diff --git a/biome.json b/biome.json
index 97cc422c..b21c8ed4 100644
--- a/biome.json
+++ b/biome.json
@@ -34,7 +34,8 @@
       },
       "correctness": {
         "noUnusedVariables": "error",
-        "noUnusedImports": "error"
+        "noUnusedImports": "error",
+        "useImportExtensions": "error"
       }
     }
   },
diff --git a/packages/transport-http/src/transport.test.ts b/packages/transport-http/src/transport.test.ts
index f375ea85..3f50cc60 100644
--- a/packages/transport-http/src/transport.test.ts
+++ b/packages/transport-http/src/transport.test.ts
@@ -7,8 +7,8 @@ import {
   type MockInstance,
   vi,
 } from "vitest";
-import { runTransportContract } from "../../../tests/utils/transportContract";
-import { TransportHTTP } from "./transport";
+import { runTransportContract } from "../../../tests/utils/transportContract.ts";
+import { TransportHTTP } from "./transport.ts";
 
 let abortTimeoutSpy: MockInstance | undefined;
 beforeEach(() => {
diff --git a/packages/transport-node-serial/src/transport.test.ts b/packages/transport-node-serial/src/transport.test.ts
index b4144401..3345bbd0 100644
--- a/packages/transport-node-serial/src/transport.test.ts
+++ b/packages/transport-node-serial/src/transport.test.ts
@@ -2,8 +2,8 @@ import { Duplex } from "node:stream";
 import { Types, Utils } from "@meshtastic/core";
 import type { SerialPort } from "serialport";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
-import { runTransportContract } from "../../../tests/utils/transportContract";
-import { TransportNodeSerial } from "./transport";
+import { runTransportContract } from "../../../tests/utils/transportContract.ts";
+import { TransportNodeSerial } from "./transport.ts";
 
 function isStatusEvent(
   output: Types.DeviceOutput | undefined,
diff --git a/packages/transport-node/src/transport.test.ts b/packages/transport-node/src/transport.test.ts
index 3519547d..ae9d5feb 100644
--- a/packages/transport-node/src/transport.test.ts
+++ b/packages/transport-node/src/transport.test.ts
@@ -2,8 +2,8 @@ import type { Socket } from "node:net";
 import { Duplex } from "node:stream";
 import { Types, Utils } from "@meshtastic/core";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
-import { runTransportContract } from "../../../tests/utils/transportContract";
-import { TransportNode } from "./transport";
+import { runTransportContract } from "../../../tests/utils/transportContract.ts";
+import { TransportNode } from "./transport.ts";
 
 function isStatusEvent(
   out: Types.DeviceOutput | undefined,
diff --git a/packages/transport-web-bluetooth/src/transport.test.ts b/packages/transport-web-bluetooth/src/transport.test.ts
index 2d810f75..a3727096 100644
--- a/packages/transport-web-bluetooth/src/transport.test.ts
+++ b/packages/transport-web-bluetooth/src/transport.test.ts
@@ -1,6 +1,6 @@
 import { describe, expect, vi } from "vitest";
-import { runTransportContract } from "../../../tests/utils/transportContract";
-import { TransportWebBluetooth } from "./transport";
+import { runTransportContract } from "../../../tests/utils/transportContract.ts";
+import { TransportWebBluetooth } from "./transport.ts";
 
 class MiniEmitter {
   private listeners = new Map<string, Set<(e: Event) => void>>();
diff --git a/packages/transport-web-serial/src/transport.test.ts b/packages/transport-web-serial/src/transport.test.ts
index 92dcd2a7..dbf4ef71 100644
--- a/packages/transport-web-serial/src/transport.test.ts
+++ b/packages/transport-web-serial/src/transport.test.ts
@@ -1,7 +1,7 @@
 import { Types, Utils } from "@meshtastic/core";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
-import { runTransportContract } from "../../../tests/utils/transportContract";
-import { TransportWebSerial } from "./transport";
+import { runTransportContract } from "../../../tests/utils/transportContract.ts";
+import { TransportWebSerial } from "./transport.ts";
 
 function stubCoreTransforms() {
   const toDevice = new TransformStream<Uint8Array, Uint8Array>({
diff --git a/packages/web/src/core/stores/nodeDBStore/index.ts b/packages/web/src/core/stores/nodeDBStore/index.ts
index c5cdb0d2..ccda39f0 100644
--- a/packages/web/src/core/stores/nodeDBStore/index.ts
+++ b/packages/web/src/core/stores/nodeDBStore/index.ts
@@ -5,7 +5,7 @@ import { Protobuf, type Types } from "@meshtastic/core";
 import { produce } from "immer";
 import { create as createStore, type StateCreator } from "zustand";
 import { type PersistOptions, persist } from "zustand/middleware";
-import type { NodeError, NodeErrorType, ProcessPacketParams } from "./types";
+import type { NodeError, NodeErrorType, ProcessPacketParams } from "./types.ts";
 
 const CURRENT_STORE_VERSION = 0;
 const NODEDB_RETENTION_NUM = 10;
diff --git a/packages/web/src/core/stores/nodeDBStore/nodeDBStore.test.ts b/packages/web/src/core/stores/nodeDBStore/nodeDBStore.test.ts
index 5f9702fa..6acf7c18 100644
--- a/packages/web/src/core/stores/nodeDBStore/nodeDBStore.test.ts
+++ b/packages/web/src/core/stores/nodeDBStore/nodeDBStore.test.ts
@@ -16,7 +16,7 @@ vi.mock("idb-keyval", () => ({
 // import a fresh copy of the store module (because the store is created at import time)
 async function freshStore() {
   vi.resetModules();
-  const mod = await import("../nodeDBStore");
+  const mod = await import("./index.ts");
   return mod;
 }
 
diff --git a/packages/web/src/core/stores/utils/indexDB.test.ts b/packages/web/src/core/stores/utils/indexDB.test.ts
index 94c143d9..ac089a36 100644
--- a/packages/web/src/core/stores/utils/indexDB.test.ts
+++ b/packages/web/src/core/stores/utils/indexDB.test.ts
@@ -1,6 +1,6 @@
 import * as idb from "idb-keyval";
 import { beforeEach, describe, expect, it, vi } from "vitest";
-import { createStorage } from "./indexDB";
+import { createStorage } from "./indexDB.ts";
 
 type PersistStorage<T> = ReturnType<typeof createStorage<T>>;