perf: memoize filetree computation (#490)

Jacky Zhao

2023-09-20 48452231d5fcd14ef218928bde9ae7e5bc745f4a

 .prettierrc

@@ -2,5 +2,6 @@
  "printWidth": 100,
  "quoteProps": "as-needed",
  "trailingComma": "all",
  "tabWidth": 2
  "tabWidth": 2,
  "semi": false
}