From e39dd19fce7c9219dce1ea85f3086a65f6918ead Mon Sep 17 00:00:00 2001
From: ieow <4881057+ieow@users.noreply.github.com>
Date: Tue, 24 Mar 2026 14:44:57 +0000
Subject: [PATCH] chore(runway): cherry-pick feat: legacy-ios-feature-flag
 cp-7.71.0 (#27848)

<!--
Please submit this PR as a draft initially.
Do not mark it as "Ready for review" until the template has been
completely filled out, and PR status checks have passed at least once.
-->

## **Description**
Support webcredential for ios google login
Part 2/4 - Add feature flag

This pr add feature flag for the ios google login


PR list
Part 1/ 4 - https://github.com/MetaMask/metamask-mobile/pull/27741
Part 2/ 4 - https://github.com/MetaMask/metamask-mobile/pull/27848
Part 3/ 4 - https://github.com/MetaMask/metamask-mobile/pull/27850
Part 4/ 4 - TBA

<!--
Write a short description of the changes included in this pull request,
also include relevant motivation and context. Have in mind the following
questions:
1. What is the reason for the change?
2. What is the improvement/solution?
-->

## **Changelog**

<!--
If this PR is not End-User-Facing and should not show up in the
CHANGELOG, you can choose to either:
1. Write `CHANGELOG entry: null`
2. Label with `no-changelog`

If this PR is End-User-Facing, please write a short User-Facing
description in the past tense like:
`CHANGELOG entry: Added a new tab for users to see their NFTs`
`CHANGELOG entry: Fixed a bug that was causing some NFTs to flicker`

(This helps the Release Engineer do their job more quickly and
accurately)
-->

CHANGELOG entry: added legacyIosGoogleConfigEnabled feature flag

## **Related issues**

Fixes:

## **Manual testing steps**

```gherkin
Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]
```

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<!-- [screenshots/recordings] -->

### **After**

<!-- [screenshots/recordings] -->

## **Pre-merge author checklist**

- [ ] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] I've included tests if applicable
- [ ] I've documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] I've applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.



<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk: adds a new remote feature flag and selector with env
override, without changing authentication flow yet; main risk is
misconfiguration since the selector defaults to enabled.
>
> **Overview**
> Adds a new remote feature flag, `legacyIosGoogleConfigEnabled`,
including registry metadata and a dedicated selector
`selectLegacyIosGoogleConfigEnabled` (defaulting to `true`) that can be
force-overridden via `MM_LEGACY_IOS_GOOGLE_CONFIG_ENABLED`.
>
> Includes unit tests covering default/remote/env override behavior, and
updates `babel.config.tests.js` to avoid inlining env vars for the new
selector and its tests.
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
ca7e8132c44d06ba009029b1f83eb4412e10006f. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
---
 app/constants/featureFlags.ts                 |  1 +
 .../legacyIosGoogleConfig/index.test.ts       | 56 +++++++++++++++++++
 .../legacyIosGoogleConfig/index.ts            | 26 +++++++++
 babel.config.tests.js                         |  2 +
 tests/feature-flags/feature-flag-registry.ts  |  8 +++
 5 files changed, 93 insertions(+)
 create mode 100644 app/selectors/featureFlagController/legacyIosGoogleConfig/index.test.ts
 create mode 100644 app/selectors/featureFlagController/legacyIosGoogleConfig/index.ts

diff --git a/app/constants/featureFlags.ts b/app/constants/featureFlags.ts
index c443b3f9fd6..a439f406657 100644
--- a/app/constants/featureFlags.ts
+++ b/app/constants/featureFlags.ts
@@ -15,6 +15,7 @@ export enum FeatureFlagNames {
   tokenDetailsV2Buttons = 'tokenDetailsV2Buttons',
   tokenDetailsV2ButtonLayout = 'tokenDetailsV2ButtonLayout',
   complianceEnabled = 'complianceEnabled',
+  legacyIosGoogleConfigEnabled = 'legacyIosGoogleConfigEnabled',
 }
 
 export const DEFAULT_FEATURE_FLAG_VALUES: Partial<
diff --git a/app/selectors/featureFlagController/legacyIosGoogleConfig/index.test.ts b/app/selectors/featureFlagController/legacyIosGoogleConfig/index.test.ts
new file mode 100644
index 00000000000..3a507ff875a
--- /dev/null
+++ b/app/selectors/featureFlagController/legacyIosGoogleConfig/index.test.ts
@@ -0,0 +1,56 @@
+import {
+  DEFAULT_LEGACY_IOS_GOOGLE_CONFIG_ENABLED,
+  selectLegacyIosGoogleConfigEnabled,
+} from '.';
+import { FeatureFlagNames } from '../../../constants/featureFlags';
+
+describe('Legacy iOS Google Config Feature Flag Selector', () => {
+  const originalEnv = process.env.MM_LEGACY_IOS_GOOGLE_CONFIG_ENABLED;
+
+  beforeEach(() => {
+    delete process.env.MM_LEGACY_IOS_GOOGLE_CONFIG_ENABLED;
+  });
+
+  afterAll(() => {
+    if (originalEnv === undefined) {
+      delete process.env.MM_LEGACY_IOS_GOOGLE_CONFIG_ENABLED;
+      return;
+    }
+
+    process.env.MM_LEGACY_IOS_GOOGLE_CONFIG_ENABLED = originalEnv;
+  });
+
+  it('returns the default value when the remote flag is missing', () => {
+    const result = selectLegacyIosGoogleConfigEnabled.resultFunc({});
+
+    expect(result).toBe(DEFAULT_LEGACY_IOS_GOOGLE_CONFIG_ENABLED);
+  });
+
+  it('returns the remote flag value when present', () => {
+    const result = selectLegacyIosGoogleConfigEnabled.resultFunc({
+      [FeatureFlagNames.legacyIosGoogleConfigEnabled]: false,
+    });
+
+    expect(result).toBe(false);
+  });
+
+  it('allows the local env var to force enable the legacy config', () => {
+    process.env.MM_LEGACY_IOS_GOOGLE_CONFIG_ENABLED = 'true';
+
+    const result = selectLegacyIosGoogleConfigEnabled.resultFunc({
+      [FeatureFlagNames.legacyIosGoogleConfigEnabled]: false,
+    });
+
+    expect(result).toBe(true);
+  });
+
+  it('allows the local env var to force disable the legacy config', () => {
+    process.env.MM_LEGACY_IOS_GOOGLE_CONFIG_ENABLED = 'false';
+
+    const result = selectLegacyIosGoogleConfigEnabled.resultFunc({
+      [FeatureFlagNames.legacyIosGoogleConfigEnabled]: true,
+    });
+
+    expect(result).toBe(false);
+  });
+});
diff --git a/app/selectors/featureFlagController/legacyIosGoogleConfig/index.ts b/app/selectors/featureFlagController/legacyIosGoogleConfig/index.ts
new file mode 100644
index 00000000000..be844dc3bd6
--- /dev/null
+++ b/app/selectors/featureFlagController/legacyIosGoogleConfig/index.ts
@@ -0,0 +1,26 @@
+import { hasProperty } from '@metamask/utils';
+import { createSelector } from 'reselect';
+import { FeatureFlagNames } from '../../../constants/featureFlags';
+import { getFeatureFlagValue } from '../env';
+import { selectRemoteFeatureFlags } from '..';
+
+export const DEFAULT_LEGACY_IOS_GOOGLE_CONFIG_ENABLED = true;
+
+export const selectLegacyIosGoogleConfigEnabled = createSelector(
+  selectRemoteFeatureFlags,
+  (remoteFeatureFlags) => {
+    const remoteValue = hasProperty(
+      remoteFeatureFlags,
+      FeatureFlagNames.legacyIosGoogleConfigEnabled,
+    )
+      ? Boolean(
+          remoteFeatureFlags[FeatureFlagNames.legacyIosGoogleConfigEnabled],
+        )
+      : DEFAULT_LEGACY_IOS_GOOGLE_CONFIG_ENABLED;
+    return getFeatureFlagValue(
+      // Use direct env access so Babel can inline this value in app builds.
+      process.env.MM_LEGACY_IOS_GOOGLE_CONFIG_ENABLED,
+      remoteValue,
+    );
+  },
+);
diff --git a/babel.config.tests.js b/babel.config.tests.js
index bf4dfe1bd1f..292e3151ff1 100644
--- a/babel.config.tests.js
+++ b/babel.config.tests.js
@@ -37,6 +37,8 @@ const newOverrides = [
       'app/components/UI/Ramp/hooks/useRampTokens.test.ts',
       'app/components/Views/confirmations/hooks/pay/useTransactionPayWithdraw.ts',
       'app/components/Views/confirmations/hooks/pay/useTransactionPayWithdraw.test.ts',
+      'app/selectors/featureFlagController/legacyIosGoogleConfig/index.ts',
+      'app/selectors/featureFlagController/legacyIosGoogleConfig/index.test.ts',
       'app/util/environment.ts',
       'app/util/environment.test.ts',
       'app/core/Engine/controllers/rewards-controller/utils/rewards-api-url.ts',
diff --git a/tests/feature-flags/feature-flag-registry.ts b/tests/feature-flags/feature-flag-registry.ts
index bb05b3aa658..2c696a8020c 100644
--- a/tests/feature-flags/feature-flag-registry.ts
+++ b/tests/feature-flags/feature-flag-registry.ts
@@ -2829,6 +2829,14 @@ export const FEATURE_FLAG_REGISTRY: Record<string, FeatureFlagRegistryEntry> = {
     status: FeatureFlagStatus.Active,
   },
 
+  legacyIosGoogleConfigEnabled: {
+    name: 'legacyIosGoogleConfigEnabled',
+    type: FeatureFlagType.Remote,
+    inProd: true,
+    productionDefault: true,
+    status: FeatureFlagStatus.Active,
+  },
+
   metalCardCheckoutEnabled: {
     name: 'metalCardCheckoutEnabled',
     type: FeatureFlagType.Remote,