fs: support Uint8Array input to methods

Allow `fs.read`, `fs.write` and `fs.writeFile` to take
`Uint8Array` arguments.

PR-URL: https://github.com/nodejs/node/pull/10382
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Italo A. Casas <me@italoacasas.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/test/parallel/test-fs-write-buffer.js b/test/parallel/test-fs-write-buffer.js
index ed77d697b3..0e24f33872 100644
--- a/test/parallel/test-fs-write-buffer.js
+++ b/test/parallel/test-fs-write-buffer.js
@@ -106,3 +106,23 @@ common.refreshTmpDir();
     fs.write(fd, expected, undefined, undefined, cb);
   }));
 }
+
+// fs.write with a Uint8Array, without the offset and length parameters:
+{
+  const filename = path.join(common.tmpDir, 'write6.txt');
+  fs.open(filename, 'w', 0o644, common.mustCall(function(err, fd) {
+    assert.ifError(err);
+
+    const cb = common.mustCall(function(err, written) {
+      assert.ifError(err);
+
+      assert.strictEqual(expected.length, written);
+      fs.closeSync(fd);
+
+      const found = fs.readFileSync(filename, 'utf8');
+      assert.deepStrictEqual(expected.toString(), found);
+    });
+
+    fs.write(fd, Uint8Array.from(expected), cb);
+  }));
+}