plumpmath / bebo

Run Clojure scripts on deno

bebo

Deno is a modern runtime for JavaScript and TypeScript. Go to the deno website to learn more.

This is a tool to run Clojure scripts on deno using SCI.

Install from CDN

To preserve fine-grained control per script invocation, you can use the run.ts script to invoke a ClojureScript (.cljs) file:

deno run --allow-net \
     https://cdn.jsdelivr.net/npm/[email protected]/run.ts \
     https://raw.githubusercontent.com/PlumpMath/bebo/main/examples/server/example.cljs

and install this invocation as a named tool:

deno install --name server-example --allow-net \
     https://cdn.jsdelivr.net/npm/[email protected]/run.ts \
     https://raw.githubusercontent.com/PlumpMath/bebo/main/examples/server/example.cljs

To install bebo as a script runner with full access:

$ deno install --allow-all --name bebo https://cdn.jsdelivr.net/npm/[email protected]/lib/bebo_main.js

Then run bebo on a local or remote .cljs file:

$ bebo run https://raw.githubusercontent.com/PlumpMath/bebo/main/examples/server/example.cljs
Listening on http://localhost:8080/

Compile

Deno supports a compile option which lets you create a standalone executable. This has the benefit of faster startup time. One disadvantage is that you have to specify all used dependencies up front. See it as an optimization when you're done developing your application.

To do this, create a runner.js:

import { runScript } from 'https://cdn.jsdelivr.net/npm/[email protected]/lib/bebo_core.js'

// Add all modules you are going to use within .cljs scripts. They will be bundled into the executable.
import "https://deno.land/[email protected]/http/server.ts"

// The .cljs script to be invoked:
await runScript(Deno.args[0]);

Then:

$ deno compile --allow-all -o runner runner.js

Then:

./runner examples/server/example.cljs

Build and run

$ npx shadow-cljs release bebo
$ deno run --allow-read --allow-net lib/bebo_main.js examples/server/example.cljs
Listening on http://localhost:8080/