Function runEnvOutside

test/parallel/test-icu-env.js:46–52

(addEnv, code, ...args)

function runEnvOutside(addEnv, code, ...args) {
  return execFileSync(
    process.execPath,
    ['-e', `process.stdout.write(String(${code}));`],
    { env: { ...process.env, ...addEnv }, encoding: 'utf8' }
  );
}

function runEnvInside(addEnv, func, ...args) {
  Object.assign(process.env, addEnv); // side effects!