diff --git a/types/base.d.ts b/types/base.d.ts
index 78884fbaf..a619b71c2 100644
--- a/types/base.d.ts
+++ b/types/base.d.ts
@@ -71,6 +71,10 @@ export interface AssertContext {
 	 * Assert that contents matches regex.
 	 */
 	regex(contents: string, regex: RegExp, message?: string): void;
+	/**
+	 * Assert that contents matches a snapshot.
+	 */
+	snapshot(contents: any, message?: string): void;
 	/**
 	 * Assert that contents does not match regex.
 	 */