Exploring Denoland #1 - My first stomps with DENO

Alberto Beiz — Fri, 15 May 2020 16:35:32 +0000

Sooo Deno 1.0 just launched. I have 0 knowledge about it but I’m curious to see what it has to offer.

As the seasoned software developer that I am, let’s start as usual:

Deno.land looks promising, let’s execute the installation command:

curl -fsSL https://deno.land/x/install/install.sh | sh

Deno was installed successfully

That was fast and easy. After adding needed variables to my .bash_profile I can see my deno version:

$ deno --version
deno 1.0.0
v8 8.4.300
typescript 3.9.2

Soooooo let’s try it...wait...I...can...execute...remote...scripts...just...like...this:

$ deno run https://deno.land/std/examples/welcome.ts
Welcome to Deno 🦕

That’s useful...and scary...but they say it’s secure so ¯_(ツ)_/¯

Ok last test in deno.land is the classic web server. I create a new test.ts file, copy the code:

import { serve } from "https://deno.land/std@0.50.0/http/server.ts";
const s = serve({ port: 8000 });
console.log("http://localhost:8000/");
for await (const req of s) {
 req.respond({ body: "Hello World\n" });
}

and run $ deno test.ts

ERROR...It’s $ deno run test.ts

ERROR Uncaught PermissionDenied: network access to "0.0.0.0:8000", 
run again with the --allow-net flag

Here is the security, I have to explicitly allow Deno access to network requests:

$ deno run test.ts --allow-net

ERROR...what about...

$ deno run --allow-net test.ts

SUCCESS --- Hello Denoland

End of exploration #1

Native Typescript support 💙💙💙💙
I like the idea of a strong and controlled standard library.
No package.json, fixed urls for packages. What about updating?

Have you tried Deno? Any thoughts about it?

@albertobeiz

DEV Community: Alberto Beiz

Exploring Denoland #1 - My first stomps with DENO

End of exploration #1