local WeakSet
do
    WeakSet = __TS__Class()
    WeakSet.name = "WeakSet"
    function WeakSet.prototype.____constructor(self, values)
        self[Symbol.toStringTag] = "WeakSet"
        self.items = {}
        setmetatable(self.items, {__mode = "k"})
        if values == nil then
            return
        end
        local iterable = values
        if iterable[Symbol.iterator] then
            local iterator = iterable[Symbol.iterator](iterable)
            while true do
                local result = iterator:next()
                if result.done then
                    break
                end
                self.items[result.value] = true
            end
        else
            for ____, value in ipairs(values) do
                self.items[value] = true
            end
        end
    end
    function WeakSet.prototype.add(self, value)
        self.items[value] = true
        return self
    end
    function WeakSet.prototype.delete(self, value)
        local contains = self:has(value)
        self.items[value] = nil
        return contains
    end
    function WeakSet.prototype.has(self, value)
        return self.items[value] == true
    end
    WeakSet[Symbol.species] = WeakSet
end