diff --git a/src/loaders/LoadingManager.d.ts b/src/loaders/LoadingManager.d.ts
index 9cf69f9bcff7ca960d3eef52104d9d8008e2f0b0..bbc09390bb18081264dab8873e0954e06118db75 100644
--- a/src/loaders/LoadingManager.d.ts
+++ b/src/loaders/LoadingManager.d.ts
@@ -32,7 +32,7 @@ export class LoadingManager {
   constructor(
     onLoad?: () => void,
     onProgress?: (url: string, loaded: number, total: number) => void,
-    onError?: () => void
+    onError?: (url: string) => void
   );
 
   onStart?: (url: string, loaded: number, total: number) => void;
diff --git a/src/objects/Line.d.ts b/src/objects/Line.d.ts
index ae75ff33277b44e839daf018596bd213c217ee9f..9b3e0e4bb9795d524e05ea5c80ecde58e4ce00e4 100644
--- a/src/objects/Line.d.ts
+++ b/src/objects/Line.d.ts
@@ -15,7 +15,7 @@ export class Line extends Object3D {
   geometry: Geometry | BufferGeometry;
   material: Material | Material[];
 
-  type: 'Line';
+  type: 'Line' | 'LineLoop' | 'LineSegments';
   isLine: true;
 
   computeLineDistances(): this;
diff --git a/src/objects/LineLoop.d.ts b/src/objects/LineLoop.d.ts
index 1eedd9254157865b521b9115259bdc9d27128f5a..e6a5afa8a692bafce2210fe433de92356e88e185 100644
--- a/src/objects/LineLoop.d.ts
+++ b/src/objects/LineLoop.d.ts
@@ -8,4 +8,7 @@ export class LineLoop extends Line {
     geometry?: Geometry | BufferGeometry,
     material?: Material | Material[]
   );
+
+  type: 'LineLoop';
+  isLineLoop: true;
 }
diff --git a/src/objects/LineSegments.d.ts b/src/objects/LineSegments.d.ts
index ab5fd856418c717599587d2dcede6774bf51bc92..67b32870ad7a3c5bde94dbbd8dc1b308c15491b4 100644
--- a/src/objects/LineSegments.d.ts
+++ b/src/objects/LineSegments.d.ts
@@ -18,4 +18,7 @@ export class LineSegments extends Line {
     material?: Material | Material[],
     mode?: number
   );
+
+  type: 'LineSegments';
+  isLineSegments: true;
 }
diff --git a/src/renderers/WebGLRenderer.d.ts b/src/renderers/WebGLRenderer.d.ts
index 5f93afcc9073d93d3dc526d515e3dcf8fbd29dfe..5a58d5a3777209028e391abefdc4c70f47e602b1 100644
--- a/src/renderers/WebGLRenderer.d.ts
+++ b/src/renderers/WebGLRenderer.d.ts
@@ -70,16 +70,14 @@ export interface WebGLRendererParameters {
   preserveDrawingBuffer?: boolean;
 
   /**
-   * default is 0x000000.
+   *  Can be "high-performance", "low-power" or "default"
    */
-  clearColor?: number;
+  powerPreference?: string;
 
   /**
-   * default is 0.
+   * default is true.
    */
-  clearAlpha?: number;
-
-  devicePixelRatio?: number;
+  depth?: boolean;
 
   /**
    * default is false.