ProgramBuilder.optionalArg() method

Add an optional positional argument to the program.

Signature:

optionalArg<K extends string>(dest: K, options?: IPositionalArgumentMetadata): ExtendProgramBuilderWithOptional<T, K, string>;

Parameters

Parameter	Type	Description
dest	K	The destination key into which the argument value will be stored.
options	IPositionalArgumentMetadata	See IPositionalArgumentMetadata.

Returns:

ExtendProgramBuilderWithOptional<T, K, string>