diff --git a/libs/browser/src/lib/services/browser-micro-sentry-client.ts b/libs/browser/src/lib/services/browser-micro-sentry-client.ts
index abd08e9..ebb34f1 100644
--- a/libs/browser/src/lib/services/browser-micro-sentry-client.ts
+++ b/libs/browser/src/lib/services/browser-micro-sentry-client.ts
@@ -11,6 +11,7 @@ import { State } from '../models/state';
 import { MicroSentryPlugin } from '../models/plugin';
 import { BrowserSentryClientOptions } from '../models/browser-sentry-client-options';
 import { isMatchingPattern } from '../utils/is-matching-pattern';
+import { __assign } from 'tslib';
 
 export class BrowserMicroSentryClient extends MicroSentryClient {
   private destroyed = false;
@@ -233,8 +234,7 @@ export class BrowserMicroSentryClient extends MicroSentryClient {
           ? newStateValue
           : null;
 
-        return {
-          ...acc,
+        return __assign(acc, {
           [key]:
             stateArray || newStateArray
               ? [...(stateArray || []), ...(newStateArray || [])]
@@ -242,7 +242,7 @@ export class BrowserMicroSentryClient extends MicroSentryClient {
                   ...(typeof stateValue !== 'string' ? stateValue : {}),
                   ...(typeof newStateValue !== 'string' ? newStateValue : {}),
                 },
-        };
+        });
       },
       {}
     );
diff --git a/libs/core/src/lib/service/micro-sentry-client.ts b/libs/core/src/lib/service/micro-sentry-client.ts
index e29b865..a793d09 100644
--- a/libs/core/src/lib/service/micro-sentry-client.ts
+++ b/libs/core/src/lib/service/micro-sentry-client.ts
@@ -2,25 +2,7 @@ import { SentryRequest } from '../models/models';
 import { AUTH_HEADER, DSN_REGEXP } from '../consts/consts';
 import { computeStackTrace } from '../helpers/compute-stack-trace';
 import { SentryClientOptions } from '../models/sentry-client-options';
-
-const __assign =
-  Object.assign ||
-  function __assign(target: Record<string, any>) {
-    const length = arguments.length;
-
-    for (let i = 1; i < length; i++) {
-      // eslint-disable-next-line prefer-rest-params
-      const source = arguments[i];
-
-      for (const property in source) {
-        if (Object.prototype.hasOwnProperty.call(source, property)) {
-          target[property] = source[property];
-        }
-      }
-    }
-
-    return target;
-  };
+import { __assign } from 'tslib';
 
 export class MicroSentryClient {
   readonly authHeader?: string;