Runjs alternative2/25/2024 ![]() ![]() I really like the decision of keeping the type checking and execution apart by default. And it does it in a really smart way by keeping a cache so that only what is necessary gets checked and transpiled during consecutive runs. So instead of setting up our transpilation step by hand, as we would do in a Node.js project, Deno takes care of all of it. TypeScriptĭid you notice that we just ran a TypeScript file like it’s nothing? One of Deno’s goals was to provide a first-class experience for developing TypeScript projects. For example, running deno run -allow-net=() main.ts () will give network access to the main.ts script but only for the domain. We can use deno run with different flags to give granular permissions to scripts. Of course, we don’t have to be prompted every time. In Deno, scripts are sandboxed by default, and if they need some access, you will be prompted for it. The idea is that your linter doesn’t need to send anything over the network, nor write permissions to your entire computer. No file, network, or even environment access is given to scripts unless explicitly enabled. Let’s try running this code with deno run main.ts: Another thing to notice is the Deno global variable that provides us with many server-side, or Deno-specific APIs. It gets a URL from the command-line arguments, fetches the given website, converts it to Uint8Array, and prints it to the standard output.ĭeno tries to use modern features and web standards wherever possible, so it shouldn’t surprise us that we can use top-level await and that fetch is available without any imports. We are ready to write our first Deno program! Here is an example taken from the official docs: // main.tsĬonst body = new Uint8Array(await res.arrayBuffer()) You can check out the full list of integrations here. ![]() It also offers CLI autocompletion’s for popular shells. In my case, I simply added an official Deno extension to VS Code and enabled it in my workspace.ĭeno has LSP integrations for a lot of editors/IDEs. The next step is to set up the development environment in your IDE. After running the script above and adding Deno to the PATH variable, we are good to go. ![]() To get started let’s install Deno by running: curl -fsSL | shįor alternative ways to install Deno, check out their installation page.ĭeno is just a single binary executable with no external dependencies. Let me take you on a short tour of some features I have found especially interesting. ![]() Currently, migrating a Node project to Deno may be very difficult.Still a little immature some APIs and methods are unstable or not ready.For example fetch, WebSocket, or even localStorage. Adopts web platform standards for better DX.Built-in linter, formatter, and test runner.Deno is gaining popularity as a more secure and simpler alternative to Node.js. Some of its key features include first-class TypeScript support, a built-in linter, formatter, and test runner, and the ability to bundle scripts into a single JavaScript file or executable. Deno was designed to address some of the shortcomings of Node.js, such as its security model, build system, and lack of built-in tooling. Vendored-by-default node_modules take up a lot of space and don’t scale with the numbers of projectsĭeno is a JavaScript and TypeScript runtime that was also created by Ryan Dahl, but almost 10 years later.Runs only JavaScript – TypeScript projects require additional tooling such as ts-node or swc-node.Overall, it is pretty nice and easy to use.Extremely popular → many community projects, resources, job offers, etc.In fact, it is so popular that there is no need to talk too much about it. It is much older and by far more popular than the alternatives. The original JS backend runtime, Node, was written in 2009 by Ryan Dahl. The arrival of environments for running JavaScript outside of the browser context encouraged people to write servers, CLIs, and even machine learning algorithm models in pure JS.Īlthough Node.js is the de facto standard for running JavaScript on the server, not everyone is ecstatic with it, especially not its author!ġ0 Things I Regret About Node.js - Ryan Dahl - JSConf EU Node This law was written two years prior to the inception of Node.js and turned out to be spot on. Atwood’s law states that any application that can be written in JavaScript will eventually be written in Javascript. ![]()
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