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cluster?: stringThe letters used for clustering in short-option style (e.g., 'fF').
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default?: KnownValue | DefaultValueCallbackTe default value or a callback that returns the default value.
The default value is set at the end of the parsing loop if the option was specified neither on the command-line nor as an environment variable. You may use a callback to inspect parsed values and determine the default value based on those values.
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parse?: ParsingCallback<P>A custom callback for parsing the option parameter(s).
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required?: trueTrue if the option is always required.
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requiredIf?: RequiresThe conditional requirements.
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requires?: RequiresThe forward requirements.
Defines attributes common to options that have values.