deno_install VS deno_std

import { App, Router } from "https://deno.land/x/[email protected]/mod.ts"; const app = new App(); const router = new Router(); // Define your API routes router.get("/hello", (ctx) => { ctx.response.body = "Hello, World!"; }); app.use(router.routes()); app.use(router.allowedMethods()); // Start the server app.listen({ port: 8000 }); console.log("Server is running on http://localhost:8000");

Deno: Deno with one of it's frameworks (like Fresh

lspconfig.denols.setup({ root_dir = lspconfig.util.root_pattern("deno.json", "deno.jsonc"), init_options = { lint = true, unstable = true, suggest = { imports = { hosts = { ["https://deno.land"] = true, ["https://cdn.nest.land"] = true, ["https://crux.land"] = true, }, }, }, }, on_attach = on_attach, })

https://deno.land/install.sh is a redirect to https://deno.land/x/install.sh, which is treated as any /x/ (community) module. These modules are immutable clones of github tags (in this case, https://github.com/denoland/deno_install/). If someone would manage to breach the AWS S3 buckets that we use for module storage, it wouldn't be just a problem for installation of the deno CLI, but a problem for any module on the registry.

In any case, Deno ships a lot more things but this is enough to get us started. Any additional information can be found on the official repository url that I will be linking at the end of the article. As for a little start, since nodejs has been used as a very popular web server, I thought it might be interesting to start building a deno version of it. To start off, let's install deno. Depending on your OS you might want to refer to Install Docs

You can find a list of different installation methods on the official deno.land documentation and the deno_install repo.

You can install Deno in a few different ways. I chose to install it with brew install deno, but you can check their docs for other methods.

See deno_install and releases for other options.

For reference (for the issues you mentioned): 1. This issue was opened almost immediately to solve the weird .only function not working https://github.com/denoland/deno_std/issues/2979 2. That looks weird to me, will get back to you on this one since it should work I think 3. Generally polluting the global namespace isn't great, but because we're only polluting the namespace of a module (and we choose what parts to import), I personally find it quite freeing. I entirely understand how that might feel awkward. 4. you CAN specifying only writing to certain directories! --allow-write=/path/to/dir would allow that!

At least for the ones related to trees, it's just a renaming. Below is a link to the PR. When I initially implemented these trees, I chose the names BSTree and RBTree to keep the names short. I'm guessing the person that proposed renaming them did so to make it more obvious what they are.

https://github.com/denoland/deno_std/pull/2400

The standard library is separate from the runtime. It wouldn't break backward compatibility if you were to update. For example, if you were importing RBTree and upgraded Deno to the latest release, it would keep working just fine. You would only really need to switch to using RedBlackTree instead if there was a change made to it that you wanted.

I think the only time you would need to update your standard module imports to be able to use newer versions of the Deno runtime if the standard module were depending on runtime APIs that have a breaking change.

It is like Demo deprecating fs.exists().[1]

[1]https://github.com/denoland/deno_std/discussions/2102

This was fun to read through.

I would need to profile the code, but the startup time being bad for Deno seems like maybe a combination of the code in here being unoptimized:

https://github.com/denoland/deno_std/blob/0ce558fec1a1beeda3...

(Ex. Lots of temporaries)

And usage of the readFileSync+TextDecoder API instead of readTextFile (which is also a docs issue since it's suggests the first one). It seems the code loads the 100MB into memory, then converts to another 100MB of utf8, then parses with that inefficient csv decoder. The rust and go versions look to be doing stream/incremental processing instead.

But it there's some talk to reconsider it

Sorry to hear that. I want to provide expect API in deno_std in the future: https://github.com/denoland/deno_std/issues/1779

I just migrated the module to Deno and rewrote the test cases using the Deno test runner. Also contributed a bug fix to the test runner that I encountered during the migration. An npm version is still available and automatically generated from the Deno code via a small bash script (rewriting imports, adding an index.ts, etc.).

Much of Node.js is written in C, yet it's still called Node.js.

Deno has some JavaScript/TypeScript in it. On GitHub https://github.com/denoland/deno is 22.8% JavaScript and 13.2% TypeScript, and https://github.com/denoland/deno_std is 68.2% JavaScript and 31.6% TypeScript.

So to me it's misleading about the name, but not about what Deno is written in.