Commit pirate JS files

js/AsyncResourceLoader.js

@@ -0,0 +1,75 @@
+/*
+Copyright (c) 2023-forever Douglas Malnati. All rights reserved.
+
+See the /faq/tos page for details.
+    
+(If this generated header is stamped on a file which is a 3rd party file or under a different license or copyright, then ignore this copyright statement and use that file's terms.)
+*/
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Cache subsequent loads for the same resource, which all takes their own
+// load time, even when the url is the same.
+///////////////////////////////////////////////////////////////////////////////
+
+export class AsyncResourceLoader
+{
+    static url__scriptPromise = new Map();
+    static AsyncLoadScript(url)
+    {
+        if (this.url__scriptPromise.has(url) == false)
+        {
+            let p = new Promise((resolve, reject) => {
+                const script = document.createElement('script');
+                script.src = url;
+                script.async = true;
+                
+                script.onload = () => {
+                    resolve();
+                };
+
+                script.onerror = (message) => {
+                    reject(new Error(message));
+                }
+    
+                document.body.appendChild(script);
+            });
+
+            this.url__scriptPromise.set(url, p);
+        }
+
+        let p = this.url__scriptPromise.get(url);
+
+        return p;
+    }
+
+    static url__stylesheetPromise = new Map();
+    static AsyncLoadStylesheet(url)
+    {
+        if (this.url__stylesheetPromise.has(url) == false)
+        {
+            let p = new Promise((resolve, reject) => {
+                const link = document.createElement('link');
+                link.rel = "stylesheet";
+                link.href = url;
+                link.async = true;
+        
+                link.onload = () => {
+                    resolve();
+                };
+
+                link.onerror = (message) => {
+                    reject(new Error(message));
+                };
+    
+                document.body.appendChild(link);
+            });
+
+            this.url__stylesheetPromise.set(url, p);
+        }
+
+        let p = this.url__stylesheetPromise.get(url);
+
+        return p;
+    }
+}