A React component that provides a grouped variable selection popover. It is self-contained, uses controlled state, and supports filtering, selection, and custom rendering. Can be extracted as a standalone UI atom for any project needing a searchable variable picker with hierarchical grouping.

An Axios-based HTTP client factory that deduplicates concurrent requests for the same endpoint. Uses a promise cache keyed by URL+method+body to avoid redundant network calls. Implements retry logic and error normalization. This pattern is directly reusable in any frontend application that needs to prevent duplicate API requests.

A collection of utility functions for sanitizing user inputs and logs: null-byte removal, IP address masking (GDPR-compliant), audit metadata redaction, and generic string sanitization. These are pure functions with no internal dependencies, making them safely extractable for any Node.js project requiring input sanitization and privacy protection.

A factory that creates storage provider instances (Local, S3, GCS, Azure) based on configuration. Each provider implements a common `IStorageProvider` interface with methods like `saveFile`, `getFile`, `deleteFile`. This abstraction is clean, extensible, and can be extracted as a reusable storage layer for any application needing pluggable file storage.

A MUI theme factory that generates a complete Material-UI theme from a set of tokens (colors, spacing, shadows, border radius) and produces CSS variables for canvas styling. It demonstrates a clean separation of design tokens from component styling and is directly reusable for any React application wanting a themable UI with CSS variable support.