CodeSampleX

Ejemplo

@jest/console 29.7.0: BufferedConsole

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

sha256:98ec89d794b5a9f6cd63a8557d8dbf00fe7b259fa79e859c2035cc0e42faac65

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 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

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…		 2026-08-26

Caso

HOW
Objetivo
verify @jest/console.BufferedConsole in pkg:npm/%40jest/console@29.7.0
Paquetes
Símbolos
  • @jest/console.BufferedConsole
Entorno
node 22.23.2
Creado
2026-08-26T06:48:33Z

Contrato

  1. BufferedConsole instances buffer log, info, warn, error, and debug messages with type, message, and caller origin stack trace
  2. BufferedConsole.write appends structured log entries with specified log type directly to a target buffer array
  3. BufferedConsole manages indentation levels for grouped logs with group and groupCollapsed while groupEnd resets indentation
  4. BufferedConsole tracks execution duration with time and timeEnd, and invocation counts with count and countReset
  5. BufferedConsole.assert logs an AssertionError entry when condition is falsy and ignores truthy conditions
  6. BufferedConsole.dir formats JavaScript objects into inspectable string entries in the buffer
  7. captureConsoleLogs intercepts standard console output during function execution and restores the original global 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.BufferedConsole 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.BufferedConsole
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:a53b0612b3b9c3187b716af49eb2dd936bb5879049d22638bf8c7c58b818f57f","constraints":{"executionContext":"node"},"contract":["BufferedConsole instances buffer log, info, warn, error, and debug messages with type, message, and caller origin stack trace","BufferedConsole.write appends structured log entries with specified log type directly to a target buffer array","BufferedConsole manages indentation levels for grouped logs with group and groupCollapsed while groupEnd resets indentation","BufferedConsole tracks execution duration with time and timeEnd, and invocation counts with count and countReset","BufferedConsole.assert logs an AssertionError entry when condition is falsy and ignores truthy conditions","BufferedConsole.dir formats JavaScript objects into inspectable string entries in the buffer","captureConsoleLogs intercepts standard console output during function execution and restores the original global console"],"goal":"verify @jest/console.BufferedConsole in pkg:npm/%40jest/console@29.7.0","kind":"HOW","packages":["pkg:npm/%40jest/console@29.7.0"],"schemaVersion":1,"symbols":["@jest/console.BufferedConsole"]},"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@29.7.0"],"schemaVersion":1,"subject":"pkg:npm/%40jest/console@29.7.0","symbols":["@jest/console.BufferedConsole"],"verifierAdapter":"node-typescript@1"}
index.js
'use strict';

const { BufferedConsole } = require('@jest/console');

/**
 * Creates an instance of BufferedConsole.
 * @param {Function} [getSourceMaps] - Optional function that returns source map information.
 * @returns {BufferedConsole} A new BufferedConsole instance.
 */
function createBufferedConsole(getSourceMaps = () => null) {
  return new BufferedConsole(getSourceMaps);
}

/**
 * Appends a log entry directly to a buffer array using BufferedConsole.write.
 * @param {Array<object>} buffer - Destination buffer array.
 * @param {string} type - Log type (e.g. 'log', 'warn', 'error').
 * @param {string} message - The message text.
 * @param {number} [level=0] - Indentation level.
 * @returns {Array<object>} The modified buffer.
 */
function writeToBuffer(buffer, type, message, level = 0) {
  BufferedConsole.write(buffer, type, message, level);
  return buffer;
}

/**
 * Executes a function while intercepting global console calls into a BufferedConsole.
 * Restores global console upon completion or error.
 * @param {Function} fn - Synchronous function to execute with captured console.
 * @returns {{ result: any, buffer: Array<object>, console: BufferedConsole }} Execution result and captured buffer.
 */
function captureConsoleLogs(fn) {
  const bufferedConsole = createBufferedConsole();
  const originalConsole = global.console;
  let result;
  try {
    global.console = bufferedConsole;
    result = fn(bufferedConsole);
  } finally {
    global.console = originalConsole;
  }
  const buffer = bufferedConsole.getBuffer() || [];
  return {
    result,
    buffer,
    console: bufferedConsole
  };
}

module.exports = {
  BufferedConsole,
  createBufferedConsole,
  writeToBuffer,
  captureConsoleLogs
};
package-lock.json
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package.json
{
  "name": "sample-jest-console-buffered",
  "version": "1.0.0",
  "private": true,
  "description": "verify @jest/console.BufferedConsole 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.BufferedConsole in pkg:npm/%40jest/console@29.7.0",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40jest/console@29.7.0"
  ],
  "symbols": [
    "@jest/console.BufferedConsole"
  ],
  "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 {
  BufferedConsole,
  createBufferedConsole,
  writeToBuffer,
  captureConsoleLogs
} = require('../index.js');

function testBufferedConsoleBasicLogging() {
  const c = createBufferedConsole();
  c.log('sample log %s', 'message');
  c.info('sample info message');
  c.warn('sample warn message');
  c.error('sample error message');
  c.debug('sample debug message');

  const buffer = c.getBuffer();
  assert.ok(Array.isArray(buffer), 'buffer should be an array');
  assert.strictEqual(buffer.length, 5, 'buffer should have 5 items');

  assert.strictEqual(buffer[0].type, 'log');
  assert.strictEqual(buffer[0].message, 'sample log message');
  assert.ok(typeof buffer[0].origin === 'string' && buffer[0].origin.length > 0);

  assert.strictEqual(buffer[1].type, 'info');
  assert.strictEqual(buffer[1].message, 'sample info message');

  assert.strictEqual(buffer[2].type, 'warn');
  assert.strictEqual(buffer[2].message, 'sample warn message');

  assert.strictEqual(buffer[3].type, 'error');
  assert.strictEqual(buffer[3].message, 'sample error message');

  assert.strictEqual(buffer[4].type, 'debug');
  assert.strictEqual(buffer[4].message, 'sample debug message');
}

function testBufferedConsoleStaticWrite() {
  const targetBuffer = [];
  writeToBuffer(targetBuffer, 'warn', 'direct buffer append message', 1);

  assert.strictEqual(targetBuffer.length, 1);
  assert.strictEqual(targetBuffer[0].type, 'warn');
  assert.strictEqual(targetBuffer[0].message, 'direct buffer append message');
  assert.ok(typeof targetBuffer[0].origin === 'string');
}

function testBufferedConsoleGrouping() {
  const c = createBufferedConsole();
  c.group('Suite 1');
  c.log('test step 1');
  c.groupCollapsed('Nested Step');
  c.log('inner detail');
  c.groupEnd();
  c.log('test step 2');
  c.groupEnd();

  const buffer = c.getBuffer();
  assert.strictEqual(buffer.length, 5);

  assert.strictEqual(buffer[0].type, 'group');
  assert.strictEqual(buffer[0].message, '  Suite 1');

  assert.strictEqual(buffer[1].type, 'log');
  assert.strictEqual(buffer[1].message, '  test step 1');

  assert.strictEqual(buffer[2].type, 'groupCollapsed');
  assert.strictEqual(buffer[2].message, '    Nested Step');

  assert.strictEqual(buffer[3].type, 'log');
  assert.strictEqual(buffer[3].message, '    inner detail');

  assert.strictEqual(buffer[4].type, 'log');
  assert.strictEqual(buffer[4].message, '  test step 2');
}

function testBufferedConsoleTimingAndCounting() {
  const c = createBufferedConsole();
  c.count('invocations');
  c.count('invocations');
  c.countReset('invocations');
  c.count('invocations');

  c.time('benchmark');
  c.timeEnd('benchmark');

  const buffer = c.getBuffer();
  assert.strictEqual(buffer.length, 4);

  assert.strictEqual(buffer[0].type, 'count');
  assert.strictEqual(buffer[0].message, 'invocations: 1');

  assert.strictEqual(buffer[1].type, 'count');
  assert.strictEqual(buffer[1].message, 'invocations: 2');

  assert.strictEqual(buffer[2].type, 'count');
  assert.strictEqual(buffer[2].message, 'invocations: 1');

  assert.strictEqual(buffer[3].type, 'time');
  assert.match(buffer[3].message, /^benchmark: \d+(\.\d+)?\s*(ms|s)$/);
}

function testBufferedConsoleAssertion() {
  const c = createBufferedConsole();
  c.assert(true, 'truthy condition must not produce buffer entry');
  assert.strictEqual(c.getBuffer(), undefined);

  c.assert(false, 'condition failed as expected');
  const buffer = c.getBuffer();
  assert.strictEqual(buffer.length, 1);
  assert.strictEqual(buffer[0].type, 'assert');
  assert.match(buffer[0].message, /AssertionError.*condition failed as expected/);
}

function testBufferedConsoleDir() {
  const c = createBufferedConsole();
  c.dir({ key: 'value', number: 123 });

  const buffer = c.getBuffer();
  assert.strictEqual(buffer.length, 1);
  assert.strictEqual(buffer[0].type, 'dir');
  assert.match(buffer[0].message, /key:\s*'value'/);
}

function testCaptureConsoleLogs() {
  const { result, buffer } = captureConsoleLogs((localConsole) => {
    console.log('intercepted standard log');
    console.error('intercepted standard error');
    return 42;
  });

  assert.strictEqual(result, 42);
  assert.strictEqual(buffer.length, 2);
  assert.strictEqual(buffer[0].type, 'log');
  assert.strictEqual(buffer[0].message, 'intercepted standard log');
  assert.strictEqual(buffer[1].type, 'error');
  assert.strictEqual(buffer[1].message, 'intercepted standard error');
}

function main() {
  testBufferedConsoleBasicLogging();
  testBufferedConsoleStaticWrite();
  testBufferedConsoleGrouping();
  testBufferedConsoleTimingAndCounting();
  testBufferedConsoleAssertion();
  testBufferedConsoleDir();
  testCaptureConsoleLogs();
  console.log('All BufferedConsole contract tests passed successfully.');
}

main();

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