The core module defines three fundamental classes for declarative, fluent programming:
Each: A lazy, composable iterable abstraction for synchronous sequences.AsyncEach: A lazy, composable iterable abstraction for asynchronous sequences, mirroring theEachclass in the Promise domain.What: A fluent interface for composing and transforming functions declaratively.AsyncWhat: A fluent interface for composing and transforming async functions, mirroring theWhatclass in the Promise domain..