CodeSampleX

示例

@babel/core 7.29.7: transformAsync

已验证示例 — npm @babel/core 7.29.7: transformAsync. contract 在 node 22 · linux alpine/x64 · docker 上运行并通过： transformAsync is exported by @babel/core as an async…

sha256:6964a5a74edbf7ee78626ba534e0f9df996f710791656d48d660164e08064851

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 linux 24 · ubuntu · glibc 2.39 x64 npm

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…		 2026-08-23

案例

HOW
目标
verify @babel/core.transformAsync in pkg:npm/%40babel/core@7.29.7
包
符号
  • @babel/core.transformAsync
创建时间
2026-08-23T06:29:02Z

契约

  1. transformAsync is exported by @babel/core as an async function and resolves to a transformation result object with code string
  2. transformCode helper transforms JavaScript code asynchronously and returns code string
  3. transformAsync applies custom plugin visitors to modify AST identifiers
  4. transformAsync generates source maps with version, sources, and mappings when sourceMaps is enabled
  5. transformAsync returns AST node with File root type and Program body when ast is enabled
  6. transformAsync returns null when filename matches configured ignore pattern
  7. transformAsync rejects with SyntaxError when input contains invalid syntax
  8. transformAsync supports asynchronous plugin factory functions resolving to visitor plugins

文件

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

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 @babel/core.transformAsync in pkg:npm/%40babel/core@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.29.7
Demonstrate these symbols/APIs:
  - @babel/core.transformAsync

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:dab04e4db1c803ac713b8688f5560582cd50c87852d8da6cb08259c96456c45a","contract":["transformAsync is exported by @babel/core as an async function and resolves to a transformation result object with code string","transformCode helper transforms JavaScript code asynchronously and returns code string","transformAsync applies custom plugin visitors to modify AST identifiers","transformAsync generates source maps with version, sources, and mappings when sourceMaps is enabled","transformAsync returns AST node with File root type and Program body when ast is enabled","transformAsync returns null when filename matches configured ignore pattern","transformAsync rejects with SyntaxError when input contains invalid syntax","transformAsync supports asynchronous plugin factory functions resolving to visitor plugins"],"goal":"verify @babel/core.transformAsync in pkg:npm/%40babel/core@7.29.7","kind":"HOW","packages":["pkg:npm/%40babel/core@7.29.7"],"schemaVersion":1,"symbols":["@babel/core.transformAsync"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"npm","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/%40babel/core@7.29.7"],"schemaVersion":1,"subject":"pkg:npm/%40babel/core@7.29.7","symbols":["@babel/core.transformAsync"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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  "name": "sample-babel-core-transform-async",
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package.json
{
  "name": "sample-babel-core-transform-async",
  "version": "1.0.0",
  "description": "verify @babel/core.transformAsync in pkg:npm/%40babel/core@7.29.7",
  "main": "src/index.js",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/core": "7.29.7"
  },
  "license": "MIT-0"
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify @babel/core.transformAsync in pkg:npm/%40babel/core@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.7"
  ],
  "symbols": [
    "@babel/core.transformAsync"
  ]
}
src/index.js
const babel = require('@babel/core');

/**
 * Transforms JavaScript code asynchronously using @babel/core.transformAsync.
 *
 * @param {string} code - The source code to transform.
 * @param {object} [options={}] - Optional Babel transform options.
 * @returns {Promise<object|null>} The transformation result with code, map, and ast.
 */
async function transformCode(code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return await babel.transformAsync(code, defaultOptions);
}

/**
 * Transforms code with a custom AST visitor plugin.
 *
 * @param {string} code - The source code to transform.
 * @param {object} visitor - AST visitor map.
 * @param {object} [options={}] - Additional transform options.
 * @returns {Promise<object|null>} The transformation result.
 */
async function transformWithVisitor(code, visitor, options = {}) {
  const customPlugin = () => ({
    visitor
  });
  return await transformCode(code, {
    plugins: [customPlugin],
    ...options
  });
}

/**
 * Transforms code and produces a source map.
 *
 * @param {string} code - The source code to transform.
 * @param {string} [filename='source.js'] - Virtual filename for source mapping.
 * @param {object} [options={}] - Additional transform options.
 * @returns {Promise<object|null>} The transformation result with source map.
 */
async function transformWithSourceMap(code, filename = 'source.js', options = {}) {
  return await transformCode(code, {
    filename,
    sourceMaps: true,
    ...options
  });
}

/**
 * Transforms code and returns AST node structure along with transformed code.
 *
 * @param {string} code - The source code to transform.
 * @param {object} [options={}] - Additional transform options.
 * @returns {Promise<object|null>} The transformation result containing ast.
 */
async function transformWithAst(code, options = {}) {
  return await transformCode(code, {
    ast: true,
    ...options
  });
}

/**
 * Checks whether the provided code and options evaluate to ignored (null).
 *
 * @param {string} code - The source code to test.
 * @param {object} options - Options containing ignore rules and filename.
 * @returns {Promise<boolean>} True if transformation returns null.
 */
async function isIgnored(code, options = {}) {
  const result = await transformCode(code, options);
  return result === null;
}

module.exports = {
  transformCode,
  transformWithVisitor,
  transformWithSourceMap,
  transformWithAst,
  isIgnored
};
test/contract.mjs
import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import * as babel from '@babel/core';

const require = createRequire(import.meta.url);
const {
  transformCode,
  transformWithVisitor,
  transformWithSourceMap,
  transformWithAst,
  isIgnored
} = require('../src/index.js');

async function runContracts() {
  // 1. transformAsync is exported by @babel/core as an async function and resolves to a transformation result object with code string
  {
    assert.equal(typeof babel.transformAsync, 'function', 'babel.transformAsync must be exported as a function');
    const input = 'const answer = 42;';
    const result = await babel.transformAsync(input, {
      configFile: false,
      babelrc: false
    });
    assert.ok(result !== null, 'transformAsync should resolve to an object');
    assert.equal(typeof result, 'object', 'Result must be an object');
    assert.equal(typeof result.code, 'string', 'Result must have code string');
    assert.ok(result.code.includes('const answer = 42;'), 'Code string should contain input declaration');
  }

  // 2. transformCode helper transforms JavaScript code asynchronously and returns code string
  {
    const input = 'const multiply = (a, b) => a * b;';
    const result = await transformCode(input);
    assert.ok(result !== null, 'transformCode must return a non-null result');
    assert.equal(typeof result.code, 'string', 'Transformed result must contain code');
    assert.ok(result.code.includes('multiply'), 'Transformed code must contain identifier');
  }

  // 3. transformAsync applies custom plugin visitors to modify AST identifiers
  {
    const input = 'const originalVariable = 100;';
    const result = await transformWithVisitor(input, {
      Identifier(path) {
        if (path.node.name === 'originalVariable') {
          path.node.name = 'renamedVariable';
        }
      }
    });
    assert.ok(result !== null, 'Result should not be null');
    assert.ok(result.code.includes('renamedVariable'), 'Renamed identifier must appear in transformed code');
    assert.ok(!result.code.includes('originalVariable'), 'Original identifier must be replaced');
  }

  // 4. transformAsync generates source maps with version, sources, and mappings when sourceMaps is enabled
  {
    const input = 'function greet(name) { return `Hello, ${name}`; }';
    const result = await transformWithSourceMap(input, 'virtual-greet.js');
    assert.ok(result !== null, 'Result should not be null');
    assert.ok(result.map !== null && typeof result.map === 'object', 'Source map must be an object');
    assert.equal(result.map.version, 3, 'Source map version must be 3');
    assert.ok(Array.isArray(result.map.sources), 'Source map sources must be an array');
    assert.ok(result.map.sources.includes('virtual-greet.js'), 'Sources must include virtual-greet.js');
    assert.equal(typeof result.map.mappings, 'string', 'Mappings must be a string');
  }

  // 5. transformAsync returns AST node with File root type and Program body when ast is enabled
  {
    const input = 'const x = 10;';
    const result = await transformWithAst(input);
    assert.ok(result !== null, 'Result should not be null');
    assert.ok(result.ast !== null && typeof result.ast === 'object', 'ast must be an object');
    assert.equal(result.ast.type, 'File', 'Root AST type must be File');
    assert.ok(result.ast.program !== null, 'Program node must exist in AST');
    assert.equal(result.ast.program.type, 'Program', 'AST program type must be Program');
    assert.ok(Array.isArray(result.ast.program.body), 'Program body must be an array');
    assert.equal(result.ast.program.body.length, 1, 'Program body should have 1 statement');
  }

  // 6. transformAsync returns null when filename matches configured ignore pattern
  {
    const ignored = await isIgnored('const secret = true;', {
      filename: '/workspace/test/ignored-sample.js',
      ignore: ['/workspace/test/ignored-sample.js']
    });
    assert.equal(ignored, true, 'isIgnored must return true when file is ignored');

    const directResult = await babel.transformAsync('const secret = true;', {
      configFile: false,
      babelrc: false,
      filename: '/workspace/test/ignored-sample.js',
      ignore: ['/workspace/test/ignored-sample.js']
    });
    assert.equal(directResult, null, 'Direct transformAsync must return null for ignored files');
  }

  // 7. transformAsync rejects with SyntaxError when input contains invalid syntax
  {
    let errorCaught = null;
    try {
      await transformCode('const invalid = ;;;');
    } catch (err) {
      errorCaught = err;
    }
    assert.ok(errorCaught !== null, 'Must throw error on invalid syntax');
    assert.ok(errorCaught instanceof SyntaxError || errorCaught.name === 'SyntaxError', 'Error must be SyntaxError');
    assert.equal(errorCaught.code, 'BABEL_PARSE_ERROR', 'Error code must be BABEL_PARSE_ERROR');
    assert.ok(typeof errorCaught.loc === 'object', 'SyntaxError must include loc object');
  }

  // 8. transformAsync supports asynchronous plugin factory functions resolving to visitor plugins
  {
    const asyncPlugin = async () => {
      await new Promise((res) => setTimeout(res, 5));
      return {
        visitor: {
          Identifier(path) {
            if (path.node.name === 'beforeAsync') {
              path.node.name = 'afterAsync';
            }
          }
        }
      };
    };

    const result = await transformCode('let beforeAsync = 1;', {
      plugins: [asyncPlugin]
    });
    assert.ok(result !== null, 'Async plugin transform must not be null');
    assert.ok(result.code.includes('afterAsync'), 'Async visitor transformation must be applied');
    assert.ok(!result.code.includes('beforeAsync'), 'Old identifier should not remain');
  }

  console.log('All @babel/core.transformAsync contract tests passed successfully.');
}

runContracts().catch((err) => {
  console.error('Contract test failed:', err);
  process.exit(1);
});

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