From a11d3753322e4b8cdcc11b902b00f4f31f92143f Mon Sep 17 00:00:00 2001
From: Theo Browne <me@t3.gg>
Date: Thu, 30 Jul 2026 01:40:07 -0700
Subject: [PATCH] fix(mobile): stop shared content errors in Personal Team
 builds

---
 .../sharing/IncomingShareProvider.tsx         |  8 +++-
 .../sharing/incoming-share-native.test.ts     | 46 +++++++++++++++++++
 .../features/sharing/incoming-share-native.ts | 37 +++++++++++++++
 3 files changed, 90 insertions(+), 1 deletion(-)
 create mode 100644 apps/mobile/src/features/sharing/incoming-share-native.test.ts
 create mode 100644 apps/mobile/src/features/sharing/incoming-share-native.ts

diff --git a/apps/mobile/src/features/sharing/IncomingShareProvider.tsx b/apps/mobile/src/features/sharing/IncomingShareProvider.tsx
index 04d371e5d2f..9203e665190 100644
--- a/apps/mobile/src/features/sharing/IncomingShareProvider.tsx
+++ b/apps/mobile/src/features/sharing/IncomingShareProvider.tsx
@@ -15,6 +15,7 @@ import {
   type IncomingShareDestination,
   type IncomingShareDraft,
 } from "./incoming-share-model";
+import { createIncomingSharePayloadReader } from "./incoming-share-native";
 import { IncomingShareInbox } from "./incoming-share-inbox";
 import {
   loadIncomingShareDrafts,
@@ -48,6 +49,11 @@ function receiveSharingEnabled(): boolean {
   return Constants.expoConfig?.extra?.iosPersonalTeamBuild !== true;
 }
 
+const getIncomingSharePayloads = createIncomingSharePayloadReader({
+  platform: Platform.OS,
+  readPayloads: getSharedPayloads,
+});
+
 async function resolvedPayloadsForImages(): Promise<ReadonlyArray<ResolvedSharePayload>> {
   try {
     return await getResolvedSharedPayloadsAsync();
@@ -121,7 +127,7 @@ const incomingShareInbox = new IncomingShareInbox({
   loadDrafts: loadIncomingShareDrafts,
   writeDraft: writeIncomingShareDraft,
   removeDraft: removeIncomingShareDraft,
-  getPayloads: getSharedPayloads,
+  getPayloads: getIncomingSharePayloads,
   clearPayloads: clearSharedPayloads,
   buildDraft: async ({ payloads, id, createdAt }) => {
     const cleanupUris = new Set<string>();
diff --git a/apps/mobile/src/features/sharing/incoming-share-native.test.ts b/apps/mobile/src/features/sharing/incoming-share-native.test.ts
new file mode 100644
index 00000000000..8511f61ffa2
--- /dev/null
+++ b/apps/mobile/src/features/sharing/incoming-share-native.test.ts
@@ -0,0 +1,46 @@
+import { describe, expect, it, vi } from "@effect/vitest";
+import type { SharePayload } from "expo-sharing";
+
+import { createIncomingSharePayloadReader } from "./incoming-share-native";
+
+const PAYLOAD: SharePayload = {
+  shareType: "text",
+  mimeType: "text/plain",
+  value: "Fix this",
+};
+
+describe("createIncomingSharePayloadReader", () => {
+  it("treats a missing iOS App Group as an unavailable inbox", () => {
+    const readPayloads = vi.fn((): ReadonlyArray<SharePayload> => {
+      throw Object.assign(new Error("Expo-sharing has failed to fetch the app group id"), {
+        code: "ERR_FAILED_TO_RESOLVE_APP_GROUP_ID",
+      });
+    });
+    const read = createIncomingSharePayloadReader({ platform: "ios", readPayloads });
+
+    expect(read()).toEqual([]);
+    expect(read()).toEqual([]);
+    expect(readPayloads).toHaveBeenCalledTimes(1);
+  });
+
+  it("returns native payloads when receiving is available", () => {
+    const read = createIncomingSharePayloadReader({
+      platform: "ios",
+      readPayloads: () => [PAYLOAD],
+    });
+
+    expect(read()).toEqual([PAYLOAD]);
+  });
+
+  it("preserves other native errors", () => {
+    const error = new Error("native failure");
+    const read = createIncomingSharePayloadReader({
+      platform: "ios",
+      readPayloads: () => {
+        throw error;
+      },
+    });
+
+    expect(read).toThrow(error);
+  });
+});
diff --git a/apps/mobile/src/features/sharing/incoming-share-native.ts b/apps/mobile/src/features/sharing/incoming-share-native.ts
new file mode 100644
index 00000000000..b6da9534c92
--- /dev/null
+++ b/apps/mobile/src/features/sharing/incoming-share-native.ts
@@ -0,0 +1,37 @@
+import type { SharePayload } from "expo-sharing";
+
+const IOS_APP_GROUP_UNAVAILABLE_ERROR_CODE = "ERR_FAILED_TO_RESOLVE_APP_GROUP_ID";
+
+function errorCode(error: unknown): string | null {
+  if (typeof error !== "object" || error === null || !("code" in error)) {
+    return null;
+  }
+  return typeof error.code === "string" ? error.code : null;
+}
+
+/**
+ * Normalizes the native "share into" capability to an empty inbox. Personal
+ * Team builds cannot include the App Group that expo-sharing reads from.
+ */
+export function createIncomingSharePayloadReader(input: {
+  readonly platform: string;
+  readonly readPayloads: () => ReadonlyArray<SharePayload>;
+}): () => ReadonlyArray<SharePayload> {
+  let isUnavailable = false;
+
+  return () => {
+    if (isUnavailable) {
+      return [];
+    }
+
+    try {
+      return input.readPayloads();
+    } catch (error) {
+      if (input.platform === "ios" && errorCode(error) === IOS_APP_GROUP_UNAVAILABLE_ERROR_CODE) {
+        isUnavailable = true;
+        return [];
+      }
+      throw error;
+    }
+  };
+}