Bun : Le Runtime JavaScript Prenant Node.js Et Deno

Bun est un nouveau runtime JavaScript ultra rapide qui fait parler tout le monde. Pour comprendre pourquoi Bun est si important, examinons d'abord un historique important de JavaScript.

Qu'est-ce qu'un moteur JavaScript ?

Lorsque JavaScript a été créé pour la première fois, il ne fonctionnait que dans les navigateurs, à l'origine Netscape Navigator. Cependant, les développeurs avaient besoin d'un logiciel capable de lire le code JavaScript et de le transformer en quelque chose pouvant fonctionner sur l'ordinateur. Cette technologie est connue sous le nom de moteur JavaScript. Au moment de la rédaction de cet article, il existe trois principaux moteurs JavaScript qui alimentent vos navigateurs préférés :

• V8 : créé par Google pour Chrome
• SpinderMonkey : créé par Mozilla pour Firefox
• JavaScriptCore : créé par Apple pour Safari

Chaque moteur JavaScript a ses propres différences mineures dans sa prise en charge de la spécification JavaScript, la rapidité avec laquelle il adopte les nouvelles fonctionnalités JavaScript, ainsi que sa facilité d'utilisation et ses performances.

Présentation des environnements d'exécution JavaScript

Finalement, en 2009, Ryan Dahl a commencé à développer un outil qui permettrait à JavaScript de s'exécuter en dehors du navigateur. Lors du choix d'un moteur pour construire cet outil, il a choisi le V8.

Ce qu'il a créé était un runtime JavaScript, un outil pour exécuter JavaScript en dehors du navigateur. Il a donné à JavaScript un accès à votre réseau informatique plus large et à vos systèmes de fichiers pour créer des serveurs Web et tout type d'application auquel vous pouvez penser.

Node.js a depuis explosé en popularité, devenant un outil incontournable dans le développement Web frontend et backend. Lorsque Node.js a été créé, de nombreux standards JavaScript modernes n'existaient pas encore, comme l'API Fetch, les modules ES, etc.

Voyant la croissance de TypeScript et la robustesse des standards du web, Ryan Dahl a créé un successeur de Node.js en utilisant Rust, appelé Deno . Deno a offert une amélioration de la vitesse, une adoption des normes Web et une prise en charge de première classe de TypeScript et JSX.

Qu'est-ce que le Bun ?

En 2022, l'ancien développeur de Stripe Jared Sumner a publié Bun . Bun est un environnement d'exécution développé dans le langage de programmation Zig, qui adopte également les normes Web mais vise la compatibilité avec les API Node.js, afin que les développeurs puissent facilement migrer le code existant.

L'un des choix les plus intéressants est que Bun utilise JavaScriptCore comme moteur, contrairement à Node.js et Deno, qui utilisent V8. Le résultat est une exécution ultra rapide qui offre également plusieurs fonctionnalités de qualité de vie pour les développeurs JavaScript.

Bun a également une intégration de première classe de TypeScript et JSX. Il vise à fournir de nombreuses fonctionnalités des transpileurs, comme Babel, et des Bundlers comme Webpack, Rollup, Snowpack et Vite.

Prendre Bun pour un essai routier

Pour commencer avec Bun, nous devons d'abord l'installer. Selon la documentation de Bun, l'installation ne nécessite que la commande suivante :

curl https://bun.sh/install | bash

Gardez à l'esprit que cette commande ne fonctionnera que sur Mac et Linux. Donc, si vous utilisez Windows, vous devrez configurer le sous-système Windows pour Linux pour installer Bun.

Une fois l'installation terminée, assurez-vous de lire l'invite de confirmation avec les instructions pour ajouter Bun à votre fichier PATH. Il vous faudra ajouter les lignes suivantes à vos fichiers .bashrcou :.zshrc

BUN_INSTALL="/home/<username>/.bun"
PATH="$BUN_INSTALL/bin:$PATH"

Maintenant, si vous exécutez bun--version, vous devriez obtenir un numéro de version imprimé confirmant que vous l'avez installé correctement.

Écrire et exécuter notre premier script Bun

Créez un fichier appelé script.jset ajoutez-y le code suivant :

Bun.serve({
    fetch(request){
        return new Response("Hello World")
    }
})
console.log("Listening on Port 3000")

Bun.servelance le serveur et prend un objet avec les configurations du serveur. À chaque requête, l'objet de requête est transmis à une fonction stockée en tant que fetchpropriété sur l'objet de configuration.

Nous pouvons exécuter Bun.serveen utilisant la commande bun run script.jspuis en allant localhost:3000voir la réponse à notre demande. Si nous voulions changer le port sur lequel il servira, nous pouvons ajouter une portpropriété à l'objet passé à Bun.serve.

Écrire des fichiers avec Bun

Bun a une API assez simple pour écrire dans des fichiers. Modifions notre script pour écrire dans un fichier chaque fois que nous soumettons une requête :

let count = 1
Bun.serve({
    fetch(request){
        Bun.write(`${count}.txt`, request.url)
        count += 1
        return new Response("Hello World")
    },
})
console.log("Listening on Port 3000")

Exécutez le code ci-dessus et visitez localhost:3000/cheese, et vous verrez deux nouveaux fichiers créés, 1.txtet 2.txt. Le premier argument de Bun.writeest la cible de l'écriture, comme un fichier ou stdout, et le second argument est ce qu'il faut écrire.

Prise en charge intégrée de SQLite3

Contrairement à d'autres runtimes JavaScript, vous n'avez pas besoin d'installer SQLite3 car il est intégré et prêt à l'emploi. Créons un nouveau fichier appelé db.jsavec le code suivant :

import { Database } from "bun:sqlite";
// Create a new Database File
const db = new Database("db.sqlite3");
// Create a table in the database
db.run("CREATE TABLE IF NOT EXISTS cheeses (name VARCHAR(100));")
// Insert Some Values into the table
db.run("INSERT INTO cheeses VALUES ('gouda'), ('munster'), ('brie');")
// Query the table
const result = db.query("SELECT * FROM cheeses;").all()
// Log results
console.log(result)

Exécutez le code avec bun run db.js, et vous devriez voir les enregistrements insérés enregistrés sur le terminal.

Utiliser .envdes fichiers avec Bun

Une autre touche vraiment agréable est la possibilité d'utiliser .envdes fichiers prêts à l'emploi. Vous pouvez simplement y accéder avec process.envcomme dans Node.js sans avoir besoin d'installer de bibliothèques. Créez un .envfichier avec la commande suivante :

VARIABLE=cheddar

Maintenant, mettons à jour notre script.jsavec le code suivant :

// let count = 1
Bun.serve({
    fetch(request){
        // Bun.write(`${count}.txt`, request.url)
        // count += 1
        return new Response(process.env.VARIABLE)
    },
})
console.log("Listening on Port 3000")

Maintenant, lorsque nous exécutons bun run script.jset visitons localhost:3000, nous devrions voir les informations de notre .envfichier renvoyées.

Conclusion

En plus d'être super rapide, Bun possède de très belles fonctionnalités qui facilitent la plupart des tâches les plus banales telles que l'écriture de fichiers, la gestion de bases de données simples et l'utilisation de variables environnementales.

Bun dépassera-t-il Deno et défiera-t-il Node.js pour son trône ? Nous devrons attendre et voir. Bun va au moins, comme Deno, montrer de nombreuses innovations que Node.js peut adopter tout en se taillant un espace à part.

Quoi qu'il en soit, c'est une grande victoire pour les développeurs JavaScript du monde entier d'avoir un autre environnement d'exécution dans l'espace. Au moment de la rédaction de cet article, Bun en est encore au début de son développement avec de nombreuses API et fonctionnalités non encore implémentées . Cependant, ce qui est disponible jusqu'à présent est assez impressionnant, il vaut donc la peine de le suivre.

N'oubliez pas de regarder cette vidéo de mon premier test de Bun et de laisser un commentaire si vous avez des questions. Bon codage !

Source : https://blog.logrocket.com/bun-javascript-runtime-taking-node-js-deno/

#nodejs #deno 

What is GEEK

Buddha Community

NBB: Ad-hoc CLJS Scripting on Node.js

Nbb

Not babashka. Node.js babashka!?

Ad-hoc CLJS scripting on Node.js.

Status

Experimental. Please report issues here.

Goals and features

Nbb's main goal is to make it easy to get started with ad hoc CLJS scripting on Node.js.

Additional goals and features are:

• Fast startup without relying on a custom version of Node.js.
• Small artifact (current size is around 1.2MB).
• First class macros.
• Support building small TUI apps using Reagent.
• Complement babashka with libraries from the Node.js ecosystem.

Requirements

Nbb requires Node.js v12 or newer.

How does this tool work?

CLJS code is evaluated through SCI, the same interpreter that powers babashka. Because SCI works with advanced compilation, the bundle size, especially when combined with other dependencies, is smaller than what you get with self-hosted CLJS. That makes startup faster. The trade-off is that execution is less performant and that only a subset of CLJS is available (e.g. no deftype, yet).

Usage

Install nbb from NPM:

$ npm install nbb -g

Omit -g for a local install.

Try out an expression:

$ nbb -e '(+ 1 2 3)'
6

And then install some other NPM libraries to use in the script. E.g.:

$ npm install csv-parse shelljs zx

Create a script which uses the NPM libraries:

(ns script
  (:require ["csv-parse/lib/sync$default" :as csv-parse]
            ["fs" :as fs]
            ["path" :as path]
            ["shelljs$default" :as sh]
            ["term-size$default" :as term-size]
            ["zx$default" :as zx]
            ["zx$fs" :as zxfs]
            [nbb.core :refer [*file*]]))

(prn (path/resolve "."))

(prn (term-size))

(println (count (str (fs/readFileSync *file*))))

(prn (sh/ls "."))

(prn (csv-parse "foo,bar"))

(prn (zxfs/existsSync *file*))

(zx/$ #js ["ls"])

Call the script:

$ nbb script.cljs
"/private/tmp/test-script"
#js {:columns 216, :rows 47}
510
#js ["node_modules" "package-lock.json" "package.json" "script.cljs"]
#js [#js ["foo" "bar"]]
true
$ ls
node_modules
package-lock.json
package.json
script.cljs

Macros

Nbb has first class support for macros: you can define them right inside your .cljs file, like you are used to from JVM Clojure. Consider the plet macro to make working with promises more palatable:

(defmacro plet
  [bindings & body]
  (let [binding-pairs (reverse (partition 2 bindings))
        body (cons 'do body)]
    (reduce (fn [body [sym expr]]
              (let [expr (list '.resolve 'js/Promise expr)]
                (list '.then expr (list 'clojure.core/fn (vector sym)
                                        body))))
            body
            binding-pairs)))

Using this macro we can look async code more like sync code. Consider this puppeteer example:

(-> (.launch puppeteer)
      (.then (fn [browser]
               (-> (.newPage browser)
                   (.then (fn [page]
                            (-> (.goto page "https://clojure.org")
                                (.then #(.screenshot page #js{:path "screenshot.png"}))
                                (.catch #(js/console.log %))
                                (.then #(.close browser)))))))))

Using plet this becomes:

(plet [browser (.launch puppeteer)
       page (.newPage browser)
       _ (.goto page "https://clojure.org")
       _ (-> (.screenshot page #js{:path "screenshot.png"})
             (.catch #(js/console.log %)))]
      (.close browser))

See the puppeteer example for the full code.

Since v0.0.36, nbb includes promesa which is a library to deal with promises. The above plet macro is similar to promesa.core/let.

Startup time

$ time nbb -e '(+ 1 2 3)'
6
nbb -e '(+ 1 2 3)'   0.17s  user 0.02s system 109% cpu 0.168 total

The baseline startup time for a script is about 170ms seconds on my laptop. When invoked via npx this adds another 300ms or so, so for faster startup, either use a globally installed nbb or use $(npm bin)/nbb script.cljs to bypass npx.

Dependencies

NPM dependencies

Nbb does not depend on any NPM dependencies. All NPM libraries loaded by a script are resolved relative to that script. When using the Reagent module, React is resolved in the same way as any other NPM library.

Classpath

To load .cljs files from local paths or dependencies, you can use the --classpath argument. The current dir is added to the classpath automatically. So if there is a file foo/bar.cljs relative to your current dir, then you can load it via (:require [foo.bar :as fb]). Note that nbb uses the same naming conventions for namespaces and directories as other Clojure tools: foo-bar in the namespace name becomes foo_bar in the directory name.

To load dependencies from the Clojure ecosystem, you can use the Clojure CLI or babashka to download them and produce a classpath:

$ classpath="$(clojure -A:nbb -Spath -Sdeps '{:aliases {:nbb {:replace-deps {com.github.seancorfield/honeysql {:git/tag "v2.0.0-rc5" :git/sha "01c3a55"}}}}}')"

and then feed it to the --classpath argument:

$ nbb --classpath "$classpath" -e "(require '[honey.sql :as sql]) (sql/format {:select :foo :from :bar :where [:= :baz 2]})"
["SELECT foo FROM bar WHERE baz = ?" 2]

Currently nbb only reads from directories, not jar files, so you are encouraged to use git libs. Support for .jar files will be added later.

Current file

The name of the file that is currently being executed is available via nbb.core/*file* or on the metadata of vars:

(ns foo
  (:require [nbb.core :refer [*file*]]))

(prn *file*) ;; "/private/tmp/foo.cljs"

(defn f [])
(prn (:file (meta #'f))) ;; "/private/tmp/foo.cljs"

Reagent

Nbb includes reagent.core which will be lazily loaded when required. You can use this together with ink to create a TUI application:

$ npm install ink

ink-demo.cljs:

(ns ink-demo
  (:require ["ink" :refer [render Text]]
            [reagent.core :as r]))

(defonce state (r/atom 0))

(doseq [n (range 1 11)]
  (js/setTimeout #(swap! state inc) (* n 500)))

(defn hello []
  [:> Text {:color "green"} "Hello, world! " @state])

(render (r/as-element [hello]))

Promesa

Working with callbacks and promises can become tedious. Since nbb v0.0.36 the promesa.core namespace is included with the let and do! macros. An example:

(ns prom
  (:require [promesa.core :as p]))

(defn sleep [ms]
  (js/Promise.
   (fn [resolve _]
     (js/setTimeout resolve ms))))

(defn do-stuff
  []
  (p/do!
   (println "Doing stuff which takes a while")
   (sleep 1000)
   1))

(p/let [a (do-stuff)
        b (inc a)
        c (do-stuff)
        d (+ b c)]
  (prn d))

$ nbb prom.cljs
Doing stuff which takes a while
Doing stuff which takes a while
3

Also see API docs.

Js-interop

Since nbb v0.0.75 applied-science/js-interop is available:

(ns example
  (:require [applied-science.js-interop :as j]))

(def o (j/lit {:a 1 :b 2 :c {:d 1}}))

(prn (j/select-keys o [:a :b])) ;; #js {:a 1, :b 2}
(prn (j/get-in o [:c :d])) ;; 1

Most of this library is supported in nbb, except the following:

• destructuring using :syms
• property access using .-x notation. In nbb, you must use keywords.

See the example of what is currently supported.

Examples

See the examples directory for small examples.

Also check out these projects built with nbb:

• c64core: retrocompute aesthetics twitter bot
• gallery.cljs: script to download walpapers from windowsonearth.org.
• nbb-action-example: example of a Github action built with nbb.

API

See API documentation.

Migrating to shadow-cljs

See this gist on how to convert an nbb script or project to shadow-cljs.

Build

Prequisites:

• babashka >= 0.4.0
• Clojure CLI >= 1.10.3.933
• Node.js 16.5.0 (lower version may work, but this is the one I used to build)

To build:

• Clone and cd into this repo
• bb release

Run bb tasks for more project-related tasks.

Download Details:
Author: borkdude
Download Link: Download The Source Code
Official Website: https://github.com/borkdude/nbb 
License: EPL-1.0

#node #javascript

Hire Dedicated Node.js Developers - Hire Node.js Developers

If you look at the backend technology used by today’s most popular apps there is one thing you would find common among them and that is the use of NodeJS Framework. Yes, the NodeJS framework is that effective and successful.

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WebClues Infotech offers different levels of experienced and expert professionals for your app development needs. So hire a dedicated NodeJS developer from WebClues Infotech with your experience requirement and expertise.

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Why use Node.js for Web Development? Benefits and Examples of Apps

Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices. 

Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend. 

What is Node.js? 

Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently. 

The extent of V8 is to change JS program situated code into machine code — so JS turns into a broadly useful language and can be perceived by servers. This is one of the advantages of utilizing Node.js in web application development: it expands the usefulness of JavaScript, permitting designers to coordinate the language with APIs, different languages, and outside libraries.

What Are the Advantages of Node.js Web Application Development? 

Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers. 

Amazing Tech Stack for Web Development 

The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module. 

Alongside prevalence, Node.js additionally acquired the fundamental JS benefits: 

• quick execution and information preparing; 
• exceptionally reusable code; 
• the code is not difficult to learn, compose, read, and keep up; 
• tremendous asset library, a huge number of free aides, and a functioning local area. 

In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development). 

Designers Can Utilize JavaScript for the Whole Undertaking 

This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable. 

In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based. 

A Quick Environment for Microservice Development 

There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations). 

Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.

Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while. 

Versatile Web Application Development 

Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements. 

Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility. 

Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root. 

What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations. 

Control Stream Highlights

Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation. 

In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.

 

Final Words

So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development. 

I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call. 

Good Luck!

Original Source

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Node JS Development Advantages - How Your App Will Benefit From This JavaScript Framework

Web development has been controlling the JavaScript system features for many years. Many big online sites use Java Script for their everyday operations. And recently there has been a change and a shift towards cross-platform mobile application development. The main software frameworks in work these days are React native, apache Cordova, native script and hybrid tools. In the last ten years, Node.JS has been used as a backend development framework. Developers nowadays want to learn and use the same technologies for one entire website. They do not want to learn an entire language for server development. And Node.JS is able to adapt all the functions and syntaxes to the backend services from JavaScript. If you do not know the languages or syntaxes for Node JS development, you can look for an online guide. These guides have a detailed overview of the additional functions and basic systems. You will also find simple tasks in these guides. To read more click on the link.

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