From 9da84cc5d76199882ba6a23b2543ce79fd77d191 Mon Sep 17 00:00:00 2001
From: Max Mumford <maxmumford@gmail.com>
Date: Tue, 29 Oct 2019 18:26:29 +0000
Subject: [PATCH] Add end method to d3 transition (#39355)

---
 types/d3-transition/d3-transition-tests.ts | 3 +++
 types/d3-transition/index.d.ts             | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/types/d3-transition/d3-transition-tests.ts b/types/d3-transition/d3-transition-tests.ts
index 19f05ec9c3..b3d8633a5f 100644
--- a/types/d3-transition/d3-transition-tests.ts
+++ b/types/d3-transition/d3-transition-tests.ts
@@ -421,6 +421,9 @@ if (listener) {
 // remove listener
 enterTransition = enterTransition.on('end', null); // check chaining return type by re-assigning
 
+// check end method exists
+enterTransition.end();
+
 // --------------------------------------------------------------------------
 // Test Control Flow
 // --------------------------------------------------------------------------
diff --git a/types/d3-transition/index.d.ts b/types/d3-transition/index.d.ts
index caff3a4112..64feb4f0a8 100644
--- a/types/d3-transition/index.d.ts
+++ b/types/d3-transition/index.d.ts
@@ -456,6 +456,11 @@ export interface Transition<GElement extends BaseType, Datum, PElement extends B
      */
     on(type: string, listener: ValueFn<GElement, Datum, void>): this;
 
+    /**
+     * Returns a promise that resolves when every selected element finishes transitioning. If any element’s transition is cancelled or interrupted, the promise rejects.
+     */
+    end(): Promise<void>;
+
     // Control Flow ----------------------
 
     /**