From a0f465c32255bb88cae60d26d621f7c877bb2984 Mon Sep 17 00:00:00 2001
From: Sebastian Schmidt <mrschmidt@google.com>
Date: Tue, 16 Jun 2020 12:28:07 -0700
Subject: [PATCH 1/2] Allow undefined callback functions in Storage Observer

---
 packages/firebase/index.d.ts      | 2 +-
 packages/storage-types/index.d.ts | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/firebase/index.d.ts b/packages/firebase/index.d.ts
index 93df8ad400f..f5b4a17042c 100644
--- a/packages/firebase/index.d.ts
+++ b/packages/firebase/index.d.ts
@@ -7579,7 +7579,7 @@ declare namespace firebase.storage {
     on(
       event: firebase.storage.TaskEvent,
       nextOrObserver?:
-        | firebase.Observer<UploadTaskSnapshot>
+        | Partial<firebase.Observer<UploadTaskSnapshot>>
         | null
         | ((a: UploadTaskSnapshot) => any),
       error?: ((a: Error) => any) | null,
diff --git a/packages/storage-types/index.d.ts b/packages/storage-types/index.d.ts
index 4aa67a6c8bd..902461581cc 100644
--- a/packages/storage-types/index.d.ts
+++ b/packages/storage-types/index.d.ts
@@ -91,7 +91,7 @@ export interface UploadTask {
   on(
     event: TaskEvent,
     nextOrObserver?:
-      | Observer<UploadTaskSnapshot>
+      | Partial<Observer<UploadTaskSnapshot>>
       | null
       | ((a: UploadTaskSnapshot) => any),
     error?: ((a: Error) => any) | null,

From fac628168cf2a1f427f6b716c6bfc38e3aa26fa4 Mon Sep 17 00:00:00 2001
From: Sebastian Schmidt <mrschmidt@google.com>
Date: Thu, 9 Jul 2020 11:27:55 -0700
Subject: [PATCH 2/2] Create popular-cups-melt.md

---
 .changeset/popular-cups-melt.md | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 .changeset/popular-cups-melt.md

diff --git a/.changeset/popular-cups-melt.md b/.changeset/popular-cups-melt.md
new file mode 100644
index 00000000000..b5b662a6337
--- /dev/null
+++ b/.changeset/popular-cups-melt.md
@@ -0,0 +1,7 @@
+---
+"firebase": patch
+"@firebase/storage-types": patch
+"@firebase/storage": patch
+---
+
+[fix] Updated the TypeScript types for all APIs using Observers to allow callback omission.