Release v2.6.0

CHANGES.txt

@@ -1,3 +1,10 @@
+2.6.0 (November 4, 2025)
+ - Added `useTreatment`, `useTreatments`, `useTreatmentWithConfig` and `useTreatmentsWithConfig` hooks to replace the now deprecated `useSplitTreatments` hook.
+ - Updated @splitsoftware/splitio package to version 11.8.0 that includes minor updates:
+      - Added new configuration for Fallback Treatments, which allows setting a treatment value and optional config to be returned in place of "control", either globally or by flag. Read more in our docs.
+      - Added support for custom loggers: added `logger` configuration option and `factory.Logger.setLogger` method to allow the SDK to use a custom logger.
+      - Updated the SDK_READY_FROM_CACHE event to be emitted alongside the SDK_READY event if it hasn’t already been emitted.
+
 2.5.0 (September 18, 2025)
  - Updated @splitsoftware/splitio package to version 11.6.0 that includes minor updates:
       - Added `storage.wrapper` configuration option to allow the SDK to use a custom storage wrapper for the storage type `LOCALSTORAGE`. Default value is `window.localStorage`.

MIGRATION-GUIDE.md

@@ -3,9 +3,32 @@
 
 React SDK v2.0.0 has a few breaking changes that you should consider when migrating from a previous version. The main changes are:
 
-### • Deprecated `useClient`, `useTreatments`, and `useManager` hooks have been removed.
 
-Follow [this section](#migrating-to-get-react-sdk-v1100-improvements-replacing-the-deprecated-useclient-usetreatments-and-usemanager-hooks) to migrate to the new hooks `useSplitClient`, `useSplitTreatments`, and `useSplitManager`.
+### • `useTreatments` hook was removed in v2.0.0, but re-introduced in v2.6.0 with a different API:
+
+Since v2.6.0, there are 4 hooks variants to evaluate feature flags, to better cover the different evaluation methods available in the JavaScript SDK client:
+
+- `useTreatment`: returns a treatment value for a given feature flag name. It calls `client.getTreatment()` method under the hood.
+- `useTreatmentWithConfig`: returns a treatment value and its configuration for a given feature flag name. It calls `client.getTreatmentWithConfig()` method under the hood.
+- `useTreatments`: returns an object with treatment values for multiple feature flag names. It calls `client.getTreatments()` or `client.getTreatmentsByFlagSets()` methods under the hood, depending if the `names` or `flagSets` option is provided.
+- `useTreatmentsWithConfig`: returns an object with treatment values and their configurations for multiple feature flag names. It calls `client.getTreatmentsWithConfig()` or `client.getTreatmentsWithConfigByFlagSets()` methods under the hood, depending if the `names` or `flagSets` option is provided.
+
+The `useTreatments` hook from v1.x.x should be replaced with `useTreatmentsWithConfig`, as follows:
+
+```javascript
+// v1.x.x
+const treatments = useTreatments(featureFlagNames, optionalAttributes, optionalSplitKey);
+
+// v2.6.0+
+const { treatments } = useTreatmentsWithConfig({ names: featureFlagNames, attributes: optionalAttributes, splitKey: optionalSplitKey });
+
+// v2.0.0-v2.5.0
+const { treatments } = useSplitTreatments({ names: featureFlagNames, attributes: optionalAttributes, splitKey: optionalSplitKey });
+```
+
+### • Deprecated `useClient` and `useManager` hooks have been removed.
+
+Follow [this section](#migrating-to-get-react-sdk-v1100-improvements-replacing-the-deprecated-useclient-usetreatments-and-usemanager-hooks) to migrate to the new hooks `useSplitClient` and `useSplitManager`.
 
 ### • Updated the default value of `updateOnSdkUpdate` and `updateOnSdkTimedout` options to `true`.
 
@@ -15,7 +38,7 @@ Consider setting the `updateOnSdkUpdate` option to `false` to revert to the prev
 
 The same applies for the equivalent props in the `[with]SplitClient` and `[with]SplitTreatments` components, although these components are deprecated and we recommend [migrating to their hook alternatives](#-high-order-components-withsplitclient-withsplittreatments-and-components-that-accept-a-render-function-as-child-component-splittreatments-and-splitclient-have-been-deprecated-and-might-be-removed-in-a-future-major-release).
 
-### • Deprecated `SplitFactory` provider has been removed, `withSplitFactory` is deprecated, and `SplitFactoryProvider` doesn't accept `updateOn` props and a render function as children anymore.
+### • Deprecated `SplitFactory` provider has been removed, `withSplitFactory` is deprecated, and `SplitFactoryProvider` doesn't accept a render function as children anymore.
 
 To migrate your existing code to the new version of `SplitFactoryProvider`, consider the following refactor example:
 
@@ -53,21 +76,21 @@ should be refactored to:
 
 ```tsx
 const MyComponent = () => {
-  const props: ISplitContextValues = useSplitClient({ updateOnSdkUpdate: false });
+  const props: ISplitContextValues = useSplitClient();
   const { factory, client, isReady, isReadyFromCache, ... } = props;
   ...
 };
 
 const App = () => {
   return (
-    <SplitFactoryProvider config={mySplitConfig} attributes={DEFAULT_CLIENT_ATTRIBUTES} >
+    <SplitFactoryProvider config={mySplitConfig} updateOnSdkUpdate={false} attributes={DEFAULT_CLIENT_ATTRIBUTES} >
       <MyComponent />
     </SplitFactoryProvider>
   );
 };
 ```
 
-Notice that `MyComponent` was refactored to use the `useSplitClient` hook and is passed as a React JSX element rather than a render function. The `useSplitClient` hook is called without providing a `splitKey` param. This means that the default client (whose key is set in the `core.key` property of the `mySplitConfig` object) will be used, and the `updateOnSdkUpdate` and `attributes` props are passed as options to the hook.
+Notice that `MyComponent` was refactored to use the `useSplitClient` hook and is passed as a React JSX element rather than a render function. The `useSplitClient` hook is called without providing a `splitKey` param. This means that the default client (whose key is set in the `core.key` property of the `mySplitConfig` object) will be used.
 
 ### • High-Order-Components (`withSplitClient`, `withSplitTreatments`) and components that accept a render function as child component (`SplitTreatments`, and `SplitClient`) have been deprecated and might be removed in a future major release.
 

README.md

@@ -18,7 +18,7 @@ Below is a simple example that describes the instantiation and most basic usage
 import React from 'react';
 
 // Import SDK functions
-import { SplitFactoryProvider, useSplitTreatments } from '@splitsoftware/splitio-react';
+import { SplitFactoryProvider, useTreatment } from '@splitsoftware/splitio-react';
 
 // Define your config object
 const CONFIG = {
@@ -29,18 +29,18 @@ const CONFIG = {
 };
 
 function MyComponent() {
-  // Evaluate feature flags with useSplitTreatments hook
-  const { treatments: { FEATURE_FLAG_NAME }, isReady } = useSplitTreatments({ names: ['FEATURE_FLAG_NAME'] });
+  // Evaluate a feature flag with useTreatment hook
+  const { treatment, isReady } = useTreatment({ name: 'FEATURE_FLAG_NAME' });
 
   // Check SDK readiness using isReady prop
   if (!isReady) return <div>Loading SDK ...</div>;
 
-  if (FEATURE_FLAG_NAME.treatment === 'on') {
-    // return JSX for on treatment
-  } else if (FEATURE_FLAG_NAME.treatment === 'off') {
-    // return JSX for off treatment
+  if (treatment === 'on') {
+    // return JSX for 'on' treatment
+  } else if (treatment === 'off') {
+    // return JSX for 'off' treatment
   } else {
-    // return JSX for control treatment
+    // return JSX for 'control' treatment
   };
 }
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@splitsoftware/splitio-react",
-  "version": "2.5.0",
+  "version": "2.6.0",
   "description": "A React library to easily integrate and use Split JS SDK",
   "main": "cjs/index.js",
   "module": "esm/index.js",
@@ -63,7 +63,7 @@
   },
   "homepage": "https://github.com/splitio/react-client#readme",
   "dependencies": {
-    "@splitsoftware/splitio": "11.6.0",
+    "@splitsoftware/splitio": "11.8.0",
     "memoize-one": "^5.1.1",
     "shallowequal": "^1.1.0",
     "tslib": "^2.3.1"

src/SplitClient.tsx

@@ -9,8 +9,6 @@ import { useSplitClient } from './useSplitClient';
  *
  * The underlying SDK client can be changed during the component lifecycle
  * if the component is updated with a different splitKey prop.
- *
- * @deprecated `SplitClient` will be removed in a future major release. We recommend replacing it with the `useSplitClient` hook.
  */
 export function SplitClient(props: ISplitClientProps) {
   const { children } = props;

src/SplitFactoryProvider.tsx

@@ -51,7 +51,7 @@ export function SplitFactoryProvider(props: ISplitFactoryProviderProps) {
   // Effect to initialize and destroy the factory when config is provided
   React.useEffect(() => {
     if (propFactory) {
-      if (config) console.log(WARN_SF_CONFIG_AND_FACTORY);
+      if (config) (propFactory.settings as any).log.warn(WARN_SF_CONFIG_AND_FACTORY);
       return;
     }
 

src/SplitTreatments.tsx

@@ -9,7 +9,7 @@ import { useSplitTreatments } from './useSplitTreatments';
  * call the 'client.getTreatmentsWithConfig()' method if the `names` prop is provided, or the 'client.getTreatmentsWithConfigByFlagSets()' method
  * if the `flagSets` prop is provided. It then passes the resulting treatments to a child component as a function.
  *
- * @deprecated `SplitTreatments` will be removed in a future major release. We recommend replacing it with the `useSplitTreatments` hook.
+ * @deprecated `SplitTreatments` will be removed in a future major release. We recommend replacing it with the `useTreatment*` hooks.
  */
 export function SplitTreatments(props: ISplitTreatmentsProps) {
   const { children } = props;

src/__tests__/SplitClient.test.tsx

@@ -56,6 +56,7 @@ describe('SplitClient', () => {
               client: outerFactory.client(),
               isReady: true,
               isReadyFromCache: true,
+              isOperational: true,
               lastUpdate: getStatus(outerFactory.client()).lastUpdate
             });
 
@@ -141,7 +142,7 @@ describe('SplitClient', () => {
                 expect(statusProps).toStrictEqual([false, false, true, true]);
                 break;
               case 2: // Updated. Although `updateOnSdkReady` is false, status props must reflect the current status of the client.
-                expect(statusProps).toStrictEqual([true, false, true, false]);
+                expect(statusProps).toStrictEqual([true, true, true, false]);
                 break;
               default:
                 fail('Child must not be rerendered');
@@ -182,7 +183,7 @@ describe('SplitClient', () => {
                 expect(statusProps).toStrictEqual([false, false, false, false]);
                 break;
               case 1: // Ready
-                expect(statusProps).toStrictEqual([true, false, true, false]); // not rerendering on SDK_TIMEOUT, but hasTimedout reflects the current state
+                expect(statusProps).toStrictEqual([true, true, true, false]); // not rerendering on SDK_TIMEOUT, but hasTimedout reflects the current state
                 break;
               default:
                 fail('Child must not be rerendered');
@@ -214,7 +215,7 @@ describe('SplitClient', () => {
             count++;
 
             // side effect in the render phase
-            if (!(client as any).__getStatus().isReady) {
+            if (!client!.getStatus().isReady) {
               (client as any).__emitter__.emit(Event.SDK_READY);
             }
 
@@ -318,11 +319,11 @@ describe('SplitClient', () => {
                   break;
                 case 4:
                   expect(client).toBe(outerFactory.client('user3'));
-                  expect(statusProps).toStrictEqual([true, false, false, false]);
+                  expect(statusProps).toStrictEqual([true, true, false, false]);
                   break;
                 case 5:
                   expect(client).toBe(outerFactory.client('user3'));
-                  expect(statusProps).toStrictEqual([true, false, false, false]);
+                  expect(statusProps).toStrictEqual([true, true, false, false]);
                   break;
                 default:
                   fail('Child must not be rerendered');
@@ -501,7 +502,7 @@ describe('SplitFactoryProvider + SplitClient', () => {
                 expect(statusProps).toStrictEqual([false, false, true, true]);
                 break;
               case 2: // Updated. Although `updateOnSdkReady` is false, status props must reflect the current status of the client.
-                expect(statusProps).toStrictEqual([true, false, true, false]);
+                expect(statusProps).toStrictEqual([true, true, true, false]);
                 break;
               default:
                 fail('Child must not be rerendered');
@@ -542,7 +543,7 @@ describe('SplitFactoryProvider + SplitClient', () => {
                 expect(statusProps).toStrictEqual([false, false, true, true]);
                 break;
               case 2: // Updated. Although `updateOnSdkReady` is false, status props must reflect the current status of the client.
-                expect(statusProps).toStrictEqual([true, false, true, false]);
+                expect(statusProps).toStrictEqual([true, true, true, false]);
                 break;
               default:
                 fail('Child must not be rerendered');
@@ -578,7 +579,7 @@ describe('SplitFactoryProvider + SplitClient', () => {
                 expect(statusProps).toStrictEqual([false, false, false, false]);
                 break;
               case 1: // Ready
-                expect(statusProps).toStrictEqual([true, false, true, false]); // not rerendering on SDK_TIMEOUT, but hasTimedout reflects the current state
+                expect(statusProps).toStrictEqual([true, true, true, false]); // not rerendering on SDK_TIMEOUT, but hasTimedout reflects the current state
                 break;
               default:
                 fail('Child must not be rerendered');
@@ -615,7 +616,7 @@ describe('SplitFactoryProvider + SplitClient', () => {
                 expect(statusProps).toStrictEqual([false, false, false, false]);
                 break;
               case 1: // Ready
-                expect(statusProps).toStrictEqual([true, false, true, false]); // not rerendering on SDK_TIMEOUT, but hasTimedout reflects the current state
+                expect(statusProps).toStrictEqual([true, true, true, false]); // not rerendering on SDK_TIMEOUT, but hasTimedout reflects the current state
                 break;
               default:
                 fail('Child must not be rerendered');

src/__tests__/SplitFactoryProvider.test.tsx

@@ -70,6 +70,7 @@ describe('SplitFactoryProvider', () => {
             client: outerFactory.client(),
             isReady: true,
             isReadyFromCache: true,
+            isOperational: true,
             lastUpdate: getStatus(outerFactory.client()).lastUpdate
           });
           return null;
@@ -113,7 +114,7 @@ describe('SplitFactoryProvider', () => {
       </SplitFactoryProvider>
     );
 
-    expect(logSpy).toBeCalledWith(WARN_SF_CONFIG_AND_FACTORY);
+    expect(logSpy).toBeCalledWith('[WARN]  splitio => ' + WARN_SF_CONFIG_AND_FACTORY);
     logSpy.mockRestore();
   });