Bun is an all-in-one toolkit for JavaScript and TypeScript apps. It ships as a single executable. At its core is the Bun runtime, a fast JavaScript runtime designed as a drop-in replacement for Node.js. It is a fast, all-in-one toolkit for running, building, testing, and debugging JavaScript and TypeScript, from a single file to a full-stack application.
Bun is considered to be 5x faster than NodeJS. It has inbuilt support for reading .env files, Node monitoring, Http fetch, Web sockets. Bun transpiler can run <code>.js</code>, <code>.ts</code>, <code>.cjs</code>, <code>.mjs</code>, <code>.jsx</code>, and <code>.tsx</code> files.&nbsp; It supports both CommonJS to ES modules.
Bun is built using Apple's <a href="https://webkit.org/" target="_blank" rel="noopener">WebKit</a> engine. WebKit is the engine that powers Safari and is used by billions of devices every day. It's fast, efficient, and has been battle-tested for decades.
Bun is orders of magnitude faster than npm, yarn, and pnpm. It uses a global module cache to avoid redundant downloads from the npm registry and uses the fastest system calls available on each operating system.
You can run Bun with --hot to enable hot reloading, which reloads your application when files change.
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Bun is incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one 

Bun - Fast JavaScript runtime designed as a drop-in replacement for Node.js

Yarn is fast, reliable, and secure dependency management. Yarn caches every package it has downloaded, so it never needs to download the same package again. It also does almost everything concurrently to maximize resource utilization. This means even faster installs. 
 
Using a detailed but concise lockfile format and a deterministic algorithm for install operations, Yarn is able to guarantee that any installation that works on one system will work exactly the same on another system. Yarn uses checksums to verify the integrity of every installed package before its code is executed. 
 
It supports offline mode, If you've installed a package before, then you can install it again without an internet connection. The same dependencies will be installed in the same exact way on any machine, regardless of installation order.

Yarn is fast, reliable, and secure dependency management. Yarn caches every package it has downloaded, so it never needs to download the same package again. It also does almost everything concurrently to maximize resource utilization. This means even faster installs. 

yarn - Fast, reliable, and secure dependency management

A tool for managing JavaScript projects with multiple packages.Splitting up large codebases into separate independently versioned packages is extremely useful for code sharing. However, making changes across many repositories is messy and difficult to track, and testing across repositories gets complicated really fast. Lerna is a tool that optimizes the workflow around managing multi-package repositories with git and npm.

lerna - A tool for managing JavaScript projects with multiple packages

 On macOS, it is as simple as brew upgrade fnm. On other operating systems, upgrading fnm is almost the same as installing it. To prevent duplication in your shell config file add --skip-shell to install command.

Fast Node Manager (fnm) - Fast and simple Node.js version manager, built in Rust.  It is single file, easy installation, instant startup. 



fnm - Fast and simple Node.js version manager, built in Rust

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Bun - Fast JavaScript runtime designed as a drop-in replacement for Node.js

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Bun - Fast JavaScript runtime designed as a drop-in replacement for Node.js

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lerna - A tool for managing JavaScript projects with multiple packages

fnm - Fast and simple Node.js version manager, built in Rust

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