Use Array.isArray instead of instanceof Array for assertion (#1841)

Author: marcins

.changeset/clean-streets-clap.md

@@ -0,0 +1,5 @@
+---
+'@compiled/parcel-optimizer': patch
+---
+
+Use Array.isArray instead of instanceof for more reliable check.

packages/parcel-optimizer/src/index.ts

@@ -52,7 +52,7 @@ export default new Optimizer<ParcelOptimizerOpts, unknown>({
           return;
         }
 
-        assert(rules instanceof Array);
+        assert(Array.isArray(rules));
 
         for (const rule of rules) {
           styleRules.add(rule as string);