CodeSampleX

Ejemplo

@jest/console 29.7.0: NullConsole

Muestra verificada para npm @jest/console 29.7.0: NullConsole. El contrato se ejecutó en node 22 · linux alpine/x64 · docker y pasó.

sha256:c293b57a2933bf1728696545a605eb0964eab66e23c3f7729ba82689cfb821b7

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado linux 24 · ubuntu · glibc 2.39 x64 npm

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
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…		 2026-08-27

Caso

HOW
Objetivo
verify @jest/console.NullConsole in pkg:npm/%40jest/console@29.7.0
Paquetes
Símbolos
  • @jest/console.NullConsole
Creado
2026-08-27T18:02:08Z

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

Archivos

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

Descargar el artefacto de código fuente (tar.gz)

Código fuente

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@29.7.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40jest/console@29.7.0
Demonstrate these symbols/APIs:
  - @jest/console.NullConsole

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:b97b06c9d24dca19ee00f760c68d3830b7bd13ece52e422daeca4ffa1faf36a0","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@29.7.0","kind":"HOW","packages":["pkg:npm/%40jest/console@29.7.0"],"schemaVersion":1,"symbols":["@jest/console.NullConsole"]},"contractCommand":["node","test/contract.js"],"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/%40jest/console@29.7.0"],"schemaVersion":1,"subject":"pkg:npm/%40jest/console@29.7.0","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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  "name": "sample-jest-console-null",
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      }
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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@29.7.0",
  "main": "index.js",
  "scripts": {
    "test": "node test/contract.js"
  },
  "dependencies": {
    "@jest/console": "29.7.0"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @jest/console.NullConsole in pkg:npm/%40jest/console@29.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40jest/console@29.7.0"
  ],
  "symbols": [
    "@jest/console.NullConsole"
  ]
}
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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