Implements a generic bail-style async iterator pattern: it iterates over an array, calling an async callback for each item, and stops (bails) as soon as any callback passes a result. This is a fundamental control flow utility used internally across multiple plugins and can be extracted and reused in any project that needs efficient async iteration with early termination.

A standalone filesystem wrapper with two pluggable caching backends: OperationMergerBackend (coalesces concurrent identical calls into a single I/O) and CacheBackend (time-based expiry with level decay). It provides stat, readdir, readFile, readJson, readlink operations with configurable TTL. The implementation is self-contained and reusable for any Node.js project needing to reduce filesystem load, with clear API and optional purge functionality.

Precompiles alias configuration entries into a structure optimized for fast matching: it groups aliases by the first character (char code) of the alias name, sorts them by specificity, and supports both plain and wildcard patterns. This non-obvious optimization avoids iterating all aliases for every resolution attempt and can be extracted as a general pattern for efficient string pattern matching against a large set of prefixes or wildcards.

Provides pure functions (`processExportsField`, `processImportsField`, `conditionalMapping`, `findMatch`) that parse and evaluate Node.js package.json `exports` and `imports` fields according to the Node.js specification. These functions handle wildcard patterns, conditional mapping (environment conditions), and branch on subpath patterns. They are isolated from the resolver plugin system and can be reused in any tool that needs to resolve package entry points (e.g., bundlers, import maps).