CodeSampleX

Ejemplo

@jest/console 30.4.1: getConsoleOutput

Muestra verificada para npm @jest/console 30.4.1: getConsoleOutput. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:d32572bc1ed84487b6bd2493dd722c5de5ebf35015a73e1ecfa4f42da69c87ef

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 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.getConsoleOutput in pkg:npm/%40jest/console@30.4.1
Paquetes
Símbolos
  • @jest/console.getConsoleOutput
Creado
2026-09-06T04:42:36Z

Contrato

  1. BufferedConsole collects log, warn, error entries into a ConsoleBuffer
  2. getConsoleOutput(buffer, config, globalConfig) formats console buffer entries to formatted string output
  3. getConsoleOutput with empty buffer produces a single newline string

Archivos

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

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.getConsoleOutput 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.getConsoleOutput

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:sha256:0a9dc214b4925fcd17fefa7570413c1bfb84426db4de7be329b0db3dae73b504","contract":["BufferedConsole collects log, warn, error entries into a ConsoleBuffer","getConsoleOutput(buffer, config, globalConfig) formats console buffer entries to formatted string output","getConsoleOutput with empty buffer produces a single newline string"],"goal":"verify @jest/console.getConsoleOutput in pkg:npm/%40jest/console@30.4.1","kind":"HOW","packages":["pkg:npm/%40jest/console@30.4.1"],"schemaVersion":1,"symbols":["@jest/console.getConsoleOutput"]},"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/%40jest/console@30.4.1"],"schemaVersion":1,"subject":"pkg:npm/%40jest/console@30.4.1","symbols":["@jest/console.getConsoleOutput"],"verifierAdapter":"node-typescript@1"}
index.mjs
import { BufferedConsole, getConsoleOutput } from '@jest/console';

export function formatLogs(entries, options = {}) {
  const buffer = entries.map(entry => ({
    type: entry.type || 'log',
    message: entry.message,
    origin: entry.origin || ''
  }));

  const config = {
    rootDir: options.rootDir || process.cwd()
  };

  const globalConfig = {
    verbose: options.verbose ?? true,
    noStackTrace: options.noStackTrace ?? true
  };

  return getConsoleOutput(buffer, config, globalConfig);
}

export { BufferedConsole, getConsoleOutput };
package-lock.json
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      "license": "MIT",
      "dependencies": {
        "escape-string-regexp": "^2.0.0"
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      "engines": {
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    "node_modules/supports-color": {
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      "license": "MIT",
      "dependencies": {
        "has-flag": "^4.0.0"
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      "license": "MIT"
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}
package.json
{
  "name": "sample-jest-console",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "@jest/console": "30.4.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @jest/console.getConsoleOutput in pkg:npm/%40jest/console@30.4.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40jest/console@30.4.1"
  ],
  "symbols": [
    "@jest/console.getConsoleOutput"
  ]
}
test/contract.mjs
import assert from 'node:assert';
import { BufferedConsole, getConsoleOutput } from '@jest/console';

// Verify BufferedConsole collects log entries
const bufferedConsole = new BufferedConsole();
bufferedConsole.log('Application started');
bufferedConsole.warn('Deprecated configuration encountered');
bufferedConsole.error('Connection timed out');

const buffer = bufferedConsole.getBuffer();
assert.ok(Array.isArray(buffer), 'buffer should be an array');
assert.strictEqual(buffer.length, 3, 'buffer should contain 3 log entries');

// Configuration for stack trace and formatting
const config = {
  rootDir: process.cwd()
};

const globalConfig = {
  verbose: true,
  noStackTrace: true
};

// getConsoleOutput formats the buffer into a string representation
const output = getConsoleOutput(buffer, config, globalConfig);

assert.strictEqual(typeof output, 'string', 'output should be a string');
assert.ok(output.includes('Application started'), 'output must include log message');
assert.ok(output.includes('console.log'), 'output must include console.log label');
assert.ok(output.includes('Deprecated configuration encountered'), 'output must include warning message');
assert.ok(output.includes('console.warn'), 'output must include console.warn label');
assert.ok(output.includes('Connection timed out'), 'output must include error message');
assert.ok(output.includes('console.error'), 'output must include console.error label');

// Verify getConsoleOutput with empty buffer
const emptyOutput = getConsoleOutput([], config, globalConfig);
assert.strictEqual(emptyOutput, '\n', 'empty buffer produces a single newline');

console.log('Contract test passed successfully.');

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