diff --git a/data-extraction/src/CommonDataTypes.ts b/data-extraction/src/CommonDataTypes.ts
index f3dd9ae..e1d2015 100644
--- a/data-extraction/src/CommonDataTypes.ts
+++ b/data-extraction/src/CommonDataTypes.ts
@@ -9,6 +9,7 @@ export type KnownVisualizationData =
 	| GridVisualizationData
 	| ImageVisualizationData
 	| MonacoTextVisualizationData
+	| MonacoTextDiffVisualizationData
 	| TableVisualizationData
 	| PlotlyVisualizationData
 	| SimpleTextVisualizationData
@@ -162,6 +163,24 @@ export type MonacoTextVisualizationData = {
 	fileName?: string;
 };
 
+export type MonacoTextDiffVisualizationData = {
+	kind: {
+		text: true;
+	};
+	/**
+	 * The text to show
+	 */
+	text: string;
+	/**
+	 * The text to compare against
+	 */
+	otherText: string;
+	/**
+	 * An optional filename that might be used for chosing a syntax highlighter
+	 */
+	fileName?: string;
+};
+
 export type TableVisualizationData = {
 	kind: {
 		table: true;