@babel/core 7.29.7: transformFromAstSync

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.transformFromAstSync 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.transformFromAstSync

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-transform-from-ast-sync",
  "version": "1.0.0",
  "description": "verify @babel/core.transformFromAstSync 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.transformFromAstSync in pkg:npm/%40babel/core@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.29.7"
  ],
  "symbols": [
    "@babel/core.transformFromAstSync"
  ]
}

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

/**
 * Transforms an existing AST synchronously using @babel/core.transformFromAstSync.
 *
 * @param {object} ast - The Babel AST node (e.g., File or Program) to transform.
 * @param {string} [code=""] - Optional original source code.
 * @param {object} [options={}] - Additional Babel transform options.
 * @returns {object|null} The transformation result object containing code, map, and ast.
 */
export function transformAst(ast, code = "", options = {}) {
  const finalOptions = {
    configFile: false,
    babelrc: false,
    ...options,
  };
  return babel.transformFromAstSync(ast, code, finalOptions);
}

/**
 * Transforms an AST with a specific plugin visitor function.
 *
 * @param {object} ast - The AST node to transform.
 * @param {Function|object} plugin - Babel plugin function or plugin object with visitor.
 * @param {object} [options={}] - Additional options.
 * @returns {string} The transformed code output.
 */
export function transformAstWithPlugin(ast, plugin, options = {}) {
  const result = transformAst(ast, "", {
    plugins: [plugin],
    ...options,
  });
  return result ? result.code : "";
}

/**
 * Transforms an AST and requests the updated AST object in the return value.
 *
 * @param {object} ast - The AST node to transform.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The transformed AST node from result.ast.
 */
export function transformAstToAst(ast, options = {}) {
  const result = transformAst(ast, "", {
    ast: true,
    code: false,
    ...options,
  });
  return result ? result.ast : null;
}

/**
 * Transforms an AST in place without cloning the input AST tree.
 *
 * @param {object} ast - The input AST node that will be mutated.
 * @param {Function|object} plugin - Babel plugin with AST mutations.
 * @param {object} [options={}] - Additional options.
 * @returns {object|null} The transformation result.
 */
export function transformAstInPlace(ast, plugin, options = {}) {
  return transformAst(ast, "", {
    cloneInputAst: false,
    plugins: [plugin],
    ...options,
  });
}

/**
 * Transforms an AST and generates an associated source map.
 *
 * @param {object} ast - The AST node to transform.
 * @param {string} code - The original source code corresponding to the AST.
 * @param {string} filename - Filename to associate with the source map.
 * @param {object} [options={}] - Additional options.
 * @returns {{code: string, map: object|null}} Generated code and source map object.
 */
export function transformAstWithSourceMap(ast, code, filename = "input.js", options = {}) {
  const result = transformAst(ast, code, {
    sourceMaps: true,
    filename,
    ...options,
  });
  return {
    code: result ? result.code : "",
    map: result ? result.map : null,
  };
}

export { babel };

import assert from "node:assert/strict";
import * as babel from "@babel/core";
import {
  transformAst,
  transformAstWithPlugin,
  transformAstToAst,
  transformAstInPlace,
  transformAstWithSourceMap,
} from "../src/index.mjs";

function parseCode(code) {
  return babel.parseSync(code, {
    configFile: false,
    babelrc: false,
    sourceType: "module",
  });
}

function runContracts() {
  // Contract 1: babel.transformFromAstSync is exported as a function by @babel/core and transforms an AST into generated code
  {
    assert.strictEqual(
      typeof babel.transformFromAstSync,
      "function",
      "babel.transformFromAstSync must be a function"
    );

    const ast = parseCode("const x = 42;");
    const result = babel.transformFromAstSync(ast, "const x = 42;", {
      configFile: false,
      babelrc: false,
    });

    assert.ok(result !== null, "transformFromAstSync must return a result object");
    assert.strictEqual(typeof result.code, "string", "result.code must be a string");
    assert.ok(result.code.includes("const x = 42;"), "result.code must contain generated code");
  }

  // Contract 2: transformFromAstSync returns null for result.ast by default when options.ast is not explicitly enabled
  {
    const ast = parseCode("let greeting = 'hello';");
    const result = transformAst(ast, "let greeting = 'hello';");

    assert.ok(result !== null, "result must not be null");
    assert.strictEqual(result.ast, null, "result.ast must be strictly null by default");
    assert.strictEqual(typeof result.code, "string", "result.code must be present");
  }

  // Contract 3: transformFromAstSync returns the transformed AST node on result.ast when options.ast is set to true
  {
    const ast = parseCode("function greet() { return 'hi'; }");
    const returnedAst = transformAstToAst(ast);

    assert.ok(returnedAst !== null, "transformAstToAst must return a valid AST node");
    assert.strictEqual(returnedAst.type, "File", "returned AST must have type 'File'");
    assert.ok(returnedAst.program, "returned AST must have a program node");
    assert.strictEqual(returnedAst.program.body[0].type, "FunctionDeclaration");
  }

  // Contract 4: transformFromAstSync preserves the input AST unmutated by default because cloneInputAst defaults to true
  {
    const ast = parseCode("let value = 1;");
    const renamePlugin = () => ({
      visitor: {
        Identifier(path) {
          if (path.node.name === "value") {
            path.node.name = "renamedValue";
          }
        },
      },
    });

    const transformedCode = transformAstWithPlugin(ast, renamePlugin);
    assert.ok(transformedCode.includes("renamedValue"), "Output code must reflect plugin changes");

    // The original input ast should still have identifier 'value'
    const originalDecl = ast.program.body[0].declarations[0];
    assert.strictEqual(
      originalDecl.id.name,
      "value",
      "Input AST identifier must remain unmutated when cloneInputAst defaults to true"
    );
  }

  // Contract 5: transformFromAstSync mutates the provided AST in place when cloneInputAst is set to false
  {
    const ast = parseCode("let count = 0;");
    const renamePlugin = () => ({
      visitor: {
        Identifier(path) {
          if (path.node.name === "count") {
            path.node.name = "mutatedCount";
          }
        },
      },
    });

    const result = transformAstInPlace(ast, renamePlugin);
    assert.ok(result !== null, "In-place transform result must not be null");

    // The original input AST object should have been mutated in place
    const mutatedDecl = ast.program.body[0].declarations[0];
    assert.strictEqual(
      mutatedDecl.id.name,
      "mutatedCount",
      "Input AST must be mutated in place when cloneInputAst: false"
    );
  }

  // Contract 6: transformFromAstSync applies plugin visitors to transform AST nodes and produces modified output code
  {
    const ast = parseCode("const a = 10; const b = 20;");
    const pluginChangeConstToVar = () => ({
      visitor: {
        VariableDeclaration(path) {
          if (path.node.kind === "const") {
            path.node.kind = "var";
          }
        },
      },
    });

    const output = transformAstWithPlugin(ast, pluginChangeConstToVar);
    assert.ok(!output.includes("const"), "Transformed code should not contain const");
    assert.ok(output.includes("var a = 10;"), "Transformed code must contain var a = 10;");
    assert.ok(output.includes("var b = 20;"), "Transformed code must contain var b = 20;");
  }

  // Contract 7: transformFromAstSync produces source map mappings when options.sourceMaps is enabled
  {
    const sourceCode = "const num = 100;\nconsole.log(num);";
    const ast = parseCode(sourceCode);
    const { code, map } = transformAstWithSourceMap(ast, sourceCode, "example.js");

    assert.ok(typeof code === "string" && code.length > 0, "Generated code must not be empty");
    assert.ok(map !== null, "Source map must be returned when sourceMaps is enabled");
    assert.strictEqual(map.version, 3, "Source map version must be 3");
    assert.ok(Array.isArray(map.sources), "Source map sources must be an array");
    assert.ok(map.sources.includes("example.js"), "Source map sources must include the input filename");
    assert.ok(typeof map.mappings === "string" && map.mappings.length > 0, "Mappings string must not be empty");
  }

  // Contract 8: transformFromAstSync throws synchronously when invalid options or plugin execution errors occur
  {
    const ast = parseCode("const invalid = true;");
    const failingPlugin = () => ({
      visitor: {
        Identifier() {
          throw new Error("Plugin processing failed as expected");
        },
      },
    });

    assert.throws(
      () => {
        babel.transformFromAstSync(ast, "const invalid = true;", {
          configFile: false,
          babelrc: false,
          plugins: [failingPlugin],
        });
      },
      /Plugin processing failed as expected/,
      "transformFromAstSync must propagate synchronous plugin errors"
    );
  }

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

runContracts();