1 files changed, 27 insertions, 0 deletions
diff --git a/src/content/Bootstrap.ts b/src/content/Bootstrap.ts
new file mode 100644
index 0000000..62e1530
--- /dev/null
+++ b/src/content/Bootstrap.ts
@@ -0,0 +1,27 @@
+type Callback = () => void;
+
+export default class Bootstrap {
+  constructor() {}
+
+  isReady(): boolean {
+    return document.body !== null;
+  }
+
+  waitForReady(callback: Callback): void {
+    const observer = new MutationObserver(() => {
+      if (document.body != null) {
+        observer.disconnect();
+        callback();
+      }
+    });
+
+    observer.observe(document, {
+      attributes: false,
+      attributeOldValue: false,
+      characterData: false,
+      characterDataOldValue: false,
+      childList: true,
+      subtree: true,
+    });
+  }
+}