Function discoverDiGraph

packages/core/src/debug/ai/di_graph.ts:68–83

* Traverses the Angular internal tree from the root to discover element and environment injectors.

(roots: HTMLElement[])

 * Traverses the Angular internal tree from the root to discover element and environment injectors.
 */
function discoverDiGraph(roots: HTMLElement[]): DiGraph {
  const rootLViews = roots.map((root) => {
    const lContext = getLContext(root);
    if (!lContext?.lView) {
      throw new Error(
        `Could not find an \`LView\` for root \`<${root.tagName.toLowerCase()}>\`, is it an Angular component?`,
      );
    }
    return lContext.lView;
  });

  return {
    elementInjectorRoots: rootLViews.map((rootLView) => walkElementInjectors(rootLView)),
    environmentInjectorRoot: collectEnvInjectors(rootLViews),
  };
}

/**
 * Traverses all directive-hosting nodes in the `rootLView` hierarchy and builds a tree of