ) );
 }
diff --git a/packages/dom/src/dom/input-field-has-uncollapsed-selection.js b/packages/dom/src/dom/input-field-has-uncollapsed-selection.js
index 41835fb1899d7e..05f7fe1d2ab7ff 100644
--- a/packages/dom/src/dom/input-field-has-uncollapsed-selection.js
+++ b/packages/dom/src/dom/input-field-has-uncollapsed-selection.js
@@ -22,7 +22,10 @@ export default function inputFieldHasUncollapsedSelection( element ) {
 		return false;
 	}
 	try {
-		const { selectionStart, selectionEnd } = element;
+		const {
+			selectionStart,
+			selectionEnd,
+		} = /** @type {HTMLInputElement | HTMLTextAreaElement} */ ( element );
 
 		return selectionStart !== null && selectionStart !== selectionEnd;
 	} catch ( error ) {
diff --git a/packages/dom/src/dom/replace-tag.js b/packages/dom/src/dom/replace-tag.js
index dc70cf922c64a6..9bb74e9a631d51 100644
--- a/packages/dom/src/dom/replace-tag.js
+++ b/packages/dom/src/dom/replace-tag.js
@@ -1,3 +1,8 @@
+/**
+ * Internal dependencies
+ */
+import { assertIsDefined } from '../utils/assert-is-defined';
+
 /**
  * Replaces the given node with a new node with the given tag name.
  *
@@ -13,6 +18,7 @@ export default function replaceTag( node, tagName ) {
 		newNode.appendChild( node.firstChild );
 	}
 
+	assertIsDefined( node.parentNode, 'node.parentNode' );
 	node.parentNode.replaceChild( newNode, node );
 
 	return newNode;
diff --git a/packages/dom/src/dom/replace.js b/packages/dom/src/dom/replace.js
index ab9b05df3a08a8..e0591e464ed60a 100644
--- a/packages/dom/src/dom/replace.js
+++ b/packages/dom/src/dom/replace.js
@@ -1,6 +1,7 @@
 /**
  * Internal dependencies
  */
+import { assertIsDefined } from '../utils/assert-is-defined';
 import insertAfter from './insert-after';
 import remove from './remove';
 
@@ -12,6 +13,7 @@ import remove from './remove';
  * @return {void}
  */
 export default function replace( processedNode, newNode ) {
+	assertIsDefined( processedNode.parentNode, 'processedNode.parentNode' );
 	insertAfter( newNode, processedNode.parentNode );
 	remove( processedNode );
 }
diff --git a/packages/dom/src/dom/wrap.js b/packages/dom/src/dom/wrap.js
index 725a71f6c4b928..5cc9a7af243831 100644
--- a/packages/dom/src/dom/wrap.js
+++ b/packages/dom/src/dom/wrap.js
@@ -1,3 +1,8 @@
+/**
+ * Internal dependencies
+ */
+import { assertIsDefined } from '../utils/assert-is-defined';
+
 /**
  * Wraps the given node with a new node with the given tag name.
  *
@@ -5,6 +10,7 @@
  * @param {Element} referenceNode The node to wrap.
  */
 export default function wrap( newNode, referenceNode ) {
+	assertIsDefined( referenceNode.parentNode, 'referenceNode.parentNode' );
 	referenceNode.parentNode.insertBefore( newNode, referenceNode );
 	newNode.appendChild( referenceNode );
 }
diff --git a/packages/dom/tsconfig.json b/packages/dom/tsconfig.json
index 2c690ac4e0e7d7..8e47a4759dd01c 100644
--- a/packages/dom/tsconfig.json
+++ b/packages/dom/tsconfig.json
@@ -15,7 +15,9 @@
 		"src/dom/get-computed-style.js",
 		"src/dom/get-range-height.js",
 		"src/dom/get-rectangle-from-range.js",
+		"src/dom/get-scroll-container.js",
 		"src/dom/hidden-caret-range-from-point.js",
+		"src/dom/input-field-has-uncollapsed-selection.js",
 		"src/dom/is-edge.js",
 		"src/dom/is-empty.js",
 		"src/dom/is-element.js",
@@ -24,13 +26,17 @@
 		"src/dom/is-number-input.js",
 		"src/dom/is-text-field.js",
 		"src/dom/is-selection-forward.js",
+		"src/dom/is-vertical-edge.js",
 		"src/dom/insert-after.js",
 		"src/dom/remove-invalid-html.js",
 		"src/dom/place-caret-at-horizontal-edge.js",
 		"src/dom/place-caret-at-vertical-edge.js",
 		"src/dom/remove.js",
 		"src/dom/strip-html.js",
+		"src/dom/replace-tag.js",
+		"src/dom/replace.js",
 		"src/dom/unwrap.js",
+		"src/dom/wrap.js",
 		"src/utils/**/*",
 		"src/focusable.js",
 		"src/phrasing-content.js",