Example of Zod usage for the arcticle on dev.to

zod_example.ts

// link to the article:
// https://dev.to/andreik/zod-validatsiia-i-vyvod-tipov-na-osnovanii-skhiemy-dannykh-4n3l

import { z } from "https://deno.land/x/zod/mod.ts";

const Levels = ['J1', 'J2', 'J3', 'M1', 'M2', 'M3', 'S1', 'S2', 'S3'] as const;

const Skill = z.object({
  id: z.string().uuid(),
  name: z.string().min(1).max(60)
});

const PureEmployee = z.object({
  id: z.string().uuid(),
  name: 
    z.object({
      firstName: z.string().regex(/(([A-Z]{1}[a-z]{1,40})(\s[A-Z]{1}[a-z]{1,40})?)/),
      lastName: z.string().regex(/[A-Z]{1}[a-z]{1,40}/)
    })
    .transform( ({firstName, lastName}) => `${firstName} ${lastName}` ),      
  dob: z.date()
    .min(new Date('01-01-1950Z'))
    .min(new Date('31-12-2100Z'))
    .optional(),
  employmentDate: z.date()
    .min(new Date('01-01-2000Z'))
    .min(new Date('31-12-2100Z')),
  dismissalDate: z.date()
    .min(new Date('01-01-2000Z'))
    .min(new Date('31-12-2100Z'))
    .optional(),
  level: z.enum(Levels).optional(),
  skills: Skill
    .array()
    .min(1)
    .max(100)  
    .refine( s => (new Set(s.map( i => i.name ))).size === s.length, 'Duplicate skills are not allowed!')
    .optional()
});

const Employee = PureEmployee
  .refine( 
    obj => typeof(obj.dob) === 'undefined' || 
      (obj.employmentDate.getTime() - obj.dob.getTime()) > 16 * 365 * 24 * 60 * 60 * 1000,
      {
        message: 'Too young to work!'
      } 
    )
  .refine( 
    obj => typeof(obj.dismissalDate) === 'undefined' || 
      (obj.dismissalDate.getTime() >= obj.employmentDate.getTime()),
      {
        message: 'Dismissal date is before employment!'
      } 
    );

// this will parse successfully    

const employee = Employee.parse({
  id: 'eceffe7a-bbe6-41e9-bdc3-09b2970a0d8c',
  name: {
    firstName: 'James',
    lastName: 'Bond'
  },
  dob : new Date('01-01-1980Z'),
  employmentDate : new Date('01-01-2010Z'),
  dismissalDate : new Date('01-01-2011Z'),
  level: 'J1',
  skills: [
    { id: 'eceffe7a-bbe6-41e9-bdc3-09b2970a0d8c', name: 'abc' }
  ] 
});

console.log(employee);

// this will parse with errors

console.log(Employee.safeParse({
  id: 'eceffe7a-bbe6-41e9-bdc3-09b2970a0d8c',
  name: {
    firstName: 'James',
    lastName: 'Bond'
  },
  dob : new Date('01-01-1980Z'),
  employmentDate : new Date('01-01-2010Z'),
  dismissalDate : new Date('01-01-2011Z'),
  level: 'J1',
  skills: [
    { id: 'eceffe7a-bbe6-41e9-bdc3-09b2970a0d8c', name: 'abc' },
    { id: 'eceffe7a-bbe6-41e9-bdc3-09b2970a0d8c', name: 'abc' }
  ] 
}));

const PM = PureEmployee.extend({
  projectName: z.string()
});

// will not parse without project name specified

console.log(PM.safeParse({
  id: 'eceffe7a-bbe6-41e9-bdc3-09b2970a0d8c',
  name: {
    firstName: 'James',
    lastName: 'Bond'
  },
  dob : new Date('01-01-1980Z'),
  employmentDate : new Date('01-01-2010Z'),
  dismissalDate : new Date('01-01-2011Z'),
  level: 'J1',
  skills: [
    { id: 'eceffe7a-bbe6-41e9-bdc3-09b2970a0d8c', name: 'abc' }
  ]
}));

type Employee = z.infer<typeof Employee>;
type PM = z.infer<typeof PM>;

Link to the article:

https://dev.to/andreik/zod-validatsiia-i-vyvod-tipov-na-osnovanii-skhiemy-dannykh-4n3l