Internal: Result of job is invalid json (empty)

Unexpected error during job execution:
Object {
    "message": String("Internal: Result of job is invalid json (empty)"),
    "name": String("InternalErr"),
}

Unexpected error during job execution:
Object {
    "message": String("Internal: Result of job is invalid json (empty)"),
    "name": String("InternalErr"),
}

import { WebClient } from "@slack/web-api";

type Slack = {
  token: string;
};

export async function main(
  slack: Slack,
  channel: string,
  message: string,
) {
  const web = new WebClient(slack.token);
  await web.chat.postMessage({
    channel,
    text: message,
  });
  return { channel, message };
}

import { WebClient } from "@slack/web-api";

type Slack = {
  token: string;
};

export async function main(
  slack: Slack,
  channel: string,
  message: string,
) {
  const web = new WebClient(slack.token);
  await web.chat.postMessage({
    channel,
    text: message,
  });
  return { channel, message };
}