feat: add polyfills insertion for ES Next used features

libraries/stdlib/js-ir/runtime/globalThis.kt

@@ -5,7 +5,7 @@
 
 package kotlin.js
 
-@JsNativeImplementation("""
+@JsPolyfill("""
 (function() {
     if (typeof globalThis === 'object') return; 
     Object.defineProperty(Object.prototype, '__magic__', {

libraries/stdlib/js-ir/runtime/math.kt

@@ -5,8 +5,8 @@
 @file:JsQualifier("Math")
 package kotlin.js
 
-@JsNativeImplementation("""
-if (typeof Math == "object" && Math !== null & typeof Math.imul === "undefined") {
+@JsPolyfill("""
+if (typeof Math.imul === "undefined") {
   Math.imul = function imul(a, b) {
     return ((a & 0xffff0000) * (b & 0xffff) + (a & 0xffff) * (b | 0)) | 0; 
   }

libraries/stdlib/js-ir/runtime/typeCheckUtils.kt

@@ -142,9 +142,7 @@ internal fun isArray(obj: Any): Boolean {
     return isJsArray(obj) && !(obj.asDynamic().`$type$`)
 }
 
-internal fun isArrayish(o: dynamic) =
-    isJsArray(o) || js("ArrayBuffer").isView(o).unsafeCast<Boolean>()
-
+internal fun isArrayish(o: dynamic) = isJsArray(o) || arrayBufferIsView(o)
 
 internal fun isChar(@Suppress("UNUSED_PARAMETER") c: Any): Boolean {
     error("isChar is not implemented")