If you're using WebStorm 2024.2+ without JetBrains Toolbox, it won't install command-line launcher automatically.
Though, there's a menu "Tools > Create Command-line Launcher" that won't do anything useful, except showing you a link on how to do that,
but it's bugged for now.

MacOS setup

1. Create a file under the following location: "/usr/local/bin/webstorm"
2. chmod +x /usr/local/bin/webstorm
3. File contents:

#!/bin/sh

open -na "WebStorm.app" --args "$@" > /dev/null 2>&1 &

This would allow you to open any project in command-line, and type webstorm ., to open WebStorm in a current directory, without any errors.