How to get the result of a Workflow execution in TypeScript

To return the results of a Workflow Execution:

return (
  'Completed ' +
  wf.workflowInfo().workflowId +
  ', Total Charged: ' +
  totalCharged
);

totalCharged is just a function declared in your code. For a full example, see subscription-workflow-project-template-typescript/src/workflows.ts.

A Workflow function may return a result. If it doesn’t (in which case the return type is Promise<void>), the result will be undefined.

If you started a Workflow with handle.start(), you can choose to wait for the result anytime with handle.result().

const handle = client.getHandle(workflowId);
const result = await handle.result();

Using a Workflow Handle isn't necessary with client.execute().

Workflows that prematurely end will throw a WorkflowFailedError if you call result().

If you call result() on a Workflow that prematurely ended for some reason, it throws a WorkflowFailedError error that reflects the reason. For that reason, it is recommended to catch that error.

const handle = client.getHandle(workflowId);
try {
  const result = await handle.result();
} catch (err) {
  if (err instanceof WorkflowFailedError) {
    throw new Error('Temporal workflow failed: ' + workflowId, {
      cause: err,
    });
  } else {
    throw new Error('error from Temporal workflow ' + workflowId, {
      cause: err,
    });
  }
}