From 7d0f680aafb976927f44c2de375854baeafe21da Mon Sep 17 00:00:00 2001
From: James M Snell <jasnell@gmail.com>
Date: Mon, 1 Feb 2021 11:55:12 -0800
Subject: [PATCH] fs: use a default callback for fs.close()
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The `fs.close()` function requires a callback. Most often the only thing
that callback does is check and rethrow the error if one occurs. To
eliminate common boilerplate, make the callback optional with a default
that checks and rethrows the error as an uncaught exception.

Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/37174
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
---
 doc/api/fs.md | 8 +++++++-
 lib/fs.js     | 9 +++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/doc/api/fs.md b/doc/api/fs.md
index acee67c11ea350..13a51cdc8add33 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -1618,10 +1618,13 @@ This is the synchronous version of [`fs.chown()`][].
 
 See also: chown(2).
 
-## `fs.close(fd, callback)`
+## `fs.close(fd[, callback])`
 <!-- YAML
 added: v0.0.2
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/37174
+    description: A default callback is now used if one is not provided.
   - version: v10.0.0
     pr-url: https://github.com/nodejs/node/pull/12562
     description: The `callback` parameter is no longer optional. Not passing
@@ -1642,6 +1645,9 @@ to the completion callback.
 Calling `fs.close()` on any file descriptor (`fd`) that is currently in use
 through any other `fs` operation may lead to undefined behavior.
 
+If the `callback` argument is omitted, a default callback function that rethrows
+any error as an uncaught exception will be used.
+
 ## `fs.closeSync(fd)`
 <!-- YAML
 added: v0.1.21
diff --git a/lib/fs.js b/lib/fs.js
index 368ddfae188fa7..d1280d20718569 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -438,9 +438,14 @@ function readFileSync(path, options) {
   return buffer;
 }
 
-function close(fd, callback) {
+function defaultCloseCallback(err) {
+  if (err != null) throw err;
+}
+
+function close(fd, callback = defaultCloseCallback) {
   validateInt32(fd, 'fd', 0);
-  callback = makeCallback(callback);
+  if (callback !== defaultCloseCallback)
+    callback = makeCallback(callback);
 
   const req = new FSReqCallback();
   req.oncomplete = callback;