miniflare.ts

const mf = new Miniflare({
  script: `
    export default {
      async fetch(request, env, ctx) {
        let id = env.DOO.idFromName('foo')
        return await env.DOO.get(id).fetch(request)
      }
    }

    const SECONDS = 1000

    export class Doo {
      constructor(state) {
        this.storage = state.storage
      }

      async fetch(request) {
        this.storage.setAlarm(Date.now() + 1 * SECONDS)
        return new Response('Hello Miniflare!')
      }

      async alarm() {
        console.log("Alarm running")
      }
    }
  `,
  durableObjects: { DOO: 'Doo' },
  log: new Log(),
  verbose: true,
  modules: true,
})

const response = await mf.dispatchFetch('http://localhost:8787/')
console.log(await response.text()) // Hello Miniflare!

Error message appears when the alarm is invoked, not when calling setAlarm

2024-02-26 17:24:48 workerd/io/worker-entrypoint.c++:561: warning: NOSENTRY Invalid alarm timeout value. Using 30 minutes; timeout = 0ns
2024-02-26 17:24:48 Alarm running