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os: add os.devNull #38569

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os: add os.devNull #38569

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12 changes: 12 additions & 0 deletions doc/api/os.md
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Expand Up @@ -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
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7 changes: 7 additions & 0 deletions lib/os.js
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Expand Up @@ -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'
}
});
7 changes: 7 additions & 0 deletions test/parallel/test-os.js
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Expand Up @@ -259,3 +259,10 @@ 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');
}
Comment on lines +263 to +268
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@bl-ue bl-ue May 29, 2021 •
edited
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Any reason not to store os.devNull in a separate variable? I'm not getting it.

Suggested change
const devNull = os.devNull;
if (common.isWindows) {
assert.strictEqual(devNull, '\\\\.\\nul');
} else {
assert.strictEqual(devNull, '/dev/null');
}
if (common.isWindows) {
assert.strictEqual(os.devNull, '\\\\.\\nul');
} else {
assert.strictEqual(os.devNull, '/dev/null');
}

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Consistency with

node/test/parallel/test-os.js

Lines 186 to 191 in 1fc60ab

const EOL = os.EOL;
if (common.isWindows) {
assert.strictEqual(EOL, '\r\n');
} else {
assert.strictEqual(EOL, '\n');
}