perf: memoize filetree computation (#490)

Jacky Zhao

2023-09-20 48452231d5fcd14ef218928bde9ae7e5bc745f4a

 .github/workflows/ci.yaml

@@ -43,5 +43,5 @@
      - name: Test
        run: npm test

      - name: Ensure Quartz builds
        run: npx quartz build
      - name: Ensure Quartz builds, check bundle info
        run: npx quartz build --bundleInfo