pixel-editor/js/data/consts.js

const MIN_Z_INDEX = -5000;
const MAX_Z_INDEX = 5000;

// Index of the first layer the user can use in the layers array
const firstUserLayerIndex = 2;
// Number of layers that are only used by the editor
const nAppLayers = 3;

const MIN_ZOOM_LEVEL = 0.5;