chore: add missing return types (#447)

client.ts

@@ -52,7 +52,7 @@ export abstract class QueryClient {
     this.#connection = connection;
   }
 
-  get connected() {
+  get connected(): boolean {
     return this.#connection.connected;
   }
 

connection/connection.ts

@@ -128,17 +128,17 @@ export class Connection {
   #tls?: boolean;
   #transport?: "tcp" | "socket";
 
-  get pid() {
+  get pid(): number | undefined {
     return this.#pid;
   }
 
   /** Indicates if the connection is carried over TLS */
-  get tls() {
+  get tls(): boolean | undefined {
     return this.#tls;
   }
 
   /** Indicates the connection protocol used */
-  get transport() {
+  get transport(): "tcp" | "socket" | undefined {
     return this.#transport;
   }
 

query/query.ts

@@ -151,7 +151,7 @@ export class QueryResult {
   #row_description?: RowDescription;
   public warnings: Notice[] = [];
 
-  get rowDescription() {
+  get rowDescription(): RowDescription | undefined {
     return this.#row_description;
   }
 

query/transaction.ts

@@ -30,7 +30,7 @@ export class Savepoint {
     this.#update_callback = update_callback;
   }
 
-  get instances() {
+  get instances(): number {
     return this.#instance_count;
   }
 
@@ -142,11 +142,11 @@ export class Transaction {
     this.#updateClientLock = update_client_lock_callback;
   }
 
-  get isolation_level() {
+  get isolation_level(): IsolationLevel {
     return this.#isolation_level;
   }
 
-  get savepoints() {
+  get savepoints(): Savepoint[] {
     return this.#savepoints;
   }