Added logic to stringify release if it is of type object

Author: ahmedetefy

packages/hub/src/session.ts

@@ -115,7 +115,7 @@ export class Session implements SessionInterface {
       did: typeof this.did === 'number' || typeof this.did === 'string' ? `${this.did}` : undefined,
       duration: this.duration,
       attrs: dropUndefinedKeys({
-        release: this.release,
+        release: typeof this.release !== 'string' ? JSON.stringify(this.release) : this.release,
         environment: this.environment,
         ip_address: this.ipAddress,
         user_agent: this.userAgent,

packages/hub/test/session.test.ts

@@ -0,0 +1,13 @@
+import { Session } from '../src';
+
+describe('Session', () => {
+  test('Release of type object is stringified in toJSON()', () => {
+    const session = new Session({
+      // @ts-ignore
+      release: { name: 'whatever' },
+    });
+    expect(session.toJSON()).toEqual(
+      expect.objectContaining({ attrs: { release: JSON.stringify({ name: 'whatever' }) } }),
+    );
+  });
+});