zod 4.4.3

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:npm/zod@4.4.3
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/zod@4.4.3
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:134fd7937f45d808e47c8fdce7b1df720b9104519ac4bac6cd0103b78dd945d3","constraints":{"executionContext":"node"},"contract":["z.string() and z.number() validate primitive values and reject invalid types","z.object() validates structured objects and applies default values for missing optional fields","z.discriminatedUnion() dispatches validation based on discriminator tag and validates matching member schema","z.string().pipe() executes schema transformation pipelines and validates refined output","z.coerce converts string representations into primitive numbers and booleans","safeParse() returns structured error issues and field-level error mapping upon validation failure"],"goal":"verify pkg:npm/zod@4.4.3","kind":"HOW","packages":["pkg:npm/zod@4.4.3"],"schemaVersion":1},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/zod@4.4.3"],"schemaVersion":1,"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-zod",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-zod",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "zod": "4.4.3"
      }
    },
    "node_modules/zod": {
      "version": "4.4.3",
      "resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
      "integrity": "sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==",
      "license": "MIT",
      "funding": {
        "url": "https://github.com/sponsors/colinhacks"
      }
    }
  }
}

{
  "name": "sample-zod",
  "version": "1.0.0",
  "private": true,
  "description": "Clean-room verification sample for zod",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "zod": "4.4.3"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/zod@4.4.3",
  "kind": "HOW",
  "packages": [
    "pkg:npm/zod@4.4.3"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}

const { z } = require('zod');

const userSchema = z.object({
  id: z.number().int().positive(),
  username: z.string().min(2),
  role: z.enum(['admin', 'member', 'guest']).default('guest'),
  active: z.boolean().optional()
});

function parseUser(input) {
  return userSchema.parse(input);
}

function safeParseUser(input) {
  return userSchema.safeParse(input);
}

module.exports = {
  userSchema,
  parseUser,
  safeParseUser
};

const assert = require('node:assert/strict');
const { z } = require('zod');
const { parseUser, safeParseUser } = require('../src/index.js');

// 1. z.string() and z.number() validate primitive values and reject invalid types
const strSchema = z.string().min(2).max(10);
assert.equal(strSchema.parse('hello'), 'hello');
assert.equal(strSchema.safeParse('x').success, false);
assert.equal(strSchema.safeParse(123).success, false);

const numSchema = z.number().int().positive();
assert.equal(numSchema.parse(42), 42);
assert.equal(numSchema.safeParse(-5).success, false);
assert.equal(numSchema.safeParse(3.14).success, false);

// 2. z.object() validates structured objects and applies default values for missing optional fields
const parsed = parseUser({ id: 1, username: 'testuser' });
assert.deepEqual(parsed, { id: 1, username: 'testuser', role: 'guest' });

const parsedExplicit = parseUser({ id: 2, username: 'adminuser', role: 'admin', active: true });
assert.deepEqual(parsedExplicit, { id: 2, username: 'adminuser', role: 'admin', active: true });

// 3. z.discriminatedUnion() dispatches validation based on discriminator tag and validates matching member schema
const eventSchema = z.discriminatedUnion('type', [
  z.object({ type: z.literal('click'), x: z.number(), y: z.number() }),
  z.object({ type: z.literal('keypress'), key: z.string() })
]);
assert.deepEqual(eventSchema.parse({ type: 'click', x: 10, y: 20 }), { type: 'click', x: 10, y: 20 });
assert.deepEqual(eventSchema.parse({ type: 'keypress', key: 'Enter' }), { type: 'keypress', key: 'Enter' });
assert.equal(eventSchema.safeParse({ type: 'unknown' }).success, false);
assert.equal(eventSchema.safeParse({ x: 10, y: 20 }).success, false);

// 4. z.string().pipe() executes schema transformation pipelines and validates refined output
const normalizedEmail = z.string().trim().toLowerCase().pipe(z.string().email());
assert.equal(normalizedEmail.parse('  User@Example.Com  '), 'user@example.com');
assert.equal(normalizedEmail.safeParse('not-an-email').success, false);

// 5. z.coerce converts string representations into primitive numbers and booleans
const configSchema = z.object({
  port: z.coerce.number(),
  debug: z.coerce.boolean()
});
const parsedConfig = configSchema.parse({ port: '8080', debug: '1' });
assert.equal(parsedConfig.port, 8080);
assert.equal(parsedConfig.debug, true);

// 6. safeParse() returns structured error issues and field-level error mapping upon validation failure
const failure = safeParseUser({ id: -1, username: 'x' });
assert.equal(failure.success, false);
if (!failure.success) {
  const flattened = failure.error.flatten();
  assert.ok(flattened.fieldErrors.id);
  assert.ok(flattened.fieldErrors.username);
  assert.ok(failure.error.issues.length >= 2);
}

console.log('Contract tests passed successfully.');