nEngine/mods/example-mod/index.mjs

export default {
  manifest: { id: "example-mod", version: "0.1.0" },
  hooks: {
    onDayStart(ctx) {
      ctx.emit("mod:example-day-start", {
        modId: "example-mod",
        day: ctx.time.get().day,
        season: ctx.time.get().season,
      });
    },
  },
};