This repo showcases how to create a JavaScript runtime using the Deno Runtime. This is useful for embedding and customizing Deno's runtime in your Rust application or creating a custom JavaScript runtime based on Deno's runtime. Deno Runtime has a permission model and architecture that makes it a great sandbox and you can write custom extensions and tap into their permissions. This repo showcases:
- Writing a custom extension
- Handling permissions with custom prompter
- Importing from https sources like esm.sh and handling TypeScript files
The all_the_things.ts file is a good one showcasing all three features: importing from https sources, handling permissions, and using extensions. You can find the implementation of everything in the src/ directory on these three files:
main.rsis the Rust code that bootstraps the runtime, defines the extension and handles the permissions.bootstrap.jsis the entry point for the JavaScript side, here you sugar the extension code.module_loader.rsis the code that strips the TypeScript from the files so that they can be loaded as regular JavaScript files and imports from https sources and files.
I'll continue to add more features and examples as I need them for my projects. I hope this helps you too!
These are useful guides that helped me undersand Deno's internals andhow to use the crates better:
- Deno's "Roll your own JavaScript runtime" series:
- Deno 2 internals by Divy Srivastava: https://littledivy.com/deno-2.html
You need to have Rust and Cargo installed: https://www.rust-lang.org/learn/get-started. Then run it with:
cargo run