import type {
  ClassProvider,
  FactoryProvider,
  Provider,
  ValueProvider,
} from '@nestjs/common';
import { isUndefined } from '@nestjs/common/internal';

export function isClassProvider<T = any>(
  provider: Provider,
): provider is ClassProvider<T> {
  return Boolean((provider as ClassProvider<T>)?.useClass);
}

export function isValueProvider<T = any>(
  provider: Provider,
): provider is ValueProvider<T> {
  const providerValue = (provider as ValueProvider)?.useValue;
  return !isUndefined(providerValue);
}

export function isFactoryProvider<T = any>(
  provider: Provider,
): provider is FactoryProvider<T> {
  return Boolean((provider as FactoryProvider).useFactory);
}