deno

name	deno
description	Rules for using Deno
metadata	{"url":"https://gist.github.com/kuboon/b0d7c4384a9baf3c650be6d6fdd5665a","updated_on":"2026-04-01T00:00:00.000Z"}

CI

add root deno.json file:

{
  "tasks": {
    "lint": "deno fmt && deno lint && deno check",
    "check": "deno lint && deno check && deno fmt --check"
  }
}

run deno task lint locally on every commit.

.github/workflows/ci.yml

name: CI
on:
  push:
    branches: ["main"]
jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6
      - uses: denoland/setup-deno@v2
      - run: deno task check

Imports

bad

import { serve } from "https://deno.land/std@0.177.0/http/server.ts";

good

run

• deno add jsr:@std/http
• deno add npm:tailwindcss to add the import map, then

import { serve } from "@std/http/server.ts";
import { serve } from "tailwindcss";

Permissions

bad

deno run --allow-net server.ts

good

Write a deno.json file in the root of your project:

{
  "permissions": {
    "default": {
      "net": ["example.com", "api.example.com"],
      "read": ["./data/*"],
      "env": {
        "ignore": true,
        "allow": ["API_KEY", "DATABASE_URL"]
      }
    },
    "build": {
      "net": ["deno.land"],
      "read": ["./src/*"],
      "write": ["./dist/*"]
    }
  }
}

Then run your script with the -P flags:

deno run -P server.ts
deno run -P=build build.ts

reference

• https://github.com/denoland/deno/blob/main/cli/schemas/config-file.v1.json
• https://docs.deno.com/runtime/fundamentals/configuration/#permissions