Awesome GitHub RepositoriesES Module Support

Preact is a lightweight declarative user interface library designed for building high-performance web applications. It utilizes a component-based architecture where interfaces are defined as functional or class-based units, relying on a virtual DOM to perform efficient state reconciliation and updates. By prioritizing a minimal footprint, the library enables developers to create modular, predictable, and testable user interfaces while maintaining compatibility with standard browser APIs. The library distinguishes itself through a reactive state engine that leverages signals to track dependenc

Mocha is a JavaScript test runner and framework designed to execute automated test suites across multiple runtimes, including Node.js and web browser environments. It functions as a pluggable testing tool for organizing and validating unit, integration, and functional tests. The project distinguishes itself through a plugin-based extension interface that allows for custom functionality and reporting. It supports a multi-runtime approach, enabling the same test suite to run in different JavaScript environments, and includes a watch mode that monitors the filesystem to trigger automatic test re

Snowpack is an ESM-powered frontend build tool and development server that serves native ES modules directly to the browser. By eliminating the bundling process during development, it enables nearly instant server startup and unbundled frontend development. The project features a framework-aware hot module reload system that preserves component state during updates, with specific Fast Refresh integration for React, Preact, Svelte, and Vue. It also acts as a modern web transpiler, automatically converting TypeScript, JSX, and CSS Modules into browser-compatible code without requiring manual co

Jasmine is a JavaScript testing framework and test runner designed for behavior-driven development. It provides a comprehensive toolset for writing and executing descriptive test suites that verify code behavior in both web browsers and Node.js environments. The framework is distinguished by its integrated mocking library, which allows for dependency isolation through spies and stubs, as well as the ability to simulate time and timing functions to test asynchronous logic synchronously. It also includes a mechanism to enforce test uniqueness, preventing duplicate names for tests and suites. I

Shoelace is a web component UI library consisting of a suite of accessible, framework-agnostic user interface elements. It provides a collection of custom element components and reusable HTML tags that encapsulate style and behavior to work across any JavaScript framework or plain HTML pages. The system is designed as a themable UI component system, utilizing CSS variables to manage visual themes and dark mode support. This allows for the implementation of custom design systems and a consistent visual language across web environments. The library covers broader capabilities in accessible int

SystemJS is a dynamic dependency manager and universal module loader that resolves and executes JavaScript modules across different browser and server environments. It functions as an import map polyfill, mapping bare module specifiers to absolute URLs to manage dependencies without requiring a build step. The project provides a system for integrating diverse formats, including AMD and global scripts, into a modern ES module workflow. It enables browser module polyfilling for environments that lack native support for ES modules and import maps, and it allows for dynamic runtime hot-reloading

tsdx is a zero-config command line interface and build tool designed for developing, bundling, and distributing TypeScript libraries. It functions as a project scaffolder and development toolchain that initializes new libraries from templates with standardized folder structures and pre-configured dependencies. The project specializes in producing dual-format module distributions, simultaneously generating both CommonJS and ES modules to ensure compatibility across different JavaScript environments. It utilizes a Rollup-based bundling system to compile TypeScript source into optimized distribu

tsup is a build tool designed for the automated compilation and packaging of TypeScript and JavaScript source code into compatible module formats. It functions as a TypeScript library bundler that transforms source files into distributable assets with minimal manual configuration. The project provides a zero-config build pipeline that abstracts complex bundler settings into a simplified interface. It is an esbuild-based tool that produces simultaneous ESM and CommonJS output files from a single source tree to ensure broad environment compatibility. The tool covers high-performance transpilat

Picturefill is a responsive image polyfill that adds support for the picture element, srcset, and sizes attributes in browsers that lack native implementation. It emulates the picture element with source media queries and format fallbacks, providing responsive image selection based on viewport size and device pixel ratio. The polyfill reevaluates responsive image sources after dynamic DOM changes to keep displayed images correct, and delivers alternative image formats like WebP with automatic fallback to standard formats in unsupported browsers. It also conserves bandwidth by selecting smalle

cube-ui is a mobile-first Vue.js component library that provides a comprehensive set of pre-built UI elements for building touch-based mobile web applications. The library is built on Vue's single-file component architecture and supports on-demand ES module imports, allowing developers to selectively load only the components they need to optimize bundle size. It also offers plugin-based global registration for convenient setup and includes a CLI scaffolding tool to generate project skeletons with pre-configured build settings. The library distinguishes itself with a gesture-driven interaction

This is a video course that teaches JavaScript from scratch, covering fundamentals like variables, functions, scope, closures, and data types through 88+ lessons organized into 15 modules. The course uses a live-coding pedagogy where students code alongside pre-recorded video lessons, with each lesson providing starter and solution files for self-paced practice. The curriculum focuses on browser-native APIs, teaching DOM manipulation, event handling, and data fetching without external frameworks. Students build real-world projects like image galleries, drawing tools, and audio visualizers thr

Sucrase is a high-speed transpilation tool that compiles modern JavaScript, TypeScript, JSX, and Flow to standard JavaScript for modern runtimes. It operates as a fast alternative to Babel, using a single-pass scanner and tokenizer that strips type annotations and applies only requested syntax transforms without building an AST or performing type checking. The tool differentiates itself through a zero-type-checking pipeline that omits type checking entirely, relying on the assumption that input code is already valid for the target runtime. It uses scanner-based tokenization and single-pass co

AR.js is a JavaScript library for building augmented reality experiences that run directly in the web browser. It provides the core capability to render digital content overlaid on the real world using either the A-Frame HTML component system or the three.js JavaScript library, supporting both marker-based and location-based AR approaches. The library enables tracking of predefined 2D images, fiducial markers, and image targets through the device camera, allowing virtual objects such as 3D models, videos, or images to be positioned relative to recognized visual references. For location-based

Timber is a PHP library that integrates the Twig template engine into WordPress themes, providing an object-oriented framework for theme development. It wraps WordPress data — posts, terms, users, menus, and comments — in structured PHP classes, allowing developers to work with objects instead of raw arrays while keeping HTML markup separate from PHP logic through Twig templates. The library distinguishes itself by offering a complete set of tools for modern WordPress theme building. It includes a file-based template hierarchy with fallback chains, dynamic image manipulation with resizing, cr

eslint-plugin-unicorn is an ESLint plugin that provides a large set of opinionated lint rules for JavaScript and TypeScript projects. Its primary purpose is to enforce code quality, prevent common errors and anti-patterns, and promote a consistent coding style across a codebase. The plugin distinguishes itself by offering an opinionated preset configuration that imposes a specific coding style rather than leaving all choices to the user. Its rules are specifically designed to catch logical mistakes and code smells that go beyond standard ESLint rules. As an added capability, the plugin also e

create-react-library ist ein Kommandozeilen-Generator und eine Entwicklungsumgebung für die Erstellung wiederverwendbarer React-Komponentenbibliotheken. Es erstellt die notwendige Projektstruktur und die Build-Pipelines, die erforderlich sind, um JavaScript-Module zu entwickeln, zu bündeln und in einer Registry zu veröffentlichen. Das Tool bietet eine Entwicklungsschleife, die das Quellverzeichnis der Bibliothek mit einer begleitenden Beispielanwendung verknüpft, was Echtzeit-Updates und Live-Vorschauen ermöglicht. Es enthält zudem eine Deployment-Pipeline, die Beispielanwendungen in Produktions-Builds für das Hosting als öffentliche Dokumentation transformiert. Das Build-System verwaltet das Multi-Format-Modul-Bundling für CommonJS- und ES-Module, einschließlich der Generierung von Sourcemaps. Es handhabt zudem das Peer-Dependency-Management, um sicherzustellen, dass geteilte Abhängigkeiten externalisiert und nicht in das finale Paket gebündelt werden.

This is a collection of official extensions for the Rollup bundling process. These plugins serve as module transformers, resolution managers, and bundle optimizers designed to modify how JavaScript modules are processed, resolved, and optimized. The suite provides specialized capabilities for modern web transpilation, converting TypeScript, JSX, Flow, and GraphQL into compatible JavaScript. It distinguishes itself through extensive non-JavaScript asset integration, allowing the import of JSON, YAML, CSV, and image files as JavaScript modules or data URIs, and providing support for bundling We

This project is a multi-purpose toolkit consisting of an AI agent knowledge base, a developer tool UI kit, a markdown presentation framework, a technical diagram renderer, and a TypeScript library bundler. It provides the infrastructure to curate documented guidelines into structured collections for automated AI outputs while offering tools for creating technical content and distributing software libraries. The markdown presentation framework allows for the creation of interactive slide decks featuring synchronized code blocks, motion transitions, and the rendering of mathematical formulas an