confirm1.js

prompting: function () {
  // Have Yeoman greet the user.
  // Would love to skip this if this generator is called from another generator.
  this.log(yosay(
    'Welcome to the <%- superb %> ' + chalk.red('<%= generatorName %>') + ' generator!'
  ));

  var prompts = [{
    type: 'confirm',
    name: 'someAnswer',
    message: 'Would you like to enable this option?',
    default: true
  }];

  // Have to do this promise handling every time 
  // to store the answers into this.props
  return this.prompt(prompts).then(function (props) {
    // To access props later use this.props.someAnswer;
    this.props = props;
  }.bind(this));
},
writing: {
  if(this.props.someAnswer){
    ...
  }
}

confirm2-easily.js

prompting: function () {
  // Will skip this if options.skipGreeting is true
  this.easily.greet(
    'Welcome to the <%- superb %> ' + chalk.red('<%= generatorName %>') + ' generator!'
  );

  return this.easily
    .confirmBeforeStart('Would you like to enable this option?')
    .prompt();
},
writing: {
  if(this.easily.checkForConfirmation()){
    ...
  }
}