gistfile1.js

"use strict"

const Joi = require("joi")
const my_class_schema = require("./schema")

class Interface {
  constructor() {
    // Get the members on this class.
    const class_funcs = Object.getOwnPropertyNames(Object.getPrototypeOf(this))
    const class_as_object = {}

    // Create an object from those methods so we can validate their arity.
    class_funcs.forEach(func => class_as_object[func] = this[func])
    
    my_class_schema.validate(class_funcs)
    
    if (validation.error) {
      return Promise.reject(validation.error)
    }
  }
}