Function emit

packages/effect/src/unstable/workers/Worker.ts:206–216

(data: PlatformMessage)

                  port,
                  scope,
                  emit(data: PlatformMessage) {
                    if (data[0] === 0) {
                      if (opts?.onSpawn) {
                        run(Effect.ensuring(opts.onSpawn, ready.open))
                      } else {
                        ready.openUnsafe()
                      }
                      return
                    }
                    run(handler(data[1] as O))
                  },
                  deferred: fiberSet.deferred as any
                })
                yield* ready.await