Open Source Packages
Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.
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postcss
A CSS transformation engine that parses styles into an AST, letting JS plugins lint, prefix, and rewrite CSS — the foundation beneath Autoprefixer, Tailwind, and 200+ other tools.
typescript-eslint
The official meta-package bundling the TypeScript ESLint parser, plugin, and rule presets behind a single typed config() helper.
Playwright
Cross-browser end-to-end web testing and browser automation with a single API for Chromium, Firefox, and WebKit.
React Testing Library
Simple and complete React DOM testing utilities that encourage good testing practices.
jest-dom
Custom Jest matchers for asserting on the state of the DOM in your tests.
jest
Delightful JavaScript testing with zero-config setup, snapshots, mocking, and coverage
lint-staged
Run linters and formatters only against the files staged in git, so a slow full-project lint never blocks a commit.
user-event
Simulates the full sequence of real browser events so Testing Library tests behave the way an actual user does.
Marked
A fast, low-level Markdown compiler that parses CommonMark and GFM into HTML in Node.js, browsers, or the CLI.
Pydantic
Data validation and settings management using Python type hints, backed by a Rust core.
testify
The essential Go toolkit for assertions, mocks, and structured test suites.
js-yaml
A fast, complete YAML 1.2 and 1.1 parser and serializer for JavaScript.
pytest
The Python testing framework that makes writing small tests easy and scales to complex functional test suites.
yaml
A definitive TypeScript parser and stringifier for YAML, supporting 1.1 and 1.2 with comment and CST access.
Commander.js
The complete, battle-tested framework for building Node.js command-line interfaces.
DOM Testing Library
Simple, framework-agnostic DOM query utilities that test your UI the way real users interact with it.
Storybook
The industry-standard workshop for building, documenting, and testing UI components in isolation, across every major frontend framework.
@codemirror/view
The DOM view layer for the CodeMirror 6 code editor, handling rendering, input, and editor chrome.
CodeMirror State
Immutable document, selection, and transaction data structures for the CodeMirror code editor
@monaco-editor/react
Drop the Monaco code editor into any React app without touching webpack, rollup, or bundler config files.
Oxlint
Rust-based JavaScript/TypeScript linter that runs 50-100x faster than ESLint, with zero configuration required.
tempfile
A secure, cross-platform Rust library for temporary files and directories that clean up automatically on drop.
@codemirror/language
Language support infrastructure for the CodeMirror 6 editor: parsing, indentation, code folding, bracket matching, and syntax highlighting.
url
A WHATWG-standard-compliant URL parser and manipulation library for Rust.
