flattenPromise #

Overview #

flattenPromise is a utility that makes it easier to work with Promise<Dependency> passed into your services.

For example, it simplifies the implementation of the TodosRepo from the IndexedDB example.

function createTodosRepo(idbPromise: Promise<IDBPDatabase>) {
  const idb = flattenPromise(idbPromise); 

  return {
    async create(todo: Todo): Promise<void> {
      await (await idbPromise).add('todos', todo); 
      await idb.add('todos', todo); 
    },
    // ...
  };
}

It works by using a Proxy to await the promise internally before calling any methods.