Make some global vars local

mods/default/furnace.lua

@@ -123,7 +123,7 @@ minetest.register_node(
 		end,
    })
 
-function swap_node(pos, name)
+local function swap_node(pos, name)
    local node = minetest.get_node(pos)
    if node.name == name then
       return

mods/mobs/api.lua

@@ -1358,7 +1358,7 @@ function mobs:register_spawn(name, nodes, max_light, min_light, chance, active_o
 end
 
 -- particle effects
-function effect(pos, amount, texture, max_size)
+local function effect(pos, amount, texture, max_size)
    minetest.add_particlespawner(
       {
          amount = amount,
@@ -1378,7 +1378,7 @@ function effect(pos, amount, texture, max_size)
 end
 
 -- on mob death drop items
-function check_for_death(self, hitter)
+local function check_for_death(self, hitter)
    local hp = self.object:get_hp()
    if hp > 0 then
       self.health = hp
@@ -1423,7 +1423,7 @@ function check_for_death(self, hitter)
 end
 
 -- from TNT mod
-function calc_velocity(pos1, pos2, old_vel, power)
+local function calc_velocity(pos1, pos2, old_vel, power)
    local vel = vector.direction(pos1, pos2)
    vel = vector.normalize(vel)
    vel = vector.multiply(vel, power)
@@ -1435,7 +1435,7 @@ function calc_velocity(pos1, pos2, old_vel, power)
 end
 
 -- modified from TNT mod
-function entity_physics(pos, radius)
+local function entity_physics(pos, radius)
    radius = radius * 2
    local objs = minetest.get_objects_inside_radius(pos, radius)
    local obj_pos, obj_vel, dist

mods/music/init.lua

@@ -120,7 +120,7 @@ if minetest.settings:get_bool("music_enable") then
 	 groups = {oddly_breakable_by_hand = 3}
    })
 
-   function step(dtime)
+   local function step(dtime)
       for dp, _ in pairs(music.players) do
 	 music.players[dp]["timer"] = music.players[dp]["timer"] + dtime
 

mods/nav/compass.lua

@@ -7,7 +7,7 @@ local S = minetest.get_translator("nav")
 local wield_image_0 = "nav_compass_inventory_0.png"
 local wield_image_1 = "nav_compass_inventory_1.png"
 
-function on_globalstep(dtime)
+local function on_globalstep(dtime)
    for _, player in pairs(minetest.get_connected_players()) do
       local inv = player:get_inventory()
 

mods/parachute/init.lua

@@ -7,7 +7,7 @@
 
 local S = minetest.get_translator("parachute")
 
-function air_physics(v)
+local function air_physics(v)
    local m = 80    -- Weight of player, kg
    local g = -9.81 -- Earth Acceleration, m/s^2
    local cw = 1.25 -- Drag coefficient

mods/weather/init.lua

@@ -61,7 +61,7 @@ local function play_sound()
    minetest.after(3, play_sound)
 end
 
-function setweather_type(type)
+local function setweather_type(type)
    local valid = false
    for i = 1, #weather.types do
       if weather.types[i] == type then