fix(build): tighten TypeScript compatibility and update project build configuration

test/test.tagging.ts

@@ -81,6 +81,9 @@ tap.test('should be able to tag a connection from client', async (tools) => {
       return true;
     })
     .getTagById('awesome');
+  if (!tagOnServerSide) {
+    throw new Error('Expected server-side tag awesome to exist');
+  }
   expect(tagOnServerSide.payload).toEqual('yes');
 });
 
@@ -93,7 +96,13 @@ tap.test('should be able to tag a connection from server', async (tools) => {
       id: 'awesome2',
       payload: 'absolutely',
     });
+  if (!testSmartsocketClient.socketConnection) {
+    throw new Error('Expected client socket connection to exist');
+  }
   const tagOnClientSide = await testSmartsocketClient.socketConnection.getTagById('awesome2');
+  if (!tagOnClientSide) {
+    throw new Error('Expected client-side tag awesome2 to exist');
+  }
   expect(tagOnClientSide.payload).toEqual('absolutely');
 });
 
@@ -135,6 +144,9 @@ tap.test('should be able to locate a connection tag after reconnect', async (too
       return true;
     })
     .getTagById('awesome');
+  if (!tagOnServerSide) {
+    throw new Error('Expected server-side tag awesome to exist after reconnect');
+  }
   expect(tagOnServerSide.payload).toEqual('yes');
 });