CodeSampleX

Sample

vitest 4.1.11: createVitest, parseCLI, defineConfig

Verified sample for npm vitest 4.1.11: createVitest, parseCLI, defineConfig. The contract ran on node 22 · linux alpine/x64 · docker and passed.

sha256:a00833bdf2259fdeb0a1b8cd973f44b61d120100bca469f45b1d4c1ba79a9e2c

This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured. How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people. MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis
Signed contract pass
Verification receipts
1
Signing keys that built it
1
Declared environment node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-28

Case

HOW
Goal
verify pkg:npm/vitest@4.1.11
Packages
Symbols
  • createVitest
  • parseCLI
  • defineConfig
  • mergeConfig
Environment
node 22.23.2
Created
2026-08-28T08:24:55Z

Contract

  1. assert parseCLI parses run mode, boolean flags, numeric flags, and positional filter paths
  2. assert parseCLI captures watch mode, reporter arrays, and passthrough arguments after double dash
  3. assert createVitest initializes Vitest runner instance with version 4.1.11 and resolved config
  4. assert Vitest instance provides workspace projects and root project access
  5. assert Vitest instance supports provide and getProvidedContext for cross-test data sharing
  6. assert Vitest instance invokes onClose callbacks on close() shutdown
  7. assert createVitest initializes alternate benchmark execution mode
  8. assert defineConfig and mergeConfig deep merge configuration objects
  9. assert vi.fn creates spies tracking invocations and return values
  10. assert vi.spyOn intercepts method execution and mockRestore restores original method

Files

  • PROMPT.md
  • csx.json
  • index.mjs
  • package-lock.json
  • package.json
  • spec.json
  • test/contract.mjs

Download the source artifact (tar.gz)

Source

PROMPT.md
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/vitest@4.1.11
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/vitest@4.1.11

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.
csx.json
{"case":{"caseId":"case:sha256:97fc87672811a86416d453eef61dd25f1b3aa0cce6181801cae27c010108ff6f","contract":["assert parseCLI parses run mode, boolean flags, numeric flags, and positional filter paths","assert parseCLI captures watch mode, reporter arrays, and passthrough arguments after double dash","assert createVitest initializes Vitest runner instance with version 4.1.11 and resolved config","assert Vitest instance provides workspace projects and root project access","assert Vitest instance supports provide and getProvidedContext for cross-test data sharing","assert Vitest instance invokes onClose callbacks on close() shutdown","assert createVitest initializes alternate benchmark execution mode","assert defineConfig and mergeConfig deep merge configuration objects","assert vi.fn creates spies tracking invocations and return values","assert vi.spyOn intercepts method execution and mockRestore restores original method"],"goal":"verify pkg:npm/vitest@4.1.11","kind":"HOW","packages":["pkg:npm/vitest@4.1.11"],"schemaVersion":1,"symbols":["createVitest","parseCLI","defineConfig","mergeConfig"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/vitest@4.1.11"],"schemaVersion":1,"subject":"pkg:npm/vitest@4.1.11","symbols":["createVitest","parseCLI","defineConfig","mergeConfig"],"verifierAdapter":"node-typescript@1"}
index.mjs
import { createVitest, parseCLI } from 'vitest/node';
import { defineConfig, mergeConfig } from 'vitest/config';
import { vi } from 'vitest';

/**
 * Parses Vitest command line arguments into options and filters.
 * @param {string|string[]} argv
 * @returns {{ filter: string[], options: Record<string, any> }}
 */
export function parseVitestArgs(argv) {
  return parseCLI(argv);
}

/**
 * Initializes a Vitest programmatic runner instance.
 * @param {'test'|'benchmark'|'typecheck'} mode
 * @param {Record<string, any>} [options]
 * @returns {Promise<any>}
 */
export async function createVitestRunner(mode = 'test', options = {}) {
  return createVitest(mode, {
    watch: false,
    run: false,
    silent: true,
    ...options,
  });
}

/**
 * Defines a Vitest configuration object.
 * @param {Record<string, any>} config
 * @returns {Record<string, any>}
 */
export function defineVitestConfig(config) {
  return defineConfig(config);
}

/**
 * Merges two Vitest configuration objects.
 * @param {Record<string, any>} base
 * @param {Record<string, any>} overrides
 * @returns {Record<string, any>}
 */
export function mergeVitestConfigs(base, overrides) {
  return mergeConfig(base, overrides);
}

/**
 * Creates a mock function with call tracking.
 * @param {Function} [implementation]
 * @returns {Function}
 */
export function createMockFunction(implementation) {
  return vi.fn(implementation);
}

/**
 * Spies on an object method.
 * @param {object} target
 * @param {string} methodName
 * @returns {object}
 */
export function createSpy(target, methodName) {
  return vi.spyOn(target, methodName);
}
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}
package.json
{
  "name": "sample-vitest",
  "version": "1.0.0",
  "type": "module",
  "description": "Clean-room verification for vitest@4.1.11",
  "main": "index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "vitest": "4.1.11"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/vitest@4.1.11",
  "kind": "HOW",
  "packages": [
    "pkg:npm/vitest@4.1.11"
  ]
}
test/contract.mjs
import assert from 'node:assert/strict';
import {
  parseVitestArgs,
  createVitestRunner,
  defineVitestConfig,
  mergeVitestConfigs,
  createMockFunction,
  createSpy,
} from '../index.mjs';

async function runContract() {
  // 1. parseVitestArgs parses run mode, boolean flags, numeric flags, and positional filter paths
  const runParsed = parseVitestArgs('vitest run --isolate false --bail 1 test/unit.test.ts');
  assert.equal(runParsed.options.run, true, 'parseCLI sets options.run to true');
  assert.equal(runParsed.options.isolate, false, 'parseCLI normalizes --isolate false');
  assert.equal(runParsed.options.bail, 1, 'parseCLI casts --bail to number');
  assert.deepEqual(runParsed.filter, ['test/unit.test.ts'], 'parseCLI extracts positional test paths');

  // 2. parseVitestArgs captures watch mode, reporter arrays, and passthrough arguments after double dash
  const watchParsed = parseVitestArgs('vitest watch --reporter dot -- --inspect-brk');
  assert.equal(watchParsed.options.watch, true, 'parseCLI sets options.watch to true');
  assert.deepEqual(watchParsed.options.reporter, ['dot'], 'parseCLI aggregates reporter flags');
  assert.deepEqual(watchParsed.options['--'], ['--inspect-brk'], 'parseCLI preserves passthrough options after --');

  // 3. createVitestRunner initializes Vitest runner instance with version 4.1.11 and resolved config
  const vitest = await createVitestRunner('test', {
    testTimeout: 5000,
    isolate: false,
  });
  assert.equal(vitest.mode, 'test', 'vitest.mode equals test');
  assert.equal(vitest.version, '4.1.11', 'vitest.version equals 4.1.11');
  assert.equal(vitest.config.watch, false, 'vitest.config.watch is resolved to false');
  assert.equal(vitest.config.testTimeout, 5000, 'vitest.config.testTimeout is resolved to 5000');
  assert.equal(vitest.config.isolate, false, 'vitest.config.isolate is resolved to false');
  assert.equal(vitest.config.silent, true, 'vitest.config.silent is resolved to true');

  // 4. Vitest instance provides workspace projects and root project access
  assert.equal(Array.isArray(vitest.projects), true, 'vitest.projects is an array');
  assert.equal(vitest.projects.length >= 1, true, 'vitest has at least one workspace project');
  const rootProject = vitest.getRootProject();
  assert.ok(rootProject, 'vitest.getRootProject() returns root project');

  // 5. Vitest instance supports provide and getProvidedContext for cross-test data sharing
  vitest.provide('serviceEndpoint', 'https://example.com/api');
  vitest.provide('maxRetries', 3);
  const context = vitest.getProvidedContext();
  assert.deepEqual(
    context,
    { serviceEndpoint: 'https://example.com/api', maxRetries: 3 },
    'getProvidedContext returns mapped key-value pairs'
  );

  // 6. Vitest instance invokes onClose callbacks on close() shutdown
  let closed = false;
  vitest.onClose(() => {
    closed = true;
  });
  await vitest.close();
  assert.equal(closed, true, 'onClose hook triggers upon vitest.close()');

  // 7. createVitestRunner initializes alternate benchmark mode
  const benchVitest = await createVitestRunner('benchmark');
  assert.equal(benchVitest.mode, 'benchmark', 'vitest.mode equals benchmark');
  await benchVitest.close();

  // 8. defineVitestConfig and mergeVitestConfigs deep merge configuration objects
  const baseConfig = defineVitestConfig({
    test: {
      globals: true,
      environment: 'node',
      reporters: ['default'],
    },
  });
  const overrideConfig = defineVitestConfig({
    test: {
      testTimeout: 7500,
      isolate: false,
    },
  });
  const merged = mergeVitestConfigs(baseConfig, overrideConfig);
  assert.equal(merged.test.globals, true, 'merged config preserves base properties');
  assert.equal(merged.test.environment, 'node', 'merged config preserves base environment');
  assert.deepEqual(merged.test.reporters, ['default'], 'merged config preserves base reporters array');
  assert.equal(merged.test.testTimeout, 7500, 'merged config applies override testTimeout');
  assert.equal(merged.test.isolate, false, 'merged config applies override isolate');

  // 9. createMockFunction creates spies tracking invocations and return values
  const mockMultiplier = createMockFunction((val) => val * 3);
  assert.equal(mockMultiplier(4), 12, 'mock function executes implementation');
  assert.equal(mockMultiplier(10), 30, 'mock function executes implementation');
  assert.equal(mockMultiplier.mock.calls.length, 2, 'mock tracks invocation count');
  assert.deepEqual(mockMultiplier.mock.calls[0], [4], 'mock tracks first call argument');
  assert.deepEqual(mockMultiplier.mock.calls[1], [10], 'mock tracks second call argument');

  // 10. createSpy intercepts method execution and mockRestore restores original function
  const worker = {
    compute(n) {
      return n + 10;
    },
  };
  const spy = createSpy(worker, 'compute').mockReturnValue(999);
  assert.equal(worker.compute(5), 999, 'spy intercepts and returns mocked value');
  assert.equal(spy.mock.calls.length, 1, 'spy tracks call count');
  spy.mockRestore();
  assert.equal(worker.compute(5), 15, 'mockRestore restores original method');

  console.log('Contract assertions passed.');
}

runContract().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});

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