Also move our memory default to the beginning of NODE_OPTIONS so it can
be overidden. The version of the flag with dashes seems to be the more
correct one now so use that instead of underscores.
Related: #2113.
I think having them combined and relying on if statements was getting
confusing especially if we want to add additional messages with
different payloads (which will soon be the case).
- Immediately create ipcMain so it doesn't have to be a function which I
think feels cleaner.
- Move exit handling to a separate function to compensate (otherwise
the VS Code CLI for example won't be able to exit on its own).
- New isChild prop that is clearer than checking for parentPid (IMO).
- Skip all the checks that aren't necessary for the child process (like
--help, --version, etc).
- Since we check if we're the child in entry go ahead and move the
wrap code into entry as well since that's basically what it does.
- Use a single catch at the end of the entry.
- Split out the VS Code CLI and existing instance code into separate
functions.
