@babel/core 7.22.5: loadPartialConfigAsync

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.loadPartialConfigAsync in pkg:npm/%40babel/core@7.22.5
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/core@7.22.5
Demonstrate these symbols/APIs:
  - @babel/core.loadPartialConfigAsync

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-load-partial-config-async",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.22.5"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify @babel/core.loadPartialConfigAsync in pkg:npm/%40babel/core@7.22.5",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/core@7.22.5"
  ],
  "symbols": [
    "@babel/core.loadPartialConfigAsync"
  ]
}

import { loadPartialConfigAsync } from "@babel/core";

export async function loadConfigAsync(options = {}) {
  return await loadPartialConfigAsync(options);
}

export async function isConfigIgnored(options = {}) {
  const config = await loadPartialConfigAsync(options);
  return config === null;
}

export async function getResolvedOptions(options = {}) {
  const config = await loadPartialConfigAsync(options);
  return config ? config.options : null;
}

import assert from "node:assert/strict";
import { loadPartialConfigAsync } from "@babel/core";
import {
  loadConfigAsync,
  isConfigIgnored,
  getResolvedOptions
} from "../src/index.mjs";

// Test 1: loadPartialConfigAsync returns a Promise resolving to a PartialConfig object containing options and fileHandling
{
  const configPromise = loadPartialConfigAsync({
    configFile: false,
    babelrc: false
  });
  assert.ok(configPromise instanceof Promise);

  const config = await configPromise;
  assert.ok(config);
  assert.equal(typeof config, "object");
  assert.equal(typeof config.hasFilesystemConfig, "function");
  assert.equal(config.hasFilesystemConfig(), false);
  assert.equal(config.fileHandling, "transpile");
  assert.ok(config.options);
  assert.equal(typeof config.options, "object");
  assert.equal(config.options.configFile, false);
  assert.equal(config.options.babelrc, false);

  const helperResult = await loadConfigAsync({
    configFile: false,
    babelrc: false
  });
  assert.ok(helperResult);
  assert.equal(helperResult.fileHandling, "transpile");
}

// Test 2: loadPartialConfigAsync merges provided inline configuration options such as sourceMaps and minified
{
  const config = await loadPartialConfigAsync({
    configFile: false,
    babelrc: false,
    sourceMaps: true,
    minified: true,
    comments: false
  });
  assert.ok(config);
  assert.equal(config.options.sourceMaps, true);
  assert.equal(config.options.minified, true);
  assert.equal(config.options.comments, false);

  const resolvedOpts = await getResolvedOptions({
    configFile: false,
    babelrc: false,
    sourceMaps: "inline"
  });
  assert.equal(resolvedOpts.sourceMaps, "inline");
}

// Test 3: loadPartialConfigAsync resolves to null when the target file matches an ignore pattern
{
  const result = await loadPartialConfigAsync({
    configFile: false,
    babelrc: false,
    filename: "ignored-module.js",
    ignore: ["ignored-module.js"]
  });
  assert.equal(result, null);

  const isIgnored = await isConfigIgnored({
    configFile: false,
    babelrc: false,
    filename: "ignored-module.js",
    ignore: ["ignored-module.js"]
  });
  assert.equal(isIgnored, true);

  const isNotIgnored = await isConfigIgnored({
    configFile: false,
    babelrc: false,
    filename: "active-module.js",
    ignore: ["ignored-module.js"]
  });
  assert.equal(isNotIgnored, false);
}

// Test 4: loadPartialConfigAsync rejects with an Error when invalid or unknown options are provided
{
  await assert.rejects(
    async () => {
      await loadPartialConfigAsync({
        nonExistentBabelOption: true
      });
    },
    {
      name: "Error",
      message: /Unknown option: \.nonExistentBabelOption/
    }
  );

  await assert.rejects(
    async () => {
      await loadConfigAsync({
        anotherInvalidOption: 123
      });
    },
    {
      name: "Error",
      message: /Unknown option: \.anotherInvalidOption/
    }
  );
}

// Test 5: loadPartialConfigAsync normalizes plugin declarations into ConfigItem objects within options.plugins
{
  const dummyPlugin = () => ({ visitor: {} });
  const config = await loadPartialConfigAsync({
    configFile: false,
    babelrc: false,
    plugins: [dummyPlugin]
  });
  assert.ok(config);
  assert.ok(Array.isArray(config.options.plugins));
  assert.equal(config.options.plugins.length, 1);

  const pluginItem = config.options.plugins[0];
  assert.ok(pluginItem);
  assert.equal(pluginItem.value, dummyPlugin);
}

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