Node torrent import

A proof-of-concept showing how to download Node modules over BitTorrent.

This is not currently recommended for production use (see below).

Quick start

1. Install torrent-import:

   npm install torrent-import

2. Create a file that imports from a local torrent file.

   import { greet } from "./greet.js.torrent";
   console.log(greet());

   You can also use a magnet: URI instead of a torrent path.

   All files must use ES Modules. CommonJS is not supported (yet?).

3. Run Node with the --import torrent-import flag added.

   node --import torrent-import my-app.js
   # => Hello world!

See this repo's example/ folder for a runnable demo.

How it works

Node supports "Customization Hooks", which let you customize how modules are imported. torrent-import takes advantage of this feature.

Effectively, here's what this module does:

1. Adds an import hook that activates when importing a .torrent file or a magnet: URI.
2. When activated, uses WebTorrent to download the torrent.
3. Grabs the first .js file in the torrent and returns it, as if you'd imported it from the local file system.

It's a little more complicated (there's some caching, some debug logging, and some cleanup), but that's the idea.

As of this writing, Customization Hooks are unstable in Node, but it's at the "release candidate" stage.

Why do this?

• The primary reason: fun!
• Demonstrate that it's possible to import code in a decentralized way, without relying on centralized registries like npm (run by Microsoft).
• Kick the tires on a new Node feature to see how it works.

Why is this bad?

I do not recommend this for production use for several reasons:

• Customization Hooks, the main feature this module uses, are currently unstable in Node.
• Most torrents use SHA-1 for data integrity, but it's possible to break SHA-1. That means someone could run different code than you expect! (This threat is mitigated if you use BitTorrent v2.)
• Not isomorphic. In other words, it cannot run in the browser or other JavaScript runtimes.
• Many tools do not support this: TypeScript, "go to definition" in your editor, many more.
• Depends on seeder availability. If nobody's seeding the torrent, you can't run your code.
• The word "torrent" makes some people bristle, as it is often associated with illegal activity. BitTorrent is just a protocol like HTTP—there's nothing inherently illegal about it—but you don't see corporate firewalls blocking HTTP.
• This is a proof of concept and is rough. Error handling doesn't work well, for example.

There are probably other problems with this idea.