Function resolveProvider

packages/core/src/render3/di_setup.ts:70–244

* Resolves a provider and publishes it to the DI system.

(
  provider: Provider,
  tInjectables: TData,
  lInjectablesBlueprint: NodeInjectorFactory[],
  isComponent: boolean,
  isViewProvider: boolean,
)

 * Resolves a provider and publishes it to the DI system.
 */
function resolveProvider(
  provider: Provider,
  tInjectables: TData,
  lInjectablesBlueprint: NodeInjectorFactory[],
  isComponent: boolean,
  isViewProvider: boolean,
): void {
  provider = resolveForwardRef(provider);
  if (Array.isArray(provider)) {
    // Recursively call `resolveProvider`
    // Recursion is OK in this case because this code will not be in hot-path once we implement
    // cloning of the initial state.
    for (let i = 0; i < provider.length; i++) {
      resolveProvider(
        provider[i],
        tInjectables,
        lInjectablesBlueprint,
        isComponent,
        isViewProvider,
      );
    }
  } else {
    const tView = getTView();
    const lView = getLView();
    const tNode = getCurrentTNode()!;
    let token: any = isTypeProvider(provider) ? provider : resolveForwardRef(provider.provide);

    const providerFactory = providerToFactory(provider);
    if (ngDevMode) {
      const injector = new NodeInjector(
        tNode as TElementNode | TContainerNode | TElementContainerNode,
        lView,
      );
      runInInjectorProfilerContext(injector, token, () => {
        emitProviderConfiguredEvent(provider as SingleProvider, isViewProvider);
      });
    }

    const beginIndex = tNode.providerIndexes & TNodeProviderIndexes.ProvidersStartIndexMask;
    const endIndex = tNode.directiveStart;
    const cptViewProvidersCount =
      tNode.providerIndexes >> TNodeProviderIndexes.CptViewProvidersCountShift;

    if (isTypeProvider(provider) || !provider.multi) {
      const factory = new NodeInjectorFactory(
        providerFactory,
        isViewProvider,
        ɵɵdirectiveInject,
        ngDevMode ? providerName(provider) : null,
      );
      const existingFactoryIndex = indexOf(
        token,
        tInjectables,
        isViewProvider ? beginIndex : beginIndex + cptViewProvidersCount,
        endIndex,
      );
      if (existingFactoryIndex === -1) {
        diPublicInInjector(