systemjs/systemjs

Features

• Dynamic Module Loaders - Functions as a universal module loader that resolves and executes JavaScript modules across different environments.
• Module Resolvers - Resolves bare module specifiers to absolute URLs using configurable import maps.
• ES Module Support - Functions as a dynamic loader that resolves and executes ES modules across different browser and server environments.
• URL Resolvers - Maps bare module names to specific absolute or relative URLs using a mapping configuration.
• Resolution and Mapping Systems - Uses a configurable lookup table to resolve bare module specifiers into absolute URLs at runtime.
• Import Map Configurations - Provides mapping configurations that resolve module import paths to specific network locations based on the importer's context.
• Dynamic Dependency Managers - Acts as a runtime registry that fetches and manages the lifecycle of JavaScript modules and non-JS assets.
• Module Management - Fetches modules by name or URL and resolves them to their namespace values.
• Import Maps - Implements an import map polyfill that resolves module specifiers to specific URLs without requiring a build step.
• Hot Module Reloaders - Manages the internal module registry to facilitate runtime hot-reloading and memory cleanup.
• ES Module Integrations - Replicates modern ES module semantics in older browsers using a specialized polyfill format.
• Module Format Polyfills - Emulates ES module semantics by wrapping code in registration functions to provide module support in legacy environments.
• Polyfill Module Declarations - Provides a polyfill format for registering modules and declaring their dependencies and exports.
• Universal Module Loaders - Integrates diverse module formats, including AMD and global scripts, into a modern ES module workflow.
• Dynamic Imports - Implements a contextual import function to enable asynchronous module loading during runtime.
• Module-Based Registries - Maintains a centralized registry of loaded module namespaces to ensure single-instance execution and dependency sharing.
• Modular Dependency Management - Maps bare module specifiers to absolute URLs to simplify how libraries are referenced and resolved at runtime.
• View-to-URL Mapping - Maps bare module specifiers to specific URLs using configuration to simplify dependency references.
• Polyfills - Provides modern module loading and import map capabilities to older browsers that lack native support.
• Legacy Module Format Support - Provides runtime support for loading and executing modules defined via the Asynchronous Module Definition format.
• Asset Loading and Resolution - Integrates non-JavaScript assets like WebAssembly, CSS, and JSON as first-class modules.
• Runtime Loader Hooks - Provides custom hooks to modify how modules are resolved and fetched during the loading process.
• Import Map Loading - Retrieves module mapping configurations from external sources using programmable fetch hooks.
• Async-Await Flow Control - Executes modules asynchronously by supporting top-level await in the module entry function.
• Module Lifecycle Managers - Manages the lifecycle of loaded modules, including the ability to remove them from the registry for code reloading.
• JSON Module Imports - Treats JSON files as first-class modules for direct use as default exports within JavaScript.
• Scoped Resolutions - Allows applying different module mappings based on the importing file path to support multiple dependency versions.
• Legacy Format Integration - Integrates diverse legacy formats, including AMD and global scripts, into a modern ES module workflow.
• Legacy Module Adapters - Integrates legacy module patterns like AMD and global scripts into a modern ES module workflow.
• Non-JavaScript Asset Imports - Enables the integration of JSON, CSS, and WebAssembly binaries as standard modules.
• Parallel Dependency Loading - Prevents network waterfalls by defining the dependency tree upfront to fetch all lazy modules simultaneously.
• Concurrent Dependency Resolution - Implements concurrent fetching of the full dependency graph to prevent sequential network request waterfalls.
• Module Loaders - Overrides the default network request mechanism to transform module source code before it is executed.
• Import Assertions - Implements import assertions to let the loader determine the correct format for non-JavaScript assets.
• Hook-Based Extension Frameworks - Provides a programmable hook-based pipeline to intercept and customize module resolution, fetching, and instantiation.
• Module Pipeline Interceptors - Intercepts the resolution, fetching, instantiation, and execution of modules to support custom file formats.
• Constructable Stylesheets - Provides the ability to load CSS as modules using constructable stylesheets for integrated styling.
• Browser Scripting Tools - Uses asynchronous hooks to customize the creation and loading of scripts in the browser.
• Global Script Registrations - Imports traditional non-module scripts and exposes their global variables as default exports.
• WebAssembly Module Loaders - Loads WebAssembly binaries as modules that can maintain imports and exports.
• Build Tools - Dynamic module loader for modern browser environments.
• Module Loaders - Universal module loader for AMD, CJS, and ES6.
• Transpilers and Polyfills - A universal dynamic loader for various module formats and environments.

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