fix getRemainingFlags for arguments with multiple '--' in them

[sezanzeb]

PR Checklist

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PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

nest start --exec "node --experimental-specifier-resolution=node --no-warnings" --debug fails with TypeError: Cannot read properties of undefined (reading 'toUpperCase'), because the camelCase function gets "de experimental-specifier-resolution=node --no-warnings" as input. splitting -- will result in an empty string, and ''[0] is undefined.

What is the new behavior?

It doesn't break.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Alternatives might be to skip all item values that don't start with '--' or that contain spaces or something. But I figured changing it to /--/g is the smallest change and has the least chance of breaking stuff that I'm not aware of.

To avoid this error, either remove --no-warnings or move --exec ... to the end.

Doesn't affect version 9.1.3, affects 9.5.0

[kamilmysliwiec]

LGTM