Defining Custom Types in Sanctuary

00.js

const S = require('sanctuary')
const $ = require('sanctuary-def')

const x = 42
const s = "butter"

// this will work
const oops = x + s

// this will blow up
const result = S.add(x)(s)

01.js

const someUser = {
  id: 3,
  name: "Eric",
  email: "me@dokidoki.whatever"
}

const someProduct = {
  id: 123,
  name: "Exciting consumer item!"
}

const updateProductName = 
  (product, newName) => {
    return Object.assign(
      {}, 
      { ...product },
      { name: newName }
    )
}

// pass in user instead of product...
// ... aaaand it works. Kind of.

const newProduct = updateProductName(
  someUser,
  "Suggestive Refrigerator Magnet"
)

02.js

const $ = require('sanctuary-def')
const { create, env } = require('sanctuary')

const FirstType = $.NullaryType
  ('dokidoki-types/FirstType')
  ('http://dokidokidriven.com/types/FirstType')
  ((x) => x === "dokidoki")

const S = create({checkTypes: true, env: env.concat ([FirstType])})


const result = S.add(42)("dokidoki")