Remove unnecessary typecasts in constructors options

src/ol/layer/BaseVector.js

@@ -72,8 +72,7 @@ class BaseVectorLayer extends Layer {
    * @param {Options=} opt_options Options.
    */
   constructor(opt_options) {
-    const options = opt_options ?
+    const options = opt_options ? opt_options : {};
-      opt_options : /** @type {Options} */ ({});
 
     const baseOptions = assign({}, options);
 

src/ol/layer/VectorImage.js

@@ -60,7 +60,7 @@ class VectorImageLayer extends BaseVectorLayer {
    * @param {Options=} opt_options Options.
    */
   constructor(opt_options) {
-    const options = opt_options ? opt_options : /** @type {Options} */ ({});
+    const options = opt_options ? opt_options : {};
 
     const baseOptions = assign({}, options);
     delete baseOptions.imageRatio;

src/ol/source/ImageArcGISRest.js

@@ -56,7 +56,7 @@ class ImageArcGISRest extends ImageSource {
    */
   constructor(opt_options) {
 
-    const options = opt_options || /** @type {Options} */ ({});
+    const options = opt_options ? opt_options : {};
 
     super({
       attributions: options.attributions,

src/ol/source/ImageCanvas.js

@@ -53,7 +53,7 @@ class ImageCanvasSource extends ImageSource {
    */
   constructor(opt_options) {
 
-    const options = opt_options || /** @type {Options} */ ({});
+    const options = opt_options ? opt_options : {};
 
     super({
       attributions: options.attributions,

src/ol/source/ImageWMS.js

@@ -63,7 +63,7 @@ class ImageWMS extends ImageSource {
    */
   constructor(opt_options) {
 
-    const options = opt_options || /** @type {Options} */ ({});
+    const options = opt_options ? opt_options : {};
 
     super({
       attributions: options.attributions,

src/ol/source/TileArcGISRest.js

@@ -64,7 +64,7 @@ class TileArcGISRest extends TileImage {
    */
   constructor(opt_options) {
 
-    const options = opt_options || /** @type {Options} */ ({});
+    const options = opt_options ? opt_options : {};
 
     super({
       attributions: options.attributions,

src/ol/source/TileWMS.js

@@ -81,7 +81,7 @@ class TileWMS extends TileImage {
    */
   constructor(opt_options) {
 
-    const options = opt_options || /** @type {Options} */ ({});
+    const options = opt_options ? opt_options : {};
 
     const params = options.params || {};
 

src/ol/style/Circle.js

@@ -24,7 +24,7 @@ class CircleStyle extends RegularShape {
    */
   constructor(opt_options) {
 
-    const options = opt_options || /** @type {Options} */ ({});
+    const options = opt_options ? opt_options : {};
 
     super({
       points: Infinity,