deno run coffeescript ))

runner.js

//deno run -A runner.js t.coffee

import * as cs from 'https://coffeescript.org/v2/browser-compiler-modern/coffeescript.js'

let f = async ()=>{ 
	const decoder = new TextDecoder('utf-8');
	var content = await Deno.readFile( Deno.args[0] );
	const source = decoder.decode(content);
	let js = cs.compile( source );
	eval( js );
}
f();