Added branch support in entry variants

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## [v1.31.0](https://github.com/contentstack/contentstack-management-javascript/tree/v1.31.0) (2026-05-12)
+
+- Enh
+  - Entry variants: `contentType(...).entry(...).variants(variantUidOrUids, branchName?)` — optional second argument sets the CMA `branch` header for that variants scope (branch UID or alias). First argument accepts a variant UID string or an array of UIDs (comma-separated in the request path). Omitting `branchName` preserves previous behavior.
+- Test
+  - Unit tests and sanity API tests for entry variants with an explicit branch.
+
 ## [v1.30.2](https://github.com/contentstack/contentstack-management-javascript/tree/v1.30.2) (2026-04-22)
 
 - Update dependencies

lib/stack/contentType/entry/index.js

@@ -285,22 +285,60 @@ export function Entry (http, data) {
      * @description The variants call returns a Variants instance for managing variants of an entry.
      * @memberof Entry
      * @func variants
-     * @param {String=} uid - Variant UID. If not provided, returns Variants instance for querying all variants.
+     * @param {string|string[]=} variantUidOrUids - Variant UID, list of UIDs (comma-separated in the path), or omit to query all variants.
+     * @param {string=} branchName - Optional branch UID or alias for this variants scope (sent as the branch header). Omit to use the stack default branch.
      * @returns {Variants} Instance of Variants.
      * @example
      * import * as contentstack from '@contentstack/management'
      * const client = contentstack.client()
      * const variants = client.stack({ api_key: 'api_key'}).contentType('content_type_uid').entry('uid').variants('uid')
      * variants.fetch()
      * .then((response) => console.log(response));
+     * @example
+     * client.stack({ api_key: 'api_key'}).contentType('content_type_uid').entry('uid').variants('uid', 'branch_name').update(data)
+     * .then((response) => console.log(response));
      */
-    this.variants = (uid = null) => {
-      const data = { stackHeaders: this.stackHeaders }
-      data.content_type_uid = this.content_type_uid
-      data.entry_uid = this.uid
-      if (uid) {
-        data.variants_uid = uid
+    this.variants = (variantUidOrUids, branchName) => {
+      const uidInput = variantUidOrUids === undefined ? null : variantUidOrUids
+      const branch =
+        typeof branchName === 'string' && branchName !== ''
+          ? branchName
+          : undefined
+
+      const data = {
+        content_type_uid: this.content_type_uid,
+        entry_uid: this.uid
+      }
+
+      if (branch === undefined) {
+        data.stackHeaders = this.stackHeaders
+      } else {
+        data.stackHeaders = {
+          ...cloneDeep(this.stackHeaders || {}),
+          branch
+        }
       }
+
+      let variantsUid = null
+      if (Array.isArray(uidInput)) {
+        const uids = uidInput.filter(
+          (uid) => typeof uid === 'string' && uid.length > 0
+        )
+        if (uids.length === 1) {
+          variantsUid = uids[0]
+        } else if (uids.length > 1) {
+          variantsUid = uids.join(',')
+        }
+      } else if (typeof uidInput === 'string' && uidInput.length > 0) {
+        variantsUid = uidInput
+      } else if (uidInput != null && uidInput !== '') {
+        variantsUid = uidInput
+      }
+
+      if (variantsUid != null && variantsUid !== '') {
+        data.variants_uid = variantsUid
+      }
+
       return new Variants(http, data)
     }
 

lib/stack/contentType/entry/variants/index.js

@@ -14,8 +14,18 @@ import { bindModuleHeaders } from '../../../../core/moduleHeaderSupport.js'
 export function Variants (http, data) {
   Object.assign(this, cloneDeep(data))
   this.urlPath = `/content_types/${this.content_type_uid}/entries/${this.entry_uid}/variants`
-  if (data && data.variants_uid) {
-    this.urlPath += `/${this.variants_uid}`
+  let variantPathSegment = ''
+  if (data?.variants_uid != null && data.variants_uid !== '') {
+    if (Array.isArray(data.variants_uid)) {
+      variantPathSegment = data.variants_uid
+        .filter((uid) => typeof uid === 'string' && uid.length > 0)
+        .join(',')
+    } else {
+      variantPathSegment = String(data.variants_uid)
+    }
+  }
+  if (variantPathSegment) {
+    this.urlPath += `/${variantPathSegment}`
     /**
          * @description The Update a variant call updates an existing variant for the selected content type.
          * @memberof Variants
@@ -38,7 +48,7 @@ export function Variants (http, data) {
          *          }
          *          }
          *      }
-         * client.stack({ api_key: 'api_key'}).contentType('content_type_uid').entry('entry_uid').variants('uid').update(data)
+         * client.stack({ api_key: 'api_key'}).contentType('content_type_uid').entry('entry_uid').variants('uid', 'branch_name').update(data)
          * .then((variants) => console.log(variants))
          */
     this.update = async (data, params = {}) => {