build/lib/tsb/utils.ts/Graph/inertEdge
class Graph:        inertEdge(from: T, to: T): void {
            const fromNode = this.lookupOrInsertNode(from);
            const toNode = this.lookupOrInsertNode(to);

            fromNode.outgoing[this._hashFn(to)] = toNode;
            toNode.incoming[this._hashFn(from)] = fromNode;
        }