chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

app/utils/isTextInput.ts

@@ -0,0 +1,10 @@
+const inputs = ["input", "select", "button", "textarea"]; // detect if node is a text input element
+
+export default function isTextInput(element: HTMLElement): boolean {
+  return (
+    element &&
+    (inputs.indexOf(element.tagName.toLowerCase()) !== -1 ||
+      element.attributes.getNamedItem("role")?.value === "textbox" ||
+      element.attributes.getNamedItem("contenteditable")?.value === "true")
+  );
+}