/**
 * @description KnowledgeBase Class.
 *
 * @deprecated since version 3.0.0
 * @class KnowledgeBase
 * @memberof jibo.kb
 */

/** The Knowledge Base API.
 *
 * Can be accessed via `jibo.kb` (or `import {kb} from 'jibo'`).
 *
 * @namespace jibo.kb
 *
 * @example
 * let model = jibo.kb.createModel('/skillname');
 *
 */

    /**
     * Loop model information.
     * @name jibo.kb#loop
     * @type {jibo.kb.loop.LoopModel}
     */

    /**
     * Media list model information.
     * @name jibo.kb#media
     * @type {jibo.kb.media.MediaModel}
     */

    /**
     * Robot properties model information.
     * @name jibo.kb#robot
     * @type {jibo.kb.robot.RobotModel}
     */

    /** Create an Error with a good message from an AxiosError object
     *
     * @method jibo.kb.KnowledgeBase#_processError
     * @param {AxiosError} err Axios error object.
     * @returns {Error} Error object.
     * @private
     */

    /** Create a KB slice. KB slices must be created before they are
     * used the first time. This method creates the KB slice, or does
     * nothing if it has already been created. The callback is
     * supplied with a boolen indicating if the slice needed to be
     * created. If callback is omitted a promise is returned instead.
     *
     * @method jibo.kb#createSlice
     * @param {string} sliceName Name of KB slice to create.
     * KB name must start with a `/`, followed by the skill name.
     * @param {string} [httpUrl] Base URL of KB service. Defaults to
     * URL generated from the service object given to `init()`.
     * @param {Function} [callback] Called with `(err, created)`
     * arguments. `created` is `false` if the KB slice already
     * existed. If callback is omitted a promise that returns
     * `created` is returned instead.
     * @returns {Promise} A promise that resolves with the value of
     * `created` if the callback is omitted.
     */

    /** Check if a KB slice exists. The callback is supplied with a
     * boolen indicating if the slice exists. If callback is omitted a
     * promise is returned instead.
     *
     * @method jibo.kb#existsSlice
     * @param {string} sliceName Name of KB slice to check.
     * KB name must start with a `/`, followed by the skill name.
     * @param {string} [httpUrl] Base URL of KB service. Defaults to
     * URL generated from the service object given to `init()`.
     * @param {Function} [callback] Called with `(err, exists)`
     * arguments. `exists` is `true` if the KB slice exists. If
     * callback is omitted a promise that returns `exists` is returned
     * instead.
     * @returns {Promise} A promise that resolves with the value of
     * `exists` if the callback is omitted.
     */

    /** Create a new Model object. Models are the primary interface
     * to the knowledge base.
     *
     * @method jibo.kb#createModel
     * @param {string|string[]} kbNames Array of knowledge base slice
     * names to include in model, in order of precedence. A single
     * KB name can be given as a string instead of an array of strings.
     * KB names must start with a `/`, followed by the skill name.
     * @param {string} [httpUrl] Base URL of KB.
     * service. Defaults to URL generated from the service object
     * given to `init()`.
     * @param {string} [httpUrl] Base URL of KB service. Defaults to
     * URL generated from the service object given to `init()`.
     * @returns {jibo.kb.Model} New Model object.
     */

    /** Register a Node subclass to be instantiated when a node of a
     * given type is loaded or created.
     *
     * @method jibo.kb#registerNodeClass
     * @param {string|string[]} nodeType Node type to use this
     * subclass for.
     * @param {Function} classConstruction The constructor function
     * for the subclass.
     * @param {string} [kbName] Name of KB to limit the use
     * of this subclass to. Defaults to all KBs.
     */

    /** Register a Model subclass to be instantiated for a given KB name
     * list.
     *
     * @method jibo.kb#registerModelClass
     * @param {string|string[]} kbNames KB name or name list use this
     * subclass for.
     * @param {Function} classConstructor The constructor function for
     * the subclass.
     */

    /** Use the node type to find a Node subclass in the Node Class
     * registry. Default to the plain `Node` object if nothing
     * matches.
     *
     * @method jibo.kb#findNodeClass
     * @param {string} nodeType Type of node.
     * @param {string} kbName Name of KB slice.
     * @returns {Function} Node class constructor.
     */

    /** Use the given KB slice names to find a Model subclass in the
     * Model subclass registry. Defaults to the plain `Model` object
     * if nothing matches.
     *
     * @method jibo.kb#findModelClass
     * @param {string|string[]} kbNames Array of knowledge base slice
     * names.
     * @returns {Function} Model class constructor.
     */

    /** Unload a given kb slice from the Skills Service Manager memory
     * and remove it from disk.  Also removes any sub-kbs inside this
     * slice. For example, if you remove `/jibo`, that would also
     * remove `/jibo/loop`, `/jibo/settings` and all other kb slices
     * under `/jibo`. If callback is omitted a promise is returned
     * instead.
     *
     * @method jibo.kb#removeSlice
     * @param {string} sliceName Name of kb slice to be removed,
     * including all of its sub-slices (if any).
     * @param {Function} [callback] Called when done, with `err`
     * parameter if there was an error. If callback is omitted a
     * promise is returned instead.
     * @returns {Promise} A promise if the callback is omitted.
     */

    /** Convert a single item to an array for arguments that may be a
     * single thing or an array of things.
     *
     * @method jibo.kb#_toArray
     * @private
     */