Fixing the Issues with Targetables on Release blocker (#4561)

* Fixing the Issues with Targetables on Release blocker

* Fixing Prettier Issues

Author: del15881

packages/pwa-buildpack/lib/WebpackTools/targetables/TargetableSet.js

@@ -24,7 +24,15 @@ class TargetableSet {
     }
     /** @hideconstructor  */
     constructor(targetProvider) {
-        if (!(targetProvider instanceof TargetProvider)) {
+        const isValidTargetProvider =
+            targetProvider instanceof TargetProvider ||
+            (targetProvider &&
+                typeof targetProvider === 'object' &&
+                typeof targetProvider.of === 'function' &&
+                typeof targetProvider.name === 'string' &&
+                targetProvider.constructor.name === 'TargetProvider');
+
+        if (!isValidTargetProvider) {
             throw new Error(
                 'Must supply a TargetProvider to a new TargetableSet.'
             );