feat(node_compat): Add a close method to the FileHandle class. (#19357)

## WHY 

ref: https://github.com/denoland/deno/issues/19165

The FileHandle class has many missing methods compared to node.
Add these.

## WHAT

- Add close method

---------

Co-authored-by: Matt Mastracci <matthew@mastracci.com>

2 files changed, 6 insertions, 1 deletions

diff --git a/cli/tests/unit_node/_fs/_fs_handle_test.ts b/cli/tests/unit_node/_fs/_fs_handle_test.ts
index c1e5ef871..165608e1c 100644
--- a/cli/tests/unit_node/_fs/_fs_handle_test.ts
+++ b/cli/tests/unit_node/_fs/_fs_handle_test.ts
@@ -16,5 +16,5 @@ Deno.test("readFileSuccess", async function () {
   assert(data instanceof Uint8Array);
   assertEquals(new TextDecoder().decode(data as Uint8Array), "hello world");
 
-  Deno.close(fileHandle.fd);
+  await fileHandle.close();
 });
diff --git a/ext/node/polyfills/internal/fs/handle.ts b/ext/node/polyfills/internal/fs/handle.ts
index a369a4a4d..a1ee263ea 100644
--- a/ext/node/polyfills/internal/fs/handle.ts
+++ b/ext/node/polyfills/internal/fs/handle.ts
@@ -24,6 +24,11 @@ export class FileHandle extends EventEmitter {
   ): Promise<string | Buffer> {
     return promises.readFile(this, opt);
   }
+
+  close(): Promise<void> {
+    // Note that Deno.close is not async
+    return Promise.resolve(Deno.close(this.fd));
+  }
 }
 
 export default {