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src/lib/tools/appendHead.ts

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+
+import { Deferred } from "evt/tools/Deferred";
+
+export function appendHead(
+    params: {
+        type: "css";
+        href: string;
+    } | {
+        type: "javascript";
+        src: string;
+    }
+) {
+
+    const htmlElement = document.createElement(
+        (() => {
+            switch (params.type) {
+                case "css": return "link";
+                case "javascript": return "script";
+            }
+        })()
+    );
+
+    const dLoaded = new Deferred<void>();
+
+    htmlElement.addEventListener("load", () => dLoaded.resolve());
+
+    Object.assign(
+        htmlElement,
+        (() => {
+            switch (params.type) {
+                case "css": return {
+                    "href": params.href,
+                    "type": "text/css",
+                    "rel": "stylesheet",
+                    "media": "screen,print"
+                };
+                case "javascript": return {
+                    "src": params.src,
+                    "type": "text/javascript",
+                };
+            }
+        })()
+    );
+
+    document.getElementsByTagName("head")[0].appendChild(htmlElement);
+
+    return dLoaded.pr;
+
+}