DENO - CLI

Deno is a command line program

Deno can grab the scripts from multiple sources, a filename, a url, and '-' to read the file from stdin

deno run main.ts
deno run https://domain.com/main.ts
cat main.ts | deno run -

Anything passed after the script name will be passed as a script argument and not consumed as a Deno runtime flag

-> Example

#Accepted, we grant net permission to file.ts
deno run --allow-net file.ts

#not accepted, --allow-net was passed to Deno.args, throws a net permission error
deno run file.ts --allow-net

Similarly for more info about permissions and cache process and performing in watch mode -> Official Docs

Since #Deno has support for [[TypeScript/Index.docs|TypeScript]], you can customize the built-in #Typescript compiler, formatter and linter.

The configuration file supports .json and .jsonc extensions.

Since v1.18, Deno will automatically detect a deno.json or deno.jsonc configuration file if its in your current working directory or parent directories. Else you can also use --config flag to specify different configuration file.

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Imports and Scopes

Since v1.30, deno.json configuration file acts as an import map for resolving bare specifiers

Example: of deno.json config file

{
	"imports":{
		"std/": "https://deno.land/std@0.199.0/"
	},
	"tasks":{
		"dev": "deno run --watch main.ts"
	}
}

Say main.ts script be

import { assertEquals } from "std/assert/mod.ts";
assertEquals(1,2);

-> The top-level deno.json option importMap along with the --importmap flag can be used to specify the import map in other files.

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Deno Native frameworks/tools/libraries

1. Fresh

   1. It uses a model where you send no JavaScript to clients by default

2. Aleph

3. Ultra

4. Lume

5. Oak

All the above mentioned frameworks have their advantages and tackle the problems that some failed to solve.

More info -> here

Let's Being -> [[Basics]]