JavaScript questions that don't deserve their own thread

enum Months 
{
    January,
    February,
    March
};

const January = 0, February = 1, March = 2;

BattleManager.initMembers = function()
{
    this._January = 0;
    this._February = 1;
    this._March = 2;
etc.

public struct MazeData

{

    public string MazeName;

    public Vector2Int MazeSize;

    public bool LoopVertically;

    public bool LoopHorizontally;

    public List<MazeRoom> MazeRooms; //maze room is one of the other 2 structs in this system

    public int DefaultRooms;

    public MazeRoom[,] MazeLayout; //2d array of the maze

    public List<MazeConnection> MazeConnections; //maze connection is one of the other 2 structs in this system

    public List<MazeRoom> RoomsUnplaced;

    public List<MazeRoom> RoomsPlaced;

    public int MazeRem;

}

//-----------------------------------------------------------------------------
// Maze_Data
//
// The object holding the main data for a maze

function Maze_Data() {
    this.initialize(...arguments);
}

Maze_Data.prototype.initialize = function() {
    this._name = "test";
    this._mapID = arguments.mapId; //I know rpgmaker maps have a map id, need to get that somehow...
    this._mazeWidth = 0; //i am pretty sure javascript does not have vector2?
    this._mazeHeight = 0;
    this._loopVertically = false;
    this._loopHorizontally = false;
    this._mazeRooms = [];
    this._DefaultRoom = 0;
    this._MazeLayout = [this._mazeWidth, this._mazeHeight]; //am unsure if this is how a 2d array is made or not
    this._MazeConnections = [];
    this._RoomsUnplaced = [];
    this._RoomsPlaced = [];

    this._MazeRem = 0;
};

Game_Enemy.prototype.getLevel = function(){
    if(Imported.Eli_EnemyClass && this._classId > 0){
        return this.getLevelByClass()
    }else{
        return this.getLevelByMeta()
    }
}

Game_Enemy.prototype.getLevel = function(){
    const meta = this.enemy().meta

    if(meta.hasOwnProperty('OverrideXPLevel')){
        return Number(Eli.Utils.convertEscapeVariablesOnly(meta.OverrideXPLevel))
    }else{
        return this.level
    }
}

var Test = Test || {};
Test.pluginName = "Test";
Test.parameters = PluginManager.parameters(Test.pluginName);

Test.DataBaseLoaded = DataManager.isDatabaseLoaded;

DataManager.isDatabaseLoaded = function() {
    Test.DataBaseLoaded.apply(this,arguments)
};

var Test = Test || {};
Test.DataBaseLoaded = DataManager.isDatabaseLoaded;
DataManager.isDatabaseLoaded = function() {
    if (!Test.DataBaseLoaded.call(this)) return false;
    if (!Test._loaded) {
        console.log($dataEnemies); //do stuff here
        Test._loaded = true;
    }
    return true;
};