Examples

Simple ESP

function onDraw()
        if Interfaces.Engine.IsInGame() then
                for k, index in pairs(Utils.GetEntitiesByClassID(40)) do
                        if not (index == Interfaces.Engine.GetLocalPlayer()) then
                                local entity = Interfaces.EntityList.GetClientEntity(index)
                                if entity:Exists() and not entity:Dormant() and entity:GetNetvarInt("DT_BasePlayer", "m_iHealth") > 0 then
                                    local box = entity:GetBox()
                                    Draw.OutlinedRect(Vec2(box.x, box.y), Vec2(box.z, box.w), entity:Enemy() and UI.GetConfigColor("simpleESP.EnemyColor") or UI.GetConfigColor("simpleESP.TeamColor"), Color(0, 0, 0, 100), 1)
                                end
                        end
                end
        end
end

function onUI()
    UI.AddColorPicker("Enemy", "simpleESP.EnemyColor")
    UI.AddColorPicker("Team", "simpleESP.TeamColor")
end

RegisterHook("Draw", "onDraw")
RegisterHook("UI", "onUI")

Chicken ESP

function onDraw()
    if Interfaces.Engine.IsInGame() then
                                                    -- Chicken's classid is 36
        for k, chickenIndex in pairs(Utils.GetEntitiesByClassID(36)) do
            local chickenEntity = Interfaces.EntityList.GetClientEntity(chickenIndex)
            if chickenEntity:Exists() and not chickenEntity:Dormant() then
                local box = chickenEntity:GetBox()
                Draw.CenteredOutlinedText(Vec2(box.x + ((box.z-box.x)//2), box.y - 14), Color(255, 255, 255, 255), Color(0, 0, 0, 255), "Chicken")
                Draw.OutlinedRect(Vec2(box.x, box.y), Vec2(box.z, box.w),  UI.GetConfigColor("chickenESP.Color"), Color(0, 0, 0, 255), 1)
            end
        end
    end
end

function onUI()
    UI.AddColorPicker("Chicken Color", "chickenESP.Color")
end

RegisterHook("UI", "onUI")
RegisterHook("Draw", "onDraw")

ESP Everything

Useful for getting classid's / network names of entities

function onDraw()
    if Interfaces.Engine.IsInGame() then
        for index=0, Interfaces.EntityList.GetHighestEntityIndex() do
            local entity = Interfaces.EntityList.GetClientEntity(index)
            if entity:Exists() then
                local box = entity:GetBox()
                Draw.Text(Vec2(box.x + ((box.z-box.x)//2), box.y - 14), Color(255, 255, 255, 255), entity:NetworkName() .. " (" .. entity:ClassID() .. ")")
                Draw.OutlinedRect(Vec2(box.x, box.y), Vec2(box.z, box.w), Color(255, 255, 255, 255), Color(0, 0, 0, 255), 1)
            end
        end
    end
end

RegisterHook("Draw", "onDraw")