.allowDecimals

Type: boolean

.defaultValue

Type: stringor booleanor number

.literals

.lowercase

Type: boolean

.maximum

Type: number

.minimum

Type: number

.name

Type: string

.required

Type: boolean

.type

Type: stringor subcommandor ...stringor booleanor durationor number

.missing(message:Message)

The function that runs if this argument is required and is missing.