csstype 3.2.3: CSS style object type checking with csstype Properties and StandardProperties

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: CSS style object type checking with csstype Properties and StandardProperties
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/csstype@3.2.3
Demonstrate these symbols/APIs:
  - Properties
  - PropertiesHyphen

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:be7617a7ab1cb752d85339377ac23243d779bd8c034fc4068fc1a77b86234328","contract":["csstype package.json declares type definitions entry point index.d.ts and version 3.2.3","csstype index.d.ts exports Properties interface extending StandardProperties, VendorProperties, ObsoleteProperties, and SvgProperties","csstype index.d.ts exports PropertiesHyphen interface extending StandardPropertiesHyphen, VendorPropertiesHyphen, ObsoletePropertiesHyphen, and SvgPropertiesHyphen","csstype index.d.ts exports StandardProperties and StandardPropertiesHyphen interfaces extending longhand and shorthand properties","csstype index.d.ts exports Property namespace containing CSS property type definitions including AccentColor, AlignContent, AlignItems, and Display","csstype index.d.ts exports Globals type union and Fallback helper type for CSS fallback property arrays"],"goal":"CSS style object type checking with csstype Properties and StandardProperties","kind":"HOW","packages":["pkg:npm/csstype@3.2.3"],"schemaVersion":1,"symbols":["Properties","PropertiesHyphen"]},"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/csstype@3.2.3"],"schemaVersion":1,"subject":"pkg:npm/csstype@3.2.3","symbols":["Properties","PropertiesHyphen"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-csstype",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-csstype",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "csstype": "3.2.3"
      }
    },
    "node_modules/csstype": {
      "version": "3.2.3",
      "resolved": "https://registry.npmjs.org/csstype/-/csstype-3.2.3.tgz",
      "integrity": "sha512-z1HGKcYy2xA8AGQfwrn0PAy+PB7X/GSj3UVJW9qKyn43xWa+gl5nXmU4qqLMRzWVLFC8KusUX8T/0kCiOYpAIQ==",
      "license": "MIT"
    }
  }
}

{
  "name": "sample-csstype",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "csstype": "3.2.3"
  }
}

{
  "schemaVersion": 1,
  "goal": "CSS style object type checking with csstype Properties and StandardProperties",
  "kind": "HOW",
  "packages": [
    "pkg:npm/csstype@3.2.3"
  ],
  "symbols": [
    "Properties",
    "PropertiesHyphen"
  ]
}

import assert from 'node:assert/strict';
import fs from 'node:fs';
import path from 'node:path';
import { createRequire } from 'node:module';

const require = createRequire(import.meta.url);

// 1. csstype package.json declares type definitions entry point index.d.ts and version 3.2.3
const pkgJsonPath = require.resolve('csstype/package.json');
assert.ok(fs.existsSync(pkgJsonPath));
const pkgJson = JSON.parse(fs.readFileSync(pkgJsonPath, 'utf8'));
assert.equal(pkgJson.name, 'csstype');
assert.equal(pkgJson.version, '3.2.3');
assert.equal(pkgJson.types, 'index.d.ts');

const pkgDir = path.dirname(pkgJsonPath);

// 2. csstype index.d.ts exports Properties interface extending StandardProperties, VendorProperties, ObsoleteProperties, and SvgProperties
const dtsPath = path.join(pkgDir, 'index.d.ts');
assert.ok(fs.existsSync(dtsPath));
const dtsContent = fs.readFileSync(dtsPath, 'utf8');

assert.ok(dtsContent.includes('export interface Properties<TLength = (string & {}) | 0, TTime = string & {}>'));
assert.ok(dtsContent.includes('StandardProperties<TLength, TTime>,'));
assert.ok(dtsContent.includes('VendorProperties<TLength, TTime>,'));
assert.ok(dtsContent.includes('ObsoleteProperties<TLength, TTime>,'));
assert.ok(dtsContent.includes('SvgProperties<TLength, TTime>'));

// 3. csstype index.d.ts exports PropertiesHyphen interface extending StandardPropertiesHyphen, VendorPropertiesHyphen, ObsoletePropertiesHyphen, and SvgPropertiesHyphen
assert.ok(dtsContent.includes('export interface PropertiesHyphen<TLength = (string & {}) | 0, TTime = string & {}>'));
assert.ok(dtsContent.includes('StandardPropertiesHyphen<TLength, TTime>,'));
assert.ok(dtsContent.includes('VendorPropertiesHyphen<TLength, TTime>,'));
assert.ok(dtsContent.includes('ObsoletePropertiesHyphen<TLength, TTime>,'));
assert.ok(dtsContent.includes('SvgPropertiesHyphen<TLength, TTime>'));

// 4. csstype index.d.ts exports StandardProperties and StandardPropertiesHyphen interfaces extending longhand and shorthand properties
assert.ok(dtsContent.includes('export interface StandardProperties<TLength = (string & {}) | 0, TTime = string & {}>'));
assert.ok(dtsContent.includes('export interface StandardPropertiesHyphen<TLength = (string & {}) | 0, TTime = string & {}>'));
assert.ok(dtsContent.includes('StandardLonghandProperties<TLength, TTime>'));
assert.ok(dtsContent.includes('StandardShorthandProperties<TLength, TTime>'));

// 5. csstype index.d.ts exports Property namespace containing CSS property type definitions including AccentColor, AlignContent, AlignItems, and Display
assert.ok(dtsContent.includes('export namespace Property {'));
assert.ok(dtsContent.includes('export type AccentColor = Globals | DataType.Color | "auto";'));
assert.ok(dtsContent.includes('export type AlignContent = Globals | DataType.ContentDistribution | DataType.ContentPosition | "baseline" | "normal" | (string & {});'));
assert.ok(dtsContent.includes('export type AlignItems = Globals | DataType.SelfPosition | "anchor-center" | "baseline" | "normal" | "stretch" | (string & {});'));
assert.ok(dtsContent.includes('export type Display ='));

// 6. csstype index.d.ts exports Globals type union and Fallback helper type for CSS fallback property arrays
assert.ok(dtsContent.includes('export type Globals = "-moz-initial" | "inherit" | "initial" | "revert" | "revert-layer" | "unset";'));
assert.ok(dtsContent.includes('export type Fallback<T> = { [P in keyof T]: T[P] | readonly NonNullable<T[P]>[] };'));
assert.ok(dtsContent.includes('export interface PropertiesFallback<TLength = (string & {}) | 0, TTime = string & {}>'));
assert.ok(dtsContent.includes('export interface PropertiesHyphenFallback<TLength = (string & {}) | 0, TTime = string & {}>'));

console.log('All contract tests passed.');