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/components/LoadingIndicator/LoadingIndicatorBar.tsx

@@ -0,0 +1,33 @@
+import * as React from "react";
+import styled, { keyframes } from "styled-components";
+
+const LoadingIndicatorBar = () => {
+  return (
+    <Container>
+      <Loader />
+    </Container>
+  );
+};
+
+const loadingFrame = keyframes`
+  from { margin-left: -100%; }
+  to { margin-left: 100%; }
+`;
+
+const Container = styled.div`
+  position: fixed;
+  top: 0;
+  z-index: ${(props) => props.theme.depths.loadingIndicatorBar};
+  width: 100%;
+  animation: ${loadingFrame} 4s ease-in-out infinite;
+  animation-delay: 250ms;
+  margin-left: -100%;
+`;
+
+const Loader = styled.div`
+  width: 100%;
+  height: 2px;
+  background-color: ${(props) => props.theme.primary};
+`;
+
+export default LoadingIndicatorBar;