How to handle a Signal in TypeScript

setHandler

TypeScript

import { setHandler } from '@temporalio/workflow';

export async function yourWorkflow() {
  const groups = new Map<string, Set<string>>();

  setHandler(joinSignal, ({ userId, groupId }: JoinInput) => {
    const group = groups.get(groupId);
    if (group) {
      group.add(userId);
    } else {
      groups.set(groupId, new Set([userId]));
    }
  });
}

JavaScript

import { setHandler } from '@temporalio/workflow';

export async function yourWorkflow() {
  const groups = new Map();
  
  setHandler(joinSignal, ({ userId, groupId }) => {
    const group = groups.get(groupId);
    if (group) {
      group.add(userId);
    }
    else {
      groups.set(groupId, new Set([userId]));
    }
  });
}