cesiumDemo/Source/Scene/Cesium3DTileContentState.js

import freezeObject from '../Core/freezeObject.js';

    /**
     * @private
     */
    var Cesium3DTileContentState = {
        UNLOADED : 0,   // Has never been requested
        LOADING : 1,    // Is waiting on a pending request
        PROCESSING : 2, // Request received.  Contents are being processed for rendering.  Depending on the content, it might make its own requests for external data.
        READY : 3,      // Ready to render.
        EXPIRED : 4,    // Is expired and will be unloaded once new content is loaded.
        FAILED : 5      // Request failed.
    };
export default freezeObject(Cesium3DTileContentState);