Provides a clean error class hierarchy (CoralError, TraceableError, MultiError, InvalidRequestError, etc.) and an abstract ErrorReporter with Sentry integration. This is a self-contained, reusable error handling pattern that can be extracted into any JavaScript/TypeScript project to standardize error types and reporting. It demonstrates non-obvious skill by separating error definitions from reporting mechanics, supporting multiple reporters, and including a global error reporter.

Implements a PromisifiedStorage abstraction over browser storage APIs (localStorage, sessionStorage, InMemoryStorage, IndexedDBStorage) with utilities like combinePromisifiedStorage and prefixStorage for scoping. This module is fully self-contained, has unit tests, and can be extracted into any web application to provide a consistent, testable storage interface. It demonstrates clean separation of concerns and handles asynchronous storage operations uniformly.

Defines a phase-based comment processing pipeline where each phase (spam, wordList, toxic, repeatPost, externalModeration, etc.) is a factory function that returns a processing function. Results from phases are merged using mergePhaseResult, allowing independent, composable processing steps. This pattern is reusable for any sequential data transformation pipeline (e.g., ETL, validation chains) and demonstrates a clean, extensible design that avoids tight coupling between stages.