using env vars in deno

1. in shell / deno deploy / runtime

1a. define them

• in shell, define and export them like

  export AWS_REGION="ap-southeast-1"
  

• in deno deploy, define them in :

  project settings > environment variables
  

• in run time : with the deno runtime API

  Deno.env.set(key: string, value: string): void
  

  official reference

1b. access them

with the deno runtime API

Deno.env.get(key: string): string | undefined

official reference

2. in .env file

1a. define them

put the file / symlink it to project root :

[project root]/.env

1b. access them

with deno standard library dotenv.

assuming an .env file like :

VAR_1="ap-southeast-1"

sameple codes to load it :

import { load } from "https://deno.land/std/dotenv/mod.ts";
const env = await load();
const var_1 = env["VAR_1"];

some more official references( but they somehow interchange all of the above here and there and made them slightly confusing ).