I want to convert a Node.js project to Deno. Is there any guide available?
My current project has lots of NPM files and it's already in TypeScript.
Any tips?
Node. js has a plugin system that is incompatible with Deno, and Deno will never support Node.
Node. js uses a package manager like npm or yarn to download third-party packages from the npm registry into a node_modules directory and a package. json file to keep track of a project's dependencies. Deno does away with those mechanisms in favor of a more browser-centric way of using third-party packages: URLs.
An experienced Node. js developer will be able to pick up Deno and start running with it almost straight away. Deno is worth playing around with if you're already an experienced Node. js developer because you might learn some new concepts and have a small advantage when Deno starts to become popular.
As the project matures there will be easier ways to convert a Node.js project to Deno. IMO for big projects working perfectly on Node.js it's not worth it to migrate them. Deno & Node.js can live together it's not one or the other. Build new projects on Deno if you prefer instead of migrating old ones. Share Improve this answer
Starting with v1.15 Deno provides Node compatiblity mode that makes it possible to run a subset of programs authored for Node.js directly in Deno. Compatiblity mode can be activated by passing --compat flag in CLI.
We can use Denon as we use deno run to execute scripts. Jest, Jasmine, Ava... In the Node.js ecosystem there are a lot of alternatives for test runners. However, there isn't one official way to test the Node.js code. In Deno, there is an official way, you can use the testing std library. Webpack, Parcel, Rollup...
Node.js compability mode Starting with v1.15 Deno provides Node compatiblity mode that makes it possible to run a subset of programs authored for Node.js directly in Deno. Compatiblity mode can be activated by passing --compat flag in CLI.
Check out Denoify, it's a build tool that does what you want. You don't have to write the port the tool do it for you, it is all detailed in the docs.
Disclosure: I am the author.
Deno and Node.js APIs are not compatible, of course you will be able to reuse all javascript/typescript code but you'll need to refactor or add polyfills.
To ease migration Deno provides a Node Compatibility library, std/node
, which still needs a lot of work.
Fortunately require
is one of the already supported polyfills
import { createRequire } from "https://deno.land/std/node/module.ts";
const require = createRequire(import.meta.url);
// Loads native module polyfill.
const path = require("path");
// Visits node_modules.
const leftPad = require("left-pad");
console.log(leftPad('5', 5, '0'))
If you run that example:
npm i left-pad
deno run --allow-read node.js
// 00005
As you can see left-pad
was loaded correctly from node_modules/
. So for NPM packages that do not rely on Node.js API, you can easily require them using std/node
.
Here's a list of all supported modules
Right now, for the packages that rely heavily on Node.js API, the best thing you can do is rewrite them using Deno API.
As the project matures there will be easier ways to convert a Node.js project to Deno.
IMO for big projects working perfectly on Node.js it's not worth it to migrate them. Deno & Node.js can live together it's not one or the other. Build new projects on Deno if you prefer instead of migrating old ones.
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