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-rw-r--r--ext/js/display/display-history.js4
1 files changed, 3 insertions, 1 deletions
diff --git a/ext/js/display/display-history.js b/ext/js/display/display-history.js
index 71882ca3..a983346c 100644
--- a/ext/js/display/display-history.js
+++ b/ext/js/display/display-history.js
@@ -16,7 +16,9 @@
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
-class DisplayHistory extends EventDispatcher {
+import {EventDispatcher, generateId, isObject} from '../core.js';
+
+export class DisplayHistory extends EventDispatcher {
constructor({clearable=true, useBrowserHistory=false}) {
super();
this._clearable = clearable;