--- @class EventBus
EventBus = {
    _handlers = {},
    new = function(self, o)
        o = o or {}
        setmetatable(o, self)
        self.__index = self
        return o
    end,
    ---
    ---@param self EventBus
    ---@param event any
    ---@param handler any
    ---@param index any
    on = function(self, event, handler, index)
        if not self._handlers[event] then self._handlers[event] = {} end
        self:off(event, handler)
        if not index then
            table.insert(self._handlers[event], handler)
        else
            -- insertIntoTable(this.handlers[event], handler, index)
        end
    end,
    ---
    ---@param self EventBus
    ---@param event any
    ---@param handler any
    off = function(self, event, handler)
        if not self._handlers[event] then return end
        self._handlers[event] = table.filter(self._handlers[event], function(o) return o ~= handler end)
    end,
    ---
    ---@param self EventBus
    ---@param event any
    ---@param ... unknown
    emit = function(self, event, ...)
        trace("[EventBus] Emitted " .. event)
        if not self._handlers[event] then return end
        for k, handler in pairs(self._handlers[event]) do
            handler(...)
        end
    end
}