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defineFlag({
 name: 'longName',  // '--longName',
 alias: 'l', // '-l' ,
 description: 'a description of flag', // used for help text
 default: false, // default value passed to action when this flag is not passed
 required: true, // is flag required to be passed, if flag not used exit cli
 validate(value){
   // if flag is passed call the validate function if returns false exit cli, if true carry on to action.
 }
})