Simple yeoman generator for recursive structure (sample excerpt)

yo-generator.js

const Generator = require('yeoman-generator');
const faker = require('faker');
const uuid = require('uuid');
const chalk = require('chalk');

const id = () => uuid.v4();

const rand = (min, max) => Math.ceil(Math.random() * (max - min)) + min;

const params = (type, max) => ({
    hasChildren: type !== 'teams',
    childrenType: type,
    nb: rand(1, max)
});

const typeTemplate = [
    {
        name: 'id',
        gen: id
    },
    {
        name: 'name',
        gen: faker.company.companyName
    }
];


const genObject = ({...o}, {name, gen}) => {
    o[name] = gen();
    return o;
};

const genItem = (kind, types) => {
    const f = (types, acc) => {
        if(types.length === 0) return acc;
        const [h, ...t] = types;
        return f(t, genObject(acc, h));
    };
    return f(types, {kind});
};

const genStructure = (recipe) => {
    const f = (result, currentRecipe, recipes) => {
        const {nb, hasChildren, childrenType} = currentRecipe;
        if(nb === 0) return result;
        
        const item = genItem(childrenType, typeTemplate);
        if(hasChildren) {
            const [c, ...t] = recipes;
            item[c.childrenType] = f([], c, t);
        }

        return f([...result, item], {...currentRecipe, nb: nb-1}, recipes);
    };
    const [head, ...tail] = recipe;
    return f([], head, tail);
};

module.exports = class extends Generator {
    constructor(args, opts) {
        super(args, opts);
        this.argument('type', {type: String, required: false});
        this.option('af', {type: Number, required: false});
        this.option('cms', { type: Number, required: false});
        this.argument('teams', {type: Number, required: false});
    }

    installingDeps() {
        //this.npmInstall(['faker', 'uuid', 'chalk'], { 'save-dev': true });
    }

    gen() {
        this.log(chalk.green('Starting generation...'));
        const type = this.options.type;
        const nbAf = this.options.af || 3;
        const nbCms = this.options.cms || 5;
        const nbTeams = this.options.teams || 7;
        const s = genStructure([params('af', nbAf), params('cms', nbCms), params('teams',nbTeams)]);
        this.log(`Handling type: ${type}, af: ${nbAf}, Cms: ${nbCms}, teams: ${nbTeams}`);
        this.log(JSON.stringify(s, null, 2));
    }
};

Sample use:

yo egeon:app structure --af 3 --cms 5 --teams 7