CodeSampleX

サンプル

@jest/console 30.4.1: NullConsole

検証済みサンプル — npm @jest/console 30.4.1: NullConsole. node 22 · linux debian/x64 · docker で contract を実行し、成功しました: NullConsole constructor requires writable…

sha256:2efe65ec27e092417cb3e9e41a5c464b51f394218671858989a135a3e9fe082a

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
1
ビルドした署名鍵
1
宣言された環境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

検証実行環境

環境 コントラクト ステージ 実行日
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

ケース

HOW
ゴール
verify @jest/console.NullConsole in pkg:npm/%40jest/console@30.4.1
パッケージ
シンボル
  • @jest/console.NullConsole
環境
node 22.23.2
作成日
2026-09-06T03:13:30Z

コントラクト

  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

ファイル

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

ソースアーティファクトをダウンロード (tar.gz)

ソース

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
{
  "name": "sample-jest-console-null",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-jest-console-null",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@jest/console": "30.4.1"
      }
    },
    "node_modules/@babel/code-frame": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.7.tgz",
      "integrity": "sha512-Aup7aUOfpbAUg2ROOJN6Iw5f9DMBlzu0mIkm/malLQFN/YQgO48wCj0Kxa3sEHJvPVFg7siR+qRInwXd2qhQKw==",
      "license": "MIT",
      "dependencies": {
        "@babel/helper-validator-identifier": "^7.29.7",
        "js-tokens": "^4.0.0",
        "picocolors": "^1.1.1"
      },
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/helper-validator-identifier": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.29.7.tgz",
      "integrity": "sha512-qehxGkRj55h/ff8EMaJ+cYhyaKlHIxqYDn682wQD7RNp9UujOQsHog2uS0r2vzr4pW+sXf90NeeayjcNaX3fFg==",
      "license": "MIT",
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@jest/console": {
      "version": "30.4.1",
      "resolved": "https://registry.npmjs.org/@jest/console/-/console-30.4.1.tgz",
      "integrity": "sha512-v3bhyxUh9Hgmo5p6hAOXe14/R3ZxZDOsvHleh4B07z3m/x4/ngPUXEm9XwK4sF4u+f+P2ORb0Ge+MgpaqRMVDA==",
      "license": "MIT",
      "dependencies": {
        "@jest/types": "30.4.1",
        "@types/node": "*",
        "chalk": "^4.1.2",
        "jest-message-util": "30.4.1",
        "jest-util": "30.4.1",
        "slash": "^3.0.0"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/@jest/pattern": {
      "version": "30.4.0",
      "resolved": "https://registry.npmjs.org/@jest/pattern/-/pattern-30.4.0.tgz",
      "integrity": "sha512-RAWn3+f9u8BsHijKJ71uHcFp6vmyEt6VvoWXkl6hKF3qVIuWNmudVjg12DlBPGup/frIl5UcUlH5HfEuvHpEXg==",
      "license": "MIT",
      "dependencies": {
        "@types/node": "*",
        "jest-regex-util": "30.4.0"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/@jest/schemas": {
      "version": "30.4.1",
      "resolved": "https://registry.npmjs.org/@jest/schemas/-/schemas-30.4.1.tgz",
      "integrity": "sha512-i6b4qw5qnP8c5FEeBJg/uZQ4ddrkN6Ca8qISJh0pr7a5hfn3h3v5x60BEbOC7OYAGZNMs1LfFLwnW2CuK8F57Q==",
      "license": "MIT",
      "dependencies": {
        "@sinclair/typebox": "^0.34.0"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/@jest/types": {
      "version": "30.4.1",
      "resolved": "https://registry.npmjs.org/@jest/types/-/types-30.4.1.tgz",
      "integrity": "sha512-f1x/vJXIfjOlEmejYpbkbgw1gOqpPECwMvMEtBqe47j7H2Hg8h8w3o3ikhSXq3MI15kg+oQ0exWO0uCtTNJLoQ==",
      "license": "MIT",
      "dependencies": {
        "@jest/pattern": "30.4.0",
        "@jest/schemas": "30.4.1",
        "@types/istanbul-lib-coverage": "^2.0.6",
        "@types/istanbul-reports": "^3.0.4",
        "@types/node": "*",
        "@types/yargs": "^17.0.33",
        "chalk": "^4.1.2"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/@sinclair/typebox": {
      "version": "0.34.52",
      "resolved": "https://registry.npmjs.org/@sinclair/typebox/-/typebox-0.34.52.tgz",
      "integrity": "sha512-XiMQh7qqVlxZzcVD+kkGMNGMzcTrDMLWI7S4x7z1MkCkbDPrekpZXEUK0eZqZFMuHQg2a2DZOcDIh9o5v3Gonw==",
      "license": "MIT"
    },
    "node_modules/@types/istanbul-lib-coverage": {
      "version": "2.0.6",
      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.6.tgz",
      "integrity": "sha512-2QF/t/auWm0lsy8XtKVPG19v3sSOQlJe/YHZgfjb/KBBHOGSV+J2q/S671rcq9uTBrLAXmZpqJiaQbMT+zNU1w==",
      "license": "MIT"
    },
    "node_modules/@types/istanbul-lib-report": {
      "version": "3.0.3",
      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-report/-/istanbul-lib-report-3.0.3.tgz",
      "integrity": "sha512-NQn7AHQnk/RSLOxrBbGyJM/aVQ+pjj5HCgasFxc0K/KhoATfQ/47AyUl15I2yBUpihjmas+a+VJBOqecrFH+uA==",
      "license": "MIT",
      "dependencies": {
        "@types/istanbul-lib-coverage": "*"
      }
    },
    "node_modules/@types/istanbul-reports": {
      "version": "3.0.4",
      "resolved": "https://registry.npmjs.org/@types/istanbul-reports/-/istanbul-reports-3.0.4.tgz",
      "integrity": "sha512-pk2B1NWalF9toCRu6gjBzR69syFjP4Od8WRAX+0mmf9lAjCRicLOWc+ZrxZHx/0XRjotgkF9t6iaMJ+aXcOdZQ==",
      "license": "MIT",
      "dependencies": {
        "@types/istanbul-lib-report": "*"
      }
    },
    "node_modules/@types/node": {
      "version": "26.4.1",
      "resolved": "https://registry.npmjs.org/@types/node/-/node-26.4.1.tgz",
      "integrity": "sha512-k97ENvZWtvA6yqz5/FS6a7duDgOPEeOQOc2iKS/nY6mX6qJUKtLnWzQS+Xj6tXweyj6ZcTAK2Qecetnvi9nCLA==",
      "license": "MIT",
      "dependencies": {
        "undici-types": "~8.3.0"
      }
    },
    "node_modules/@types/stack-utils": {
      "version": "2.0.3",
      "resolved": "https://registry.npmjs.org/@types/stack-utils/-/stack-utils-2.0.3.tgz",
      "integrity": "sha512-9aEbYZ3TbYMznPdcdr3SmIrLXwC/AKZXQeCf9Pgao5CKb8CyHuEX5jzWPTkvregvhRJHcpRO6BFoGW9ycaOkYw==",
      "license": "MIT"
    },
    "node_modules/@types/yargs": {
      "version": "17.0.35",
      "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-17.0.35.tgz",
      "integrity": "sha512-qUHkeCyQFxMXg79wQfTtfndEC+N9ZZg76HJftDJp+qH2tV7Gj4OJi7l+PiWwJ+pWtW8GwSmqsDj/oymhrTWXjg==",
      "license": "MIT",
      "dependencies": {
        "@types/yargs-parser": "*"
      }
    },
    "node_modules/@types/yargs-parser": {
      "version": "21.0.3",
      "resolved": "https://registry.npmjs.org/@types/yargs-parser/-/yargs-parser-21.0.3.tgz",
      "integrity": "sha512-I4q9QU9MQv4oEOz4tAHJtNz1cwuLxn2F3xcc2iV5WdqLPpUnj30aUuxt1mAxYTG+oe8CZMV/+6rU4S4gRDzqtQ==",
      "license": "MIT"
    },
    "node_modules/ansi-styles": {
      "version": "4.3.0",
      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
      "license": "MIT",
      "dependencies": {
        "color-convert": "^2.0.1"
      },
      "engines": {
        "node": ">=8"
      },
      "funding": {
        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
      }
    },
    "node_modules/chalk": {
      "version": "4.1.2",
      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
      "license": "MIT",
      "dependencies": {
        "ansi-styles": "^4.1.0",
        "supports-color": "^7.1.0"
      },
      "engines": {
        "node": ">=10"
      },
      "funding": {
        "url": "https://github.com/chalk/chalk?sponsor=1"
      }
    },
    "node_modules/ci-info": {
      "version": "4.4.0",
      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-4.4.0.tgz",
      "integrity": "sha512-77PSwercCZU2Fc4sX94eF8k8Pxte6JAwL4/ICZLFjJLqegs7kCuAsqqj/70NQF6TvDpgFjkubQB2FW2ZZddvQg==",
      "funding": [
        {
          "type": "github",
          "url": "https://github.com/sponsors/sibiraj-s"
        }
      ],
      "license": "MIT",
      "engines": {
        "node": ">=8"
      }
    },
    "node_modules/color-convert": {
      "version": "2.0.1",
      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
      "license": "MIT",
      "dependencies": {
        "color-name": "~1.1.4"
      },
      "engines": {
        "node": ">=7.0.0"
      }
    },
    "node_modules/color-name": {
      "version": "1.1.4",
      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
      "license": "MIT"
    },
    "node_modules/escape-string-regexp": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-2.0.0.tgz",
      "integrity": "sha512-UpzcLCXolUWcNu5HtVMHYdXJjArjsF9C0aNnquZYY4uW/Vu0miy5YoWvbV345HauVvcAUnpRuhMMcqTcGOY2+w==",
      "license": "MIT",
      "engines": {
        "node": ">=8"
      }
    },
    "node_modules/graceful-fs": {
      "version": "4.2.11",
      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.11.tgz",
      "integrity": "sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==",
      "license": "ISC"
    },
    "node_modules/has-flag": {
      "version": "4.0.0",
      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
      "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
      "license": "MIT",
      "engines": {
        "node": ">=8"
      }
    },
    "node_modules/jest-message-util": {
      "version": "30.4.1",
      "resolved": "https://registry.npmjs.org/jest-message-util/-/jest-message-util-30.4.1.tgz",
      "integrity": "sha512-kwCKIvq0MCW1HzLoGola9Te6JUdzgV0loyKJ3Qghrkz9i5/RRIHsL95BMQc2HBBhlBKC4j22K9p11TGHH8RBpQ==",
      "license": "MIT",
      "dependencies": {
        "@babel/code-frame": "^7.27.1",
        "@jest/types": "30.4.1",
        "@types/stack-utils": "^2.0.3",
        "chalk": "^4.1.2",
        "graceful-fs": "^4.2.11",
        "jest-util": "30.4.1",
        "picomatch": "^4.0.3",
        "pretty-format": "30.4.1",
        "slash": "^3.0.0",
        "stack-utils": "^2.0.6"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/jest-regex-util": {
      "version": "30.4.0",
      "resolved": "https://registry.npmjs.org/jest-regex-util/-/jest-regex-util-30.4.0.tgz",
      "integrity": "sha512-mWlvLviKIgIQ8VCuM1xRdD0TWp3zlzionlmDBjuXVBs+VkmXq6FgW9T4Emr7oGz/Rk6feDCGyiugolcQEyp3mg==",
      "license": "MIT",
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/jest-util": {
      "version": "30.4.1",
      "resolved": "https://registry.npmjs.org/jest-util/-/jest-util-30.4.1.tgz",
      "integrity": "sha512-vjQb1sACEiv13DKJMDToJpzVW0joCsIQrmbg0fi7CyOOt+g9jTuQl2A216pWRBYhOVt53XbL/2LbMKg1BECWOw==",
      "license": "MIT",
      "dependencies": {
        "@jest/types": "30.4.1",
        "@types/node": "*",
        "chalk": "^4.1.2",
        "ci-info": "^4.2.0",
        "graceful-fs": "^4.2.11",
        "picomatch": "^4.0.3"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/js-tokens": {
      "version": "4.0.0",
      "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
      "integrity": "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ==",
      "license": "MIT"
    },
    "node_modules/picocolors": {
      "version": "1.1.1",
      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
      "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==",
      "license": "ISC"
    },
    "node_modules/picomatch": {
      "version": "4.0.7",
      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.7.tgz",
      "integrity": "sha512-qcJu88Q2IWqJsDD529JKMdwGm/dvInW4HvQnRwiH9JtihJvzGOscDtHE3x1pBKeUOTysQ8kVmLnJ2kJu7yhcGA==",
      "license": "MIT",
      "engines": {
        "node": ">=12"
      },
      "funding": {
        "url": "https://github.com/sponsors/jonschlinkert"
      }
    },
    "node_modules/pretty-format": {
      "version": "30.4.1",
      "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-30.4.1.tgz",
      "integrity": "sha512-K6KiKMHTL4jjX4u3Kir2EW07nRfcqVTXIImx50wbjHQTcZPgg+gjVeNTIT3l3L1Rd4UefxfogquC9J37SoFyyw==",
      "license": "MIT",
      "dependencies": {
        "@jest/schemas": "30.4.1",
        "ansi-styles": "^5.2.0",
        "react-is-18": "npm:react-is@^18.3.1",
        "react-is-19": "npm:react-is@^19.2.5"
      },
      "engines": {
        "node": "^18.14.0 || ^20.0.0 || ^22.0.0 || >=24.0.0"
      }
    },
    "node_modules/pretty-format/node_modules/ansi-styles": {
      "version": "5.2.0",
      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
      "integrity": "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==",
      "license": "MIT",
      "engines": {
        "node": ">=10"
      },
      "funding": {
        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
      }
    },
    "node_modules/react-is-18": {
      "name": "react-is",
      "version": "18.3.1",
      "resolved": "https://registry.npmjs.org/react-is/-/react-is-18.3.1.tgz",
      "integrity": "sha512-/LLMVyas0ljjAtoYiPqYiL8VWXzUUdThrmU5+n20DZv+a+ClRoevUzw5JxU+Ieh5/c87ytoTBV9G1FiKfNJdmg==",
      "license": "MIT"
    },
    "node_modules/react-is-19": {
      "name": "react-is",
      "version": "19.2.8",
      "resolved": "https://registry.npmjs.org/react-is/-/react-is-19.2.8.tgz",
      "integrity": "sha512-s5un28nYxKJw5gvUHyW5PCC28CvBqLu9r3cWgzHT4Vo/5fqqkFcdRYsGcKf50WMPpjjFZS5d76fn3YCo2njKwQ==",
      "license": "MIT"
    },
    "node_modules/slash": {
      "version": "3.0.0",
      "resolved": "https://registry.npmjs.org/slash/-/slash-3.0.0.tgz",
      "integrity": "sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q==",
      "license": "MIT",
      "engines": {
        "node": ">=8"
      }
    },
    "node_modules/stack-utils": {
      "version": "2.0.6",
      "resolved": "https://registry.npmjs.org/stack-utils/-/stack-utils-2.0.6.tgz",
      "integrity": "sha512-XlkWvfIm6RmsWtNJx+uqtKLS8eqFbxUg0ZzLXqY0caEy9l7hruX8IpiDnjsLavoBgqCCR71TqWO8MaXYheJ3RQ==",
      "license": "MIT",
      "dependencies": {
        "escape-string-regexp": "^2.0.0"
      },
      "engines": {
        "node": ">=10"
      }
    },
    "node_modules/supports-color": {
      "version": "7.2.0",
      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
      "license": "MIT",
      "dependencies": {
        "has-flag": "^4.0.0"
      },
      "engines": {
        "node": ">=8"
      }
    },
    "node_modules/undici-types": {
      "version": "8.3.0",
      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-8.3.0.tgz",
      "integrity": "sha512-j375ScV60dom+YkPFIfTLcOiPxkN/buHz5GobjLhixFuANaNs3C9l4GmrWqejgXWJ7BbJcFYpTEUkS1Ge8bpZQ==",
      "license": "MIT"
    }
  }
}
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();

オリジンシーダー

匿名