CodeSampleX

Exemple

@babel/core 7.29.7: transformFromAstAsync

Échantillon vérifié pour npm @babel/core 7.29.7: transformFromAstAsync. Le contrat s'est exécuté sur node 22 · linux alpine/x64 · docker et a réussi.

sha256:cb747dc620bef272744cc0317364e2211db741a881efbd71db24b17108458c7b

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 linux 24 · ubuntu · glibc 2.39 x64 npm

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…		 2026-08-23

Cas

HOW
Objectif
verify @babel/core.transformFromAstAsync in pkg:npm/%40babel/core@7.29.7
Paquets
Symboles
  • @babel/core.transformFromAstAsync
Créé
2026-08-23T06:31:18Z

Contrat

  1. transformFromAstAsync is exported by @babel/core as an async function and resolves to a transformation result object with code string
  2. transformAst helper transforms AST asynchronously and generates valid JavaScript code string
  3. transformFromAstAsync applies custom plugin visitors to modify AST nodes during transformation
  4. transformFromAstAsync generates source maps with version, sources, and mappings when sourceMaps is enabled
  5. transformFromAstAsync returns AST node with File root type when ast is enabled and defaults result.ast to null
  6. transformFromAstAsync preserves input AST by default and mutates it in place when cloneInputAst is false
  7. transformFromAstAsync returns null when filename matches configured ignore pattern
  8. transformFromAstAsync supports asynchronous plugin factory functions resolving to visitor plugins

Fichiers

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.js
  • 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 @babel/core.transformFromAstAsync 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.transformFromAstAsync

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:e774281fcd05cdd221afbe62b426f6c48ed8664ffd2d73082fbf31a962717460","contract":["transformFromAstAsync is exported by @babel/core as an async function and resolves to a transformation result object with code string","transformAst helper transforms AST asynchronously and generates valid JavaScript code string","transformFromAstAsync applies custom plugin visitors to modify AST nodes during transformation","transformFromAstAsync generates source maps with version, sources, and mappings when sourceMaps is enabled","transformFromAstAsync returns AST node with File root type when ast is enabled and defaults result.ast to null","transformFromAstAsync preserves input AST by default and mutates it in place when cloneInputAst is false","transformFromAstAsync returns null when filename matches configured ignore pattern","transformFromAstAsync supports asynchronous plugin factory functions resolving to visitor plugins"],"goal":"verify @babel/core.transformFromAstAsync in pkg:npm/%40babel/core@7.29.7","kind":"HOW","packages":["pkg:npm/%40babel/core@7.29.7"],"schemaVersion":1,"symbols":["@babel/core.transformFromAstAsync"]},"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.transformFromAstAsync"],"verifierAdapter":"node-typescript@1"}
package-lock.json
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package.json
{
  "name": "sample-babel-core-transform-from-ast-async",
  "version": "1.0.0",
  "description": "verify @babel/core.transformFromAstAsync 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.transformFromAstAsync in pkg:npm/%40babel/core@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.7"
  ],
  "symbols": [
    "@babel/core.transformFromAstAsync"
  ]
}
src/index.js
const babel = require('@babel/core');

/**
 * Asynchronously transforms a Babel AST node into code and metadata.
 *
 * @param {object} ast - The Babel File or Program AST node.
 * @param {string} [code] - Optional source code corresponding to the AST.
 * @param {object} [options={}] - Additional Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to the transformation result object.
 */
async function transformAst(ast, code, options = {}) {
  const defaultOptions = {
    configFile: false,
    babelrc: false,
    ...options
  };
  return await babel.transformFromAstAsync(ast, code, defaultOptions);
}

/**
 * Transforms an AST using a custom visitor plugin.
 *
 * @param {object} ast - The Babel AST node.
 * @param {object} visitor - AST visitor methods.
 * @param {object} [options={}] - Additional Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to the transformation result.
 */
async function transformAstWithVisitor(ast, visitor, options = {}) {
  const customPlugin = () => ({
    visitor
  });
  return await transformAst(ast, undefined, {
    plugins: [customPlugin],
    ...options
  });
}

/**
 * Transforms an AST and generates source maps.
 *
 * @param {object} ast - The Babel AST node.
 * @param {string} [filename='source.js'] - Virtual source filename.
 * @param {string} [code] - Optional source code.
 * @param {object} [options={}] - Additional Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to result containing map.
 */
async function transformAstWithSourceMap(ast, filename = 'source.js', code, options = {}) {
  return await transformAst(ast, code, {
    filename,
    sourceMaps: true,
    ...options
  });
}

/**
 * Transforms an AST and returns the transformed AST structure in the result.
 *
 * @param {object} ast - The Babel AST node.
 * @param {object} [options={}] - Additional Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to result containing ast.
 */
async function transformAstWithOutputAst(ast, options = {}) {
  return await transformAst(ast, undefined, {
    ast: true,
    ...options
  });
}

/**
 * Transforms an AST in place without cloning the input AST.
 *
 * @param {object} ast - The Babel AST node to mutate in place.
 * @param {object} visitor - AST visitor methods.
 * @param {object} [options={}] - Additional Babel transformation options.
 * @returns {Promise<object|null>} Promise resolving to the transformation result.
 */
async function transformAstInPlace(ast, visitor, options = {}) {
  const customPlugin = () => ({
    visitor
  });
  return await transformAst(ast, undefined, {
    cloneInputAst: false,
    plugins: [customPlugin],
    ...options
  });
}

/**
 * Checks whether the provided AST and options evaluate to ignored (null).
 *
 * @param {object} ast - The Babel AST node.
 * @param {object} options - Options containing ignore patterns and filename.
 * @returns {Promise<boolean>} Promise resolving to true if ignored.
 */
async function isIgnored(ast, options = {}) {
  const result = await transformAst(ast, undefined, options);
  return result === null;
}

module.exports = {
  transformAst,
  transformAstWithVisitor,
  transformAstWithSourceMap,
  transformAstWithOutputAst,
  transformAstInPlace,
  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 {
  transformAst,
  transformAstWithVisitor,
  transformAstWithSourceMap,
  transformAstWithOutputAst,
  transformAstInPlace,
  isIgnored
} = require('../src/index.js');

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

  // 2. transformAst helper transforms AST asynchronously and generates valid JavaScript code string
  {
    const ast = babel.parseSync('const sum = (a, b) => a + b;', {
      configFile: false,
      babelrc: false
    });
    const result = await transformAst(ast);
    assert.ok(result !== null, 'transformAst must return a non-null result');
    assert.equal(typeof result.code, 'string', 'Transformed result must contain code');
    assert.ok(result.code.includes('sum'), 'Transformed code must contain identifier');
  }

  // 3. transformFromAstAsync applies custom plugin visitors to modify AST nodes during transformation
  {
    const ast = babel.parseSync('const oldValue = 42;', {
      configFile: false,
      babelrc: false
    });
    const result = await transformAstWithVisitor(ast, {
      Identifier(path) {
        if (path.node.name === 'oldValue') {
          path.node.name = 'newValue';
        }
      }
    });
    assert.ok(result !== null, 'Result should not be null');
    assert.ok(result.code.includes('newValue'), 'Transformed code must contain modified identifier');
    assert.ok(!result.code.includes('oldValue'), 'Original identifier must be replaced');
  }

  // 4. transformFromAstAsync generates source maps with version, sources, and mappings when sourceMaps is enabled
  {
    const sourceCode = 'function multiply(x, y) { return x * y; }';
    const ast = babel.parseSync(sourceCode, {
      configFile: false,
      babelrc: false
    });
    const result = await transformAstWithSourceMap(ast, 'math.js', sourceCode);
    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('math.js'), 'Sources must include math.js');
    assert.equal(typeof result.map.mappings, 'string', 'Mappings must be a string');
  }

  // 5. transformFromAstAsync returns AST node with File root type when ast is enabled and defaults result.ast to null
  {
    const ast = babel.parseSync('let count = 0;', {
      configFile: false,
      babelrc: false
    });
    const defaultResult = await transformAst(ast);
    assert.equal(defaultResult.ast, null, 'Default result.ast must be null');

    const resultWithAst = await transformAstWithOutputAst(ast);
    assert.ok(resultWithAst !== null, 'Result should not be null');
    assert.ok(resultWithAst.ast !== null && typeof resultWithAst.ast === 'object', 'ast must be an object');
    assert.equal(resultWithAst.ast.type, 'File', 'Root AST type must be File');
    assert.ok(resultWithAst.ast.program !== null, 'Program node must exist');
    assert.equal(resultWithAst.ast.program.type, 'Program', 'AST program type must be Program');
    assert.ok(Array.isArray(resultWithAst.ast.program.body), 'Program body must be an array');
  }

  // 6. transformFromAstAsync preserves input AST by default and mutates it in place when cloneInputAst is false
  {
    const astPreserved = babel.parseSync('let counter = 1;', {
      configFile: false,
      babelrc: false
    });
    await transformAstWithVisitor(astPreserved, {
      VariableDeclaration(path) {
        path.node.kind = 'const';
      }
    });
    assert.equal(astPreserved.program.body[0].kind, 'let', 'Input AST must remain unchanged when cloneInputAst defaults to true');

    const astMutated = babel.parseSync('let counter = 1;', {
      configFile: false,
      babelrc: false
    });
    await transformAstInPlace(astMutated, {
      VariableDeclaration(path) {
        path.node.kind = 'const';
      }
    });
    assert.equal(astMutated.program.body[0].kind, 'const', 'Input AST must be mutated in place when cloneInputAst is false');
  }

  // 7. transformFromAstAsync returns null when filename matches configured ignore pattern
  {
    const ast = babel.parseSync('const secretKey = "hidden";', {
      configFile: false,
      babelrc: false
    });
    const ignored = await isIgnored(ast, {
      filename: '/workspace/test/ignored-sample.js',
      ignore: ['/workspace/test/ignored-sample.js']
    });
    assert.equal(ignored, true, 'isIgnored must return true for ignored filename');

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

  // 8. transformFromAstAsync supports asynchronous plugin factory functions resolving to visitor plugins
  {
    const ast = babel.parseSync('let pending = true;', {
      configFile: false,
      babelrc: false
    });
    const asyncPlugin = async () => {
      await new Promise((res) => setTimeout(res, 5));
      return {
        visitor: {
          Identifier(path) {
            if (path.node.name === 'pending') {
              path.node.name = 'resolved';
            }
          }
        }
      };
    };

    const result = await transformAst(ast, undefined, {
      plugins: [asyncPlugin]
    });
    assert.ok(result !== null, 'Async plugin transform must not be null');
    assert.ok(result.code.includes('resolved'), 'Async visitor transformation must be applied');
    assert.ok(!result.code.includes('pending'), 'Original identifier should not remain');
  }

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

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

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