{
  "version": 3,
  "sources": ["../../../../../node_modules/.pnpm/dagre-d3-es@7.0.14/node_modules/dagre-d3-es/src/graphlib/graph.js"],
  "sourcesContent": ["import * as _ from 'lodash-es';\n\nvar DEFAULT_EDGE_NAME = '\\x00';\nvar GRAPH_NODE = '\\x00';\nvar EDGE_KEY_DELIM = '\\x01';\n\n/**\n * @typedef {string} NodeID ID of a node.\n */\n\n/**\n * @typedef {`${string}${typeof EDGE_KEY_DELIM}${string}${typeof EDGE_KEY_DELIM}${string}`} EdgeID ID of an edge.\n * @internal - All public APIs use {@link EdgeObj} instead to refer to edges.\n */\n\n/**\n * @typedef {object} EdgeObj\n * @property {NodeID} v the id of the source or tail node of an edge\n * @property {NodeID} w the id of the target or head node of an edge\n * @property {string | number} [name] Name of the edge. Needed to uniquely identify\n * multiple edges between the same pair of nodes in a multigraph.\n */\n\n/**\n * @template {unknown} T\n * @typedef {T[] | Record<any, T>} Collection\n * Lodash object that can be iterated over with `_.each`.\n *\n * Beware, objects with `.length` are treated as arrays, see\n * https://lodash.com/docs/4.17.15#forEach\n */\n\n// Implementation notes:\n//\n//  * Node id query functions should return string ids for the nodes\n//  * Edge id query functions should return an \"edgeObj\", edge object, that is\n//    composed of enough information to uniquely identify an edge: {v, w, name}.\n//  * Internally we use an \"edgeId\", a stringified form of the edgeObj, to\n//    reference edges. This is because we need a performant way to look these\n//    edges up and, object properties, which have string keys, are the closest\n//    we're going to get to a performant hashtable in JavaScript.\n\n// Implementation notes:\n//\n//  * Node id query functions should return string ids for the nodes\n//  * Edge id query functions should return an \"edgeObj\", edge object, that is\n//    composed of enough information to uniquely identify an edge: {v, w, name}.\n//  * Internally we use an \"edgeId\", a stringified form of the edgeObj, to\n//    reference edges. This is because we need a performant way to look these\n//    edges up and, object properties, which have string keys, are the closest\n//    we're going to get to a performant hashtable in JavaScript.\n\n/**\n * @typedef {object} GraphOptions\n * @property {boolean | undefined} [directed] - set to `true` to get a\n * directed graph and `false` to get an undirected graph.\n * An undirected graph does not treat the order of nodes in an edge as\n * significant.\n * In other words, `g.edge(\"a\", \"b\") === g.edge(\"b\", \"a\")` for\n * an undirected graph.\n * Default: `true`\n * @property {boolean | undefined} [multigraph] - set to `true` to allow a\n * graph to have multiple edges between the same pair of nodes.\n * Default: `false`.\n * @property {boolean | undefined} [compound] - set to `true` to allow a\n * graph to have compound nodes - nodes which can be the parent of other\n * nodes.\n * Default: `false`.\n */\n\n/**\n * Graphlib has a single graph type: {@link Graph}. To create a new instance:\n *\n * ```js\n * var g = new Graph();\n * ```\n *\n * By default this will create a directed graph that does not allow multi-edges\n * or compound nodes.\n * The following options can be used when constructing a new graph:\n *\n * * {@link GraphOptions#directed}: set to `true` to get a directed graph and `false` to get an\n *   undirected graph.\n *   An undirected graph does not treat the order of nodes in an edge as\n *   significant. In other words,\n *   `g.edge(\"a\", \"b\") === g.edge(\"b\", \"a\")` for an undirected graph.\n *   Default: `true`.\n * * {@link GraphOptions#multigraph}: set to `true` to allow a graph to have multiple edges\n *   between the same pair of nodes. Default: `false`.\n * * {@link GraphOptions#compound}: set to `true` to allow a graph to have compound nodes -\n *   nodes which can be the parent of other nodes. Default: `false`.\n *\n * To set the options, pass in an options object to the `Graph` constructor.\n * For example, to create a directed compound multigraph:\n *\n * ```js\n * var g = new Graph({ directed: true, compound: true, multigraph: true });\n * ```\n *\n * ### Node and Edge Representation\n *\n * In graphlib, a node is represented by a user-supplied String id.\n * All node related functions use this String id as a way to uniquely identify\n * the node. Here is an example of interacting with nodes:\n *\n * ```js\n * var g = new Graph();\n * g.setNode(\"my-id\", \"my-label\");\n * g.node(\"my-id\"); // returns \"my-label\"\n * ```\n *\n * Edges in graphlib are identified by the nodes they connect. For example:\n *\n * ```js\n * var g = new Graph();\n * g.setEdge(\"source\", \"target\", \"my-label\");\n * g.edge(\"source\", \"target\"); // returns \"my-label\"\n * ```\n *\n * However, we need a way to uniquely identify an edge in a single object for\n * various edge queries (e.g. {@link Graph#outEdges}).\n * We use {@link EdgeObj}s for this purpose.\n * They consist of the following properties:\n *\n * * {@link EdgeObj#v}: the id of the source or tail node of an edge\n * * {@link EdgeObj#w}: the id of the target or head node of an edge\n * * {@link EdgeObj#name} (optional): the name that uniquely identifies a multiedge.\n *\n * Any edge function that takes an edge id will also work with an {@link EdgeObj}. For example:\n *\n * ```js\n * var g = new Graph();\n * g.setEdge(\"source\", \"target\", \"my-label\");\n * g.edge({ v: \"source\", w: \"target\" }); // returns \"my-label\"\n * ```\n *\n * ### Multigraphs\n *\n * A [multigraph](https://en.wikipedia.org/wiki/Multigraph) is a graph that can\n * have more than one edge between the same pair of nodes.\n * By default graphlib graphs are not multigraphs, but a multigraph can be\n * constructed by setting the {@link GraphOptions#multigraph} property to true:\n *\n * ```js\n * var g = new Graph({ multigraph: true });\n * ```\n *\n * With multiple edges between two nodes we need some way to uniquely identify\n * each edge. We call this the {@link EdgeObj#name} property.\n * Here's an example of creating a couple of edges between the same nodes:\n *\n * ```js\n * var g = new Graph({ multigraph: true });\n * g.setEdge(\"a\", \"b\", \"edge1-label\", \"edge1\");\n * g.setEdge(\"a\", \"b\", \"edge2-label\", \"edge2\");\n * g.edge(\"a\", \"b\", \"edge1\"); // returns \"edge1-label\"\n * g.edge(\"a\", \"b\", \"edge2\"); // returns \"edge2-label\"\n * g.edges(); // returns [{ v: \"a\", w: \"b\", name: \"edge1\" },\n *            //          { v: \"a\", w: \"b\", name: \"edge2\" }]\n * ```\n *\n * A multigraph still allows an edge with no name to be created:\n *\n * ```js\n * var g = new Graph({ multigraph: true });\n * g.setEdge(\"a\", \"b\", \"my-label\");\n * g.edge({ v: \"a\", w: \"b\" }); // returns \"my-label\"\n * ```\n *\n * ### Compound Graphs\n *\n * A compound graph is one where a node can be the parent of other nodes.\n * The child nodes form a \"subgraph\".\n * Here's an example of constructing and interacting with a compound graph:\n *\n * ```js\n * var g = new Graph({ compound: true });\n * g.setParent(\"a\", \"parent\");\n * g.setParent(\"b\", \"parent\");\n * g.parent(\"a\");      // returns \"parent\"\n * g.parent(\"b\");      // returns \"parent\"\n * g.parent(\"parent\"); // returns undefined\n * ```\n *\n * ### Default Labels\n *\n * When a node or edge is created without a label, a default label can be assigned.\n * See {@link setDefaultNodeLabel} and {@link setDefaultEdgeLabel}.\n *\n * @template [GraphLabel=any] - Label of the graph.\n * @template [NodeLabel=any] - Label of a node.\n * Even though this is a \"label\", this could be any type that the user requires\n * (and may need to be an object for some layout/ranking algorithms in dagre).\n * @template [EdgeLabel=any] - Label of an edge.\n * Even though this is a \"label\", this could be any type that the user requires,\n * (and may need to be a object for ranking in dagre).\n */\nexport class Graph {\n  /**\n   * @param {GraphOptions} [opts] - Graph options.\n   */\n  constructor(opts = {}) {\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this._isDirected = Object.prototype.hasOwnProperty.call(opts, 'directed')\n      ? opts.directed\n      : true;\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this._isMultigraph = Object.prototype.hasOwnProperty.call(opts, 'multigraph')\n      ? opts.multigraph\n      : false;\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this._isCompound = Object.prototype.hasOwnProperty.call(opts, 'compound')\n      ? opts.compound\n      : false;\n\n    /**\n     * @type {GraphLabel | undefined}\n     * Label for the graph itself\n     */\n    this._label = undefined;\n\n    /**\n     * Default label to be set when creating a new node.\n     *\n     * @private\n     * @type {(v: NodeID | number) => NodeLabel}\n     */\n    this._defaultNodeLabelFn = _.constant(undefined);\n\n    /**\n     * Default label to be set when creating a new edge\n     *\n     * @private\n     * @type {(v: NodeID, w: NodeID, name: string | undefined) => EdgeLabel}\n     */\n    this._defaultEdgeLabelFn = _.constant(undefined);\n\n    /**\n     * @type {Record<NodeID, NodeLabel>}\n     * @private\n     *\n     * v -> label\n     */\n    this._nodes = {};\n\n    if (this._isCompound) {\n      /**\n       * @type {Record<NodeID, NodeID>}\n       * @private\n       * v -> parent\n       */\n      this._parent = {};\n\n      /**\n       * @type {Record<NodeID, Record<NodeID, true>>}\n       * @private\n       * v -> children\n       */\n      this._children = {};\n      this._children[GRAPH_NODE] = {};\n    }\n\n    /**\n     * @type {Record<NodeID, Record<EdgeID, EdgeObj>>}\n     * @private\n     * v -> edgeObj\n     */\n    this._in = {};\n\n    /**\n     * @type {Record<NodeID, Record<NodeID, number>>}\n     * @private\n     * u -> v -> Number\n     */\n    this._preds = {};\n\n    /**\n     * @type {Record<NodeID, Record<EdgeID, EdgeObj>>}\n     * @private\n     * v -> edgeObj\n     */\n    this._out = {};\n\n    /**\n     * @type {Record<NodeID, Record<NodeID, number>>}\n     * @private\n     * v -> w -> Number\n     */\n    this._sucs = {};\n\n    /**\n     * @type {Record<EdgeID, EdgeObj>}\n     * @private\n     * e -> edgeObj\n     */\n    this._edgeObjs = {};\n\n    /**\n     * @type {Record<EdgeID, EdgeLabel>}\n     * @private\n     * e -> label\n     */\n    this._edgeLabels = {};\n  }\n\n  /* === Graph functions ========= */\n\n  /**\n   *\n   * @returns {boolean} `true` if the graph is [directed](https://en.wikipedia.org/wiki/Directed_graph).\n   * A directed graph treats the order of nodes in an edge as significant whereas an\n   * [undirected](https://en.wikipedia.org/wiki/Graph_(mathematics)#Undirected_graph)\n   * graph does not.\n   * This example demonstrates the difference:\n   *\n   * @example\n   *\n   * ```js\n   * var directed = new Graph({ directed: true });\n   * directed.setEdge(\"a\", \"b\", \"my-label\");\n   * directed.edge(\"a\", \"b\"); // returns \"my-label\"\n   * directed.edge(\"b\", \"a\"); // returns undefined\n   *\n   * var undirected = new Graph({ directed: false });\n   * undirected.setEdge(\"a\", \"b\", \"my-label\");\n   * undirected.edge(\"a\", \"b\"); // returns \"my-label\"\n   * undirected.edge(\"b\", \"a\"); // returns \"my-label\"\n   * ```\n   */\n  isDirected() {\n    return this._isDirected;\n  }\n  /**\n   * @returns {boolean} `true` if the graph is a multigraph.\n   */\n  isMultigraph() {\n    return this._isMultigraph;\n  }\n  /**\n   * @returns {boolean} `true` if the graph is compound.\n   */\n  isCompound() {\n    return this._isCompound;\n  }\n\n  /**\n   * Sets the label for the graph to `label`.\n   *\n   * @param {GraphLabel} label - Label for the graph.\n   * @returns {this}\n   */\n  setGraph(label) {\n    this._label = label;\n    return this;\n  }\n\n  /**\n   * @returns {GraphLabel | undefined} the currently assigned label for the graph.\n   * If no label has been assigned, returns `undefined`.\n   *\n   * @example\n   *\n   * ```js\n   * var g = new Graph();\n   * g.graph(); // returns undefined\n   * g.setGraph(\"graph-label\");\n   *  g.graph(); // returns \"graph-label\"\n   * ```\n   */\n  graph() {\n    return this._label;\n  }\n  /* === Node functions ========== */\n\n  /**\n   * Sets a new default value that is assigned to nodes that are created without\n   * a label.\n   *\n   * @param {typeof this._defaultNodeLabelFn | NodeLabel} newDefault - If a function,\n   * it is called with the id of the node being created.\n   * Otherwise, it is assigned as the label directly.\n   * @returns {this}\n   */\n  setDefaultNodeLabel(newDefault) {\n    if (!_.isFunction(newDefault)) {\n      newDefault = _.constant(newDefault);\n    }\n    this._defaultNodeLabelFn = newDefault;\n    return this;\n  }\n\n  /**\n   * @returns {number} the number of nodes in the graph.\n   */\n  nodeCount() {\n    return this._nodeCount;\n  }\n\n  /**\n   * @returns {NodeID[]} the ids of the nodes in the graph.\n   *\n   * @remarks\n   * Use {@link node()} to get the label for each node.\n   * Takes `O(|V|)` time.\n   */\n  nodes() {\n    return _.keys(this._nodes);\n  }\n  /**\n   * @returns {NodeID[]} those nodes in the graph that have no in-edges.\n   * @remarks Takes `O(|V|)` time.\n   */\n  sources() {\n    var self = this;\n    return _.filter(this.nodes(), function (v) {\n      return _.isEmpty(self._in[v]);\n    });\n  }\n  /**\n   * @returns {NodeID[]} those nodes in the graph that have no out-edges.\n   * @remarks Takes `O(|V|)` time.\n   */\n  sinks() {\n    var self = this;\n    return _.filter(this.nodes(), function (v) {\n      return _.isEmpty(self._out[v]);\n    });\n  }\n\n  /**\n   * Invokes setNode method for each node in `vs` list.\n   *\n   * @param {Collection<NodeID | number>} vs - List of node IDs to create/set.\n   * @param {NodeLabel} [value] - If set, update all nodes with this value.\n   * @returns {this}\n   * @remarks Complexity: O(|names|).\n   */\n  setNodes(vs, value) {\n    var args = arguments;\n    var self = this;\n    _.each(vs, function (v) {\n      if (args.length > 1) {\n        self.setNode(v, value);\n      } else {\n        self.setNode(v);\n      }\n    });\n    return this;\n  }\n\n  /**\n   * Creates or updates the value for the node `v` in the graph.\n   *\n   * @param {NodeID | number} v - ID of the node to create/set.\n   * @param {NodeLabel} [value] - If supplied, it is set as the value for the node.\n   * If not supplied and the node was created by this call then\n   * {@link setDefaultNodeLabel} will be used to set the node's value.\n   * @returns {this} the graph, allowing this to be chained with other functions.\n   * @remarks Takes `O(1)` time.\n   */\n  setNode(v, value) {\n    if (Object.prototype.hasOwnProperty.call(this._nodes, v)) {\n      if (arguments.length > 1) {\n        this._nodes[v] = value;\n      }\n      return this;\n    }\n\n    this._nodes[v] = arguments.length > 1 ? value : this._defaultNodeLabelFn(v);\n    if (this._isCompound) {\n      this._parent[v] = GRAPH_NODE;\n      this._children[v] = {};\n      this._children[GRAPH_NODE][v] = true;\n    }\n    this._in[v] = {};\n    this._preds[v] = {};\n    this._out[v] = {};\n    this._sucs[v] = {};\n    ++this._nodeCount;\n    return this;\n  }\n\n  /**\n   * Gets the label of node with specified name.\n   *\n   * @param {NodeID | number} v - Node ID.\n   * @returns {NodeLabel | undefined} the label assigned to the node with the id `v`\n   * if it is in the graph.\n   * Otherwise returns `undefined`.\n   * @remarks Takes `O(1)` time.\n   */\n  node(v) {\n    return this._nodes[v];\n  }\n\n  /**\n   * Detects whether graph has a node with specified name or not.\n   *\n   * @param {NodeID | number} v - Node ID.\n   * @returns {boolean} Returns `true` the graph has a node with the id.\n   * @remarks Takes `O(1)` time.\n   */\n  hasNode(v) {\n    return Object.prototype.hasOwnProperty.call(this._nodes, v);\n  }\n\n  /**\n   * Remove the node with the id `v` in the graph or do nothing if the node is\n   * not in the graph.\n   *\n   * If the node was removed this function also removes any incident edges.\n   *\n   * @param {NodeID | number} v - Node ID to remove.\n   * @returns {this} the graph, allowing this to be chained with other functions.\n   * @remarks Takes `O(|E|)` time.\n   */\n  removeNode(v) {\n    if (Object.prototype.hasOwnProperty.call(this._nodes, v)) {\n      var removeEdge = (e) => this.removeEdge(this._edgeObjs[e]);\n      delete this._nodes[v];\n      if (this._isCompound) {\n        this._removeFromParentsChildList(v);\n        delete this._parent[v];\n        _.each(this.children(v), (child) => {\n          this.setParent(child);\n        });\n        delete this._children[v];\n      }\n      _.each(_.keys(this._in[v]), removeEdge);\n      delete this._in[v];\n      delete this._preds[v];\n      _.each(_.keys(this._out[v]), removeEdge);\n      delete this._out[v];\n      delete this._sucs[v];\n      --this._nodeCount;\n    }\n    return this;\n  }\n\n  /**\n   * Sets the parent for `v` to `parent` if it is defined or removes the parent\n   * for `v` if `parent` is undefined.\n   *\n   * @param {NodeID | number} v - Node ID to set the parent for.\n   * @param {NodeID | number} [parent] - Parent node ID. If not defined, removes the parent.\n   * @returns {this} the graph, allowing this to be chained with other functions.\n   * @throws if the graph is not compound.\n   * @throws if setting the parent would create a cycle.\n   * @remarks Takes `O(1)` time.\n   */\n  setParent(v, parent) {\n    if (!this._isCompound) {\n      throw new Error('Cannot set parent in a non-compound graph');\n    }\n\n    if (_.isUndefined(parent)) {\n      parent = GRAPH_NODE;\n    } else {\n      // Coerce parent to string\n      parent += '';\n      for (var ancestor = parent; !_.isUndefined(ancestor); ancestor = this.parent(ancestor)) {\n        if (ancestor === v) {\n          throw new Error('Setting ' + parent + ' as parent of ' + v + ' would create a cycle');\n        }\n      }\n\n      this.setNode(parent);\n    }\n\n    this.setNode(v);\n    this._removeFromParentsChildList(v);\n    // @ts-expect-error -- We coerced parent to a string above\n    this._parent[v] = parent;\n    this._children[parent][v] = true;\n    return this;\n  }\n\n  /**\n   * @private\n   * @param {NodeID | number} v - Node ID.\n   */\n  _removeFromParentsChildList(v) {\n    delete this._children[this._parent[v]][v];\n  }\n\n  /**\n   * Get parent node for node `v`.\n   *\n   * @param {NodeID | number} v - Node ID.\n   * @returns {NodeID | undefined} the node that is a parent of node `v`\n   * or `undefined` if node `v` does not have a parent or is not a member of\n   * the graph.\n   * Always returns `undefined` for graphs that are not compound.\n   * @remarks Takes `O(1)` time.\n   */\n  parent(v) {\n    if (this._isCompound) {\n      var parent = this._parent[v];\n      if (parent !== GRAPH_NODE) {\n        return parent;\n      }\n    }\n  }\n\n  /**\n   * Gets list of direct children of node v.\n   *\n   * @param {NodeID | number} [v] - Node ID. If not specified, gets nodes\n   * with no parent (top-level nodes).\n   * @returns {NodeID[] | undefined} all nodes that are children of node `v` or\n   * `undefined` if node `v` is not in the graph.\n   * Always returns `[]` for graphs that are not compound.\n   * @remarks Takes `O(|V|)` time.\n   */\n  children(v) {\n    if (_.isUndefined(v)) {\n      v = GRAPH_NODE;\n    }\n\n    if (this._isCompound) {\n      var children = this._children[v];\n      if (children) {\n        return _.keys(children);\n      }\n    } else if (v === GRAPH_NODE) {\n      return this.nodes();\n    } else if (this.hasNode(v)) {\n      return [];\n    }\n  }\n\n  /**\n   * @param {NodeID | number} v - Node ID.\n   * @returns {NodeID[] | undefined} all nodes that are predecessors of the\n   * specified node or `undefined` if node `v` is not in the graph.\n   * @remarks\n   * Behavior is undefined for undirected graphs - use {@link neighbors} instead.\n   * Takes `O(|V|)` time.\n   */\n  predecessors(v) {\n    var predsV = this._preds[v];\n    if (predsV) {\n      return _.keys(predsV);\n    }\n  }\n\n  /**\n   * @param {NodeID | number} v - Node ID.\n   * @returns {NodeID[] | undefined} all nodes that are successors of the\n   * specified node or `undefined` if node `v` is not in the graph.\n   * @remarks\n   * Behavior is undefined for undirected graphs - use {@link neighbors} instead.\n   * Takes `O(|V|)` time.\n   */\n  successors(v) {\n    var sucsV = this._sucs[v];\n    if (sucsV) {\n      return _.keys(sucsV);\n    }\n  }\n\n  /**\n   * @param {NodeID | number} v - Node ID.\n   * @returns {NodeID[] | undefined} all nodes that are predecessors or\n   * successors of the specified node\n   * or `undefined` if node `v` is not in the graph.\n   * @remarks Takes `O(|V|)` time.\n   */\n  neighbors(v) {\n    var preds = this.predecessors(v);\n    if (preds) {\n      return _.union(preds, this.successors(v));\n    }\n  }\n\n  /**\n   * @param {NodeID | number} v - Node ID.\n   * @returns {boolean} True if the node is a leaf (has no successors), false otherwise.\n   */\n  isLeaf(v) {\n    var neighbors;\n    if (this.isDirected()) {\n      neighbors = this.successors(v);\n    } else {\n      neighbors = this.neighbors(v);\n    }\n    return neighbors.length === 0;\n  }\n\n  /**\n   * Creates new graph with nodes filtered via `filter`.\n   * Edges incident to rejected node\n   * are also removed.\n   * \n   * In case of compound graph, if parent is rejected by `filter`,\n   * than all its children are rejected too.\n\n   * @param {(v: NodeID) => boolean} filter - Function that returns `true` for nodes to keep.\n   * @returns {Graph<GraphLabel, NodeLabel, EdgeLabel>} A new graph containing only the nodes for which `filter` returns `true`.\n   * @remarks Average-case complexity: O(|E|+|V|).\n   */\n  filterNodes(filter) {\n    /**\n     * @type {Graph<GraphLabel, NodeLabel, EdgeLabel>}\n     */\n    // @ts-expect-error\n    var copy = new this.constructor({\n      directed: this._isDirected,\n      multigraph: this._isMultigraph,\n      compound: this._isCompound,\n    });\n\n    copy.setGraph(this.graph());\n\n    var self = this;\n    _.each(this._nodes, function (value, v) {\n      if (filter(v)) {\n        copy.setNode(v, value);\n      }\n    });\n\n    _.each(this._edgeObjs, function (e) {\n      if (copy.hasNode(e.v) && copy.hasNode(e.w)) {\n        copy.setEdge(e, self.edge(e));\n      }\n    });\n\n    var parents = {};\n    function findParent(v) {\n      var parent = self.parent(v);\n      if (parent === undefined || copy.hasNode(parent)) {\n        parents[v] = parent;\n        return parent;\n      } else if (parent in parents) {\n        return parents[parent];\n      } else {\n        return findParent(parent);\n      }\n    }\n\n    if (this._isCompound) {\n      _.each(copy.nodes(), function (v) {\n        copy.setParent(v, findParent(v));\n      });\n    }\n\n    return copy;\n  }\n\n  /* === Edge functions ========== */\n\n  /**\n   * Sets a new default value that is assigned to edges that are created without\n   * a label.\n   *\n   * @param {typeof this._defaultEdgeLabelFn | EdgeLabel} newDefault - If a function,\n   * it is called with the parameters `(v, w, name)`.\n   * Otherwise, it is assigned as the label directly.\n   * @returns {this}\n   */\n  setDefaultEdgeLabel(newDefault) {\n    if (!_.isFunction(newDefault)) {\n      newDefault = _.constant(newDefault);\n    }\n    this._defaultEdgeLabelFn = newDefault;\n    return this;\n  }\n\n  /**\n   * @returns {number} the number of edges in the graph.\n   * @remarks Complexity: O(1).\n   */\n  edgeCount() {\n    return this._edgeCount;\n  }\n\n  /**\n   * Gets edges of the graph.\n   *\n   * @returns {EdgeObj[]} the {@link EdgeObj} for each edge in the graph.\n   *\n   * @remarks\n   * In case of compound graph subgraphs are not considered.\n   * Use {@link edge()} to get the label for each edge.\n   * Takes `O(|E|)` time.\n   */\n  edges() {\n    return _.values(this._edgeObjs);\n  }\n\n  /**\n   * Establish an edges path over the nodes in nodes list.\n   *\n   * If some edge is already exists, it will update its label, otherwise it will\n   * create an edge between pair of nodes with label provided or default label\n   * if no label provided.\n   *\n   * @param {Collection<NodeID>} vs - 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Only useful with multigraphs.\n   * @returns {EdgeLabel | undefined} the label for the edge (`v`, `w`) if the\n   * graph has an edge between `v` and `w` with the optional `name`.\n   * Returned `undefined` if there is no such edge in the graph.\n   * @remarks\n   * `v` and `w` can be interchanged for undirected graphs.\n   * Takes `O(1)` time.\n   */\n  edge(v, w, name) {\n    var e =\n      arguments.length === 1\n        ? edgeObjToId(this._isDirected, arguments[0])\n        : edgeArgsToId(this._isDirected, v, w, name);\n    return this._edgeLabels[e];\n  }\n\n  /**\n   * Detects whether the graph contains specified edge or not.\n   *\n   * @overload\n   * @param {EdgeObj} v - Edge object.\n   * @returns {boolean} `true` if the graph has an edge between `v` and `w`\n   * with the optional `name`.\n   * @remarks\n   * `v` and `w` can be interchanged for undirected graphs.\n   * No subgraphs are considered.\n   * Takes `O(1)` time.\n   */\n  /**\n   * Detects whether the graph contains specified edge or not.\n   *\n   * @overload\n   * @param {NodeID | number} v - Source node ID.\n   * @param {NodeID | number} w - Target node ID.\n   * @param {string | number} [name] - Edge name. Only useful with multigraphs.\n   * @returns {boolean} `true` if the graph has an edge between `v` and `w`\n   * with the optional `name`.\n   * @remarks\n   * `v` and `w` can be interchanged for undirected graphs.\n   * No subgraphs are considered.\n   * Takes `O(1)` time.\n   */\n  hasEdge(v, w, name) {\n    var e =\n      arguments.length === 1\n        ? edgeObjToId(this._isDirected, arguments[0])\n        : edgeArgsToId(this._isDirected, v, w, name);\n    return Object.prototype.hasOwnProperty.call(this._edgeLabels, e);\n  }\n\n  /**\n   * Removes the edge (`v`, `w`) if the graph has an edge between `v` and `w`\n   * with the optional `name`. If not this function does nothing.\n   *\n   * @overload\n   * @param {EdgeObj} v - Edge object.\n   * @returns {this}\n   * @remarks\n   * `v` and `w` can be interchanged for undirected graphs.\n   * No subgraphs are considered.\n   * Takes `O(1)` time.\n   */\n  /**\n   * Removes the edge (`v`, `w`) if the graph has an edge between `v` and `w`\n   * with the optional `name`. If not this function does nothing.\n   *\n   * @overload\n   * @param {NodeID | number} v - Source node ID.\n   * @param {NodeID | number} w - Target node ID.\n   * @param {string | number} [name] - Edge name. Only useful with multigraphs.\n   * @returns {this}\n   * @remarks\n   * `v` and `w` can be interchanged for undirected graphs.\n   * Takes `O(1)` time.\n   */\n  removeEdge(v, w, name) {\n    var e =\n      arguments.length === 1\n        ? edgeObjToId(this._isDirected, arguments[0])\n        : edgeArgsToId(this._isDirected, v, w, name);\n    var edge = this._edgeObjs[e];\n    if (edge) {\n      v = edge.v;\n      w = edge.w;\n      delete this._edgeLabels[e];\n      delete this._edgeObjs[e];\n      decrementOrRemoveEntry(this._preds[w], v);\n      decrementOrRemoveEntry(this._sucs[v], w);\n      delete this._in[w][e];\n      delete this._out[v][e];\n      this._edgeCount--;\n    }\n    return this;\n  }\n\n  /**\n   * @param {NodeID | number} v - Target node ID.\n   * @param {NodeID | number} [u] - Optionally filters edges down to just those\n   * coming from node `u`.\n   * @returns {EdgeObj[] | undefined} all edges that point to the node `v`.\n   * Returns `undefined` if node `v` is not in the graph.\n   * @remarks\n   * Behavior is undefined for undirected graphs - use {@link nodeEdges} instead.\n   * Takes `O(|E|)` time.\n   */\n  inEdges(v, u) {\n    var inV = this._in[v];\n    if (inV) {\n      var edges = _.values(inV);\n      if (!u) {\n        return edges;\n      }\n      return _.filter(edges, function (edge) {\n        return edge.v === u;\n      });\n    }\n  }\n\n  /**\n   * @param {NodeID | number} v - Target node ID.\n   * @param {NodeID | number} [w] - Optionally filters edges down to just those\n   * that point to `w`.\n   * @returns {EdgeObj[] | undefined} all edges that point to the node `v`.\n   * Returns `undefined` if node `v` is not in the graph.\n   * @remarks\n   * Behavior is undefined for undirected graphs - use {@link nodeEdges} instead.\n   * Takes `O(|E|)` time.\n   */\n  outEdges(v, w) {\n    var outV = this._out[v];\n    if (outV) {\n      var edges = _.values(outV);\n      if (!w) {\n        return edges;\n      }\n      return _.filter(edges, function (edge) {\n        return edge.w === w;\n      });\n    }\n  }\n\n  /**\n   * @param {NodeID | number} v - Target Node ID.\n   * @param {NodeID | number} [w] - If set, filters those edges down to just\n   * those between nodes `v` and `w` regardless of direction\n   * @returns {EdgeObj[] | undefined} all edges to or from node `v` regardless\n   * of direction. 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