CodeSampleX

Exemplo

@jest/console 30.4.1: NullConsole

Amostra verificada para npm @jest/console 30.4.1: NullConsole. O contrato rodou em node 22 · linux debian/x64 · docker e passou.

sha256:2efe65ec27e092417cb3e9e41a5c464b51f394218671858989a135a3e9fe082a

Esta rede oferece uma coisa: uma amostra que compila. Ela a executou em um sandbox e guardou o recibo assinado. Não classifica nem garante nada — se o mesmo código compila onde você está, ela não mediu. Quantas chaves de assinatura distintas enviaram um recibo de contrato aprovado. Uma é só o autor; mais de uma significa que outra pessoa também o compilou. Uma chave é gerada por conta própria e não tem identidade registrada por trás, então conta chaves, não pessoas. MIT-0

Evidência de execução

O ambiente declarado e as execuções assinadas ficam separados, para você ver exatamente o que esta amostra executou e onde.

Base da evidência
Contrato assinado aprovado
Recibos de verificação
1
Chaves de assinatura que o compilaram
1
Ambiente declarado node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Ambientes das execuções de verificação

Ambiente Contrato Etapas Execução
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-06

Caso

HOW
Objetivo
verify @jest/console.NullConsole in pkg:npm/%40jest/console@30.4.1
Pacotes
Símbolos
  • @jest/console.NullConsole
Ambiente
node 22.23.2
Criado
2026-09-06T03:13:30Z

Contrato

  1. NullConsole constructor requires writable stream instances for stdout and stderr or throws ERR_CONSOLE_WRITABLE_STREAM
  2. createNullConsole creates a NullConsole instance with default no-op writable streams
  3. NullConsole suppresses log, info, warn, error, and debug messages without writing to output streams
  4. NullConsole assert, dir, and trace methods execute as no-ops without throwing errors
  5. NullConsole group, groupCollapsed, and groupEnd manage indentation state silently without writing output
  6. NullConsole time, timeEnd, timeLog, count, and countReset execute silently without logging
  7. withNullConsole temporarily silences global console output during function execution and restores the original console

Arquivos

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

Baixar o artefato de código-fonte (tar.gz)

Código-fonte

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 @jest/console.NullConsole in pkg:npm/%40jest/console@30.4.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40jest/console@30.4.1
Demonstrate these symbols/APIs:
  - @jest/console.NullConsole
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:a1e600ce042cc430732646ae11eefc0eb9625c7813ac864a08996097887a32de","constraints":{"executionContext":"node"},"contract":["NullConsole constructor requires writable stream instances for stdout and stderr or throws ERR_CONSOLE_WRITABLE_STREAM","createNullConsole creates a NullConsole instance with default no-op writable streams","NullConsole suppresses log, info, warn, error, and debug messages without writing to output streams","NullConsole assert, dir, and trace methods execute as no-ops without throwing errors","NullConsole group, groupCollapsed, and groupEnd manage indentation state silently without writing output","NullConsole time, timeEnd, timeLog, count, and countReset execute silently without logging","withNullConsole temporarily silences global console output during function execution and restores the original console"],"goal":"verify @jest/console.NullConsole in pkg:npm/%40jest/console@30.4.1","kind":"HOW","packages":["pkg:npm/%40jest/console@30.4.1"],"schemaVersion":1,"symbols":["@jest/console.NullConsole"]},"contractCommand":["node","test/contract.js"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"cjs","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40jest/console@30.4.1"],"schemaVersion":1,"subject":"pkg:npm/%40jest/console@30.4.1","symbols":["@jest/console.NullConsole"],"verifierAdapter":"node-typescript@1"}
index.js
'use strict';

const { Writable } = require('stream');
const { NullConsole } = require('@jest/console');

/**
 * Creates a no-op writable stream that discards all written data.
 * @returns {Writable} A no-op writable stream.
 */
function createNullStream() {
  return new Writable({
    write(_chunk, _encoding, callback) {
      callback();
    }
  });
}

/**
 * Creates a NullConsole instance initialized with no-op writable streams.
 * If custom stdout or stderr streams are provided, they are forwarded to the constructor.
 *
 * @param {Writable} [stdout] - Optional stdout stream (defaults to no-op writable stream).
 * @param {Writable} [stderr] - Optional stderr stream (defaults to no-op writable stream).
 * @param {Function} [formatBuffer] - Optional formatBuffer transformer function.
 * @returns {NullConsole} A configured NullConsole instance.
 */
function createNullConsole(
  stdout = createNullStream(),
  stderr = createNullStream(),
  formatBuffer = (_type, message) => message
) {
  return new NullConsole(stdout, stderr, formatBuffer);
}

/**
 * Executes a function with global.console temporarily replaced by a NullConsole,
 * suppressing any console logs generated during the function's execution.
 * Restores the original global.console afterwards.
 *
 * @param {Function} fn - Synchronous or async function to execute in silenced mode.
 * @returns {*} The return value of fn.
 */
function withNullConsole(fn) {
  const nullConsole = createNullConsole();
  const originalConsole = global.console;
  try {
    global.console = nullConsole;
    return fn(nullConsole);
  } finally {
    global.console = originalConsole;
  }
}

module.exports = {
  NullConsole,
  createNullStream,
  createNullConsole,
  withNullConsole
};
package-lock.json
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package.json
{
  "name": "sample-jest-console-null",
  "version": "1.0.0",
  "private": true,
  "description": "verify @jest/console.NullConsole in pkg:npm/%40jest/console@30.4.1",
  "main": "index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@jest/console": "30.4.1"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @jest/console.NullConsole in pkg:npm/%40jest/console@30.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40jest/console@30.4.1"
  ],
  "symbols": [
    "@jest/console.NullConsole"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.js
'use strict';

const assert = require('assert');
const { Writable } = require('stream');
const {
  NullConsole,
  createNullStream,
  createNullConsole,
  withNullConsole
} = require('../index.js');

function testNullConsoleDirectInstantiation() {
  assert.throws(
    () => new NullConsole(),
    (err) => {
      return (
        err instanceof TypeError &&
        err.code === 'ERR_CONSOLE_WRITABLE_STREAM'
      );
    },
    'new NullConsole() without streams should throw ERR_CONSOLE_WRITABLE_STREAM'
  );

  let streamWrites = 0;
  const customStream = new Writable({
    write(_chunk, _encoding, callback) {
      streamWrites++;
      callback();
    }
  });

  const nc = new NullConsole(customStream, customStream);
  assert.ok(nc instanceof NullConsole, 'nc should be an instance of NullConsole');
  assert.strictEqual(nc.getBuffer(), undefined, 'NullConsole.getBuffer() should be undefined');
  assert.strictEqual(streamWrites, 0, 'No stream writes on instantiation');
}

function testCreateNullConsoleHelper() {
  const nc = createNullConsole();
  assert.ok(nc instanceof NullConsole, 'createNullConsole should return a NullConsole instance');
  assert.strictEqual(nc.getBuffer(), undefined, 'getBuffer should return undefined');
}

function testNullConsoleSuppressesOutput() {
  let writes = 0;
  const trackingStream = new Writable({
    write(_chunk, _encoding, callback) {
      writes++;
      callback();
    }
  });

  const nc = createNullConsole(trackingStream, trackingStream);

  nc.log('sample log message %s', 'formatted');
  nc.info('sample info message');
  nc.warn('sample warn message');
  nc.error('sample error message');
  nc.debug('sample debug message');

  assert.strictEqual(writes, 0, 'Logging methods must not write to streams');
}

function testNullConsoleNoOpMethods() {
  const nc = createNullConsole();

  assert.doesNotThrow(() => {
    nc.assert(false, 'this assertion should be ignored');
    nc.assert(true, 'truthy assertion');
  });

  assert.doesNotThrow(() => {
    nc.dir({ key: 'value', nested: [1, 2, 3] });
    nc.trace('sample trace');
  });
}

function testNullConsoleGrouping() {
  const nc = createNullConsole();

  assert.doesNotThrow(() => {
    nc.group('Group Level 1');
    nc.log('Grouped log 1');
    nc.groupCollapsed('Group Level 2');
    nc.log('Grouped log 2');
    nc.groupEnd();
    nc.groupEnd();
  });
}

function testNullConsoleTimingAndCounting() {
  const nc = createNullConsole();

  assert.doesNotThrow(() => {
    nc.time('benchmark-timer');
    nc.timeLog('benchmark-timer', 'checkpoint');
    nc.timeEnd('benchmark-timer');

    nc.count('counter');
    nc.count('counter');
    nc.countReset('counter');
  });
}

function testWithNullConsoleExecution() {
  let innerLogCalled = false;
  const originalConsole = global.console;

  const result = withNullConsole((silencedConsole) => {
    assert.ok(silencedConsole instanceof NullConsole);
    assert.strictEqual(global.console, silencedConsole);

    console.log('This log should be completely silenced');
    console.error('This error should be completely silenced');
    innerLogCalled = true;
    return 100;
  });

  assert.strictEqual(result, 100, 'withNullConsole returns inner function result');
  assert.strictEqual(innerLogCalled, true, 'inner function executed');
  assert.strictEqual(global.console, originalConsole, 'global.console restored after execution');
}

function testWithNullConsoleExceptionSafety() {
  const originalConsole = global.console;

  assert.throws(
    () => {
      withNullConsole(() => {
        throw new Error('Test error inside withNullConsole');
      });
    },
    /Test error inside withNullConsole/
  );

  assert.strictEqual(global.console, originalConsole, 'global.console restored even on exception');
}

function main() {
  testNullConsoleDirectInstantiation();
  testCreateNullConsoleHelper();
  testNullConsoleSuppressesOutput();
  testNullConsoleNoOpMethods();
  testNullConsoleGrouping();
  testNullConsoleTimingAndCounting();
  testWithNullConsoleExecution();
  testWithNullConsoleExceptionSafety();
  console.log('All @jest/console.NullConsole contract tests passed successfully.');
}

main();

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