LINT: import types

Also prefer `| undefined`, which was reported by another user and might
be related to the TypeScript version bump here.

packages/driver/src/baseConn.ts

@@ -17,10 +17,10 @@
  */
 
 import { INVALID_CODEC, NullCodec, NULL_CODEC } from "./codecs/codecs";
-import { ICodec, uuid } from "./codecs/ifaces";
+import type { ICodec, uuid } from "./codecs/ifaces";
 import { NamedTupleCodec } from "./codecs/namedtuple";
 import { ObjectCodec } from "./codecs/object";
-import { CodecsRegistry } from "./codecs/registry";
+import { type CodecsRegistry } from "./codecs/registry";
 import { EmptyTupleCodec, EMPTY_TUPLE_CODEC, TupleCodec } from "./codecs/tuple";
 import { versionGreaterThanOrEqual } from "./utils";
 import * as errors from "./errors";
@@ -29,10 +29,10 @@ import {
   Cardinality,
   LegacyHeaderCodes,
   OutputFormat,
-  QueryOptions,
-  ProtocolVersion,
-  QueryArgs,
-  ServerSettings,
+  type QueryOptions,
+  type ProtocolVersion,
+  type QueryArgs,
+  type ServerSettings,
 } from "./ifaces";
 import {
   ReadBuffer,
@@ -44,7 +44,7 @@ import {
 import * as chars from "./primitives/chars";
 import Event from "./primitives/event";
 import LRU from "./primitives/lru";
-import { SerializedSessionState, Session } from "./options";
+import { type SerializedSessionState, Session } from "./options";
 
 export const PROTO_VER: ProtocolVersion = [1, 0];
 export const PROTO_VER_MIN: ProtocolVersion = [0, 9];
@@ -478,9 +478,9 @@ export class BaseRawConnection {
 
     this._sendData(wb.unwrap());
 
-    let cardinality: number | void;
-    let inTypeId: uuid | void;
-    let outTypeId: uuid | void;
+    let cardinality: number | undefined;
+    let inTypeId: uuid | undefined;
+    let outTypeId: uuid | undefined;
     let inCodec: ICodec | null;
     let outCodec: ICodec | null;
     let capabilities: number = -1;