refactor: simplified isString

Author: jbpionnier

packages/common/test/utils/shared.utils.spec.ts

@@ -44,6 +44,8 @@ describe('Shared utils', () => {
     });
     it('should returns false when object is not string', () => {
       expect(isString(false)).to.be.false;
+      expect(isString(null)).to.be.false;
+      expect(isString(undefined)).to.be.false;
     });
   });
   describe('isConstructor', () => {

packages/microservices/client/client-proxy.ts

@@ -87,6 +87,6 @@ export abstract class ClientProxy {
   }
 
   protected normalizePattern<T = any>(pattern: T): string {
-    return pattern && isString(pattern) ? pattern : JSON.stringify(pattern);
+    return isString(pattern) ? pattern : JSON.stringify(pattern);
   }
 }