ComfyFactorio/maps/fish_defender_v2/vehicle_nanobots.lua

local Event = require 'utils.event'
local Public = require 'maps.fish_defender_v2.table'

local function on_player_changed_position(event)
    local vehicle_nanobots_unlocked = Public.get('vehicle_nanobots_unlocked')

    if not vehicle_nanobots_unlocked then
        return
    end
    local player = game.get_player(event.player_index)
    if not (player and player.valid) then
        return
    end

    if not player.character then
        return
    end

    if not player.character.driving then
        return
    end
    if not (player.vehicle and player.vehicle.valid) then
        return
    end

    if player.vehicle.health == player.vehicle.prototype.max_health then
        return
    end
    player.vehicle.health = player.vehicle.health + player.vehicle.prototype.max_health * 0.005
end

Event.add(defines.events.on_player_changed_position, on_player_changed_position)

return Public