bare-runtime 1.31.0: locate Bare binary prebuild path and spawn child process to execute JavaScript code

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: locate Bare binary prebuild path and spawn child process to execute JavaScript code
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/bare-runtime@1.31.0
Demonstrate these symbols/APIs:
  - runtime
  - spawn

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.

{"case":{"caseId":"case:sha256:60384c6b96d587265f5e3b9cc4a9cc144ce047aec715cbbd70cbc8a076b5afe5","contract":["verifies bare-runtime package manifest exports mapping and CLI bin specification","runtime resolves prebuilt Bare binary path for current platform and architecture","runtime throws error when target platform has no prebuilt binary","runtime throws error when specified referrer binary is missing","spawn sets executable permissions and spawns ChildProcess with stdio streams","verifies bin/bare CLI launcher script structure and delegation to spawn"],"goal":"locate Bare binary prebuild path and spawn child process to execute JavaScript code","kind":"HOW","packages":["pkg:npm/bare-runtime@1.31.0"],"schemaVersion":1,"symbols":["runtime","spawn"]},"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/bare-runtime@1.31.0"],"schemaVersion":1,"subject":"pkg:npm/bare-runtime@1.31.0","symbols":["runtime","spawn"],"verifierAdapter":"node-typescript@1"}

import runtime from 'bare-runtime';
import spawn from 'bare-runtime/spawn';

export function getRuntimePath(referrer, opts) {
  return runtime(referrer, opts);
}

export function spawnBare(referrer, opts) {
  return spawn(referrer, opts);
}

export { runtime, spawn };
export default runtime;

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}

{
  "name": "sample-bare-runtime",
  "version": "1.0.0",
  "type": "module",
  "private": true,
  "dependencies": {
    "bare-runtime": "1.31.0"
  }
}

{
  "schemaVersion": 1,
  "goal": "locate Bare binary prebuild path and spawn child process to execute JavaScript code",
  "kind": "HOW",
  "packages": [
    "pkg:npm/bare-runtime@1.31.0"
  ],
  "symbols": [
    "runtime",
    "spawn"
  ]
}

import assert from 'node:assert/strict';
import { createRequire } from 'node:module';
import fs from 'node:fs';
import path from 'node:path';

const require = createRequire(import.meta.url);

const runtime = require('bare-runtime');
const spawn = require('bare-runtime/spawn');
const pkg = require('bare-runtime/package');

// 1. Verify package manifest exports and metadata
assert.equal(pkg.name, 'bare-runtime', 'Package name must be bare-runtime');
assert.equal(pkg.version, '1.31.0', 'Package version must be 1.31.0');
assert.equal(pkg.exports['.'], './index.js', 'Root export must point to index.js');
assert.equal(pkg.exports['./spawn'], './lib/spawn.js', 'Spawn export must point to lib/spawn.js');
assert.equal(pkg.exports['./package'], './package.json', 'Package export must point to package.json');
assert.equal(pkg.bin.bare, 'bin/bare', 'CLI bin must point to bin/bare');

// 2. runtime resolves prebuilt Bare binary path for current platform and arch
const binPath = runtime();
assert.equal(typeof binPath, 'string', 'Binary path must be a string');
assert.ok(binPath.endsWith(path.join('bin', 'bare')) || binPath.endsWith('bare.exe'), 'Binary path must point to bare binary');
assert.ok(fs.existsSync(binPath), 'Prebuilt binary executable file must exist on disk');

// 3. runtime throws error when target platform has no prebuilt binary
assert.throws(() => {
  runtime({ platform: 'nonexistent_platform', arch: 'unknown_arch' });
}, {
  message: /No binaries found for target 'nonexistent_platform-unknown_arch'/
}, 'Unsupported target platform/arch must throw error');

// 4. runtime throws error when specified referrer binary is missing
assert.throws(() => {
  runtime('nonexistent_referrer_module');
}, {
  message: /No binary found for target/
}, 'Missing referrer binary must throw error');

// 5. spawn sets executable permissions and spawns ChildProcess
const proc = spawn({ args: ['-v'] });
assert.ok(proc && typeof proc.on === 'function', 'spawn must return a ChildProcess instance');
assert.ok(proc.stdin && proc.stdout && proc.stderr, 'ChildProcess must have stdio streams');

let errored = false;
await new Promise((resolve) => {
  proc.on('error', (err) => {
    errored = true;
    // In environments lacking the host glibc dynamic linker (such as musl/Alpine test containers),
    // spawning a glibc-linked ELF binary correctly emits ENOENT
    assert.ok(err.code === 'ENOENT' || err.code === 'EACCES', `Expected ENOENT or EACCES, got ${err.code}`);
    resolve();
  });
  proc.on('close', (code) => {
    if (!errored) {
      assert.strictEqual(code, 0, 'On supported execution environments, bare -v exits with 0');
    }
    resolve();
  });
});

// 6. Verify CLI launcher script in bin/bare
const pkgDir = path.dirname(require.resolve('bare-runtime/package'));
const binBarePath = path.join(pkgDir, 'bin', 'bare');
assert.ok(fs.existsSync(binBarePath), 'bin/bare launcher must exist');
const binBareContent = fs.readFileSync(binBarePath, 'utf8');
assert.ok(binBareContent.includes("require('../lib/spawn')"), 'bin/bare must invoke lib/spawn');

console.log('Contract tests passed successfully.');