Fixes for SVGLoader typescript definitions, based on the js code and comments

examples/jsm/loaders/SVGLoader.d.ts

@@ -29,8 +29,8 @@ export class SVGLoader extends Loader {
 	load( url: string, onLoad: ( data: SVGResult ) => void, onProgress?: ( event: ProgressEvent ) => void, onError?: ( event: ErrorEvent ) => void ) : void;
 	parse( text: string ) : SVGResult;
 
-	static getStrokeStyle( width: number, color: string, lineJoin: string, lineCap: string, miterLimit: number ): StrokeStyle;
-	static pointsToStroke( points: Vector3[], style: StrokeStyle, arcDivisions: number, minDistance: number ): BufferGeometry;
-	static pointsToStrokeWithBuffers( points: Vector3[], style: StrokeStyle, arcDivisions: number, minDistance: number, vertices: number[], normals: number[], uvs: number[], vertexOffset: number ): number;
+	static getStrokeStyle( width?: number, color?: string, lineJoin?: string, lineCap?: string, miterLimit?: number ): StrokeStyle;
+	static pointsToStroke( points: Vector3[], style: StrokeStyle, arcDivisions?: number, minDistance?: number ): BufferGeometry;
+	static pointsToStrokeWithBuffers( points: Vector3[], style: StrokeStyle, arcDivisions?: number, minDistance?: number, vertices?: number[], normals?: number[], uvs?: number[], vertexOffset?: number ): number;
 
 }