chore: use `FsFile[Symbol.dispose]()` (#22007)

This change takes advantage of explicit resources management for
`FsFile` instances and tweaks documentation to encourage the use of it.

---------

Signed-off-by: Asher Gomez <ashersaupingomez@gmail.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/cli/tests/unit/serve_test.ts b/cli/tests/unit/serve_test.ts
index 9226a9bd2..e188932ac 100644
--- a/cli/tests/unit/serve_test.ts
+++ b/cli/tests/unit/serve_test.ts
@@ -2567,10 +2567,9 @@ function makeTempData(size: number) {
 
 async function makeTempFile(size: number) {
   const tmpFile = await Deno.makeTempFile();
-  const file = await Deno.open(tmpFile, { write: true, read: true });
+  using file = await Deno.open(tmpFile, { write: true, read: true });
   const data = makeTempData(size);
   await file.write(data);
-  file.close();
 
   return await Deno.open(tmpFile, { write: true, read: true });
 }