diff --git a/src/vs/base/browser/ui/list/listView.ts b/src/vs/base/browser/ui/list/listView.ts
index b130bf031870c9133457669d7ac10b87a7007fbc..cebe3e632e4b1b9328a67a60132a8ee356cf7c92 100644
--- a/src/vs/base/browser/ui/list/listView.ts
+++ b/src/vs/base/browser/ui/list/listView.ts
@@ -65,7 +65,7 @@ export class ListView<T> implements IDisposable {
 		this.items = [];
 		this.itemId = 0;
 		this.rangeMap = new RangeMap();
-		this.renderers = toObject<IRenderer<T, any>, IRenderer<T, any>>(renderers, r => r.templateId);
+		this.renderers = toObject<IRenderer<T, any>>(renderers, r => r.templateId);
 		this.cache = new RowCache(this.renderers);
 
 		this.lastRenderTop = 0;
diff --git a/src/vs/base/browser/ui/list/listWidget.ts b/src/vs/base/browser/ui/list/listWidget.ts
index 791f6ab7ab82ec3da3a963a11d7eb0249971dafc..5b60f371aa3de36dc7f0efab1f2fa7c089abf68d 100644
--- a/src/vs/base/browser/ui/list/listWidget.ts
+++ b/src/vs/base/browser/ui/list/listWidget.ts
@@ -51,7 +51,7 @@ class TraitRenderer<T, D> implements IRenderer<T, ITraitTemplateData<D>>
 		private renderer: IRenderer<T, D>
 	) { }
 
-	public get templateId(): string {
+	get templateId(): string {
 		return this.renderer.templateId;
 	}
 
diff --git a/src/vs/base/common/objects.ts b/src/vs/base/common/objects.ts
index 8b818c3c69b7f41fc25bc181fc4098776e9be9b1..c073ced725f5570d7a39ab19891df1767cdfbf27 100644
--- a/src/vs/base/common/objects.ts
+++ b/src/vs/base/common/objects.ts
@@ -148,8 +148,8 @@ export function assign(destination: any, ...sources: any[]): any {
 	return destination;
 }
 
-export function toObject<T, R>(arr: T[], keyMap: (T) => string, valueMap: (T) => R = x => x): { [key: string]: R } {
-	return arr.reduce((o, d) => assign(o, { [keyMap(d)]: valueMap(d) }), Object.create(null));
+export function toObject<T>(arr: T[], keyMap: (t: T) => string): { [key: string]: T } {
+	return arr.reduce((o, d) => assign(o, { [keyMap(d)]: d }), Object.create(null));
 }
 
 export function equals(one: any, other: any): boolean {