porsager/postgres is a PostgreSQL client library for Node.js, Deno, and Cloudflare Workers. It provides a full-featured, performant interface to PostgreSQL using tagged template literals for safe, parameterized queries. The library implements the PostgreSQL wire protocol from scratch with zero runtime dependencies, supporting advanced features like connection pooling, prepared statements, cursors, COPY streams, logical replication, large objects, and custom type mapping. The architecture is a factory function that returns a `sql` tagged template function, which lazily connects to the database and pipelines queries over persistent connections. The codebase is well-structured across `src/` with separate modules for connection management, query execution, protocol message building, type serialization/parsing, and error handling. It also includes transpiled builds for CommonJS, Deno, and Cloudflare Workers, each with platform-specific polyfills. The library is actively maintained, has extensive test coverage, and is published under a public domain license.