watch: NODE_OPTIONS filter misses underscore aliases like --watch_path, causing recursive spawning #66364

Version

main

Platform

All

Subsystem

watch

What steps will reproduce the bug?

printf 'console.log("APP-EXECUTED");\n' > app.js

NODE_OPTIONS='--watch_path=./' node app.js

How often does it reproduce? Is there a required condition?

Always

What is the expected behavior? Why is that the expected behavior?

The child spawned by watch mode should have the watch flags stripped from NODE_OPTIONS, exactly as the dash spelling is. --watch-path=./ prints APP-EXECUTED then Completed running 'app.js'. Waiting for file changes... and settles at one process.

The C++ layer treats _ and - as equivalent in option names, so the two spellings must not differ in behavior.

What do you see instead?

No output at all; the application never executes. Each descendant re-enters watch mode and spawns another

Additional information

No response