A state machine that parses large Chrome performance trace files (JSON) in chunks to avoid V8 string length limits. It scans raw bytes for JSON boundaries, batches events, and handles edge cases like multibyte UTF-8, escaped strings, and nested delimiters. This is a non-obvious, reusable pattern for processing large JSON arrays in memory-constrained environments.

Formats console messages with source-mapped stack traces, groups consecutive identical messages (like DevTools console), and supports both text and JSON output. The grouping logic and stack trace resolution are non-trivial and could be extracted for any console-logging system.

Creates an accessibility tree snapshot from CDP data, assigns stable IDs to nodes, and injects extra nodes (e.g., for elements not in the accessibility tree) by finding the nearest ancestor. This is a self-contained pattern for building structured accessibility representations from raw browser data.

Sanitizes tool call parameters for telemetry (removing sensitive data like URLs, file paths, and large strings), bucketizes latency values, and builds context objects. This is a reusable pattern for any telemetry system that needs to log structured, privacy-safe usage data.

A simple but consistently used pagination utility that slices arrays and returns a page with metadata (total, page index, page size). Used across network requests, console messages, heap snapshot data, and CSS rules. Demonstrates a clean, reusable pattern for paginating any list data.