Update

Kha/Tools/windows_x64/std/js/html/BeforeInstallPromptEvent.hx

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+package js.html;
+
+import js.lib.Promise;
+
+/**
+	The `BeforeInstallPromptEvent` is fired at the `Window.onbeforeinstallprompt` handler,
+	before a user is prompted to install a web site to a home screen.
+
+	@see https://developer.mozilla.org/en-US/docs/Web/API/BeforeInstallPromptEvent
+**/
+@:native("BeforeInstallPromptEvent")
+extern class BeforeInstallPromptEvent extends Event {
+
+	/** The platforms on which this event was dispatched. **/
+	final platforms: Array<String>;
+
+	/** The user's choice to the install prompt. **/
+	final userChoice: Promise<BeforeInstallPromptUserChoice>;
+
+	/** Creates a new `BeforeInstallPromptEvent`. **/
+	function new();
+
+	/** Shows the install prompt. **/
+	function prompt(): Promise<Dynamic>;
+}
+
+typedef BeforeInstallPromptUserChoice = {
+	final outcome: BeforeInstallPromptUserChoiceOutcome;
+}
+
+enum abstract BeforeInstallPromptUserChoiceOutcome(String) {
+	var Accepted = "accepted";
+	var Dismissed = "dismissed";
+}