.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.