Awesome
Learning Deno
Just one of the things I'm learning. https://github.com/hchiam/learning
https://en.wikipedia.org/wiki/Deno_(software)
Motivation (vs Node.js)
Basically more secure by default, requiring you to explicitly specify what you want/allow access to. Instead of npm and node_modules, you can get deps from https URLs (e.g.: import * as log from "https://deno.land/std/log/mod.ts";). Typescript support out of the box.
Install steps
Then get updates with deno upgrade.
More
deno run https://deno.land/std/examples/welcome.ts
or:
import { serve } from "https://deno.land/std@0.50.0/http/server.ts";
for await (const req of serve({ port: 8000 })) {
req.respond({ body: "Hello World\n" });
}
(You can try this ^ with deno run demo.ts and then deno run --allow-net demo.ts)
The last example uses https://deno.land/std@0.50.0/http/server.ts
File reading example
const { stdout, open, copy, args } = Deno;
for (let i = 0; i < args.length; i++) {
const filename = args[i]; // args = CLI arguments
const file = await open(filename);
console.log();
await copy(file, stdout); // zero-copy async copy: file -> stdout
console.log();
}
deno run --allow-read cat.ts myfile.txt
Set up hot reload
Once:
deno install --allow-read --allow-run --allow-write --allow-net -f --unstable https://deno.land/x/denon@v2.2.0/denon.ts
Then to get http://localhost:8000 running:
denon run --allow-net demo.ts
You can edit demo.ts and then refresh http://localhost:8000 to see it updated - without having to restart in the CLI!
If you see bash: denon: command not found in the CLI, you might need this set up in your .bash_profile:
# replace <your account> with your computer's account name:
export PATH="/Users/<your account>/.deno/bin:$PATH"
or
# replace <your account> with your computer's account name:
export PATH=$PATH:/Users/<your account>/.deno/bin:$PATH