diff --git a/coordinator/iocontrol.lua b/coordinator/iocontrol.lua
index e26546d..60444f6 100644
--- a/coordinator/iocontrol.lua
+++ b/coordinator/iocontrol.lua
@@ -18,11 +18,15 @@ local iocontrol = {}
 ---@class ioctl
 local io = {}
 
+-- luacheck push ignore
+
 -- placeholder acknowledge function for type hinting
 ---@param success boolean
 ---@diagnostic disable-next-line: unused-local
 local function __generic_ack(success) end
 
+-- luacheck pop
+
 -- initialize the coordinator IO controller
 ---@param conf facility_conf configuration
 ---@param comms coord_comms comms reference
diff --git a/graphics/elements/controls/hazard_button.lua b/graphics/elements/controls/hazard_button.lua
index e9f2bf4..2b9baa6 100644
--- a/graphics/elements/controls/hazard_button.lua
+++ b/graphics/elements/controls/hazard_button.lua
@@ -141,9 +141,7 @@ local function hazard_button(args)
     end
 
     -- handle mouse interaction
-    ---@param event mouse_interaction mouse event
----@diagnostic disable-next-line: unused-local
-    function e.handle_mouse(event)
+    function e.handle_mouse(_)
         if e.enabled then
             -- change text color to indicate clicked
             e.window.setTextColor(args.accent)
diff --git a/graphics/elements/controls/push_button.lua b/graphics/elements/controls/push_button.lua
index d0c1299..9b5f971 100644
--- a/graphics/elements/controls/push_button.lua
+++ b/graphics/elements/controls/push_button.lua
@@ -48,9 +48,7 @@ local function push_button(args)
     end
 
     -- handle mouse interaction
-    ---@param event mouse_interaction mouse event
----@diagnostic disable-next-line: unused-local
-    function e.handle_mouse(event)
+    function e.handle_mouse(_)
         if e.enabled then
             if args.active_fg_bg ~= nil then
                 -- show as pressed
diff --git a/graphics/elements/controls/switch_button.lua b/graphics/elements/controls/switch_button.lua
index 133ea45..012872c 100644
--- a/graphics/elements/controls/switch_button.lua
+++ b/graphics/elements/controls/switch_button.lua
@@ -63,9 +63,7 @@ local function switch_button(args)
     draw_state()
 
     -- handle mouse interaction
-    ---@param event mouse_interaction mouse event
----@diagnostic disable-next-line: unused-local
-    function e.handle_mouse(event)
+    function e.handle_mouse(_)
         if e.enabled then
             -- toggle state
             e.value = not e.value
diff --git a/scada-common/util.lua b/scada-common/util.lua
index 5f2f34b..315f8cb 100644
--- a/scada-common/util.lua
+++ b/scada-common/util.lua
@@ -113,6 +113,8 @@ end
 ---@return table lines
 function util.strwrap(str, limit) return cc_strings.wrap(str, limit) end
 
+-- luacheck push no unused varargs
+
 -- concatenation with built-in to string
 ---@nodiscard
 ---@vararg any
@@ -136,6 +138,8 @@ function util.sprintf(format, ...)
     return string.format(format, table.unpack(arg))
 end
 
+-- luacheck pop
+
 -- format a number string with commas as the thousands separator<br>
 -- subtracts from spaces at the start if present for each comma used
 ---@nodiscard