1 files changed, 70 insertions, 0 deletions
diff --git a/src/templates/assets/javascripts/browser/script/index.ts b/src/templates/assets/javascripts/browser/script/index.ts
new file mode 100644
index 00000000..ef5c89e6
--- /dev/null
+++ b/src/templates/assets/javascripts/browser/script/index.ts
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import {
+  Observable,
+  defer,
+  finalize,
+  fromEvent,
+  map,
+  merge,
+  switchMap,
+  take,
+  throwError
+} from "rxjs"
+
+import { h } from "~/utilities"
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Create and load a `script` element
+ *
+ * This function returns an observable that will emit when the script was
+ * successfully loaded, or throw an error if it wasn't.
+ *
+ * @param src - Script URL
+ *
+ * @returns Script observable
+ */
+export function watchScript(src: string): Observable<void> {
+  const script = h("script", { src })
+  return defer(() => {
+    document.head.appendChild(script)
+    return merge(
+      fromEvent(script, "load"),
+      fromEvent(script, "error")
+        .pipe(
+          switchMap(() => (
+            throwError(() => new ReferenceError(`Invalid script: ${src}`))
+          ))
+        )
+    )
+      .pipe(
+        map(() => undefined),
+        finalize(() => document.head.removeChild(script)),
+        take(1)
+      )
+  })
+}