CodeSampleX

Exemple

@babel/plugin-transform-class-static-block 8.0.1

Échantillon vérifié pour npm @babel/plugin-transform-class-static-block 8.0.1. Le contrat s'est exécuté sur node 22 · linux alpine/x64 · docker et a réussi.

sha256:b62154915564a67185d6b8a506dcf07ea4917b670d57639d3834a4604a13bbad

Ce réseau offre une seule chose : un échantillon qui compile. Il l'a exécuté dans un bac à sable et conservé le reçu signé. Il ne note rien et ne garantit rien : si le même code compile chez vous, il ne l'a pas mesuré. Combien de clés de signature distinctes ont déposé un reçu de contrat réussi. Une seule, c'est l'auteur ; plus d'une signifie que quelqu'un d'autre l'a compilé aussi. Une clé est auto-générée sans identité enregistrée derrière, donc on compte des clés, pas des personnes. MIT-0

Preuves d'exécution

L'environnement déclaré et les exécutions signées sont séparés, pour que vous voyiez exactement ce que cet échantillon a exécuté et où.

Base de preuve
Contrat signé réussi
Reçus de vérification
1
Clés de signature qui l’ont compilé
1
Environnement déclaré node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Environnements des exécutions de vérification

Environnement Contrat Étapes Exécution
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

Cas

HOW
Objectif
verify pkg:npm/%40babel/plugin-transform-class-static-block@8.0.1
Paquets
Environnement
node 22.23.2
Créé
2026-08-27T20:45:30Z

Contrat

  1. Plugin default export is a function factory asserting Babel version compatibility
  2. Plugin factory returns a plugin object named transform-class-static-block with pre hook and ClassBody visitor
  3. Pre hook executes without error during file pass setup
  4. Transforms class declaration with static initialization block into compiled static block closure invocation
  5. Transforms class static block in class with static properties by prepending execution to property initializer
  6. Transforms multiple sequential static blocks in order
  7. Transforms anonymous class expression with static block and preserves static initialization behavior
  8. Allows private static field access and mutation inside static block
  9. Helper functions correctly initialize plugin and transform source code containing class static blocks

Fichiers

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

Télécharger l’artefact source (tar.gz)

Code source

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 pkg:npm/%40babel/plugin-transform-class-static-block@8.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-class-static-block@8.0.1
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:sha256:5a13544735f09b7529dc63e969829d2a74c929d7674bfda32fef61c387b5308b","constraints":{"executionContext":"node"},"contract":["Plugin default export is a function factory asserting Babel version compatibility","Plugin factory returns a plugin object named transform-class-static-block with pre hook and ClassBody visitor","Pre hook executes without error during file pass setup","Transforms class declaration with static initialization block into compiled static block closure invocation","Transforms class static block in class with static properties by prepending execution to property initializer","Transforms multiple sequential static blocks in order","Transforms anonymous class expression with static block and preserves static initialization behavior","Allows private static field access and mutation inside static block","Helper functions correctly initialize plugin and transform source code containing class static blocks"],"goal":"verify pkg:npm/%40babel/plugin-transform-class-static-block@8.0.1","kind":"HOW","packages":["pkg:npm/%40babel/plugin-transform-class-static-block@8.0.1"],"schemaVersion":1},"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/%40babel/plugin-transform-class-static-block@8.0.1"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-transform-class-static-block@8.0.1","verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-babel-plugin-transform-class-static-block",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/plugin-transform-class-static-block": "8.0.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-class-static-block@8.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-class-static-block@8.0.1"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.mjs
import * as babel from '@babel/core';
import classStaticBlockPlugin from '@babel/plugin-transform-class-static-block';

/**
 * Creates and initializes the class-static-block plugin instance.
 * @param {object} [api] - Babel API object with types, template, traverse, assertVersion.
 * @param {object} [options] - Optional plugin options.
 * @returns {object} Plugin instance object with name, pre, and visitor.
 */
export function createClassStaticBlockPlugin(api, options = {}) {
  const plugin = classStaticBlockPlugin.default || classStaticBlockPlugin;
  const babelApi = api || {
    types: babel.types,
    template: babel.template,
    traverse: babel.traverse,
    assertVersion: (range) => Boolean(range)
  };
  return plugin(babelApi, options);
}

/**
 * Transforms JavaScript source code using @babel/plugin-transform-class-static-block.
 * @param {string} source - Source code to transform.
 * @param {object} [options] - Additional Babel transform options.
 * @returns {import('@babel/core').BabelFileResult} Babel transform result.
 */
export function transformClassStaticBlock(source, options = {}) {
  const plugin = classStaticBlockPlugin.default || classStaticBlockPlugin;
  return babel.transformSync(source, {
    plugins: [plugin],
    configFile: false,
    babelrc: false,
    ...options
  });
}
test/contract.mjs
import assert from 'node:assert/strict';
import * as babel from '@babel/core';
import classStaticBlockPlugin from '@babel/plugin-transform-class-static-block';
import { createClassStaticBlockPlugin, transformClassStaticBlock } from '../src/index.mjs';

// 1. Plugin default export is a function factory asserting Babel version compatibility
const plugin = classStaticBlockPlugin.default || classStaticBlockPlugin;
assert.equal(typeof plugin, 'function', 'Plugin default export must be a function');

let assertedVersionRange = null;
const mockApi = {
  types: babel.types,
  template: babel.template,
  traverse: babel.traverse,
  assertVersion(range) {
    assertedVersionRange = range;
  }
};
const instance = plugin(mockApi, {});
assert.equal(assertedVersionRange, '^7.12.0 || ^8.0.0', 'Plugin must assert expected Babel version range');

// 2. Plugin factory returns a plugin object named transform-class-static-block with pre hook and ClassBody visitor
assert.equal(typeof instance, 'object', 'Plugin factory must return an object');
assert.equal(instance.name, 'transform-class-static-block', 'Plugin name must be transform-class-static-block');
assert.equal(typeof instance.pre, 'function', 'Plugin must define pre hook');
assert.ok(instance.visitor && typeof instance.visitor.ClassBody === 'function', 'Plugin must define ClassBody visitor');

// 3. Pre hook executes without error during file pass setup
const mockFilePass = {
  file: new Map(),
  set(key, val) { this.file.set(key, val); },
  get(key) { return this.file.get(key); }
};
assert.doesNotThrow(() => {
  instance.pre.call(mockFilePass);
}, 'pre hook must execute without throwing');

// 4. Transforms class declaration with static initialization block into compiled static block closure invocation
const codeBasic = `
class SimpleExample {
  static {
    SimpleExample.status = 'initialized';
  }
}
`;
const resultBasic = transformClassStaticBlock(codeBasic);
assert.ok(resultBasic.code.includes('_staticBlock'), 'Transformed code must contain _staticBlock identifier');
assert.ok(resultBasic.code.includes('_staticBlock()'), 'Transformed code must invoke the static block closure');

const evalBasic = new Function(resultBasic.code + '; return SimpleExample;')();
assert.equal(evalBasic.status, 'initialized', 'Static property set in static block must be initialized');

// 5. Transforms class static block in class with static properties by prepending execution to property initializer
const codeWithProp = `
class Config {
  static debug = false;
  static {
    Config.debug = true;
  }
  static ready = true;
}
`;
const resultWithProp = transformClassStaticBlock(codeWithProp);
const evalConfig = new Function(resultWithProp.code + '; return Config;')();
assert.equal(evalConfig.debug, true, 'Static block mutating static property must execute correctly');
assert.equal(evalConfig.ready, true, 'Subsequent static properties must be initialized');

// 6. Transforms multiple sequential static blocks in order
const codeMulti = `
class SequenceTest {
  static log = [];
  static {
    SequenceTest.log.push('step1');
  }
  static {
    SequenceTest.log.push('step2');
  }
  static {
    SequenceTest.log.push('step3');
  }
}
`;
const resultMulti = transformClassStaticBlock(codeMulti);
const evalMulti = new Function(resultMulti.code + '; return SequenceTest;')();
assert.deepEqual(evalMulti.log, ['step1', 'step2', 'step3'], 'Multiple static blocks must execute in sequential order');

// 7. Transforms anonymous class expression with static block and preserves static initialization behavior
const codeExpr = `
const AnonClass = class {
  static {
    this.boundValue = 999;
  }
};
`;
const resultExpr = transformClassStaticBlock(codeExpr);
const evalExpr = new Function(resultExpr.code + '; return AnonClass;')();
assert.equal(evalExpr.boundValue, 999, 'Class expression static block must bind this to class object');

// 8. Allows private static field access and mutation inside static block
const codePrivate = `
class SecretStore {
  static #token = 'default';
  static {
    SecretStore.#token = 'configured_token';
  }
  static getToken() {
    return SecretStore.#token;
  }
}
`;
const resultPrivate = transformClassStaticBlock(codePrivate);
const evalPrivate = new Function(resultPrivate.code + '; return SecretStore;')();
assert.equal(evalPrivate.getToken(), 'configured_token', 'Private static fields must be accessible and mutable in static block');

// 9. Helper functions correctly initialize plugin and transform source code containing class static blocks
const helperInstance = createClassStaticBlockPlugin();
assert.equal(helperInstance.name, 'transform-class-static-block', 'Helper plugin must return valid plugin instance');

const helperResult = transformClassStaticBlock('class A { static { A.ok = 1; } }');
assert.ok(helperResult.code.length > 0, 'Helper transform function must produce transformed code');
const evalHelper = new Function(helperResult.code + '; return A;')();
assert.equal(evalHelper.ok, 1, 'Helper transformed class must execute static block correctly');

console.log('Contract assertions passed.');

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