os: make EOL configurable and read only

PR-URL: https://github.com/nodejs/node/pull/14622
Fixes: https://github.com/nodejs/node/issues/14619
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/test/parallel/test-os-eol.js b/test/parallel/test-os-eol.js
new file mode 100644
index 0000000000..7a7a300717
--- /dev/null
+++ b/test/parallel/test-os-eol.js
@@ -0,0 +1,27 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const os = require('os');
+
+const eol = common.isWindows ? '\r\n' : '\n';
+
+assert.strictEqual(os.EOL, eol);
+
+common.expectsError(function() {
+  os.EOL = 123;
+}, {
+  type: TypeError,
+  message: /^Cannot assign to read only property 'EOL' of object '#<Object>'$/
+});
+
+const foo = 'foo';
+Object.defineProperties(os, {
+  EOL: {
+    configurable: true,
+    enumerable: true,
+    writable: false,
+    value: foo
+  }
+});
+assert.strictEqual(os.EOL, foo);