npm-user-validate 3.0.0: email, pw, requirements

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/npm-user-validate@3.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/npm-user-validate@3.0.0

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:d0295397e9b0ba82717f17a5226bf930402254d944689ad62bb224f7915fd371","contract":["validate.username('valid-account_01') === null","validate.email('contact@example.com') === null","validate.pw('sample-secret-value') === null","validate.username('InvalidCase') returns Error matching requirements.username.lowerCase","validate.username('bad space') returns Error matching requirements.username.urlSafe","validate.username('.leadingdot') returns Error matching requirements.username.dot","validate.username(215 chars) returns Error matching requirements.username.length","validate.username(\"bad'quote\") returns Error matching requirements.username.illegal","validate.email('not-an-address') returns Error matching requirements.email.valid","validate.email(\u003e254 chars) returns Error matching requirements.email.length"],"goal":"verify pkg:npm/npm-user-validate@3.0.0","kind":"HOW","packages":["pkg:npm/npm-user-validate@3.0.0"],"schemaVersion":1,"symbols":["email","pw","requirements","username"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/npm-user-validate@3.0.0"],"schemaVersion":1,"subject":"pkg:npm/npm-user-validate@3.0.0","symbols":["email","pw","requirements","username"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "npm-user-validate": "3.0.0"
      }
    },
    "node_modules/npm-user-validate": {
      "version": "3.0.0",
      "resolved": "https://registry.npmjs.org/npm-user-validate/-/npm-user-validate-3.0.0.tgz",
      "integrity": "sha512-9xi0RdSmJ4mPYTC393VJPz1Sp8LyCx9cUnm/L9Qcb3cFO8gjT4mN20P9FAsea8qDHdQ7LtcN8VLh2UT47SdKCw==",
      "license": "BSD-2-Clause",
      "engines": {
        "node": "^18.17.0 || >=20.5.0"
      }
    }
  }
}

{
  "name": "sample",
  "version": "1.0.0",
  "private": true,
  "license": "MIT-0",
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "npm-user-validate": "3.0.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/npm-user-validate@3.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/npm-user-validate@3.0.0"
  ]
}

import assert from "node:assert/strict";
import validate from "npm-user-validate";

// 1. Validate valid inputs return null
assert.equal(validate.username("valid-account_01"), null);
assert.equal(validate.email("contact@example.com"), null);
assert.equal(validate.pw("sample-secret-value"), null);

// 2. Validate username error conditions
const upperErr = validate.username("InvalidCase");
assert.ok(upperErr instanceof Error);
assert.equal(upperErr.message, validate.requirements.username.lowerCase);

const urlUnsafeErr = validate.username("bad space");
assert.ok(urlUnsafeErr instanceof Error);
assert.equal(urlUnsafeErr.message, validate.requirements.username.urlSafe);

const dotErr = validate.username(".leadingdot");
assert.ok(dotErr instanceof Error);
assert.equal(dotErr.message, validate.requirements.username.dot);

const lenErr = validate.username("a".repeat(215));
assert.ok(lenErr instanceof Error);
assert.equal(lenErr.message, validate.requirements.username.length);

const quoteErr = validate.username("bad'quote");
assert.ok(quoteErr instanceof Error);
assert.equal(quoteErr.message, `${validate.requirements.username.illegal} "'"`);

// 3. Validate email error conditions
const invalidEmailErr = validate.email("not-an-address");
assert.ok(invalidEmailErr instanceof Error);
assert.equal(invalidEmailErr.message, validate.requirements.email.valid);

const longEmailErr = validate.email(`${"a".repeat(245)}@example.com`);
assert.ok(longEmailErr instanceof Error);
assert.equal(longEmailErr.message, validate.requirements.email.length);