Provides lens-based utilities for manipulating LSP Position and Range objects. Demonstrates skillful use of the lens library for immutable data transformation in a type-safe way. The module is self-contained with no external dependencies beyond the lens library and could be extracted for use in any LSP implementation needing position manipulation utilities.

Defines isomorphisms between PureScript CST (Concrete Syntax Tree) types and LSP types. This cleanly separates domain model concerns from protocol concerns, making it easier to evolve either independently. The pattern demonstrated here is valuable for any tool that needs to adapt between internal representations and external protocol specifications.

Implements a pure functional ranking system for completion items using monoidal properties. The ranking system is composable and extensible, allowing different ranking strategies to be combined. This component demonstrates advanced functional programming techniques and could be reused in any completion system needing intelligent item ordering.

Provides version-aware retrieval of type information from the PureScript IDE server. It abstracts away differences between compiler versions, allowing the language server to work with multiple versions of the PureScript compiler. This demonstrates the important pattern of adapting to evolving APIs while maintaining backward compatibility.