Method isDescendantOf

packages/react-devtools-shared/src/devtools/store.js:743–763

(parentId: number, descendantId: number)

  }

  isDescendantOf(parentId: number, descendantId: number): boolean {
    if (descendantId === 0) {
      return false;
    }

    const descendant = this.getElementByID(descendantId);
    if (descendant === null) {
      return false;
    }

    if (descendant.parentID === parentId) {
      return true;
    }

    const parent = this.getElementByID(parentId);
    if (!parent || parent.depth >= descendant.depth) {
      return false;
    }

    return this.isDescendantOf(parentId, descendant.parentID);
  }

  /**
   * Returns index of the lowest descendant element, if available.