type-fest 0.13.1: Primitive

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 type-fest.Primitive in pkg:npm/type-fest@0.13.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/type-fest@0.13.1
Demonstrate these symbols/APIs:
  - type-fest.Primitive

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:sha256:1d491a8c3df8ae527f1880e494284735bd8fc3c8c22319209a4d3b34db56727e","contract":["type-fest package.json defines package name as type-fest and version as 0.13.1 with types entry point","type-fest index declarations re-export basic type definitions including Primitive","basic declarations export Primitive type alias","Primitive type union includes null undefined string number boolean symbol and bigint","Primitive type definition includes JSDoc documentation referencing MDN primitive value specification"],"goal":"verify type-fest.Primitive in pkg:npm/type-fest@0.13.1","kind":"HOW","packages":["pkg:npm/type-fest@0.13.1"],"schemaVersion":1,"symbols":["type-fest.Primitive"]},"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/type-fest@0.13.1"],"schemaVersion":1,"subject":"pkg:npm/type-fest@0.13.1","symbols":["type-fest.Primitive"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-type-fest-primitive",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-type-fest-primitive",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "type-fest": "0.13.1"
      }
    },
    "node_modules/type-fest": {
      "version": "0.13.1",
      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.13.1.tgz",
      "integrity": "sha512-34R7HTnG0XIJcBSn5XhDd7nNFPRcXYRZrBB2O2jdKqYODldSzBAqzsWoZYYvduky73toYS/ESqxPvkDf/F0XMg==",
      "license": "(MIT OR CC0-1.0)",
      "engines": {
        "node": ">=10"
      },
      "funding": {
        "url": "https://github.com/sponsors/sindresorhus"
      }
    }
  }
}

{
  "name": "sample-type-fest-primitive",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "type-fest": "0.13.1"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify type-fest.Primitive in pkg:npm/type-fest@0.13.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/type-fest@0.13.1"
  ],
  "symbols": [
    "type-fest.Primitive"
  ]
}

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);

// Contract 1: type-fest package.json defines package name as type-fest and version as 0.13.1 with types entry point
{
  const pkgJson = require('type-fest/package.json');
  assert.equal(pkgJson.name, 'type-fest');
  assert.equal(pkgJson.version, '0.13.1');
  assert.equal(pkgJson.types, 'index.d.ts');
}

// Contract 2: type-fest index declarations re-export basic type definitions including Primitive
{
  const pkgDir = path.dirname(require.resolve('type-fest/package.json'));
  const indexDtsPath = path.join(pkgDir, 'index.d.ts');
  assert.ok(fs.existsSync(indexDtsPath), 'index.d.ts must exist');
  const indexDtsContent = fs.readFileSync(indexDtsPath, 'utf8');
  assert.ok(
    indexDtsContent.includes("export * from './source/basic';"),
    'basic definitions must be re-exported from index.d.ts'
  );
}

// Contract 3: basic declarations export Primitive type alias
{
  const pkgDir = path.dirname(require.resolve('type-fest/package.json'));
  const basicDtsPath = path.join(pkgDir, 'source', 'basic.d.ts');
  assert.ok(fs.existsSync(basicDtsPath), 'source/basic.d.ts must exist');
  const basicDtsContent = fs.readFileSync(basicDtsPath, 'utf8');
  assert.ok(
    basicDtsContent.includes('export type Primitive ='),
    'Primitive type alias must be exported in source/basic.d.ts'
  );
}

// Contract 4: Primitive type union includes null undefined string number boolean symbol and bigint
{
  const pkgDir = path.dirname(require.resolve('type-fest/package.json'));
  const basicDtsPath = path.join(pkgDir, 'source', 'basic.d.ts');
  const basicDtsContent = fs.readFileSync(basicDtsPath, 'utf8');
  const expectedPrimitives = [
    'null',
    'undefined',
    'string',
    'number',
    'boolean',
    'symbol',
    'bigint'
  ];
  for (const primitiveType of expectedPrimitives) {
    assert.ok(
      basicDtsContent.includes(`| ${primitiveType}`),
      `Primitive union must include ${primitiveType}`
    );
  }
}

// Contract 5: Primitive type definition includes JSDoc documentation referencing MDN primitive value specification
{
  const pkgDir = path.dirname(require.resolve('type-fest/package.json'));
  const basicDtsPath = path.join(pkgDir, 'source', 'basic.d.ts');
  const basicDtsContent = fs.readFileSync(basicDtsPath, 'utf8');
  assert.ok(
    basicDtsContent.includes('Matches any [primitive value](https://developer.mozilla.org/en-US/docs/Glossary/Primitive).'),
    'Primitive documentation must reference MDN documentation'
  );
}

console.log('All pkg:npm/type-fest@0.13.1 Primitive contracts passed successfully.');