Function findDirectiveDefMatches

packages/core/src/render3/instructions/shared.ts:459–497

(
  tView: TView,
  tNode: TElementNode | TContainerNode | TElementContainerNode,
)

 * If a component is matched (at most one), it is returned in first position in the array.
 */
export function findDirectiveDefMatches(
  tView: TView,
  tNode: TElementNode | TContainerNode | TElementContainerNode,
): DirectiveDef<unknown>[] | null {
  ngDevMode && assertFirstCreatePass(tView);
  ngDevMode && assertTNodeType(tNode, TNodeType.AnyRNode | TNodeType.AnyContainer);

  const registry = tView.directiveRegistry;
  let matches: DirectiveDef<unknown>[] | null = null;
  if (registry) {
    for (let i = 0; i < registry.length; i++) {
      const def = registry[i] as ComponentDef<any> | DirectiveDef<any>;
      if (isNodeMatchingSelectorList(tNode, def.selectors!, /* isProjectionMode */ false)) {
        matches ??= [];

        if (isComponentDef(def)) {
          if (ngDevMode) {
            assertTNodeType(
              tNode,
              TNodeType.Element,
              `"${tNode.value}" tags cannot be used as component hosts. ` +
                `Please use a different tag to activate the ${stringify(def.type)} component.`,
            );

            if (matches.length && isComponentDef(matches[0])) {
              throwMultipleComponentError(tNode, matches.find(isComponentDef)!.type, def.type);
            }
          }

          matches.unshift(def);
        } else {
          matches.push(def);
        }
      }
    }
  }

  return matches;
}

export function elementAttributeInternal(
  tNode: TNode,