buffer: add pending deprecation warning

The pending deprecation warning is off by default.
Launch the node process with --pending-deprecation
or NODE_PENDING_DEPRECATION=1 env var set.

PR-URL: https://github.com/nodejs/node/pull/11968
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/test/parallel/test-buffer-nopendingdep-map.js b/test/parallel/test-buffer-nopendingdep-map.js
new file mode 100644
index 0000000000..90a24a625b
--- /dev/null
+++ b/test/parallel/test-buffer-nopendingdep-map.js
@@ -0,0 +1,14 @@
+// Flags: --no-warnings --pending-deprecation
+'use strict';
+
+const common = require('../common');
+const Buffer = require('buffer').Buffer;
+
+process.on('warning', common.mustNotCall('A warning should not be emitted'));
+
+// With the --pending-deprecation flag, the deprecation warning for
+// new Buffer() should not be emitted when Uint8Array methods are called.
+
+Buffer.from('abc').map((i) => i);
+Buffer.from('abc').filter((i) => i);
+Buffer.from('abc').slice(1, 2);