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Is Deno the new Node?
So about 3 months ago, Ryan Dahl (the creator of Node.js) issued 10 Things I Regret About Node.js in JSConf , He goes on including several regrets about design he took over Node.js in 2009. Almost half of his talk, he showed us an experimental prototype called Deno successor of Nodejs which aimed to fix previous problems.
Deno v0.1 has launched and I think that it may be on the right track to replace Node.js in the future.
Deno
Deno is a secure runtime for JavaScript and TypeScript. Imagine if you could write TypeScript without any config files, and bundle it all together into a single ES Module where both the TypeScript support and bundler are present in the core. Thats what it feels like when you get started with Deno.
Its a modern and secure runtime for JavaScript and TypeScript that uses V8 and is built in Rust. Whereas Node.js is written in C++ and JavaScript.
Fun fact: Deno is an anagram of Node. If you sort() node
it becomes deno
.
Deno ships with many features required for writing modern JavaScript & TypeScript, and WebAssembly code.
- bundler
- debugger
- test runner
- code formatter
- docs generator
- WebAssembly support
Deno has some interesting features
- Secure by default.No file, network, or environment access, unless explicitly enabled.
- Single Executable.Ships only a single executable file.
- TypeScript SupportDeno ships with out of the box TypeScript compiler.
- Module systemNo
package.json
, nonode_modules
. Source files can be imported using a relative path, an absolute path or a fully qualified URL of a source file:
import { test } from "https://unpkg.com/[email protected]/testing.ts" import { log } from "./util.ts"
What are the main issues with Node.js?
Any program can write to the filesystem and the network
This might be a security problem, especially when intalling untrusted packages from npm. The[crossenv](https://blog.npmjs.org/post/163723642530/crossenv-malware-on-the-npm-registry)
incident is an example. Ifcrossenv
had not had writing permissions, this would not have happened.The build system (GYP)
Using GYP to build a module that links to a C library is a big pain. In order to have a sane DX youll have to usenode-gyp
(a layer on top of GYP) and maybe other layers (like[nan](https://www.npmjs.com/package/nan)
).The module system and npm
The main problem here is that the module system isnt compatible with browsers so our code isnt fully isomorphic. This is mainly caused by two reasons: storing dependencies innode_modules
and having apackage.json
.
Let's get started with installing Deno
Using PowerShell (Windows):
iwr https://deno.land/x/install/install.ps1 -useb | iex
With Shell:
curl -fsSL https://deno.land/x/install/install.sh | sh
With Homebrew:
brew install deno
Now check if deno
was installed by running the deno --version
command in your terminal.
Simple http server
This example contains a simple http server (app.ts):
import { serve } from "https://deno.land/[email protected]/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" }); }
Run the code:
deno run app.ts
This results into permission error
error: Uncaught PermissionDenied: read access to "http/server.ts", run again with the --allow-read flag $deno$/dispatch_json.ts:40:11 at DenoError ($deno$/errors.ts:20:5) ...
This is because deno allows you to control the granularity of permissions. To run above application you need set some flags indicating deno that particular permission are allowed.
deno run --allow-net app.ts > http://localhost:8000/
Now open up your browser at localhost:8000. You will be see the Hello World text.
Okay this was just a basic demonstration of how you could create simple http server using deno.
See more example here
I have created User REST API in deno feel free to check it out here. Clone the Repo and play around. Contribution are always welcome
Conclusion
There's still a long time until Deno reaches a production-ready state, but I think its on the right path in order to be a better Javascript runtime than Node.js.
Thanks for reading!
Do check my website smithgajjar.me and GitHub here
Follow me on LinkedIn
Original Link: https://dev.to/smithg09/is-deno-the-new-node-7o4
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