Function resetNodeEnvironment

src/test/helpers.ts:243–278

()

 * Must also play nice with `nyc`'s environmental mutations.
 */
export function resetNodeEnvironment() {
  const sms =
    require('@cspotcode/source-map-support') as typeof import('@cspotcode/source-map-support');
  // We must uninstall so that it resets its internal state; otherwise it won't know it needs to reinstall in the next test.
  sms.uninstall();
  // Must remove handlers to avoid a memory leak
  sms.resetRetrieveHandlers();

  // Modified by ts-node hooks
  resetObject(
    require.extensions,
    defaultRequireExtensions,
    undefined,
    undefined,
    undefined,
    true
  );

  // ts-node attaches a property when it registers an instance
  // source-map-support monkey-patches the emit function
  // Avoid node deprecation warnings for setting process.config or accessing _channel
  resetObject(process, defaultProcess, undefined, ['_channel'], ['config']);

  // source-map-support swaps out the prepareStackTrace function
  resetObject(Error, defaultError);

  // _resolveFilename et.al. are modified by ts-node, tsconfig-paths, source-map-support, yarn, maybe other things?
  resetObject(require('module'), defaultModule, undefined, ['wrap', 'wrapper']);

  // May be modified by REPL tests, since the REPL sets globals.
  // Avoid deleting nyc's coverage data.
  resetObject(global, defaultGlobal, ['__coverage__']);

  // Reset our ESM hooks
  process.__test_setloader__?.(undefined);
}

function captureObjectState(object: any, avoidGetters: string[] = []) {
  const descriptors = Object.getOwnPropertyDescriptors(object);