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Import Maps and Built In Modules in JavaScript Runtimes
- Import maps provide instructions to JavaScript runtimes on how to load modules, offering a more direct and explicit approach compared to Node's resolution process.
- By defining mappings in an import map inside HTML, browsers can understand and rewrite bare specifiers to valid URLs before initiating fetch requests.
- Import maps allow mapping multiple names and support scoped overrides to manage module versions in different parts of the codebase.
- They do not mix well with dynamic import() unless all specifiers are covered by the map, and caching may require query params for file changes.
- Built-in modules in JavaScript runtimes like Node and Deno eliminate the need for bundlers and loaders, with Deno using stable URLs for imports and managing caching internally.
- Node's built-in modules like fs, path, and http are part of the core runtime, while Deno offers a minimal runtime with modules loaded from stable URLs.
- Deno's strict module loading behavior requires explicit imports for both local files and remote resources, improving predictability across projects.
- Deno caches modules based on their full URLs, ensuring that even small changes trigger separate cache entries and enabling easy updates by changing the URL.
- Importing modules in Deno directly points to the source, eliminating the need for dependency managers or node_modules folders and providing a self-contained project.
- Projects in Deno are explicit, direct, and organized without hidden dependency graphs, offering bundling and compilation features for packaging projects without additional dependencies.
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