cli: normalize `_` → `-` when parsing options

This allows for option syntax similar to V8’s one, e.g.
`--no_warnings` has the same effect as `--no-warnings`.

PR-URL: https://github.com/nodejs/node/pull/23020
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/test/parallel/test-pending-deprecation.js b/test/parallel/test-pending-deprecation.js
index f8b4ec8e5b..bb11d84bcc 100644
--- a/test/parallel/test-pending-deprecation.js
+++ b/test/parallel/test-pending-deprecation.js
@@ -36,6 +36,14 @@ switch (process.argv[2]) {
       assert.strictEqual(code, 0, message('--pending-deprecation'));
     }));
 
+    // Test the --pending_deprecation command line switch.
+    fork(__filename, ['switch'], {
+      execArgv: ['--pending_deprecation'],
+      silent: true
+    }).on('exit', common.mustCall((code) => {
+      assert.strictEqual(code, 0, message('--pending_deprecation'));
+    }));
+
     // Test the NODE_PENDING_DEPRECATION environment var.
     fork(__filename, ['env'], {
       env: Object.assign({}, process.env, { NODE_PENDING_DEPRECATION: 1 }),