chore: add remote feature flag for multichain accounts

ui/selectors/index.js

@@ -10,3 +10,4 @@ export * from './accounts';
 export * from './remote-feature-flags';
 export * from './origin-throttling';
 export * from './multichain/networks';
+export * from './multichain-accounts';

ui/selectors/multichain-accounts/feature-flags.test.ts

@@ -0,0 +1,48 @@
+import { type RemoteFeatureFlagsState } from '../remote-feature-flags';
+import {
+  type MultichainAccountsFeatureFlag,
+  getIsMultichainAccountsState1Enabled,
+  getIsMultichainAccountsState2Enabled,
+} from './feature-flags';
+
+jest.mock('../../../package.json', () => ({
+  packageJson: {
+    version: '12.0.0',
+  },
+}));
+
+type TestState = RemoteFeatureFlagsState & {
+  metamask: {
+    remoteFeatureFlags: {
+      enableMultichainAccounts: MultichainAccountsFeatureFlag;
+    };
+  };
+};
+
+const disabledStateMock: MultichainAccountsFeatureFlag = {
+  enabled: false,
+  featureVersion: null,
+  minimumVersion: null,
+};
+
+const mockState: TestState = {
+  metamask: {
+    remoteFeatureFlags: {
+      enableMultichainAccounts: disabledStateMock,
+    },
+  },
+};
+
+describe('Multichain Accounts Feature Flags', () => {
+  describe('getIsMultichainAccountsState1Enabled', () => {
+    it('returns false for disabled state', () => {
+      expect(getIsMultichainAccountsState1Enabled(mockState)).toBe(false);
+    });
+  });
+
+  describe('getIsMultichainAccountsState2Enabled', () => {
+    it('returns false for disabled state', () => {
+      expect(getIsMultichainAccountsState2Enabled(mockState)).toBe(false);
+    });
+  });
+});

ui/selectors/multichain-accounts/feature-flags.ts

@@ -0,0 +1,96 @@
+/* eslint-disable @typescript-eslint/no-unused-vars */
+// We can ignore the unused vars warning while the flag is not active
+
+import {
+  Infer,
+  object,
+  boolean,
+  nullable,
+  string,
+  assert,
+} from '@metamask/superstruct';
+import semver from 'semver';
+import packageJson from '../../../package.json';
+import {
+  getRemoteFeatureFlags,
+  type RemoteFeatureFlagsState,
+} from '../remote-feature-flags';
+import { createDeepEqualSelector } from '../../../shared/modules/selectors/util';
+
+/**
+ * Feature flag structure for multichain accounts features
+ */
+const MultichainAccountsFeatureFlag = object({
+  enabled: boolean(),
+  featureVersion: nullable(string()),
+  minimumVersion: nullable(string()),
+});
+
+/**
+ * Feature flag type for multichain accounts features
+ */
+export type MultichainAccountsFeatureFlag = Infer<
+  typeof MultichainAccountsFeatureFlag
+>;
+
+// TODO: Update the value to the decided version multichain accounts will be released
+const APP_VERSION = packageJson.version;
+const FEATURE_VERSION_1 = '1';
+const FEATURE_VERSION_2 = '2';
+
+/**
+ * Checks if the multichain accounts feature is enabled for a given state and feature version.
+ *
+ * @param state - The MetaMask state object
+ * @param featureVersion - The specific feature version to check
+ * @returns boolean - True if the feature is enabled for the given state and version, false otherwise.
+ */
+export const isMultichainAccountsFeatureEnabled = (
+  state: RemoteFeatureFlagsState,
+  featureVersion: string,
+) => {
+  const { enableMultichainAccounts } = getRemoteFeatureFlags(state);
+  try {
+    assert(enableMultichainAccounts, MultichainAccountsFeatureFlag);
+  } catch (error) {
+    console.error(error);
+    return false;
+  }
+
+  const {
+    enabled,
+    featureVersion: currentFeatureVersion,
+    minimumVersion,
+  } = enableMultichainAccounts;
+  return (
+    enabled &&
+    currentFeatureVersion &&
+    minimumVersion &&
+    currentFeatureVersion === featureVersion &&
+    semver.gt(minimumVersion, APP_VERSION)
+  );
+};
+
+/**
+ * Selector to check if the multichain accounts feature is enabled for state 1.
+ */
+export const getIsMultichainAccountsState1Enabled = createDeepEqualSelector(
+  (state: RemoteFeatureFlagsState) => state,
+  (state) => {
+    return false;
+    // TODO: Uncomment this when the feature is ready for release
+    // return isMultichainAccountsFeatureEnabled(state, FEATURE_VERSION_1);
+  },
+);
+
+/**
+ * Selector to check if the multichain accounts feature is enabled for state 2.
+ */
+export const getIsMultichainAccountsState2Enabled = createDeepEqualSelector(
+  (state: RemoteFeatureFlagsState) => state,
+  (state) => {
+    return false;
+    // TODO: Uncomment this when the feature is ready for release
+    // return isMultichainAccountsFeatureEnabled(state, FEATURE_VERSION_2);
+  },
+);

ui/selectors/multichain-accounts/index.ts

@@ -0,0 +1 @@
+export * from './feature-flags';