diff --git a/src/domain/session/room/timeline/TilesCollection.js b/src/domain/session/room/timeline/TilesCollection.js
index 0acb2859..10062af2 100644
--- a/src/domain/session/room/timeline/TilesCollection.js
+++ b/src/domain/session/room/timeline/TilesCollection.js
@@ -219,7 +219,7 @@ export class TilesCollection extends BaseObservableList {
         }
     }
 
-    onMove(fromIdx, toIdx, value) {
+    onMove(/*fromIdx, toIdx, value*/) {
         // this ... cannot happen in the timeline?
         // perhaps we can use this event to support a local echo (in a different fragment)
         // to be moved to the key of the remote echo, so we don't loose state ... ?
diff --git a/src/domain/session/room/timeline/TimelineViewModel.js b/src/domain/session/room/timeline/TimelineViewModel.js
index 7b2765f5..a08ab060 100644
--- a/src/domain/session/room/timeline/TimelineViewModel.js
+++ b/src/domain/session/room/timeline/TimelineViewModel.js
@@ -59,7 +59,7 @@ export class TimelineViewModel extends ViewModel {
         }
     }
 
-    unloadAtTop(tileAmount) {
+    unloadAtTop(/*tileAmount*/) {
         // get lowerSortKey for tile at index tileAmount - 1
         // tell timeline to unload till there (included given key)
     }
@@ -68,7 +68,7 @@ export class TimelineViewModel extends ViewModel {
 
     }
 
-    unloadAtBottom(tileAmount) {
+    unloadAtBottom(/*tileAmount*/) {
         // get upperSortKey for tile at index tiles.length - tileAmount
         // tell timeline to unload till there (included given key)
     }
diff --git a/src/domain/session/room/timeline/tiles/SimpleTile.js b/src/domain/session/room/timeline/tiles/SimpleTile.js
index 68037a14..3c370b72 100644
--- a/src/domain/session/room/timeline/tiles/SimpleTile.js
+++ b/src/domain/session/room/timeline/tiles/SimpleTile.js
@@ -101,7 +101,7 @@ export class SimpleTile extends ViewModel {
 
     // return whether the tile should be removed
     // as SimpleTile only has one entry, the tile should be removed
-    removeEntry(entry) {
+    removeEntry(/*entry*/) {
         return true;
     }
 
@@ -110,12 +110,12 @@ export class SimpleTile extends ViewModel {
         return false;
     }
     // let item know it has a new sibling
-    updatePreviousSibling(prev) {
+    updatePreviousSibling(/*prev*/) {
 
     }
 
     // let item know it has a new sibling
-    updateNextSibling(next) {
+    updateNextSibling(/*next*/) {
     
     }
 
diff --git a/src/matrix/room/timeline/persistence/RelationWriter.js b/src/matrix/room/timeline/persistence/RelationWriter.js
index 4944cc64..afc99e6d 100644
--- a/src/matrix/room/timeline/persistence/RelationWriter.js
+++ b/src/matrix/room/timeline/persistence/RelationWriter.js
@@ -147,7 +147,7 @@ export class RelationWriter {
         return true;
     }
 
-    _aggregateAnnotation(annotationEvent, targetStorageEntry, log) {
+    _aggregateAnnotation(annotationEvent, targetStorageEntry/*, log*/) {
         // TODO: do we want to verify it is a m.reaction event somehow?
         const relation = getRelation(annotationEvent);
         if (!relation) {
diff --git a/src/observable/map/MappedMap.js b/src/observable/map/MappedMap.js
index 47013df8..2a810058 100644
--- a/src/observable/map/MappedMap.js
+++ b/src/observable/map/MappedMap.js
@@ -42,7 +42,7 @@ export class MappedMap extends BaseObservableMap {
         this.emitAdd(key, mappedValue);
     }
 
-    onRemove(key, _value) {
+    onRemove(key/*, _value*/) {
         const mappedValue = this._mappedValues.get(key);
         if (this._mappedValues.delete(key)) {
             this.emitRemove(key, mappedValue);
diff --git a/src/observable/map/ObservableMap.js b/src/observable/map/ObservableMap.js
index b72cd039..8f5a0922 100644
--- a/src/observable/map/ObservableMap.js
+++ b/src/observable/map/ObservableMap.js
@@ -156,7 +156,7 @@ export function tests() {
                     assert.equal(key, 1);
                     assert.deepEqual(value, {value: 5}); 
                 },
-                onUpdate(key, value, params) {
+                onUpdate(key, value/*, params*/) {
                     update_fired += 1;
                     assert.equal(key, 1);
                     assert.deepEqual(value, {value: 7}); 
diff --git a/src/platform/web/Platform.js b/src/platform/web/Platform.js
index 7e28f36f..40f47101 100644
--- a/src/platform/web/Platform.js
+++ b/src/platform/web/Platform.js
@@ -221,7 +221,7 @@ export class Platform {
         if (mimeType) {
             input.setAttribute("accept", mimeType);
         }
-        const promise = new Promise((resolve, reject) => {
+        const promise = new Promise(resolve => {
             const checkFile = () => {
                 input.removeEventListener("change", checkFile, true);
                 const file = input.files[0];
diff --git a/src/platform/web/ui/general/ListView.js b/src/platform/web/ui/general/ListView.js
index 884eedc4..74aa9d87 100644
--- a/src/platform/web/ui/general/ListView.js
+++ b/src/platform/web/ui/general/ListView.js
@@ -121,7 +121,7 @@ export class ListView {
         this.onListChanged();
     }
 
-    onRemove(idx, _value) {
+    onRemove(idx/*, _value*/) {
         this.onBeforeListChanged();
         const [child] = this._childInstances.splice(idx, 1);
         child.root().remove();
@@ -129,7 +129,7 @@ export class ListView {
         this.onListChanged();
     }
 
-    onMove(fromIdx, toIdx, value) {
+    onMove(fromIdx, toIdx/*, value*/) {
         this.onBeforeListChanged();
         const [child] = this._childInstances.splice(fromIdx, 1);
         this._childInstances.splice(toIdx, 0, child);
diff --git a/src/platform/web/ui/session/room/MessageComposer.js b/src/platform/web/ui/session/room/MessageComposer.js
index e1d8f13c..c6e8a1ee 100644
--- a/src/platform/web/ui/session/room/MessageComposer.js
+++ b/src/platform/web/ui/session/room/MessageComposer.js
@@ -17,7 +17,6 @@ limitations under the License.
 import {TemplateView} from "../../general/TemplateView.js";
 import {Popup} from "../../general/Popup.js";
 import {Menu} from "../../general/Menu.js";
-import {TextMessageView} from "./timeline/TextMessageView.js";
 import {viewClassForEntry} from "./TimelineList.js"
 
 export class MessageComposer extends TemplateView {
diff --git a/src/platform/web/ui/session/room/RoomArchivedView.js b/src/platform/web/ui/session/room/RoomArchivedView.js
index e5e489ed..80b18a08 100644
--- a/src/platform/web/ui/session/room/RoomArchivedView.js
+++ b/src/platform/web/ui/session/room/RoomArchivedView.js
@@ -17,7 +17,7 @@ limitations under the License.
 import {TemplateView} from "../../general/TemplateView.js";
 
 export class RoomArchivedView extends TemplateView {
-    render(t, vm) {
+    render(t) {
         return t.div({className: "RoomArchivedView"}, t.h3(vm => vm.description));
     }
-}
\ No newline at end of file
+}
diff --git a/src/platform/web/ui/session/room/timeline/TextMessageView.js b/src/platform/web/ui/session/room/timeline/TextMessageView.js
index ef4d61d5..fcafaf27 100644
--- a/src/platform/web/ui/session/room/timeline/TextMessageView.js
+++ b/src/platform/web/ui/session/room/timeline/TextMessageView.js
@@ -97,7 +97,7 @@ const formatFunction = {
     link: linkPart => tag.a({href: linkPart.url, className: "link", target: "_blank", rel: "noopener" }, renderParts(linkPart.inlines)),
     pill: renderPill,
     format: formatPart => tag[formatPart.format](renderParts(formatPart.children)),
-    rule: rulePart => tag.hr(),
+    rule: () => tag.hr(),
     list: renderList,
     image: renderImage,
     newline: () => tag.br()
diff --git a/src/utils/EventEmitter.js b/src/utils/EventEmitter.js
index 2d2e4458..5dd56ac3 100644
--- a/src/utils/EventEmitter.js
+++ b/src/utils/EventEmitter.js
@@ -55,9 +55,9 @@ export class EventEmitter {
         }
     }
 
-    onFirstSubscriptionAdded(name) {}
+    onFirstSubscriptionAdded(/* name */) {}
 
-    onLastSubscriptionRemoved(name) {}
+    onLastSubscriptionRemoved(/* name */) {}
 }
 
 export function tests() {