main.js

import { basename } from "https://deno.land/std@0.130.0/path/mod.ts";
import { join } from "https://deno.land/std@0.130.0/path/mod.ts";

if(!Deno.args.length){
    console.log("$ denobundle dir");
    Deno.exit(1);
}

var fi = await Deno.stat(Deno.args[0]);
var m = {};
if(fi.isFile){
    console.log("$ denobundle dir");
    Deno.exit(1);
}
var readdir = async (k, v) => {
    for await (const d of Deno.readDir(v)) {
        if(d.isFile){
            m[k+"/"+d.name] = join(v, d.name);
            continue;
        }
        await readdir(k+"/"+d.name, join(v, d.name));
    }
}
await readdir(Deno.args[0], Deno.args[0]);

var f = await Deno.create(Deno.args.length > 1 ? Deno.args[1] : "bundle.js");
await f.write(new TextEncoder().encode(`var m = {};\n`));
var l = Object.keys(m);
for(var i=0;i<l.length;i++){
    var k = l[i].replace(Deno.args[0], basename(Deno.args[0]))
    console.log(k);
    await f.write(new TextEncoder().encode(`m["${k}"] = new Uint8Array([`));
    var b = await Deno.readFile(m[l[i]]);
    for (var j = 0; j < b.length; j++) {
        await f.write(new TextEncoder().encode(`${b[j]},`));
    }
    await f.write(new TextEncoder().encode(`]);\n`));
}
await f.write(new TextEncoder().encode(`export default function(k){if(m[k]) return m[k]; throw 'NotFound';}\n`));
f.close();