change option name to imageSmoothing

src/ol/source/common.js

@@ -7,3 +7,12 @@
  * @type {string}
  */
 export const DEFAULT_WMS_VERSION = '1.3.0';
+
+/**
+ * Context options to disable image smoothing.
+ * @type {Object}
+ */
+export const IMAGE_SMOOTHING_DISABLED = {
+  imageSmoothingEnabled: false,
+  msImageSmoothingEnabled: false
+};