From 2a499cec42f61dcab5d68c74f412e9e116c7c962 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20K=C4=99drzy=C5=84ski?= <kedrzu@gmail.com>
Date: Wed, 12 Jul 2023 09:05:10 +0200
Subject: [PATCH] feat(dom): added loadScript helper

---
 packages/dom/src/index.ts      |  1 +
 packages/dom/src/loadScript.ts | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 packages/dom/src/loadScript.ts

diff --git a/packages/dom/src/index.ts b/packages/dom/src/index.ts
index fdd7d84..e8a14ee 100644
--- a/packages/dom/src/index.ts
+++ b/packages/dom/src/index.ts
@@ -2,5 +2,6 @@ export * from './virtualHistory.js';
 export * from './requestIdleCallback.js';
 export * from './isBrowser.js';
 export * from './localStorageUtils.js';
+export * from './loadScript.js';
 export * from './getOuterHeight.js';
 export * from './scrollToTopElement.js';
diff --git a/packages/dom/src/loadScript.ts b/packages/dom/src/loadScript.ts
new file mode 100644
index 0000000..1f03df9
--- /dev/null
+++ b/packages/dom/src/loadScript.ts
@@ -0,0 +1,23 @@
+const scripts: { [key: string]: Promise<void> | undefined } = {};
+
+/**
+ * Loads a given script into the page.
+ * If script was already loaded, it won't load it again
+ */
+export function loadScript(url: string) {
+    if (scripts[url]) {
+        return scripts[url];
+    }
+
+    const scriptTag = document.createElement('script');
+
+    return new Promise<void>((resolve, reject) => {
+        scriptTag.src = url;
+        scriptTag.onload = () => resolve();
+        scriptTag.onerror = () => {
+            document.body.removeChild(scriptTag);
+            reject();
+        };
+        document.body.appendChild(scriptTag);
+    });
+}