Method traverse

packages/graph/src/Steps.ts:709–737

(
    source: GraphSource<any>,
    _input: Iterable<TraversalPath<any, any, any>>,
    _context?: QueryContext,
  )

  }

  public *traverse(
    source: GraphSource<any>,
    _input: Iterable<TraversalPath<any, any, any>>,
    _context?: QueryContext,
  ): IterableIterator<TraversalPath<any, any, any>> {
    const { vertexLabels, ids, stepLabels } = this.config;
    if (ids !== undefined && ids.length > 0) {
      for (const id of ids) {
        const vertex = source.getVertexById(id);
        if (vertex !== undefined) {
          this.traversed++;
          this.emitted++;
          yield new TraversalPath(undefined, vertex, stepLabels ?? []);
        }
      }
    } else if (vertexLabels !== undefined && vertexLabels.length > 0) {
      for (const vertex of source.getVertices(...vertexLabels)) {
        this.traversed++;
        this.emitted++;
        yield new TraversalPath(undefined, vertex, stepLabels ?? []);
      }
    } else {
      for (const vertex of source.getVertices()) {
        this.traversed++;
        this.emitted++;
        yield new TraversalPath(undefined, vertex, stepLabels ?? []);
      }
    }
  }

  public override clone(partial?: Partial<FetchVerticesStepConfig>) {
    const { config } = this;