@vitest/utils 4.1.10: getType

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 @vitest/utils.getType in pkg:npm/%40vitest/utils@4.1.10
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40vitest/utils@4.1.10
Demonstrate these symbols/APIs:
  - @vitest/utils.getType

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:sha256:21dcdda56145d7f8413eeffd82b0db4f2b8e939a317110e3d6dbc8acf6290f4d","contract":["getType returns Null and Undefined for primitive null and undefined values","getType returns standard primitive type names for numbers, strings, booleans, symbols, and bigints","getType distinguishes built-in object structures including Array, Object, Map, Set, Date, and RegExp","getType identifies function variants such as Function, AsyncFunction, and GeneratorFunction","getType returns custom type tags defined via Symbol.toStringTag on object instances"],"goal":"verify @vitest/utils.getType in pkg:npm/%40vitest/utils@4.1.10","kind":"HOW","packages":["pkg:npm/%40vitest/utils@4.1.10"],"schemaVersion":1,"symbols":["@vitest/utils.getType"]},"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/%40vitest/utils@4.1.10"],"schemaVersion":1,"subject":"pkg:npm/%40vitest/utils@4.1.10","symbols":["@vitest/utils.getType"],"verifierAdapter":"node-typescript@1"}

import { getType } from '@vitest/utils/helpers';

export { getType };

export function inspectType(value) {
  return getType(value);
}

{
  "name": "sample-vitest-utils-gettype",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-vitest-utils-gettype",
      "version": "1.0.0",
      "dependencies": {
        "@vitest/utils": "4.1.10"
      }
    },
    "node_modules/@vitest/pretty-format": {
      "version": "4.1.10",
      "resolved": "https://registry.npmjs.org/@vitest/pretty-format/-/pretty-format-4.1.10.tgz",
      "integrity": "sha512-W1HsjSH4MXQ9YfmmhLAoIYf1HRfekQCGngeIgcei6MP5QQGWUe0gkopdZQaVCFO+JDJMrAJGwa5pRpNpvy4P8Q==",
      "license": "MIT",
      "dependencies": {
        "tinyrainbow": "^3.1.0"
      },
      "funding": {
        "url": "https://opencollective.com/vitest"
      }
    },
    "node_modules/@vitest/utils": {
      "version": "4.1.10",
      "resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-4.1.10.tgz",
      "integrity": "sha512-fy9am/HWxbaGt/Sawrp90vt6Y6jQwf1RX77cz3uwoJwJVMli/e1IEwRPnMNJ7vKfPTwo0diXifkpPvwH9v7nGA==",
      "license": "MIT",
      "dependencies": {
        "@vitest/pretty-format": "4.1.10",
        "convert-source-map": "^2.0.0",
        "tinyrainbow": "^3.1.0"
      },
      "funding": {
        "url": "https://opencollective.com/vitest"
      }
    },
    "node_modules/convert-source-map": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-2.0.0.tgz",
      "integrity": "sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==",
      "license": "MIT"
    },
    "node_modules/tinyrainbow": {
      "version": "3.1.1",
      "resolved": "https://registry.npmjs.org/tinyrainbow/-/tinyrainbow-3.1.1.tgz",
      "integrity": "sha512-yau8yJdTt989Mm0Bd/236QnzEiPf2xLLTqUZRUJOo/3CB078LSwzei343DgtJVmfJKJE3TMINY1u42SQsP6mXw==",
      "license": "MIT",
      "engines": {
        "node": ">=14.0.0"
      }
    }
  }
}

{
  "name": "sample-vitest-utils-gettype",
  "version": "1.0.0",
  "type": "module",
  "main": "index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@vitest/utils": "4.1.10"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @vitest/utils.getType in pkg:npm/%40vitest/utils@4.1.10",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40vitest/utils@4.1.10"
  ],
  "symbols": [
    "@vitest/utils.getType"
  ]
}

import assert from 'node:assert/strict';
import { getType } from '@vitest/utils/helpers';
import { inspectType } from '../index.mjs';

// 1. getType returns Null and Undefined for primitive null and undefined values
{
  assert.equal(getType(null), 'Null');
  assert.equal(getType(undefined), 'Undefined');
  assert.equal(inspectType(null), 'Null');
  assert.equal(inspectType(undefined), 'Undefined');
}

// 2. getType returns standard primitive type names for numbers, strings, booleans, symbols, and bigints
{
  assert.equal(getType(0), 'Number');
  assert.equal(getType(-42.5), 'Number');
  assert.equal(getType(NaN), 'Number');
  assert.equal(getType(Infinity), 'Number');
  assert.equal(getType(''), 'String');
  assert.equal(getType('vitest'), 'String');
  assert.equal(getType(true), 'Boolean');
  assert.equal(getType(false), 'Boolean');
  assert.equal(getType(Symbol('sample')), 'Symbol');
  assert.equal(getType(100n), 'BigInt');
}

// 3. getType distinguishes built-in object structures including Array, Object, Map, Set, Date, and RegExp
{
  assert.equal(getType([]), 'Array');
  assert.equal(getType([1, 2, 3]), 'Array');
  assert.equal(getType({}), 'Object');
  assert.equal(getType({ key: 'val' }), 'Object');
  assert.equal(getType(new Map()), 'Map');
  assert.equal(getType(new Set()), 'Set');
  assert.equal(getType(new Date()), 'Date');
  assert.equal(getType(/vitest/i), 'RegExp');
  assert.equal(getType(new Error('failure')), 'Error');
  assert.equal(getType(new TypeError('type mismatch')), 'Error');
  assert.equal(getType(Promise.resolve()), 'Promise');
  assert.equal(getType(new Uint8Array(4)), 'Uint8Array');
}

// 4. getType identifies function variants such as Function, AsyncFunction, and GeneratorFunction
{
  function standardFunc() {}
  const arrowFunc = () => {};
  async function asyncFunc() {}
  function* generatorFunc() {}

  assert.equal(getType(standardFunc), 'Function');
  assert.equal(getType(arrowFunc), 'Function');
  assert.equal(getType(asyncFunc), 'AsyncFunction');
  assert.equal(getType(generatorFunc), 'GeneratorFunction');
}

// 5. getType returns custom type tags defined via Symbol.toStringTag on object instances
{
  const customObject = {
    [Symbol.toStringTag]: 'CustomWidget',
  };
  assert.equal(getType(customObject), 'CustomWidget');

  class ServiceUnit {
    get [Symbol.toStringTag]() {
      return 'ServiceUnit';
    }
  }
  assert.equal(getType(new ServiceUnit()), 'ServiceUnit');
  assert.equal(inspectType(new ServiceUnit()), 'ServiceUnit');
}

console.log('All @vitest/utils getType contract assertions passed.');