@babel/plugin-transform-class-static-block 7.29.7

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@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-class-static-block@7.29.7

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.

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{
  "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": "7.29.7"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-class-static-block@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-class-static-block@7.29.7"
  ]
}

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, manipulateOptions, 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
  });
}

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 || ^8.0.0-0 || >8.0.0-alpha <8.0.0-beta', 'Plugin must assert expected Babel version range');

// 2. Plugin factory returns a plugin object named transform-class-static-block with manipulateOptions 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.manipulateOptions, 'function', 'Plugin must define manipulateOptions');
assert.ok(instance.visitor && typeof instance.visitor.ClassBody === 'function', 'Plugin must define ClassBody visitor');

// 3. manipulateOptions adds classStaticBlock to parser plugins list
const parserOpts = { plugins: [] };
instance.manipulateOptions({}, parserOpts);
assert.deepEqual(parserOpts.plugins, ['classStaticBlock'], 'manipulateOptions must register classStaticBlock parser plugin');

// 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.');