diff --git a/src/logging/BaseLogger.ts b/src/logging/BaseLogger.ts
index c47329c2..60388f77 100644
--- a/src/logging/BaseLogger.ts
+++ b/src/logging/BaseLogger.ts
@@ -16,7 +16,7 @@ limitations under the License.
 */
 
 import {LogItem, LabelOrValues, FilterCreator, LogCallback} from "./LogItem";
-import {LogLevel, LogFilter} from "./LogFilter.js";
+import {LogLevel, LogFilter} from "./LogFilter";
 import {Platform} from "../platform/web/Platform.js";
 
 
diff --git a/src/logging/ConsoleLogger.js b/src/logging/ConsoleLogger.js
index aacbf132..4d3be73b 100644
--- a/src/logging/ConsoleLogger.js
+++ b/src/logging/ConsoleLogger.js
@@ -13,7 +13,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
-import {BaseLogger} from "./BaseLogger.js";
+import {BaseLogger} from "./BaseLogger";
 
 export class ConsoleLogger extends BaseLogger {
     _persistItem(item) {
diff --git a/src/logging/IDBLogger.js b/src/logging/IDBLogger.js
index 03c2bf88..2360b54c 100644
--- a/src/logging/IDBLogger.js
+++ b/src/logging/IDBLogger.js
@@ -22,7 +22,7 @@ import {
     iterateCursor,
     fetchResults,
 } from "../matrix/storage/idb/utils";
-import {BaseLogger} from "./BaseLogger.js";
+import {BaseLogger} from "./BaseLogger";
 
 export class IDBLogger extends BaseLogger {
     constructor(options) {
diff --git a/src/logging/LogItem.ts b/src/logging/LogItem.ts
index 0a896841..a77b7c3d 100644
--- a/src/logging/LogItem.ts
+++ b/src/logging/LogItem.ts
@@ -16,7 +16,7 @@ limitations under the License.
 */
 
 import {BaseLogger} from "./BaseLogger";
-import {LogLevel, LogFilter} from "./LogFilter.js";
+import {LogLevel, LogFilter} from "./LogFilter";
 
 type LogItemValues = {l: string; [key: string]: unknown};
 export type LabelOrValues = string | LogItemValues;
@@ -84,14 +84,14 @@ export class LogItem {
         }
     }
 
-    durationWithoutType(type) {
+    durationWithoutType(type: string) {
         if (this.duration) {
             return this.duration - this.durationOfType(type);
         }
         return null;
     }
 
-    durationOfType(type) {
+    durationOfType(type: string) {
         if (this._values.t === type) {
             return this.duration;
         } else if (this._children) {
diff --git a/src/logging/NullLogger.js b/src/logging/NullLogger.js
index 060212bd..12eec5c9 100644
--- a/src/logging/NullLogger.js
+++ b/src/logging/NullLogger.js
@@ -13,7 +13,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
-import {LogLevel} from "./LogFilter.js";
+import {LogLevel} from "./LogFilter";
 
 function noop () {}