@babel/plugin-transform-computed-properties 7.29.7

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 pkg:npm/%40babel/plugin-transform-computed-properties@7.29.7
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-computed-properties@7.29.7

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-transform-computed-properties",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "license": "MIT-0",
  "dependencies": {
    "@babel/core": "7.26.9",
    "@babel/plugin-transform-computed-properties": "7.29.7"
  }
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:npm/%40babel/plugin-transform-computed-properties@7.29.7",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-computed-properties@7.29.7"
  ]
}

import { transformSync } from "@babel/core";
import pluginComputedProps from "@babel/plugin-transform-computed-properties";
import assert from "node:assert";

// 1. Verify standard transformation of computed property keys in object literals
const code1 = `
function createObject() {
  const key = "dynamicKey";
  const obj = {
    [key]: "dynamicValue",
    staticKey: 100
  };
  return obj;
}
`;

const res1 = transformSync(code1, {
  plugins: [pluginComputedProps],
  configFile: false,
  babelrc: false
});

assert(res1 && typeof res1.code === "string", "Transformation should return code string");
assert(!res1.code.includes("[key]:"), "Transformed code should transform computed property syntax");

const fn1 = new Function(res1.code + "\nreturn createObject();");
const obj1 = fn1();
assert.strictEqual(obj1.dynamicKey, "dynamicValue", "dynamicKey should equal dynamicValue");
assert.strictEqual(obj1.staticKey, 100, "staticKey should equal 100");

// 2. Verify loose mode transformation option
const code2 = `
function createLooseObject() {
  const key = "looseKey";
  const obj = {
    [key]: 200
  };
  return obj;
}
`;

const res2 = transformSync(code2, {
  plugins: [[pluginComputedProps, { loose: true }]],
  configFile: false,
  babelrc: false
});

assert(res2 && typeof res2.code === "string", "Loose transformation should return code string");
const fn2 = new Function(res2.code + "\nreturn createLooseObject();");
const obj2 = fn2();
assert.strictEqual(obj2.looseKey, 200, "looseKey should equal 200");

console.log("All contract checks passed successfully.");