diff --git a/src/observable/map/ApplyMap.ts b/src/observable/map/ApplyMap.ts
index 4d45b519..0fef91c9 100644
--- a/src/observable/map/ApplyMap.ts
+++ b/src/observable/map/ApplyMap.ts
@@ -17,9 +17,9 @@ limitations under the License.
 import {BaseObservableMap, BaseObservableMapConfig} from "./BaseObservableMap";
 import {SubscriptionHandle} from "../BaseObservable";
 import {config, Mapper, Updater, Comparator, Filter} from "./config";
-import {JoinedMap} from "./JoinedMap.js";
-import {MappedMap} from "./MappedMap.js";
-import {FilteredMap} from "./FilteredMap.js";
+import {JoinedMap} from "./JoinedMap";
+import {MappedMap} from "./MappedMap";
+import {FilteredMap} from "./FilteredMap";
 import {SortedMapList} from "../list/SortedMapList.js";
 
 
diff --git a/src/observable/map/BaseObservableMap.ts b/src/observable/map/BaseObservableMap.ts
index 206770ee..98781955 100644
--- a/src/observable/map/BaseObservableMap.ts
+++ b/src/observable/map/BaseObservableMap.ts
@@ -15,9 +15,9 @@ limitations under the License.
 */
 
 import {BaseObservable} from "../BaseObservable";
-import {JoinedMap} from "../map/JoinedMap.js";
-import {MappedMap} from "../map/MappedMap.js";
-import {FilteredMap} from "../map/FilteredMap.js";
+import {JoinedMap} from "../map/JoinedMap";
+import {MappedMap} from "../map/MappedMap";
+import {FilteredMap} from "../map/FilteredMap";
 import {SortedMapList} from "../list/SortedMapList.js";
 import {Mapper, Updater, Comparator, Filter} from "./config";
 
diff --git a/src/observable/map/FilteredMap.ts b/src/observable/map/FilteredMap.ts
index 613b1439..00006a6d 100644
--- a/src/observable/map/FilteredMap.ts
+++ b/src/observable/map/FilteredMap.ts
@@ -17,8 +17,8 @@ limitations under the License.
 import {BaseObservableMap, BaseObservableMapConfig} from "./BaseObservableMap";
 import {SubscriptionHandle} from "../BaseObservable";
 import {config, Mapper, Updater, Comparator, Filter} from "./config";
-import {JoinedMap} from "./JoinedMap.js";
-import {MappedMap} from "./MappedMap.js";
+import {JoinedMap} from "./JoinedMap";
+import {MappedMap} from "./MappedMap";
 import {SortedMapList} from "../list/SortedMapList.js";
 
 export class FilteredMap<K, V> extends BaseObservableMap<K, V> {
diff --git a/src/observable/map/JoinedMap.ts b/src/observable/map/JoinedMap.ts
index 1b145d85..bf9f8b97 100644
--- a/src/observable/map/JoinedMap.ts
+++ b/src/observable/map/JoinedMap.ts
@@ -16,8 +16,8 @@ limitations under the License.
 
 import {BaseObservableMap, BaseObservableMapConfig} from "./BaseObservableMap";
 import {config, Mapper, Updater, Comparator, Filter} from "./config";
-import {FilteredMap} from "./FilteredMap.js";
-import {MappedMap} from "./MappedMap.js";
+import {FilteredMap} from "./FilteredMap";
+import {MappedMap} from "./MappedMap";
 import {SortedMapList} from "../list/SortedMapList.js";
 import {SubscriptionHandle} from "../BaseObservable";
 
diff --git a/src/observable/map/LogMap.ts b/src/observable/map/LogMap.ts
index 2a084401..70fe623a 100644
--- a/src/observable/map/LogMap.ts
+++ b/src/observable/map/LogMap.ts
@@ -16,9 +16,9 @@ limitations under the License.
 
 import {BaseObservableMap, BaseObservableMapConfig} from "./BaseObservableMap";
 import {config, Mapper, Updater, Comparator, Filter} from "./config";
-import {FilteredMap} from "./FilteredMap.js";
-import {MappedMap} from "./MappedMap.js";
-import {JoinedMap} from "./JoinedMap.js";
+import {FilteredMap} from "./FilteredMap";
+import {MappedMap} from "./MappedMap";
+import {JoinedMap} from "./JoinedMap";
 import {SortedMapList} from "../list/SortedMapList.js";
 import {SubscriptionHandle} from "../BaseObservable";
 import {ILogItem, LabelOrValues} from "../../logging/types";
diff --git a/src/observable/map/MappedMap.ts b/src/observable/map/MappedMap.ts
index e37e313b..95f49c2b 100644
--- a/src/observable/map/MappedMap.ts
+++ b/src/observable/map/MappedMap.ts
@@ -16,8 +16,8 @@ limitations under the License.
 
 import {BaseObservableMap, BaseObservableMapConfig} from "./BaseObservableMap";
 import {config, Mapper, Updater, Comparator, Filter} from "./config";
-import {JoinedMap} from "./JoinedMap.js";
-import {FilteredMap} from "./FilteredMap.js";
+import {JoinedMap} from "./JoinedMap";
+import {FilteredMap} from "./FilteredMap";
 import {SortedMapList} from "../list/SortedMapList.js";
 import {SubscriptionHandle} from "../BaseObservable";
 
diff --git a/src/observable/map/ObservableMap.ts b/src/observable/map/ObservableMap.ts
index c49d31dc..950fb818 100644
--- a/src/observable/map/ObservableMap.ts
+++ b/src/observable/map/ObservableMap.ts
@@ -16,9 +16,9 @@ limitations under the License.
 
 import {BaseObservableMap, BaseObservableMapConfig} from "./BaseObservableMap";
 import {config, Mapper, Updater, Comparator, Filter} from "./config";
-import {JoinedMap} from "./JoinedMap.js";
-import {MappedMap} from "./MappedMap.js";
-import {FilteredMap} from "./FilteredMap.js";
+import {JoinedMap} from "./JoinedMap";
+import {MappedMap} from "./MappedMap";
+import {FilteredMap} from "./FilteredMap";
 import {SortedMapList} from "../list/SortedMapList.js";
 
 
diff --git a/src/observable/map/config.ts b/src/observable/map/config.ts
index 54e291e2..fab0bcf8 100644
--- a/src/observable/map/config.ts
+++ b/src/observable/map/config.ts
@@ -14,9 +14,9 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 import {BaseObservableMap, BaseObservableMapConfig} from "./BaseObservableMap";
-import {FilteredMap} from "./FilteredMap.js";
-import {MappedMap} from "./MappedMap.js";
-import {JoinedMap} from "./JoinedMap.js";
+import {FilteredMap} from "./FilteredMap";
+import {MappedMap} from "./MappedMap";
+import {JoinedMap} from "./JoinedMap";
 import {SortedMapList} from "../list/SortedMapList.js";