如何在不创建对象的情况下调用 Joi 类的方法？

Question

I tried using the Joi NPM module, in the documentation it states that it is a class, but it is used without creating a class object like var joi = new Joi(); , how does this work?

I have a little knowledge of how a class works, it can be used by creating a class instance or by declaring the class static. Below is the code.

const Joi = require('@hapi/joi');
 function validation(args) {
    const schema = {
        "name": Joi.string().min(3).required()
    };
    return Joi.validate(args,schema);

 }
app.put('/api/courses/:id',(req,res)=>{
    const course = courses1.find(c => c.id === parseInt(req.params.id));
    if(!course){
       res.status(404).send('course not found...');
    }
    else{
        const {error} = validation(req.body);
        if(error){
            res.status(400).send(error.details[0].message);
        }
        else{
            course.name = req.body.name;
            res.status(200).send(courses1);
        }   
    }
});

Answer 1

// make new component validation.js

const Joi = require('@hapi/joi');


const signupValidation = (data) => {`enter code here`
    const schema = Joi.object({
        name: Joi.string().required(),
        email: Joi.string().required().email(),
       
        password: Joi.string().required(),
        role:Joi.string(),
    })
    return schema.validate(data)
}

module.exports.signupValidation = signupValidation ; 



//now you can import in your required component
import {signupValidation } from './validation'