@babel/core 7.29.7: parseAsync

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.parseAsync 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.parseAsync

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-core-parse-async",
  "version": "1.0.0",
  "description": "verify @babel/core.parseAsync in pkg:npm/%40babel/core@7.29.7",
  "type": "module",
  "main": "src/index.mjs",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "@babel/core": "7.29.7"
  },
  "license": "MIT-0"
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/core.parseAsync in pkg:npm/%40babel/core@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.7"
  ],
  "symbols": [
    "@babel/core.parseAsync"
  ]
}

import * as babel from "@babel/core";

const { parseAsync } = babel.default || babel;

/**
 * Asynchronously parses JavaScript code into a Babel AST with safe default options.
 *
 * @param {string} code - The source code to parse.
 * @param {object} [options={}] - Additional Babel transform/parse options.
 * @returns {Promise<object|null>} Promise resolving to the Babel File AST node or null.
 */
export async function parseCodeAsync(code, options = {}) {
  const opts = {
    configFile: false,
    babelrc: false,
    ...options,
  };
  return parseAsync(code, opts);
}

/**
 * Asynchronously parses code explicitly as an ES module.
 *
 * @param {string} code - The source code to parse.
 * @param {object} [options={}] - Additional Babel transform/parse options.
 * @returns {Promise<object|null>} Promise resolving to the Babel File AST node.
 */
export async function parseModule(code, options = {}) {
  return parseCodeAsync(code, {
    sourceType: "module",
    ...options,
  });
}

/**
 * Asynchronously parses code explicitly as a script.
 *
 * @param {string} code - The source code to parse.
 * @param {object} [options={}] - Additional Babel transform/parse options.
 * @returns {Promise<object|null>} Promise resolving to the Babel File AST node.
 */
export async function parseScript(code, options = {}) {
  return parseCodeAsync(code, {
    sourceType: "script",
    ...options,
  });
}

/**
 * Extracts top-level declaration names (variables, functions, classes) from a parsed AST.
 *
 * @param {object} ast - The Babel File AST node.
 * @returns {string[]} Array of top-level declared identifiers.
 */
export function extractTopLevelDeclarations(ast) {
  if (!ast || !ast.program || !Array.isArray(ast.program.body)) {
    return [];
  }
  const names = [];
  for (const node of ast.program.body) {
    if (node.type === "VariableDeclaration") {
      for (const decl of node.declarations) {
        if (decl.id && decl.id.type === "Identifier") {
          names.push(decl.id.name);
        }
      }
    } else if (
      (node.type === "FunctionDeclaration" || node.type === "ClassDeclaration") &&
      node.id &&
      node.id.type === "Identifier"
    ) {
      names.push(node.id.name);
    } else if (node.type === "ExportNamedDeclaration" && node.declaration) {
      const decl = node.declaration;
      if (decl.type === "VariableDeclaration") {
        for (const d of decl.declarations) {
          if (d.id && d.id.type === "Identifier") {
            names.push(d.id.name);
          }
        }
      } else if (
        (decl.type === "FunctionDeclaration" || decl.type === "ClassDeclaration") &&
        decl.id &&
        decl.id.type === "Identifier"
      ) {
        names.push(decl.id.name);
      }
    }
  }
  return names;
}

/**
 * Checks whether the provided code parses without syntax errors.
 *
 * @param {string} code - The source code to validate.
 * @param {object} [options={}] - Options passed to parseAsync.
 * @returns {Promise<boolean>} Promise resolving to true if valid, false otherwise.
 */
export async function isValidSyntax(code, options = {}) {
  try {
    const ast = await parseCodeAsync(code, options);
    return ast !== null;
  } catch {
    return false;
  }
}

/**
 * Parses code with customized parser options (e.g., tokens, ranges, custom syntax plugins).
 *
 * @param {string} code - The source code to parse.
 * @param {object} [parserOpts={}] - Parser options passed to Babel.
 * @param {object} [options={}] - Additional options.
 * @returns {Promise<object|null>} Promise resolving to the Babel File AST node.
 */
export async function parseWithParserOpts(code, parserOpts = {}, options = {}) {
  return parseCodeAsync(code, {
    parserOpts: {
      ...parserOpts,
    },
    ...options,
  });
}

export { parseAsync };

import assert from "node:assert/strict";
import * as babel from "@babel/core";
import {
  parseCodeAsync,
  parseModule,
  parseScript,
  extractTopLevelDeclarations,
  isValidSyntax,
  parseWithParserOpts,
  parseAsync,
} from "../src/index.mjs";

async function runContracts() {
  // Contract 1: parseAsync is exported as a function by @babel/core and returns a Promise resolving to a File AST node
  {
    assert.strictEqual(
      typeof parseAsync,
      "function",
      "@babel/core.parseAsync must be exported as a function"
    );
    assert.strictEqual(
      typeof babel.parseAsync,
      "function",
      "babel.parseAsync directly from @babel/core must be a function"
    );

    const ast = await parseAsync("const answer = 42;", {
      configFile: false,
      babelrc: false,
    });
    assert.ok(ast !== null, "parseAsync must resolve to an AST object");
    assert.strictEqual(ast.type, "File", "AST root node type must be File");
    assert.ok(ast.program, "AST must contain a program property");
    assert.strictEqual(ast.program.type, "Program", "ast.program type must be Program");
  }

  // Contract 2: parseCodeAsync parses JavaScript source into an AST with Program body containing top-level statements
  {
    const code = `
      function add(a, b) {
        return a + b;
      }
      const result = add(1, 2);
    `;
    const ast = await parseCodeAsync(code);
    assert.ok(ast !== null, "parseCodeAsync must return a non-null AST");
    assert.strictEqual(ast.type, "File");
    assert.ok(Array.isArray(ast.program.body), "ast.program.body must be an array");
    assert.strictEqual(ast.program.body.length, 2, "Expected 2 top-level statements");
    assert.strictEqual(ast.program.body[0].type, "FunctionDeclaration");
    assert.strictEqual(ast.program.body[1].type, "VariableDeclaration");
  }

  // Contract 3: parseModule parses ES module code with import and export declarations setting sourceType to module
  {
    const moduleCode = `
      import { readFile } from "node:fs/promises";
      export async function loadData() {
        return await readFile("data.txt", "utf-8");
      }
    `;
    const ast = await parseModule(moduleCode);
    assert.ok(ast !== null, "parseModule must return an AST for valid module code");
    assert.strictEqual(ast.program.sourceType, "module", "sourceType must be module");
    assert.strictEqual(ast.program.body[0].type, "ImportDeclaration");
    assert.strictEqual(ast.program.body[1].type, "ExportNamedDeclaration");
  }

  // Contract 4: parseScript parses script code setting sourceType to script
  {
    const scriptCode = "var x = 10; var y = 20;";
    const ast = await parseScript(scriptCode);
    assert.ok(ast !== null, "parseScript must return an AST for valid script code");
    assert.strictEqual(ast.program.sourceType, "script", "sourceType must be script");
    assert.strictEqual(ast.program.body.length, 2);
  }

  // Contract 5: extractTopLevelDeclarations identifies top-level variable, function, and class declaration names from parsed AST
  {
    const code = `
      const config = { timeout: 1000 };
      let counter = 0;
      function initialize() {}
      class ServiceManager {}
      export const exportedVal = 100;
      export function exportedFn() {}
    `;
    const ast = await parseCodeAsync(code, { sourceType: "module" });
    const declaredNames = extractTopLevelDeclarations(ast);
    assert.deepStrictEqual(declaredNames, [
      "config",
      "counter",
      "initialize",
      "ServiceManager",
      "exportedVal",
      "exportedFn",
    ]);
  }

  // Contract 6: isValidSyntax returns true for valid JavaScript code and false when parsing invalid syntax
  {
    const valid = await isValidSyntax("const x = [1, 2, 3].map(n => n * 2);");
    assert.strictEqual(valid, true, "isValidSyntax should return true for valid code");

    const invalid = await isValidSyntax("const x = ;;; invalid syntax");
    assert.strictEqual(invalid, false, "isValidSyntax should return false for invalid code");
  }

  // Contract 7: parseAsync rejects with a SyntaxError when given invalid JavaScript code
  {
    await assert.rejects(
      async () => {
        await parseAsync("function ( { broken syntax", {
          configFile: false,
          babelrc: false,
        });
      },
      (err) => {
        assert.ok(err instanceof SyntaxError || err.name === "SyntaxError");
        assert.ok(typeof err.loc === "object", "SyntaxError must provide loc metadata");
        return true;
      }
    );
  }

  // Contract 8: parseWithParserOpts preserves tokens and ranges when enabled in parser options
  {
    const code = "const num = 123;";
    const ast = await parseWithParserOpts(code, {
      tokens: true,
      ranges: true,
    });
    assert.ok(ast !== null, "AST must not be null");
    assert.ok(Array.isArray(ast.tokens), "ast.tokens must be an array when tokens: true");
    assert.ok(ast.tokens.length > 0, "ast.tokens must contain token items");
    assert.ok(Array.isArray(ast.program.range), "ast.program.range must be present when ranges: true");
  }

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

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