Compile-time tests for types to make sure types don't regress into being overly permissive as changes go in over time.

Assertion toolkit for Puppeteer that extends Jest's expect API with high-level matchers for integration testing.

Jest preset that enables end-to-end testing with Puppeteer, providing browser automation and testing utilities.

BDD style assertions for node and the browser.

Externalizes the source map found inside a stream to an external .js.map file.

A browser polyfill for W3C EventSource (Server-Sent Events) with cross-browser compatibility for IE8+ and Android browser 2.1+

Streaming, source-agnostic EventSource/Server-Sent Events parser for building clients and polyfills

Node's event emitter for all engines.

High-performance EventEmitter with Node.js compatibility and contextual event emission

An implementation of WHATWG EventTarget interface with modern features like passive listeners, once-only listeners, and AbortSignal integration.

Toolkit for creating and working with Node.js streams, treating streams as arrays laid out in time

EventSource polyfill for Server-Sent Events with cross-browser compatibility and advanced features

Unit conversion functions for Ethereum including parsing, formatting, and commifying values.

Utilities for decoding and encoding Ethereum transaction for ethers.

String utility functions for Ethereum development, focusing on UTF-8 encoding/decoding, Bytes32 string formatting, and Unicode normalization.

Solidity coder for non-standard (tight) packing.

Recursive-Length Prefix (RLP) coder for Ethereum applications.

Logger utility functions for ethers with comprehensive error handling and validation capabilities.

Property utility functions for the ethers.js ecosystem, providing object property management and manipulation capabilities.

Network definitions and configuration management for Ethereum and compatible blockchain networks