HasTileAtWorldXY = function (worldX, worldY, camera, layer)
{
    layer.tilemapLayer.worldToTileXY(worldX, worldY, true, point, camera);

    var tileX = point.x;
    var tileY = point.y;

    return HasTileAt(tileX, tileY, layer);
}
Checks if there is a tile at the given location (in world coordinates) in the given layer. Returns
false if there is no tile or if the tile at that location has an index of -1.

@function Phaser.Tilemaps.Components.HasTileAtWorldXY
@since 3.0.0

@param {number} worldX - The X coordinate of the world position.
@param {number} worldY - The Y coordinate of the world position.
@param {Phaser.Cameras.Scene2D.Camera} camera - The Camera to use when factoring in which tiles to return.
@param {Phaser.Tilemaps.LayerData} layer - The Tilemap Layer to act upon.

@return {?boolean} Returns a boolean, or null if the layer given was invalid.