Method properties

packages/graph/src/Traversals.ts:2269–2292

(...propertyNames: TPropertyNames)

    ...propertyNames: TPropertyNames
  ): ValueTraversal<TSchema, Pick<GetTraversalPathProperties<TPath>, TPropertyNames[number]>>;
  public properties<
    const TPropertyNames extends readonly (keyof GetTraversalPathProperties<TPath>)[],
  >(...propertyNames: TPropertyNames) {
    return new ValueTraversal<
      TSchema,
      Pick<GetTraversalPathProperties<TPath>, TPropertyNames[number]>
    >(this.graph, [
      ...this.steps,
      new MapElementsStep<any>({
        mapper: (path) => {
          const value = path.value;
          const storedProps = value[$StoredElement].properties;
          if (propertyNames.length === 0) {
            return storedProps;
          }
          const properties = {} as any;
          for (const propertyName of propertyNames) {
            properties[propertyName] = storedProps[propertyName as keyof typeof storedProps];
          }
          return properties;
        },
      }),
    ]);
  }

  /**
   * Map each edge in the traversal to a new value.