Retrieve output from multiple runs via `batch.triggerByTaskAndWait`

[deft hull]

Hi @balmy dagger. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:

---

You can get the outputs directly from batch.triggerByTaskAndWait without extra API calls.

The function returns an object with a runs array where each item includes ok, output, error, taskIdentifier, etc. You can either index into that array or destructure it:

import { batch, task } from "@trigger.dev/sdk";

export const parentTask = task({
  id: "parent-task",
  run: async () => {
    const { runs } = await batch.triggerByTaskAndWait([
      { task: childTask1, payload: { foo: "World" } },
      { task: childTask2, payload: { bar: 42 } },
    ]);

    if (runs[0].ok) {
      // typed as childTask1's return type
      console.log("Child task 1 output", runs[0].output);
    }

    if (runs[1].ok) {
      // typed as childTask2's return type
      console.log("Child task 2 output", runs[1].output);
    }
  },
});

export const childTask1 = task({
  id: "child-task-1",
  run: async (payload: { foo: string }) => {
    return `Hello ${payload.foo}`;
  },
});

export const childTask2 = task({
  id: "child-task-2",
  run: async (payload: { bar: number }) => {
    return payload.bar + 1;
  },
});

You can also use destructuring for clearer typing:

const {
  runs: [run1, run2],
} = await batch.triggerByTaskAndWait([
  { task: childTask1, payload: { foo: "World" } },
  { task: childTask2, payload: { bar: 42 } },
]);

if (run1.ok) console.log(run1.output);
if (run2.ok) console.log(run2.output);

This pattern gives you all outputs in one call, so you don’t need additional runs.retrieve requests for a typical batch fan‑out/fan‑in flow. [batch triggerByTaskAndWait]

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

@balmy dagger Kapa.ai is still learning and improving, please let me know how I did by reacting below.