Extract type from activity failure

How can I extract the type of an activity failure? So I have a workflow that does this:

export const workflow = async params => {
  try {
    const result = await activityA(params);
    return await activityB(result);
  } catch (err) {
    if (err) {
      await handleActivityFailure(err as Error);
    throw err;

with my activities throwing errors via:

    throw ApplicationFailure.nonRetryable('Error found', 'errorA' ); 

In that line where I have if (err), I’d actually like to retrieve and check the type of error being thrown (I’d like to only call handleActivityFailure if the activity type is of type errorA).

What’s the best way to do so? When I print out what the value of err is, I get, which seems like a really weird object being returned?

[activityA(aec6094f-c8cb-4bda-9bc5-2d79633272dc)] [ActivityFailure: Activity execution failed] {
  cause: ApplicationFailure: Error found 
      at Function.nonRetryable 
      at activityA[as fn]  {
    cause: undefined,
    type: 'THING_I_WANT_TO_GET',
    nonRetryable: true,
    details: [],
    failure: Failure {
      message: 'Error found ',
      source: 'TypeScriptSDK',
      stackTrace: 'ApplicationFailure: Error found \n' +
  activityType: 'activityA',
  activityId: '3',
  retryState: 2,
  identity: '55703@ip-192-168-1-162.us-west-2.compute.internal',
  failure: Failure {
    message: 'Activity task failed',
    cause: Failure {
      message: 'Error found',
      source: 'TypeScriptSDK',
      stackTrace: '',
      applicationFailureInfo: [ApplicationFailureInfo]
    activityFailureInfo: ActivityFailureInfo {
      scheduledEventId: [Long],
      startedEventId: [Long],
      identity: '55703@ip-192-168-1-162.us-west-2.compute.internal',
      activityType: [ActivityType],
      activityId: '3',
      retryState: 2

Figured out that it’s done via err.cause.type