type-fest 0.13.1: PartialDeep

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.PartialDeep 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.PartialDeep

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:sha256:080a415f30540e8b1f6c38cb02f47487dea44c9ba81dca54c932a60efd55ec04","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 export PartialDeep symbol","PartialDeep type definition makes object properties recursively optional","PartialDeep type definition handles Map and Set types with deep partial equivalents","PartialDeep type definition preserves primitive types with Partial fallback and functions with undefined union"],"goal":"verify type-fest.PartialDeep in pkg:npm/type-fest@0.13.1","kind":"HOW","packages":["pkg:npm/type-fest@0.13.1"],"schemaVersion":1,"symbols":["type-fest.PartialDeep"]},"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.PartialDeep"],"verifierAdapter":"node-typescript@1"}

{
  "name": "sample-type-fest-partial-deep",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-type-fest-partial-deep",
      "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-partial-deep",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "type-fest": "0.13.1"
  }
}

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

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 export PartialDeep symbol
{
  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 {PartialDeep} from './source/partial-deep';"),
    'PartialDeep must be exported from index.d.ts'
  );
}

// Contract 3: PartialDeep type definition makes object properties recursively optional
{
  const pkgDir = path.dirname(require.resolve('type-fest/package.json'));
  const partialDeepDtsPath = path.join(pkgDir, 'source', 'partial-deep.d.ts');
  assert.ok(fs.existsSync(partialDeepDtsPath), 'source/partial-deep.d.ts must exist');
  const partialDeepContent = fs.readFileSync(partialDeepDtsPath, 'utf8');
  assert.ok(
    partialDeepContent.includes('export type PartialDeep<T> = T extends Primitive'),
    'PartialDeep type definition must be exported'
  );
  assert.ok(
    partialDeepContent.includes('type PartialObjectDeep<ObjectType extends object> = {'),
    'PartialObjectDeep helper must be defined'
  );
  assert.ok(
    partialDeepContent.includes('[KeyType in keyof ObjectType]?: PartialDeep<ObjectType[KeyType]>'),
    'PartialObjectDeep must map properties recursively as optional'
  );
}

// Contract 4: PartialDeep type definition handles Map and Set types with deep partial equivalents
{
  const pkgDir = path.dirname(require.resolve('type-fest/package.json'));
  const partialDeepDtsPath = path.join(pkgDir, 'source', 'partial-deep.d.ts');
  const partialDeepContent = fs.readFileSync(partialDeepDtsPath, 'utf8');
  assert.ok(
    partialDeepContent.includes('interface PartialMapDeep<KeyType, ValueType> extends Map<PartialDeep<KeyType>, PartialDeep<ValueType>> {}'),
    'PartialMapDeep must recursively wrap Map keys and values'
  );
  assert.ok(
    partialDeepContent.includes('interface PartialSetDeep<T> extends Set<PartialDeep<T>> {}'),
    'PartialSetDeep must recursively wrap Set items'
  );
  assert.ok(
    partialDeepContent.includes('interface PartialReadonlyMapDeep<KeyType, ValueType> extends ReadonlyMap<PartialDeep<KeyType>, PartialDeep<ValueType>> {}'),
    'PartialReadonlyMapDeep must wrap ReadonlyMap keys and values'
  );
  assert.ok(
    partialDeepContent.includes('interface PartialReadonlySetDeep<T> extends ReadonlySet<PartialDeep<T>> {}'),
    'PartialReadonlySetDeep must wrap ReadonlySet items'
  );
}

// Contract 5: PartialDeep type definition preserves primitive types with Partial fallback and functions with undefined union
{
  const pkgDir = path.dirname(require.resolve('type-fest/package.json'));
  const partialDeepDtsPath = path.join(pkgDir, 'source', 'partial-deep.d.ts');
  const partialDeepContent = fs.readFileSync(partialDeepDtsPath, 'utf8');
  assert.ok(
    partialDeepContent.includes('? Partial<T>'),
    'PartialDeep must fall back to Partial<T> for primitives'
  );
  assert.ok(
    partialDeepContent.includes(': T extends ((...arguments: any[]) => unknown)'),
    'PartialDeep must check function types'
  );
  assert.ok(
    partialDeepContent.includes('? T | undefined'),
    'PartialDeep must allow functions to be undefined'
  );
}

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