Replace instanceof checks with other logic

src/ol/colorlike.js

@@ -23,22 +23,9 @@ import {toString} from './color.js';
  * @api
  */
 export function asColorLike(color) {
-  if (isColorLike(color)) {
-    return /** @type {string|CanvasPattern|CanvasGradient} */ (color);
+  if (Array.isArray(color)) {
+    return toString(color);
   } else {
-    return toString(/** @type {import("./color.js").Color} */ (color));
+    return color;
   }
 }
-
-
-/**
- * @param {?} color The value that is potentially an {@link ol/colorlike~ColorLike}.
- * @return {boolean} The color is an {@link ol/colorlike~ColorLike}.
- */
-export function isColorLike(color) {
-  return (
-    typeof color === 'string' ||
-    color instanceof CanvasPattern ||
-    color instanceof CanvasGradient
-  );
-}