pattern-template-method

To prevent duplicate algorithm steps, define the invariant workflow in a single abstract base class so that individual variations stay centralized and maintainable across TypeScript subclasses.

The template method pattern captures a sequence of operations in an abstract base class, declaring mandatory steps as abstract methods and optional variations as hooks for subclasses to customize behavior without changing the flow.

Structure shared workflows by implementing a NestJS provider base class for shared pre/post processing sequences while letting each child provider handle its domain-specific operations through overridden methods.

Use the template method pattern when you have TypeScript or NestJS services that share invariant flows but vary specific steps, requiring abstract base classes with hook methods that subclasses override to customize behavior.

The best way to enforce consistent algorithm skeletons is to define the invariant workflow in a single superclass, using hook methods so subclasses can safely customize variations without altering the shared logic.