Continue-As-New - TypeScript SDK

Continue-As-New enables a Workflow Execution to close successfully and create a new Workflow Execution in a single atomic operation if the number of Events in the Event History is becoming too large. The Workflow Execution spawned from the use of Continue-As-New has the same Workflow Id, a new Run Id, and a fresh Event History and is passed all the appropriate parameters.

To cause a Workflow Execution to Continue-As-New, the Workflow function should return the result of the continueAsNew.

continue-as-new/src/workflows.ts

import { continueAsNew, log, sleep } from '@temporalio/workflow';

export async function loopingWorkflow(iteration = 0): Promise<void> {
  if (iteration === 10) {
    return;
  }
  log.info('Running Workflow iteration', { iteration });
  await sleep(1000);
  // Must match the arguments expected by `loopingWorkflow`
  await continueAsNew<typeof loopingWorkflow>(iteration + 1);
  // Unreachable code, continueAsNew is like `process.exit` and will stop execution once called.
}

Using Continue-as-New and Updates

• Temporal does not support Continue-as-New functionality within Update handlers.
• Complete all handlers before using Continue-as-New.
• Use Continue-as-New from your main Workflow Definition method, just as you would complete or fail a Workflow Execution.