feat(auth): legacyFetchSignInWithEmail config option for users still wishing to use auth.fetchSignInWithEmail()

.github/workflows/scripts/prepare-ios-simulator.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+if [[ -z "${IOS_SIMULATOR_DEVICE:-}" ]]; then
+  echo "IOS_SIMULATOR_DEVICE must be set."
+  exit 1
+fi
+
+echo "--- Available simulators (diagnostic) ---"
+xcrun simctl list
+
+SIMULATOR_UDID="$(python3 - <<'PY'
+import json
+import os
+import re
+import subprocess
+import sys
+
+target_name = os.environ["IOS_SIMULATOR_DEVICE"]
+raw = subprocess.check_output(
+    ["xcrun", "simctl", "list", "devices", "available", "-j"],
+    text=True,
+)
+devices_by_runtime = json.loads(raw)["devices"]
+pattern = re.compile(r"com\.apple\.CoreSimulator\.SimRuntime\.iOS-(\d+)(?:-(\d+))?")
+
+candidates = []
+for runtime_key, devices in devices_by_runtime.items():
+    match = pattern.fullmatch(runtime_key)
+    if not match:
+        continue
+
+    version = (int(match.group(1)), int(match.group(2) or 0))
+    for device in devices:
+        if device.get("isAvailable") and device.get("name") == target_name:
+            candidates.append((version, device["udid"]))
+
+if not candidates:
+    sys.exit(f"No available simulator found for {target_name} in installed iOS runtimes.")
+
+candidates.sort(reverse=True)
+print(candidates[0][1])
+PY
+)"
+
+if [[ -n "${GITHUB_OUTPUT:-}" ]]; then
+  echo "udid=$SIMULATOR_UDID" >> "$GITHUB_OUTPUT"
+else
+  echo "Resolved simulator UDID: $SIMULATOR_UDID"
+fi
+
+if ! boot_output="$(xcrun simctl boot "$SIMULATOR_UDID" 2>&1)"; then
+  if [[ "$boot_output" != *"Unable to boot device in current state: Booted"* ]]; then
+    echo "$boot_output"
+    exit 1
+  fi
+fi
+
+xcrun simctl bootstatus "$SIMULATOR_UDID" -b

.github/workflows/swiftui-auth.yml

@@ -23,6 +23,10 @@ on:
 permissions:
   contents: read
 
+env:
+  XCODE_VERSION: latest-stable
+  IOS_SIMULATOR_DEVICE: iPhone 17 Pro
+
 jobs:
   format-check:
     name: Swift Format Check
@@ -37,7 +41,7 @@ jobs:
       - name: Check Swift formatting
         run: bash lint-swift.sh
 
-  # Package Unit Tests (standalone, no emulator needed)
+  # Package Unit Tests (simulator-backed)
   unit-tests:
     name: Package Unit Tests
     runs-on: macos-26
@@ -48,15 +52,20 @@ jobs:
       - name: Install xcpretty
         run: gem install xcpretty
 
-      - name: Select Xcode version
-        run: sudo xcode-select -switch /Applications/Xcode_26.4.app/Contents/Developer
+      - uses: maxim-lobanov/setup-xcode@ed7a3b1fda3918c0306d1b724322adc0b8cc0a90
+        with:
+          xcode-version: ${{ env.XCODE_VERSION }}
+
+      - name: Prepare iOS Simulator
+        id: prepare-simulator
+        run: ./.github/workflows/scripts/prepare-ios-simulator.sh
 
       - name: Run FirebaseSwiftUI Package Unit Tests
         run: |
           set -o pipefail
           xcodebuild test \
             -scheme FirebaseUI-Package \
-            -destination 'platform=iOS Simulator,OS=26.4,name=iPhone 17' \
+            -destination "id=${{ steps.prepare-simulator.outputs.udid }}" \
             -enableCodeCoverage YES \
             -resultBundlePath FirebaseSwiftUIPackageTests.xcresult | tee FirebaseSwiftUIPackageTests.log | xcpretty --test --color --simple
 
@@ -104,25 +113,22 @@ jobs:
       - name: Install xcpretty
         run: gem install xcpretty
 
-      - name: Select Xcode version
-        run: sudo xcode-select -switch /Applications/Xcode_26.4.app/Contents/Developer
-
-      - name: Build for Integration Tests
-        run: |
-          cd ./e2eTest/FirebaseSwiftUIExample
-          set -o pipefail
-          xcodebuild build-for-testing \
-            -scheme FirebaseSwiftUIExampleTests \
-            -destination 'platform=iOS Simulator,OS=26.4,name=iPhone 17' \
-            -enableCodeCoverage YES | xcpretty --color --simple
-
+      - uses: maxim-lobanov/setup-xcode@ed7a3b1fda3918c0306d1b724322adc0b8cc0a90
+        with:
+          xcode-version: ${{ env.XCODE_VERSION }}
+
+      - name: Prepare iOS Simulator
+        id: prepare-simulator
+        run: ./.github/workflows/scripts/prepare-ios-simulator.sh
+
       - name: Run Integration Tests
         run: |
           cd ./e2eTest/FirebaseSwiftUIExample
           set -o pipefail
-          xcodebuild test-without-building \
+          xcodebuild test \
             -scheme FirebaseSwiftUIExampleTests \
-            -destination 'platform=iOS Simulator,OS=26.4,name=iPhone 17' \
+            -destination "id=${{ steps.prepare-simulator.outputs.udid }}" \
+            -parallel-testing-enabled NO \
             -enableCodeCoverage YES \
             -resultBundlePath FirebaseSwiftUIExampleTests.xcresult | tee FirebaseSwiftUIExampleTests.log | xcpretty --test --color --simple
 
@@ -170,16 +176,21 @@ jobs:
       - name: Install xcpretty
         run: gem install xcpretty
 
-      - name: Select Xcode version
-        run: sudo xcode-select -switch /Applications/Xcode_26.4.app/Contents/Developer
+      - uses: maxim-lobanov/setup-xcode@ed7a3b1fda3918c0306d1b724322adc0b8cc0a90
+        with:
+          xcode-version: ${{ env.XCODE_VERSION }}
 
+      - name: Prepare iOS Simulator
+        id: prepare-simulator
+        run: ./.github/workflows/scripts/prepare-ios-simulator.sh
+
       - name: Build for UI Tests
         run: |
           cd ./e2eTest/FirebaseSwiftUIExample
           set -o pipefail
           xcodebuild build-for-testing \
             -scheme FirebaseSwiftUIExampleUITests \
-            -destination 'platform=iOS Simulator,OS=26.4,name=iPhone 17' \
+            -destination "id=${{ steps.prepare-simulator.outputs.udid }}" \
             -enableCodeCoverage YES | xcpretty --color --simple
 
       - name: Run UI Tests
@@ -188,7 +199,7 @@ jobs:
           set -o pipefail
           xcodebuild test-without-building \
             -scheme FirebaseSwiftUIExampleUITests \
-            -destination 'platform=iOS Simulator,OS=26.4,name=iPhone 17' \
+            -destination "id=${{ steps.prepare-simulator.outputs.udid }}" \
             -parallel-testing-enabled NO \
             -enableCodeCoverage YES \
             -resultBundlePath FirebaseSwiftUIExampleUITests.xcresult | tee FirebaseSwiftUIExampleUITests.log | xcpretty --test --color --simple

.gitignore

@@ -29,4 +29,4 @@ Pods/
 Podfile.lock
 *.xcworkspace/
 samples/**/GoogleService-Info.plist
-e2eTest/FirebaseSwiftUIExample/FirebaseSwiftUIExampleUITests.xcresult/
+e2eTest/FirebaseSwiftUIExample/*.xcresult/

FirebaseSwiftUI/FirebaseAppleSwiftUI/Sources/Views/SignInWithAppleButton.swift

@@ -47,14 +47,13 @@ extension SignInWithAppleButton: View {
             return
           }
         } catch {
-          reportError?(error)
-
           if case let AuthServiceError.accountConflict(ctx) = error,
              let onConflict = accountConflictHandler {
             onConflict(ctx)
             return
           }
 
+          reportError?(error)
           throw error
         }
       }

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/AuthServiceError.swift

@@ -164,6 +164,7 @@ public enum AuthServiceError: LocalizedError {
   case invalidCredentials(String)
   case signInFailed(underlying: Error)
   case accountConflict(AccountConflictContext)
+  case legacySignInRecoveryPresented
   case providerNotFound(String)
   case multiFactorAuth(String)
   case rootViewControllerNotFound(String)
@@ -200,6 +201,8 @@ public enum AuthServiceError: LocalizedError {
       return description
     case let .accountConflict(context):
       return context.errorDescription
+    case .legacySignInRecoveryPresented:
+      return nil
     case let .providerNotFound(description):
       return description
     case let .multiFactorAuth(description):

FirebaseSwiftUI/FirebaseAuthSwiftUI/Sources/Services/AuthConfiguration.swift

@@ -22,6 +22,7 @@ public struct AuthConfiguration {
   public let shouldHideCancelButton: Bool
   public let interactiveDismissEnabled: Bool
   public let shouldAutoUpgradeAnonymousUsers: Bool
+  public let legacyFetchSignInWithEmail: Bool
   public let customStringsBundle: Bundle?
   public let tosUrl: URL?
   public let privacyPolicyUrl: URL?
@@ -39,6 +40,7 @@ public struct AuthConfiguration {
               shouldHideCancelButton: Bool = false,
               interactiveDismissEnabled: Bool = true,
               shouldAutoUpgradeAnonymousUsers: Bool = false,
+              legacyFetchSignInWithEmail: Bool = false,
               customStringsBundle: Bundle? = nil,
               tosUrl: URL? = nil,
               privacyPolicyUrl: URL? = nil,
@@ -51,6 +53,7 @@ public struct AuthConfiguration {
     self.shouldHideCancelButton = shouldHideCancelButton
     self.interactiveDismissEnabled = interactiveDismissEnabled
     self.shouldAutoUpgradeAnonymousUsers = shouldAutoUpgradeAnonymousUsers
+    self.legacyFetchSignInWithEmail = legacyFetchSignInWithEmail
     self.customStringsBundle = customStringsBundle
     self.languageCode = languageCode
     self.tosUrl = tosUrl