jspm/jspm-cli
Jspm Cli
jspm-cli is a Deno-based command-line tool and import map package manager that resolves JavaScript dependencies to URLs for native ES module loading in the browser. It functions as an ESM dependency resolver and frontend build pipeline, mapping bare module specifiers to remote CDN URLs or local paths.
The tool acts as an environment-aware module manager, allowing developers to define conditional resolution rules to switch module implementations between development and production contexts. It manages the generation of browser-native import maps, which include cryptographic subresource integrity verification to ensure secure module loading.
Its broader capabilities cover project scaffolding, dependency installation management, and package export discovery. The toolkit includes a development server that performs on-the-fly type-stripping of TypeScript annotations, as well as utilities for package publishing to CDNs and production build optimization.
The tool is executed using the Deno runtime.
Features
- Deno CLI Tools - Provides a developer utility built on the Deno runtime for managing frontend assets and build workflows.
- Browser-Native Module Resolution - Maps bare module specifiers to remote URLs to enable native ES module loading directly in the browser.
- Environment-Aware Module Graphs - Defines conditional resolution rules to switch module implementations between development and production contexts.
- Conditional Import Map Generators - Handles multiple environment targets within a single import map and serializes them for specific deployment contexts.
- Environment-Conditional Resolution - Maps different versions of a module to the current execution environment to ensure compatibility across targets.
- Deno Runtime Support - Utilizes the Deno runtime to execute the CLI tool and manage package discovery and installation.
- Import Maps - Generates and manages import maps to enable native ES module loading in the browser without a heavy build step.
- Package Integrity Verifications - Generates and injects cryptographic subresource integrity hashes to ensure remote modules are not tampered with.
- Integrity Verifications - Generates integrity hashes for all modules in the dependency graph to protect against compromised remote resources.
- Subresource Integrity Verification - Implements cryptographic subresource integrity verification for remote JavaScript modules to protect against compromised resources.
- Environment-Aware Versioning - Switches between different module implementations and versions based on the target deployment context.
- ESM Dependency Resolution - Resolves bare module specifiers to remote CDN URLs to enable native ES module loading in the browser.
- ESM Dependency Resolvers - Maps bare module specifiers to remote CDN URLs with support for subresource integrity.
- Import Map Managers - Resolves JavaScript dependencies to URLs for native ES module loading in the browser via import maps.
- Build Optimization - Optimizes packages using a bundler to generate standalone bundles or production-ready HTML pages.
- Dependency Installers - Executes installation operations to resolve dependencies and update the current resolution state.
- Dependency Version Resolution - Resolves package versions by respecting constraints defined in local and remote configuration files.
- Frontend Build Pipelines - Provides an automated sequence of tasks for bundling, minifying, and optimizing web assets for production.
- Manifest-Driven Dependency Managers - Uses a local package manifest to track and seed the state of resolved dependency versions for reproducibility.
- Module Provider Configurations - Defines how modules are located using global, scoped, or custom provider hooks to handle various package sources.
- Web Project Scaffolding - Initializes project structures and configures environment-aware dependency rules for new web application development.
- Import Map Injection - Inserts mapping definitions into HTML files and adds preloading and integrity attributes for optimized loading.
- Environment Configurations - Adapts module implementations and configurations based on whether the target is a development or production environment.
- Frontend Asset Pipelines - Provides a pipeline for optimizing and packaging client-side assets into deployment-ready HTML files for production.
- Type Annotation Stripping - Removes TypeScript annotations on the fly to ensure source code is compatible with browser runtimes.
- CDN Provider Switching - Allows changing the source of JavaScript packages between different ESM-native CDNs or local directories.
- CDN Provider Abstractions - Abstracts the fetching of JavaScript packages from multiple ESM-native CDNs or local directories.
- Development Servers - Launches a local server that handles dependency installation, hot reloading, and on-the-fly type stripping.
- Import Map Injections - Provides automated injection of import maps and preloading attributes directly into HTML files for optimized module loading.
- Package Managers - Fluid package management for the browser.
