os: add os.devNull

Provides the platform-specific file path of the null device. PR-URL: #38569 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Darshan Sen <[email protected]> Reviewed-By: Tobias Nießen <[email protected]>
nodejs · Jun 2, 2021 · e119531 · e119531
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diff --git a/doc/api/os.md b/doc/api/os.md
@@ -122,6 +122,18 @@ The properties included on each object include:
 `nice` values are POSIX-only. On Windows, the `nice` values of all processors
 are always 0.
 
+## `os.devNull`
+<!-- YAML
+added: REPLACEME
+-->
+
+* {string}
+
+The platform-specific file path of the null device.
+
+* `\\.\nul` on Windows
+* `/dev/null` on POSIX
+
 ## `os.endianness()`
 <!-- YAML
 added: v0.9.4

diff --git a/lib/os.js b/lib/os.js
@@ -382,5 +382,12 @@ ObjectDefineProperties(module.exports, {
     enumerable: true,
     writable: false,
     value: isWindows ? '\r\n' : '\n'
+  },
+
+  devNull: {
+    configurable: true,
+    enumerable: true,
+    writable: false,
+    value: isWindows ? '\\\\.\\nul' : '/dev/null'
   }
 });
diff --git a/test/parallel/test-os.js b/test/parallel/test-os.js
@@ -257,3 +257,10 @@ if (!common.isIBMi) {
 
 is.number(+os.freemem, 'freemem');
 is.number(os.freemem(), 'freemem');
+
+const devNull = os.devNull;
+if (common.isWindows) {
+  assert.strictEqual(devNull, '\\\\.\\nul');
+} else {
+  assert.strictEqual(devNull, '/dev/null');
+}