refactor: update command execute methods to return CommandResult | undefined

apps/web/src/lib/commands/media/add-media-asset.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import { toast } from "sonner";
 import type { MediaAsset } from "@/lib/media/types";
@@ -23,7 +23,7 @@ export class AddMediaAssetCommand extends Command {
 		this.assetId = generateUUID();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedAssets = [...editor.media.getAssets()];
 
@@ -80,6 +80,8 @@ export class AddMediaAssetCommand extends Command {
 					});
 				}
 			});
+
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/media/remove-media-asset.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type { MediaAsset } from "@/lib/media/types";
 import { storageService } from "@/services/storage/service";
@@ -18,7 +18,7 @@ export class RemoveMediaAssetCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		const assets = editor.media.getAssets();
 

apps/web/src/lib/commands/project/update-project-settings.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type { TProject, TProjectSettings } from "@/lib/project/types";
 
@@ -10,7 +10,7 @@ export class UpdateProjectSettingsCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		const activeProject = editor.project.getActive();
 		if (!activeProject) return;

apps/web/src/lib/commands/scene/create-scene.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type { TScene } from "@/lib/timeline";
 import { buildDefaultScene } from "@/lib/scenes";
@@ -14,7 +14,7 @@ export class CreateSceneCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedScenes = [...editor.scenes.getScenes()];
 
@@ -25,6 +25,7 @@ export class CreateSceneCommand extends Command {
 
 		const updatedScenes = [...this.savedScenes, this.createdScene];
 		editor.scenes.setScenes({ scenes: updatedScenes });
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/scene/delete-scene.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type { TScene } from "@/lib/timeline";
 import { canDeleteScene, getFallbackSceneAfterDelete } from "@/lib/scenes";
@@ -12,7 +12,7 @@ export class DeleteSceneCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		const scenes = editor.scenes.getScenes();
 		const activeScene = editor.scenes.getActiveScene();

apps/web/src/lib/commands/scene/move-bookmark.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type { TScene } from "@/lib/timeline";
 import { updateSceneInArray } from "@/lib/scenes";
@@ -14,7 +14,7 @@ export class MoveBookmarkCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		const activeScene = editor.scenes.getActiveScene();
 		const activeProject = editor.project.getActive();

apps/web/src/lib/commands/scene/remove-bookmark.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type { TScene } from "@/lib/timeline";
 import { updateSceneInArray } from "@/lib/scenes";
@@ -15,7 +15,7 @@ export class RemoveBookmarkCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		const activeScene = editor.scenes.getActiveScene();
 		const activeProject = editor.project.getActive();

apps/web/src/lib/commands/scene/rename-scene.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type { TScene } from "@/lib/timeline";
 import { updateSceneInArray } from "@/lib/scenes";
@@ -14,7 +14,7 @@ export class RenameSceneCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		const scenes = editor.scenes.getScenes();
 

apps/web/src/lib/commands/scene/toggle-bookmark.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type { TScene } from "@/lib/timeline";
 import { updateSceneInArray } from "@/lib/scenes";
@@ -12,7 +12,7 @@ export class ToggleBookmarkCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		const activeScene = editor.scenes.getActiveScene();
 		const activeProject = editor.project.getActive();

apps/web/src/lib/commands/scene/update-bookmark.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type { Bookmark, TScene } from "@/lib/timeline";
 import { updateSceneInArray } from "@/lib/scenes";
@@ -14,7 +14,7 @@ export class UpdateBookmarkCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		const activeScene = editor.scenes.getActiveScene();
 		const activeProject = editor.project.getActive();

apps/web/src/lib/commands/timeline/clipboard/paste.ts

@@ -33,7 +33,7 @@ export class PasteCommand extends Command {
 	}
 
 	execute(): CommandResult | undefined {
-		if (this.clipboardItems.length === 0) return;
+		if (this.clipboardItems.length === 0) return undefined;
 
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
@@ -123,6 +123,7 @@ export class PasteCommand extends Command {
 		if (this.pastedElements.length > 0) {
 			return { select: this.pastedElements };
 		}
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/delete-elements.ts

@@ -20,7 +20,7 @@ export class DeleteElementsCommand extends Command {
 		this.rippleEnabled = rippleEnabled;
 	}
 
-	execute(): CommandResult {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 

apps/web/src/lib/commands/timeline/element/duplicate-elements.ts

@@ -91,6 +91,7 @@ export class DuplicateElementsCommand extends Command {
 				select: this.duplicatedElements,
 			};
 		}
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/effects/add-effect.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import { isVisualElement, updateElementInTracks } from "@/lib/timeline";
 import type { TimelineTrack, VisualElement } from "@/lib/timeline";
@@ -38,7 +38,7 @@ export class AddClipEffectCommand extends Command {
 		this.effectType = effectType;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -59,6 +59,7 @@ export class AddClipEffectCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/effects/remove-effect.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import { isVisualElement, updateElementInTracks } from "@/lib/timeline";
 import type { TimelineTrack, VisualElement } from "@/lib/timeline";
@@ -36,7 +36,7 @@ export class RemoveClipEffectCommand extends Command {
 		this.effectId = effectId;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -54,6 +54,7 @@ export class RemoveClipEffectCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/effects/reorder-effect.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import { isVisualElement, updateElementInTracks } from "@/lib/timeline";
 import type { TimelineTrack, VisualElement } from "@/lib/timeline";
@@ -43,7 +43,7 @@ export class ReorderClipEffectsCommand extends Command {
 		this.toIndex = toIndex;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -62,6 +62,7 @@ export class ReorderClipEffectsCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/effects/toggle-effect.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import { isVisualElement, updateElementInTracks } from "@/lib/timeline";
 import type { TimelineTrack, VisualElement } from "@/lib/timeline";
@@ -38,7 +38,7 @@ export class ToggleClipEffectCommand extends Command {
 		this.effectId = effectId;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -56,6 +56,7 @@ export class ToggleClipEffectCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/effects/update-effect-params.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import { isVisualElement, updateElementInTracks } from "@/lib/timeline";
 import type { ParamValues } from "@/lib/params";
@@ -56,7 +56,7 @@ export class UpdateClipEffectParamsCommand extends Command {
 		this.params = params;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -75,6 +75,7 @@ export class UpdateClipEffectParamsCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/index.ts

@@ -10,6 +10,7 @@ export { ToggleElementsVisibilityCommand } from "./toggle-elements-visibility";
 export { ToggleElementsMutedCommand } from "./toggle-elements-muted";
 export { ToggleSourceAudioSeparationCommand } from "./toggle-source-audio-separation";
 export { MoveElementCommand } from "./move-elements";
+
 export * from "./keyframes";
 export * from "./effects";
 export * from "./masks";

apps/web/src/lib/commands/timeline/element/insert-element.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type {
 	CreateTimelineElement,
@@ -42,7 +42,7 @@ export class InsertElementCommand extends Command {
 	private element: CreateTimelineElement;
 	private placement: InsertElementPlacement;
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 

apps/web/src/lib/commands/timeline/element/keyframes/remove-effect-param-keyframe.ts

@@ -1,5 +1,5 @@
 import { EditorCore } from "@/core";
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { removeEffectParamKeyframe } from "@/lib/animation/effect-param-channel";
 import { updateElementInTracks } from "@/lib/timeline";
 import { isVisualElement } from "@/lib/timeline/element-utils";
@@ -34,7 +34,7 @@ export class RemoveEffectParamKeyframeCommand extends Command {
 		this.keyframeId = keyframeId;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -55,6 +55,7 @@ export class RemoveEffectParamKeyframeCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/keyframes/remove-keyframe.ts

@@ -5,7 +5,7 @@ import {
 	removeElementKeyframe,
 	resolveAnimationTarget,
 } from "@/lib/animation";
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { updateElementInTracks } from "@/lib/timeline";
 import type { AnimationPath, AnimationValue } from "@/lib/animation/types";
 import type { TimelineElement, TimelineTrack } from "@/lib/timeline";
@@ -108,7 +108,7 @@ export class RemoveKeyframeCommand extends Command {
 		this.keyframeId = keyframeId;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -125,6 +125,7 @@ export class RemoveKeyframeCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/keyframes/retime-keyframe.ts

@@ -1,6 +1,6 @@
 import { EditorCore } from "@/core";
 import { resolveAnimationTarget, retimeElementKeyframe } from "@/lib/animation";
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { updateElementInTracks } from "@/lib/timeline";
 import type { AnimationPath } from "@/lib/animation/types";
 import type { TimelineTrack } from "@/lib/timeline";
@@ -34,7 +34,7 @@ export class RetimeKeyframeCommand extends Command {
 		this.nextTime = nextTime;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -61,6 +61,7 @@ export class RetimeKeyframeCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/keyframes/upsert-effect-param-keyframe.ts

@@ -1,5 +1,5 @@
 import { EditorCore } from "@/core";
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { upsertEffectParamKeyframe } from "@/lib/animation/effect-param-channel";
 import { updateElementInTracks } from "@/lib/timeline";
 import { isVisualElement } from "@/lib/timeline/element-utils";
@@ -46,7 +46,7 @@ export class UpsertEffectParamKeyframeCommand extends Command {
 		this.keyframeId = keyframeId;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -71,6 +71,7 @@ export class UpsertEffectParamKeyframeCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/keyframes/upsert-keyframe.ts

@@ -1,5 +1,5 @@
 import { EditorCore } from "@/core";
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { resolveAnimationTarget, upsertPathKeyframe } from "@/lib/animation";
 import { updateElementInTracks } from "@/lib/timeline";
 import type { TimelineTrack } from "@/lib/timeline";
@@ -46,7 +46,7 @@ export class UpsertKeyframeCommand extends Command {
 		this.keyframeId = keyframeId;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -82,6 +82,7 @@ export class UpsertKeyframeCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/masks/remove-mask.ts

@@ -1,5 +1,5 @@
 import { EditorCore } from "@/core";
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { isMaskableElement, updateElementInTracks } from "@/lib/timeline";
 import type { TimelineTrack, MaskableElement } from "@/lib/timeline";
 
@@ -36,7 +36,7 @@ export class RemoveMaskCommand extends Command {
 		this.maskId = maskId;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -53,6 +53,7 @@ export class RemoveMaskCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/masks/toggle-mask-inverted.ts

@@ -1,5 +1,5 @@
 import { EditorCore } from "@/core";
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { isMaskableElement, updateElementInTracks } from "@/lib/timeline";
 import type { Mask } from "@/lib/masks/types";
 import type { TimelineTrack, MaskableElement } from "@/lib/timeline";
@@ -47,7 +47,7 @@ export class ToggleMaskInvertedCommand extends Command {
 		this.maskId = maskId;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -64,6 +64,7 @@ export class ToggleMaskInvertedCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/move-elements.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type {
 	TimelineTrack,
@@ -45,7 +45,7 @@ export class MoveElementCommand extends Command {
 		this.rippleEnabled = rippleEnabled;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -134,6 +134,7 @@ export class MoveElementCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/retime/update-element-retime.ts

@@ -1,7 +1,7 @@
 import { EditorCore } from "@/core";
 import { clampRetimeRate } from "@/lib/retime/rate";
 import { clampAnimationsToDuration } from "@/lib/animation";
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { getTimelineDurationForSourceSpan, getSourceSpanAtClipTime } from "@/lib/retime";
 import { isRetimableElement, updateElementInTracks } from "@/lib/timeline";
 import type { RetimeConfig, TimelineTrack } from "@/lib/timeline";
@@ -54,7 +54,7 @@ export class UpdateElementRetimeCommand extends Command {
 		this.retime = retime;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -103,6 +103,7 @@ export class UpdateElementRetimeCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/split-elements.ts

@@ -175,6 +175,7 @@ export class SplitElementsCommand extends Command {
 				select: this.rightSideElements,
 			};
 		}
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/toggle-elements-muted.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import type { TimelineTrack } from "@/lib/timeline";
 import { canElementHaveAudio } from "@/lib/timeline/element-utils";
 import { EditorCore } from "@/core";
@@ -10,7 +10,7 @@ export class ToggleElementsMutedCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 

apps/web/src/lib/commands/timeline/element/toggle-elements-visibility.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import type { TimelineTrack } from "@/lib/timeline";
 import { canElementBeHidden } from "@/lib/timeline/element-utils";
 import { EditorCore } from "@/core";
@@ -10,7 +10,7 @@ export class ToggleElementsVisibilityCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -36,6 +36,7 @@ export class ToggleElementsVisibilityCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/toggle-source-audio-separation.ts

@@ -1,5 +1,5 @@
 import { EditorCore } from "@/core";
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import {
 	buildSeparatedAudioElement,
 	canExtractSourceAudio,
@@ -25,7 +25,7 @@ export class ToggleSourceAudioSeparationCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -43,6 +43,9 @@ export class ToggleSourceAudioSeparationCommand extends Command {
 		if (!sourceElement) {
 			return;
 		}
+		if (sourceElement.type !== "video") {
+			return;
+		}
 
 		if (canRecoverSourceAudio({ element: sourceElement })) {
 			editor.timeline.updateTracks(
@@ -59,9 +62,7 @@ export class ToggleSourceAudioSeparationCommand extends Command {
 		const mediaAsset = editor
 			.media
 			.getAssets()
-			.find((asset) =>
-				sourceElement.type === "video" ? asset.id === sourceElement.mediaId : false,
-			);
+			.find((asset) => asset.id === sourceElement.mediaId);
 		if (!canExtractSourceAudio({ element: sourceElement, mediaAsset })) {
 			return;
 		}

apps/web/src/lib/commands/timeline/element/update-element-duration.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import type { TimelineTrack } from "@/lib/timeline";
 import { EditorCore } from "@/core";
 import { clampAnimationsToDuration } from "@/lib/animation";
@@ -24,7 +24,7 @@ export class UpdateElementDurationCommand extends Command {
 		this.duration = duration;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -46,6 +46,7 @@ export class UpdateElementDurationCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/update-element-start-time.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import type { TimelineTrack } from "@/lib/timeline";
 import { EditorCore } from "@/core";
 import { enforceMainTrackStart } from "@/lib/timeline/placement";
@@ -20,7 +20,7 @@ export class UpdateElementStartTimeCommand extends Command {
 		this.startTime = startTime;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -58,6 +58,7 @@ export class UpdateElementStartTimeCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/update-element-trim.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import type { TimelineTrack } from "@/lib/timeline";
 import { EditorCore } from "@/core";
 import { clampAnimationsToDuration } from "@/lib/animation";
@@ -38,7 +38,7 @@ export class UpdateElementTrimCommand extends Command {
 		this.rippleEnabled = rippleEnabled;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -104,6 +104,7 @@ export class UpdateElementTrimCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/element/update-element.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import type { TimelineElement, TimelineTrack } from "@/lib/timeline";
 import { EditorCore } from "@/core";
 import { updateElementInTracks } from "@/lib/timeline";
@@ -24,7 +24,7 @@ export class UpdateElementCommand extends Command {
 		this.updates = updates;
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -36,6 +36,7 @@ export class UpdateElementCommand extends Command {
 		});
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/track/add-track.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import type { TrackType, TimelineTrack } from "@/lib/timeline";
 import { generateUUID } from "@/utils/id";
 import { EditorCore } from "@/core";
@@ -19,7 +19,7 @@ export class AddTrackCommand extends Command {
 		this.trackId = generateUUID();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 
@@ -38,6 +38,7 @@ export class AddTrackCommand extends Command {
 		updatedTracks.splice(insertIndex, 0, newTrack);
 
 		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
 	}
 
 	undo(): void {

apps/web/src/lib/commands/timeline/track/remove-track.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import { EditorCore } from "@/core";
 import type { TimelineTrack } from "@/lib/timeline";
 import { getMainTrack } from "@/lib/timeline/placement";
@@ -10,7 +10,7 @@ export class RemoveTrackCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 		const targetTrack = this.savedState.find(

apps/web/src/lib/commands/timeline/track/toggle-track-mute.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import type { TimelineTrack } from "@/lib/timeline";
 import { EditorCore } from "@/core";
 import { canTrackHaveAudio } from "@/lib/timeline";
@@ -10,7 +10,7 @@ export class ToggleTrackMuteCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 

apps/web/src/lib/commands/timeline/track/toggle-track-visibility.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import type { TimelineTrack } from "@/lib/timeline";
 import { EditorCore } from "@/core";
 import { canTrackBeHidden } from "@/lib/timeline";
@@ -10,7 +10,7 @@ export class ToggleTrackVisibilityCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		const editor = EditorCore.getInstance();
 		this.savedState = editor.timeline.getTracks();
 

apps/web/src/lib/commands/timeline/tracks-snapshot.ts

@@ -1,4 +1,4 @@
-import { Command } from "@/lib/commands/base-command";
+import { Command, type CommandResult } from "@/lib/commands/base-command";
 import type { TimelineTrack } from "@/lib/timeline";
 import { EditorCore } from "@/core";
 
@@ -10,8 +10,9 @@ export class TracksSnapshotCommand extends Command {
 		super();
 	}
 
-	execute(): void {
+	execute(): CommandResult | undefined {
 		EditorCore.getInstance().timeline.updateTracks(this.after);
+		return undefined;
 	}
 
 	undo(): void {