4

index.js

const Generator = require('yeoman-generator');
// => We include InputValidate
const { List, Input, InputValidate } = require('@webpack-cli/webpack-scaffold');

module.exports = class WebpackGenerator extends Generator {
  /* ... */
  prompting() {
    // => We create a validator function that takes the user input as parameter
    const validateName = (value) => {
      // => If it contains space it's not a valid name
      if (value.indexOf(' ') > 0) {
        // => We return a message for the user
        return 'Invalid name: spaces are not allowed, try again';
      } else {
        // => Otherwise, it's valid, we can continua
        return true;
      }
    }
    return this.prompt([
      // => We replace Input with InputValidate
      // => and we pass the validator function as third parameter => => =>
      InputValidate('name', 'How do you want to name your project? (my-vue-project)', validateName),
      Input('inFolder', 'Which folder will your source code be in? (src)'),
      /* ... */
    ])
  }
}