hello-deno

Environment

$ deno --version
deno 1.35.0 (release, aarch64-apple-darwin)
v8 11.6.189.7
typescript 5.1.6

Table of Contents of Deno Official Manual

Examples

Pokemon API

Run the following command and see http://localhost:8080/?pokemonNumber=151 on your browser.

deno task pokemon

Build and run:

deno task compile:pokemon
./pokemon

Deno CLI Commands

Init Project

deno init creates 4 files below:

main.ts
main_test.ts
main_bench.ts
deno.jsonc

deno init

Run the Program

Run Local Files

deno run main.ts

Run Local file with watch mode (hot reload)

See docs about watch mode for more details.

deno run --watch main.ts

Run local file with permissions

Deno provides secure defaults. Unless specifically allowed, scripts can’t access files (read / write files), the environment, or the network.

Allow "read"

deno run --allow-read main.ts

Allow "write"

deno run --allow-write main.ts

Allow "network access"

deno run --allow-net main.ts

Warning 引数の渡し方に注意。渡し方によって Deno ランタイムのフラグとして consume されない場合がある。詳しくは 2.4 Command Line Interface - Script arguments を参照。

Run remote file

deno run [URL]

Some examples of running remote files:

deno run https://deno.land/std@0.193.0/examples/welcome.ts
# Welcome to Deno!

deno run --allow-read https://deno.land/std@0.193.0/examples/cat.ts main.ts
# export function add(a: number, b: number): number {
#   return a + b;
# }
#
# // Learn more at https://deno.land/manual/examples/module_metadata#concepts
# if (import.meta.main) {
#   console.log("Add 2 + 3 =", add(2, 3));
# }

See Deno std/examples for more examples.

Run tasks

Tasks are defined in deno.jsonc. See 7.10 deno task

deno task dev

Example of deno.jsonc

{
  "tasks": {
    "dev": "deno run --watch main.ts"
  }
}

Run tests

See Deno official Manual 3.8 Testing.

deno test

Run benchmarks

deno bench

Deno tips

Debugging

See Deno official Manual 3.9 Debugging.

nukopy/hello-deno