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@jest/environment 29.7.0: Jest environment interface and context configuration

検証済みサンプル — npm @jest/environment 29.7.0: Jest environment interface and context configuration. node 22 · linux alpine/x64 · docker で contract を実行し、成功しました.

sha256:032e323fb27c06104841bef1df568eb012c2ee031ae22d9bee4db112f5b03c12

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 alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…		 2026-08-23

ケース

HOW
ゴール
Jest environment interface and context configuration
パッケージ
シンボル
  • JestEnvironment
環境
node 22.23.2
作成日
2026-08-23T16:17:14Z

コントラクト

  1. @jest/environment package.json declares type definitions entry point ./build/index.d.ts and version 29.7.0
  2. @jest/environment index.d.ts declares JestEnvironment class with constructor, global, fakeTimers, moduleMocker, getVmContext, setup, and teardown methods
  3. @jest/environment index.d.ts declares JestEnvironmentConfig interface containing projectConfig and globalConfig
  4. @jest/environment index.d.ts declares EnvironmentContext type containing console, docblockPragmas, and testPath
  5. @jest/environment index.d.ts declares Jest interface with fake timer controls, module mocking, and test retries
  6. @jest/environment index.d.ts declares ModuleWrapper and JestImportMeta type definitions
  7. CustomTestEnvironment initializes with JestEnvironmentConfig and EnvironmentContext and exposes global state and lifecycle hooks
  8. CustomTestEnvironment setup and teardown manage environment lifecycle and handleTestEvent processes test runner events

ファイル

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

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: Jest environment interface and context configuration
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40jest/environment@29.7.0
Demonstrate these symbols/APIs:
  - JestEnvironment
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:sha256:6575b2204e50898818e0ebdab56529a13d6a81d6898134ffa6b982b645548588","constraints":{"executionContext":"node"},"contract":["@jest/environment package.json declares type definitions entry point ./build/index.d.ts and version 29.7.0","@jest/environment index.d.ts declares JestEnvironment class with constructor, global, fakeTimers, moduleMocker, getVmContext, setup, and teardown methods","@jest/environment index.d.ts declares JestEnvironmentConfig interface containing projectConfig and globalConfig","@jest/environment index.d.ts declares EnvironmentContext type containing console, docblockPragmas, and testPath","@jest/environment index.d.ts declares Jest interface with fake timer controls, module mocking, and test retries","@jest/environment index.d.ts declares ModuleWrapper and JestImportMeta type definitions","CustomTestEnvironment initializes with JestEnvironmentConfig and EnvironmentContext and exposes global state and lifecycle hooks","CustomTestEnvironment setup and teardown manage environment lifecycle and handleTestEvent processes test runner events"],"goal":"Jest environment interface and context configuration","kind":"HOW","packages":["pkg:npm/%40jest/environment@29.7.0"],"schemaVersion":1,"symbols":["JestEnvironment"]},"contractCommand":["node","test/contract.mjs"],"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/environment@29.7.0"],"schemaVersion":1,"subject":"pkg:npm/%40jest/environment@29.7.0","symbols":["JestEnvironment"],"verifierAdapter":"node-typescript@1"}
index.mjs
/**
 * Custom Jest Environment conforming to @jest/environment JestEnvironment interface
 */
export class CustomTestEnvironment {
  constructor(config, context) {
    this.config = config;
    this.context = context;
    this.global = {
      ...globalThis,
      testPath: context.testPath,
      customGlobalVar: 'custom_jest_environment_active',
    };
    this.fakeTimers = null;
    this.fakeTimersModern = null;
    this.moduleMocker = null;
    this._isTornDown = false;
  }

  async setup() {
    this.global.__ENVIRONMENT_READY__ = true;
  }

  async teardown() {
    this._isTornDown = true;
    this.global.__ENVIRONMENT_READY__ = false;
  }

  getVmContext() {
    return null;
  }

  handleTestEvent(event, state) {
    if (event.name === 'test_start') {
      this.global.__LAST_TEST_STARTED__ = event.test.name;
    }
  }

  exportConditions() {
    return ['node', 'jest-environment'];
  }
}

export function createEnvironmentContext(testPath, docblockPragmas = {}, customConsole = console) {
  return {
    testPath,
    docblockPragmas,
    console: customConsole,
  };
}

export function createJestEnvironmentConfig(projectConfigOverrides = {}, globalConfigOverrides = {}) {
  return {
    projectConfig: {
      rootDir: '/root',
      testEnvironment: 'node',
      ...projectConfigOverrides,
    },
    globalConfig: {
      rootDir: '/root',
      maxWorkers: 1,
      ...globalConfigOverrides,
    },
  };
}
package-lock.json
{
  "name": "sample-jest-environment",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-jest-environment",
      "version": "1.0.0",
      "license": "MIT-0",
      "dependencies": {
        "@jest/environment": "29.7.0"
      }
    },
    "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",
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    "node_modules/@jest/environment": {
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      "resolved": "https://registry.npmjs.org/@jest/environment/-/environment-29.7.0.tgz",
      "integrity": "sha512-aQIfHDq33ExsN4jP1NWGXhxgQ/wixs60gDiKO+XVMd8Mn0NWPWgc34ZQDTb2jKaUWQ7MuwoitXAsN2XVXNMpAw==",
      "license": "MIT",
      "dependencies": {
        "@jest/fake-timers": "^29.7.0",
        "@jest/types": "^29.6.3",
        "@types/node": "*",
        "jest-mock": "^29.7.0"
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package.json
{
  "name": "sample-jest-environment",
  "version": "1.0.0",
  "type": "module",
  "description": "Clean-room verification sample for @jest/environment",
  "license": "MIT-0",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@jest/environment": "29.7.0"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "Jest environment interface and context configuration",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40jest/environment@29.7.0"
  ],
  "symbols": [
    "JestEnvironment"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import fs from 'node:fs';
import path from 'node:path';
import { createRequire } from 'node:module';
import {
  CustomTestEnvironment,
  createEnvironmentContext,
  createJestEnvironmentConfig,
} from '../index.mjs';

const require = createRequire(import.meta.url);

// 1. @jest/environment package.json declares type definitions entry point ./build/index.d.ts and version 29.7.0
const pkgJsonPath = require.resolve('@jest/environment/package.json');
const pkgJson = JSON.parse(fs.readFileSync(pkgJsonPath, 'utf8'));
assert.equal(pkgJson.name, '@jest/environment');
assert.equal(pkgJson.version, '29.7.0');
assert.equal(pkgJson.types, './build/index.d.ts');
assert.equal(pkgJson.exports['.'].types, './build/index.d.ts');

// 2. @jest/environment index.d.ts declares JestEnvironment class with constructor, global, fakeTimers, moduleMocker, getVmContext, setup, and teardown methods
const dtsPath = path.resolve(path.dirname(pkgJsonPath), pkgJson.types);
assert.ok(fs.existsSync(dtsPath));
const dtsContent = fs.readFileSync(dtsPath, 'utf8');

assert.ok(dtsContent.includes('export declare class JestEnvironment<Timer = unknown> {'));
assert.ok(dtsContent.includes('constructor(config: JestEnvironmentConfig, context: EnvironmentContext);'));
assert.ok(dtsContent.includes('global: Global.Global;'));
assert.ok(dtsContent.includes('fakeTimers: LegacyFakeTimers<Timer> | null;'));
assert.ok(dtsContent.includes('fakeTimersModern: ModernFakeTimers | null;'));
assert.ok(dtsContent.includes('moduleMocker: ModuleMocker | null;'));
assert.ok(dtsContent.includes('getVmContext(): Context | null;'));
assert.ok(dtsContent.includes('setup(): Promise<void>;'));
assert.ok(dtsContent.includes('teardown(): Promise<void>;'));
assert.ok(dtsContent.includes('handleTestEvent?: Circus.EventHandler;'));

// 3. @jest/environment index.d.ts declares JestEnvironmentConfig interface containing projectConfig and globalConfig
assert.ok(dtsContent.includes('export declare interface JestEnvironmentConfig {'));
assert.ok(dtsContent.includes('projectConfig: Config.ProjectConfig;'));
assert.ok(dtsContent.includes('globalConfig: Config.GlobalConfig;'));

// 4. @jest/environment index.d.ts declares EnvironmentContext type containing console, docblockPragmas, and testPath
assert.ok(dtsContent.includes('export declare type EnvironmentContext = {'));
assert.ok(dtsContent.includes('console: Console;'));
assert.ok(dtsContent.includes('docblockPragmas: Record<string, string | Array<string>>;'));
assert.ok(dtsContent.includes('testPath: string;'));

// 5. @jest/environment index.d.ts declares Jest interface with fake timer controls, module mocking, and test retries
assert.ok(dtsContent.includes('export declare interface Jest {'));
assert.ok(dtsContent.includes('advanceTimersByTime(msToRun: number): void;'));
assert.ok(dtsContent.includes('advanceTimersToNextTimer(steps?: number): void;'));
assert.ok(dtsContent.includes('useFakeTimers('));
assert.ok(dtsContent.includes('useRealTimers(): Jest;'));
assert.ok(dtsContent.includes('mock<T = unknown>('));
assert.ok(dtsContent.includes('fn: ModuleMocker[\'fn\'];'));
assert.ok(dtsContent.includes('spyOn: ModuleMocker[\'spyOn\'];'));
assert.ok(dtsContent.includes('retryTimes('));

// 6. @jest/environment index.d.ts declares ModuleWrapper and JestImportMeta type definitions
assert.ok(dtsContent.includes('export declare interface JestImportMeta extends ImportMeta {'));
assert.ok(dtsContent.includes('export declare type ModuleWrapper = ('));

// 7. CustomTestEnvironment initializes with JestEnvironmentConfig and EnvironmentContext and exposes global state and lifecycle hooks
const config = createJestEnvironmentConfig({ testEnvironment: 'custom' });
const context = createEnvironmentContext('/project/test/example.test.js', { customPragma: 'true' });
const env = new CustomTestEnvironment(config, context);

assert.equal(env.config.projectConfig.testEnvironment, 'custom');
assert.equal(env.context.testPath, '/project/test/example.test.js');
assert.equal(env.global.testPath, '/project/test/example.test.js');
assert.equal(env.global.customGlobalVar, 'custom_jest_environment_active');
assert.equal(env.getVmContext(), null);
assert.deepEqual(env.exportConditions(), ['node', 'jest-environment']);

// 8. CustomTestEnvironment setup and teardown manage environment lifecycle and handleTestEvent processes test runner events
await env.setup();
assert.equal(env.global.__ENVIRONMENT_READY__, true);

env.handleTestEvent({ name: 'test_start', test: { name: 'sample suite test case' } });
assert.equal(env.global.__LAST_TEST_STARTED__, 'sample suite test case');

await env.teardown();
assert.equal(env.global.__ENVIRONMENT_READY__, false);
assert.equal(env._isTornDown, true);

console.log('All @jest/environment contract assertions passed.');

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