feat: add file view (#1064)

app/assets/javascripts/Components/FilePreview/CreateObjectURLWithRef.tsx

@@ -0,0 +1,18 @@
+import { FileItem } from '@standardnotes/snjs'
+import { MutableRefObject } from 'react'
+
+export const createObjectURLWithRef = (
+  type: FileItem['mimeType'],
+  bytes: Uint8Array,
+  ref: MutableRefObject<string | undefined>,
+) => {
+  const objectURL = URL.createObjectURL(
+    new Blob([bytes], {
+      type,
+    }),
+  )
+
+  ref.current = objectURL
+
+  return objectURL
+}