deno run permissions model --allow-read --allow-write --allow-net --allow-env permission prompts Deno.version Deno.args environment variables

ES module imports URL imports npm imports jsr imports import maps deno.json imports local modules dynamic import top-level await module caching

Deno.readTextFile Deno.writeTextFile Deno.open Deno.readDir Deno.stat Deno.mkdir Deno.remove Deno.Command process output

Deno.serve request URL parsing request headers request body JSON responses status codes redirect responses streaming responses server abort signal WebSocket upgrade

deno fmt deno lint deno check deno test test steps assertions benchmarks deno task deno doc deno info

deno add lockfile vendor dependencies npm compatibility Node built-ins package.json support workspaces deno compile deno install executable publishing to JSR

fetch AbortController URL and URLSearchParams Web Crypto TextEncoder TextDecoder ReadableStream WritableStream BroadcastChannel Web Workers timers

least-privilege permissions permission scoped paths permission scoped hosts TLS certificates secrets via environment structured logging graceful shutdown error boundaries resource cleanup deployment checklist