Function withRestoredEnv

packages/cli/src/commands/lint.ts:55–70

* Run `fn` with a snapshot of `process.env` taken beforehand, restoring the original environment * afterwards (even if `fn` throws). Linting loads `.env` via `dotenv.config` and injects generated * integration env vars into `process.env`; without this a lint run would permanently mutate the * pro

(fn: () => Promise<T>)

 * was reported missing would silently start passing) and clobbering caller-provided env values.
 */
async function withRestoredEnv<T>(fn: () => Promise<T>): Promise<T> {
  const originalEnv = { ...process.env }
  try {
    return await fn()
  } finally {
    // Reset to the snapshot: delete keys added during the run, then restore originals. Assigning
    // `process.env = originalEnv` would replace the live env object some libraries hold a reference
    // to, so mutate the existing object in place instead.
    for (const key of Object.keys(process.env)) {
      if (!(key in originalEnv)) {
        delete process.env[key]
      }
    }
    Object.assign(process.env, originalEnv)
  }
}

/**
 * Derive a stable, snake_case issue code from an error's class name.