istanbuljs / nyc / 2021 / 3

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fix(cli): Report error if unwanted positional arguments are received (#1100)

This applies to check-coverage, instrument, merge and report.  Passing
additional arguments will now cause the help script to be displayed and
an error exit code.

Unknown flags `nyc report --unknown=1` are still not reported.
Reporting unknown flags would require additional work as
`yargs.strict()` causes unknown items from configuration to be reported,
including flags that are defined for the global command but not a
sub-command.

Fixes #401

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