doc: add callback function signatures in fs.md

PR-URL: #13424
Refs: #11135
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

doc/api/fs.md

@@ -448,6 +448,7 @@ changes:
 * `path` {string|Buffer|URL}
 * `mode` {integer} **Default:** `fs.constants.F_OK`
 * `callback` {Function}
+ * `err` {Error}
 
 Tests a user's permissions for the file or directory specified by `path`.
 The `mode` argument is an optional integer that specifies the accessibility
@@ -600,6 +601,7 @@ changes:
  * `mode` {integer} **Default:** `0o666`
  * `flag` {string} **Default:** `'a'`
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronously append data to a file, creating the file if it does not yet exist.
 `data` can be a string or a buffer.
@@ -662,6 +664,7 @@ changes:
 * `path` {string|Buffer|URL}
 * `mode` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous chmod(2). No arguments other than a possible exception are given
 to the completion callback.
@@ -699,6 +702,7 @@ changes:
 * `uid` {integer}
 * `gid` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous chown(2). No arguments other than a possible exception are given
 to the completion callback.
@@ -731,6 +735,7 @@ changes:
 
 * `fd` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous close(2). No arguments other than a possible exception are given
 to the completion callback.
@@ -980,6 +985,7 @@ deprecated: v1.0.0
 
 * `path` {string|Buffer|URL}
 * `callback` {Function}
+ * `exists` {Boolean}
 
 Test whether or not the given path exists by checking with the file system.
 Then call the `callback` argument with either true or false. Example:
@@ -1108,6 +1114,7 @@ changes:
 * `fd` {integer}
 * `mode` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous fchmod(2). No arguments other than a possible exception
 are given to the completion callback.
@@ -1136,6 +1143,7 @@ changes:
 * `uid` {integer}
 * `gid` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous fchown(2). No arguments other than a possible exception are given
 to the completion callback.
@@ -1163,6 +1171,7 @@ changes:
 
 * `fd` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous fdatasync(2). No arguments other than a possible exception are
 given to the completion callback.
@@ -1188,6 +1197,8 @@ changes:
 
 * `fd` {integer}
 * `callback` {Function}
+ * `err` {Error}
+ * `stats` {fs.Stats}
 
 Asynchronous fstat(2). The callback gets two arguments `(err, stats)` where
 `stats` is an [`fs.Stats`][] object. `fstat()` is identical to [`stat()`][],
@@ -1214,6 +1225,7 @@ changes:
 
 * `fd` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous fsync(2). No arguments other than a possible exception are given
 to the completion callback.
@@ -1240,6 +1252,7 @@ changes:
 * `fd` {integer}
 * `len` {integer} **Default:** `0`
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous ftruncate(2). No arguments other than a possible exception are
 given to the completion callback.
@@ -1313,6 +1326,7 @@ changes:
 * `atime` {integer}
 * `mtime` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Change the file timestamps of a file referenced by the supplied file
 descriptor.
@@ -1349,6 +1363,7 @@ changes:
 * `path` {string|Buffer}
 * `mode` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous lchmod(2). No arguments other than a possible exception
 are given to the completion callback.
@@ -1379,6 +1394,7 @@ changes:
 * `uid` {integer}
 * `gid` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous lchown(2). No arguments other than a possible exception are given
 to the completion callback.
@@ -1412,6 +1428,7 @@ changes:
 * `existingPath` {string|Buffer|URL}
 * `newPath` {string|Buffer|URL}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous link(2). No arguments other than a possible exception are given to
 the completion callback.
@@ -1448,6 +1465,8 @@ changes:
 
 * `path` {string|Buffer|URL}
 * `callback` {Function}
+ * `err` {Error}
+ * `stats` {fs.Stats}
 
 Asynchronous lstat(2). The callback gets two arguments `(err, stats)` where
 `stats` is a [`fs.Stats`][] object. `lstat()` is identical to `stat()`,
@@ -1485,6 +1504,7 @@ changes:
 * `path` {string|Buffer|URL}
 * `mode` {integer} **Default:** `0o777`
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous mkdir(2). No arguments other than a possible exception are given
 to the completion callback. `mode` defaults to `0o777`.
@@ -1521,6 +1541,8 @@ changes:
 * `options` {string|Object}
  * `encoding` {string} **Default:** `'utf8'`
 * `callback` {Function}
+ * `err` {Error}
+ * `folder` {string}
 
 Creates a unique temporary directory.
 
@@ -1603,6 +1625,8 @@ changes:
 * `flags` {string|number}
 * `mode` {integer} **Default:** `0o666`
 * `callback` {Function}
+ * `err` {Error}
+ * `fd` {integer}
 
 Asynchronous file open. See open(2). `flags` can be:
 
@@ -1721,6 +1745,9 @@ changes:
 * `length` {integer}
 * `position` {integer}
 * `callback` {Function}
+ * `err` {Error}
+ * `bytesRead` {integer}
+ * `buffer` {Buffer}
 
 Read data from the file specified by `fd`.
 
@@ -1761,6 +1788,8 @@ changes:
 * `options` {string|Object}
  * `encoding` {string} **Default:** `'utf8'`
 * `callback` {Function}
+ * `err` {Error}
+ * `files` {string[]|Buffer[]}
 
 Asynchronous readdir(3). Reads the contents of a directory.
 The callback gets two arguments `(err, files)` where `files` is an array of
@@ -1819,6 +1848,8 @@ changes:
  * `encoding` {string|null} **Default:** `null`
  * `flag` {string} **Default:** `'r'`
 * `callback` {Function}
+ * `err` {Error}
+ * `data` {string|Buffer}
 
 Asynchronously reads the entire contents of a file. Example:
 
@@ -1914,6 +1945,8 @@ changes:
 * `options` {string|Object}
  * `encoding` {string} **Default:** `'utf8'`
 * `callback` {Function}
+ * `err` {Error}
+ * `linkString` {string|Buffer}
 
 Asynchronous readlink(2). The callback gets two arguments `(err,
 linkString)`.
@@ -1989,6 +2022,8 @@ changes:
 * `options` {string|Object}
  * `encoding` {string} **Default:** `'utf8'`
 * `callback` {Function}
+ * `err` {Error}
+ * `resolvedPath` {string|Buffer}
 
 Asynchronous realpath(3). The `callback` gets two arguments `(err,
 resolvedPath)`. May use `process.cwd` to resolve relative paths.
@@ -2057,6 +2092,7 @@ changes:
 * `oldPath` {string|Buffer|URL}
 * `newPath` {string|Buffer|URL}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous rename(2). No arguments other than a possible exception are given
 to the completion callback.
@@ -2093,6 +2129,7 @@ changes:
 
 * `path` {string|Buffer|URL}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous rmdir(2). No arguments other than a possible exception are given
 to the completion callback.
@@ -2133,6 +2170,8 @@ changes:
 
 * `path` {string|Buffer|URL}
 * `callback` {Function}
+ * `err` {Error}
+ * `stats` {fs.Stats}
 
 Asynchronous stat(2). The callback gets two arguments `(err, stats)` where
 `stats` is an [`fs.Stats`][] object.
@@ -2176,6 +2215,7 @@ changes:
 * `path` {string|Buffer|URL}
 * `type` {string} **Default:** `'file'`
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous symlink(2). No arguments other than a possible exception are given
 to the completion callback. The `type` argument can be set to `'dir'`,
@@ -2222,6 +2262,7 @@ changes:
 * `path` {string|Buffer}
 * `len` {integer} **Default:** `0`
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous truncate(2). No arguments other than a possible exception are
 given to the completion callback. A file descriptor can also be passed as the
@@ -2254,6 +2295,7 @@ changes:
 
 * `path` {string|Buffer|URL}
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronous unlink(2). No arguments other than a possible exception are given
 to the completion callback.
@@ -2279,6 +2321,8 @@ added: v0.1.31
 
 * `filename` {string|Buffer}
 * `listener` {Function|undefined} **Default:** `undefined`
+ * `eventType` {string}
+ * `filename` {string|Buffer}
 
 Stop watching for changes on `filename`. If `listener` is specified, only that
 particular listener is removed. Otherwise, *all* listeners are removed,
@@ -2313,6 +2357,7 @@ changes:
 * `atime` {integer}
 * `mtime` {integer}
 * `callback` {Function}
+ * `err` {Error}
 
 Change file timestamps of the file referenced by the supplied path.
 
@@ -2369,6 +2414,8 @@ changes:
  * `encoding` {string} Specifies the character encoding to be used for the
  filename passed to the listener. **Default:** `'utf8'`
 * `listener` {Function|undefined} **Default:** `undefined`
+ * `eventType` {string}
+ * `filename` {string|Buffer}
 
 Watch for changes on `filename`, where `filename` is either a file or a
 directory. The returned object is a [`fs.FSWatcher`][].
@@ -2471,6 +2518,8 @@ changes:
  * `persistent` {boolean} **Default:** `true`
  * `interval` {integer} **Default:** `5007`
 * `listener` {Function}
+ * `current` {fs.Stats}
+ * `previous` {fs.Stats}
 
 Watch for changes on `filename`. The callback `listener` will be called each
 time the file is accessed.
@@ -2530,6 +2579,9 @@ changes:
 * `length` {integer}
 * `position` {integer}
 * `callback` {Function}
+ * `err` {Error}
+ * `bytesWritten` {integer}
+ * `buffer` {Buffer|Uint8Array}
 
 Write `buffer` to the file specified by `fd`.
 
@@ -2572,6 +2624,9 @@ changes:
 * `position` {integer}
 * `encoding` {string}
 * `callback` {Function}
+ * `err` {Error}
+ * `written` {integer}
+ * `string` {string}
 
 Write `string` to the file specified by `fd`. If `string` is not a string, then
 the value will be coerced to one.
@@ -2621,6 +2676,7 @@ changes:
  * `mode` {integer} **Default:** `0o666`
  * `flag` {string} **Default:** `'w'`
 * `callback` {Function}
+ * `err` {Error}
 
 Asynchronously writes data to a file, replacing the file if it already exists.
 `data` can be a string or a buffer.