node/lib/internal/modules/esm/handle_process_exit.js

'use strict';

const { exitCodes: { kUnfinishedTopLevelAwait } } = internalBinding('errors');

/**
 * Handle a Promise from running code that potentially does Top-Level Await.
 * In that case, it makes sense to set the exit code to a specific non-zero value
 * if the main code never finishes running.
 */
function handleProcessExit() {
  process.exitCode ??= kUnfinishedTopLevelAwait;
}

module.exports = {
  handleProcessExit,
};