fix merge conflicts

Author: harshithad0703

.talismanrc

@@ -1,4 +1,6 @@
 fileignoreconfig:
+  - filename: lib/contentstackClient.js
+    checksum: f564f6eee5c17dc73abdeab4be226a3b37942893e149d907d2a4ef415c485c5e
   - filename: test/unit/globalField-test.js
     checksum: 25185e3400a12e10a043dc47502d8f30b7e1c4f2b6b4d3b8b55cdc19850c48bf
   - filename: lib/stack/index.js
@@ -9,7 +11,9 @@ fileignoreconfig:
     ignore_detectors:
       - filecontent
   - filename: package-lock.json
-    checksum: 47d7cb6b4cd8701aa289aa2e3975162b1291d4c8a60725d21c103a1ba59df201
+    checksum: 4a58eb4ee1f54d68387bd005fb76e83a02461441c647d94017743d3442c0f476
+  - filename: test/unit/ContentstackClient-test.js
+    checksum: 5d8519b5b93c715e911a62b4033614cc4fb3596eabf31c7216ecb4cc08604a73
   - filename: .husky/pre-commit
     checksum: 52a664f536cf5d1be0bea19cb6031ca6e8107b45b6314fe7d47b7fad7d800632
   - filename: test/sanity-check/api/user-test.js
@@ -26,10 +30,6 @@ fileignoreconfig:
     checksum: e8a32ffbbbdba2a15f3d327273f0a5b4eb33cf84cd346562596ab697125bbbc6
   - filename: test/sanity-check/api/bulkOperation-test.js
     checksum: f40a14c84ab9a194aaf830ca68e14afde2ef83496a07d4a6393d7e0bed15fb0e
-  - filename: lib/contentstackClient.js
-    checksum: b76ca091caa3a1b2658cd422a2d8ef3ac9996aea0aff3f982d56bb309a3d9fde
-  - filename: test/unit/ContentstackClient-test.js
-    checksum: 974a4f335aef025b657d139bb290233a69bed1976b947c3c674e97baffe4ce2f
   - filename: test/unit/ContentstackHTTPClient-test.js
     checksum: 4043efd843e24da9afd0272c55ef4b0432e3374b2ca12b913f1a6654df3f62be
   - filename: test/unit/contentstack-test.js

CHANGELOG.md

@@ -1,10 +1,16 @@
 # Changelog
 
-## [v1.27.5](https://github.com/contentstack/contentstack-management-javascript/tree/v1.27.5) (2026-02-16)
+## [v1.27.6](https://github.com/contentstack/contentstack-management-javascript/tree/v1.27.5) (2026-02-23)
  - Fix
    - Skip token refresh on 401 when API returns error_code 161 (environment/permission) so the actual API error is returned instead of triggering refresh and a generic "Unable to refresh token" message
    - When token refresh fails after a 401, return the original API error (error_message, error_code) instead of the generic "Unable to refresh token" message
 
+## [v1.27.5](https://github.com/contentstack/contentstack-management-javascript/tree/v1.27.5) (2026-02-11)
+ - Fix
+   - Concurrency queue: when response errors have no `config` (e.g. after network retries exhaust in some environments, or when plugins return a new error object), the SDK now rejects with a catchable Error instead of throwing an unhandled TypeError and crashing the process
+   - Hardened `responseHandler` to safely handle errors without `config` (e.g. plugin-replaced errors) by guarding `config.onComplete` and still running queue `shift()` so rejections remain catchable
+   - Added optional chaining for `error.config` reads in the retry path and unit tests for missing-config scenarios
+
 ## [v1.27.4](https://github.com/contentstack/contentstack-management-javascript/tree/v1.27.4) (2026-02-02)
  - Fix
    - Removed content-type header from the release delete method

lib/core/concurrency-queue.js

@@ -172,7 +172,7 @@ export function ConcurrencyQueue ({ axios, config, plugins = [] }) {
       logFinalFailure(errorInfo, this.config.maxNetworkRetries)
       // Final error message
       const finalError = new Error(`Network request failed after ${this.config.maxNetworkRetries} retries: ${errorInfo.reason}`)
-      finalError.code = error.code
+      finalError.code = error && error.code
       finalError.originalError = error
       finalError.retryAttempts = attempt - 1
       return Promise.reject(finalError)
@@ -181,6 +181,16 @@ export function ConcurrencyQueue ({ axios, config, plugins = [] }) {
     const delay = calculateNetworkRetryDelay(attempt)
     logRetryAttempt(errorInfo, attempt, delay)
 
+    // Guard: retry failures (e.g. from nested retries) may not have config in some
+    // environments. Reject with a catchable error instead of throwing TypeError.
+    if (!error || !error.config) {
+      const finalError = new Error(`Network request failed after retries: ${errorInfo.reason}`)
+      finalError.code = error && error.code
+      finalError.originalError = error
+      finalError.retryAttempts = attempt - 1
+      return Promise.reject(finalError)
+    }
+
     // Initialize retry count if not present
     if (!error.config.networkRetryCount) {
       error.config.networkRetryCount = 0
@@ -200,9 +210,7 @@ export function ConcurrencyQueue ({ axios, config, plugins = [] }) {
         safeAxiosRequest(requestConfig)
           .then((response) => {
             // On successful retry, call the original onComplete to properly clean up
-            if (error.config.onComplete) {
-              error.config.onComplete()
-            }
+            error?.config?.onComplete?.()
             shift() // Process next queued request
             resolve(response)
           })
@@ -214,17 +222,13 @@ export function ConcurrencyQueue ({ axios, config, plugins = [] }) {
                 .then(resolve)
                 .catch((finalError) => {
                   // On final failure, clean up the running queue
-                  if (error.config.onComplete) {
-                    error.config.onComplete()
-                  }
+                  error?.config?.onComplete?.()
                   shift() // Process next queued request
                   reject(finalError)
                 })
             } else {
               // On non-retryable error, clean up the running queue
-              if (error.config.onComplete) {
-                error.config.onComplete()
-              }
+              error?.config?.onComplete?.()
               shift() // Process next queued request
               reject(retryError)
             }
@@ -446,9 +450,12 @@ export function ConcurrencyQueue ({ axios, config, plugins = [] }) {
       }
     })
   }
-  // Response interceptor used for
+  // Response interceptor used for success and for error path (Promise.reject(responseHandler(err))).
+  // When used with an error, err may lack config (e.g. plugin returns new error). Guard so we don't throw.
   const responseHandler = (response) => {
-    response.config.onComplete()
+    if (response?.config?.onComplete) {
+      response.config.onComplete()
+    }
     shift()
     return response
   }
@@ -478,13 +485,27 @@ export function ConcurrencyQueue ({ axios, config, plugins = [] }) {
   }
 
   const responseErrorHandler = error => {
-    let networkError = error.config.retryCount
+    // Guard: Axios errors normally have config; missing config can occur when a retry
+    // fails in certain environments or when non-Axios errors propagate (e.g. timeouts).
+    // Reject with a catchable error instead of throwing TypeError and crashing the process.
+    if (!error || !error.config) {
+      const fallbackError = new Error(
+        error && typeof error.message === 'string'
+          ? error.message
+          : 'Network request failed: error object missing request config'
+      )
+      fallbackError.code = error?.code
+      fallbackError.originalError = error
+      return Promise.reject(runPluginOnResponseForError(fallbackError))
+    }
+
+    let networkError = error?.config?.retryCount ?? 0
     let retryErrorType = null
 
     // First, check for transient network errors
     const networkErrorInfo = isTransientNetworkError(error)
     if (networkErrorInfo && this.config.retryOnNetworkFailure) {
-      const networkRetryCount = error.config.networkRetryCount || 0
+      const networkRetryCount = error?.config?.networkRetryCount || 0
       return retryNetworkError(error, networkErrorInfo, networkRetryCount + 1)
     }
 
@@ -499,7 +520,7 @@ export function ConcurrencyQueue ({ axios, config, plugins = [] }) {
     var response = error.response
     if (!response) {
       if (error.code === 'ECONNABORTED') {
-        const timeoutMs = error.config.timeout || this.config.timeout || 'unknown'
+        const timeoutMs = error?.config?.timeout || this.config.timeout || 'unknown'
         error.response = {
           ...error.response,
           status: 408,