CodeSampleX

示例

@jest/console 29.7.0: CustomConsole

已验证示例 — npm @jest/console 29.7.0: CustomConsole. contract 在 node 22 · linux alpine/x64 · docker 上运行并通过： CustomConsole writes standard log, info, and debug…

sha256:62a6fc04129fbe8d2d5467cc0b83871faa92c96bd69716e8934955ae44cdc600

本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。 提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。 MIT-0

执行证据

声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。

证据依据
签名契约通过
验证回执
1
构建过它的签名密钥
1
声明的环境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

验证运行环境

环境 契约 阶段 运行日期
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

案例

HOW
目标
verify @jest/console.CustomConsole in pkg:npm/%40jest/console@29.7.0
包
符号
  • @jest/console.CustomConsole
环境
node 22.23.2
创建时间
2026-08-27T18:00:06Z

契约

  1. CustomConsole writes standard log, info, and debug messages to the provided stdout Writable stream
  2. CustomConsole writes warn and error messages to the provided stderr Writable stream
  3. CustomConsole applies custom formatBuffer transformer function to log and error output before writing
  4. CustomConsole manages group indentation levels with group and resets indentation with groupEnd
  5. CustomConsole tracks labeled invocation counts with count and resets them with countReset
  6. CustomConsole tracks labeled elapsed durations with time, timeEnd, and timeLog
  7. CustomConsole assert writes formatted AssertionError to stderr on falsy condition and produces no output on truthy condition
  8. CustomConsole getBuffer returns undefined
  9. captureCustomConsole intercepts and collects stdout and stderr output during function execution

文件

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

下载源代码构件 (tar.gz)

源代码

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.CustomConsole 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.CustomConsole
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:sha256:94bff54f112e4ff01d330b9d1dacd85f706a0b7adf7d4c676a13b77d183e0805","constraints":{"executionContext":"node"},"contract":["CustomConsole writes standard log, info, and debug messages to the provided stdout Writable stream","CustomConsole writes warn and error messages to the provided stderr Writable stream","CustomConsole applies custom formatBuffer transformer function to log and error output before writing","CustomConsole manages group indentation levels with group and resets indentation with groupEnd","CustomConsole tracks labeled invocation counts with count and resets them with countReset","CustomConsole tracks labeled elapsed durations with time, timeEnd, and timeLog","CustomConsole assert writes formatted AssertionError to stderr on falsy condition and produces no output on truthy condition","CustomConsole getBuffer returns undefined","captureCustomConsole intercepts and collects stdout and stderr output during function execution"],"goal":"verify @jest/console.CustomConsole in pkg:npm/%40jest/console@29.7.0","kind":"HOW","packages":["pkg:npm/%40jest/console@29.7.0"],"schemaVersion":1,"symbols":["@jest/console.CustomConsole"]},"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.CustomConsole"],"verifierAdapter":"node-typescript@1"}
index.js
'use strict';

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

/**
 * Creates an in-memory Writable stream to capture console output.
 * @returns {Writable & { getContent: () => string, clear: () => void }}
 */
function createMemoryStream() {
  const chunks = [];
  const stream = new Writable({
    write(chunk, encoding, callback) {
      chunks.push(chunk.toString());
      callback();
    }
  });
  stream.getContent = () => chunks.join('');
  stream.clear = () => {
    chunks.length = 0;
  };
  return stream;
}

/**
 * Creates a CustomConsole instance with specified stdout, stderr, and optional formatter.
 * @param {Writable} stdout - Standard output stream.
 * @param {Writable} stderr - Standard error stream.
 * @param {Function} [formatBuffer] - Optional formatting function (type, message) => string.
 * @returns {CustomConsole} A new CustomConsole instance.
 */
function createCustomConsole(stdout, stderr, formatBuffer) {
  return new CustomConsole(stdout, stderr, formatBuffer);
}

/**
 * Executes a function with captured stdout and stderr via CustomConsole.
 * @param {Function} fn - Function receiving (customConsole, stdoutStream, stderrStream).
 * @param {Function} [formatBuffer] - Optional log formatter.
 * @returns {{ result: any, stdout: string, stderr: string }}
 */
function captureCustomConsole(fn, formatBuffer) {
  const stdout = createMemoryStream();
  const stderr = createMemoryStream();
  const customConsole = createCustomConsole(stdout, stderr, formatBuffer);
  const result = fn(customConsole, stdout, stderr);
  return {
    result,
    stdout: stdout.getContent(),
    stderr: stderr.getContent()
  };
}

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

function testStandardLoggingToStdout() {
  const stdout = createMemoryStream();
  const stderr = createMemoryStream();
  const c = createCustomConsole(stdout, stderr);

  c.log('sample log %s', 'message');
  c.info('sample info message');
  c.debug('sample debug message');

  const out = stdout.getContent();
  const err = stderr.getContent();

  assert.ok(out.includes('sample log message\n'), 'stdout should contain formatted log message');
  assert.ok(out.includes('sample info message\n'), 'stdout should contain info message');
  assert.ok(out.includes('sample debug message\n'), 'stdout should contain debug message');
  assert.strictEqual(err, '', 'stderr should be empty for standard log calls');
}

function testErrorLoggingToStderr() {
  const stdout = createMemoryStream();
  const stderr = createMemoryStream();
  const c = createCustomConsole(stdout, stderr);

  c.warn('sample warn %s', 'warning');
  c.error('sample error message');

  const out = stdout.getContent();
  const err = stderr.getContent();

  assert.strictEqual(out, '', 'stdout should be empty for warn/error calls');
  assert.ok(err.includes('sample warn warning\n'), 'stderr should contain warn message');
  assert.ok(err.includes('sample error message\n'), 'stderr should contain error message');
}

function testCustomFormatBuffer() {
  const stdout = createMemoryStream();
  const stderr = createMemoryStream();
  const customFormatter = (type, message) => `[${type.toUpperCase()}] ${message}`;
  const c = createCustomConsole(stdout, stderr, customFormatter);

  c.log('formatted log line');
  c.error('formatted error line');

  assert.strictEqual(stdout.getContent(), '[LOG] formatted log line\n');
  assert.strictEqual(stderr.getContent(), '[ERROR] formatted error line\n');
}

function testGroupIndentation() {
  const stdout = createMemoryStream();
  const stderr = createMemoryStream();
  const c = createCustomConsole(stdout, stderr);

  c.group('Suite A');
  c.log('nested item 1');
  c.groupCollapsed('SubSuite B');
  c.log('deep item');
  c.groupEnd();
  c.log('nested item 2');
  c.groupEnd();
  c.log('root item');

  const out = stdout.getContent();
  assert.ok(out.includes('Suite A'));
  assert.ok(out.includes('  nested item 1'));
  assert.ok(out.includes('SubSuite B'));
  assert.ok(out.includes('    deep item'));
  assert.ok(out.includes('  nested item 2'));
  assert.ok(out.includes('root item'));
}

function testCountersAndTimers() {
  const stdout = createMemoryStream();
  const stderr = createMemoryStream();
  const c = createCustomConsole(stdout, stderr);

  c.count('hits');
  c.count('hits');
  c.countReset('hits');
  c.count('hits');

  const out = stdout.getContent();
  assert.ok(out.includes('hits: 1\n'));
  assert.ok(out.includes('hits: 2\n'));

  stdout.clear();
  c.time('perf-test');
  c.timeLog('perf-test', 'interim');
  c.timeEnd('perf-test');

  const timerOut = stdout.getContent();
  assert.match(timerOut, /perf-test: \d+(\.\d+)?\s*(ms|s) interim/);
  assert.match(timerOut, /perf-test: \d+(\.\d+)?\s*(ms|s)/);
}

function testAssertionHandling() {
  const stdout = createMemoryStream();
  const stderr = createMemoryStream();
  const c = createCustomConsole(stdout, stderr);

  // Truthy condition must not output anything
  c.assert(true, 'truthy condition must not write to stderr');
  assert.strictEqual(stderr.getContent(), '');

  // Falsy condition logs AssertionError to stderr without unhandled throw
  c.assert(false, 'contract assertion failed check');
  const err = stderr.getContent();
  assert.ok(err.includes('AssertionError'), 'stderr should log AssertionError');
  assert.ok(err.includes('contract assertion failed check'), 'stderr should include message');
  assert.strictEqual(stdout.getContent(), '', 'stdout should remain empty');
}

function testGetBufferReturnsUndefined() {
  const stdout = createMemoryStream();
  const stderr = createMemoryStream();
  const c = createCustomConsole(stdout, stderr);
  c.log('something');
  assert.strictEqual(c.getBuffer(), undefined, 'CustomConsole.getBuffer must return undefined');
}

function testCaptureCustomConsoleHelper() {
  const { result, stdout, stderr } = captureCustomConsole((c) => {
    c.log('captured log');
    c.warn('captured warning');
    return 123;
  });

  assert.strictEqual(result, 123);
  assert.strictEqual(stdout, 'captured log\n');
  assert.strictEqual(stderr, 'captured warning\n');
}

function main() {
  testStandardLoggingToStdout();
  testErrorLoggingToStderr();
  testCustomFormatBuffer();
  testGroupIndentation();
  testCountersAndTimers();
  testAssertionHandling();
  testGetBufferReturnsUndefined();
  testCaptureCustomConsoleHelper();
  console.log('All CustomConsole contract tests passed successfully.');
}

main();

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