refactor: enable strict type checking of fs patches src (#2510)

- Covered by existing test cases

Author: jbedard

.gitattributes

@@ -4,4 +4,5 @@ js/private/coverage/coverage.js linguist-generated=true
 js/private/devserver/js_run_devserver.mjs linguist-generated=true
 js/private/watch/aspect_watch_protocol.mjs linguist-generated=true
 js/private/watch/aspect_watch_protocol.d.mts linguist-generated=true
+js/private/node-patches/fs.cjs linguist-generated=true
 js/private/js_image_layer.mjs linguist-generated=true