Bun

Setup

vars gen config.vars --platform serverless

Bun ships with Web Crypto — the generated module runs as-is.

Usage

import { getVars } from '#vars'

Bun.serve({
  port: 3000,
  async fetch() {
    const vars = await getVars(process.env)
    return new Response(`hello from ${vars.APP_NAME}`)
  },
})

Secrets

Bun runs under the process environment, so set VARS_KEY and VARS_ENV wherever you manage env vars:

• Shell: export VARS_KEY=... / export VARS_ENV=prod
• systemd unit: Environment="VARS_KEY=...", Environment="VARS_ENV=prod"
• Docker: ENV VARS_ENV=prod and inject VARS_KEY via --env-file or a secrets manager
• Kubernetes: Secret for VARS_KEY, ConfigMap for VARS_ENV

Local dev

{
  "scripts": {
    "dev": "vars run --env dev -- bun --hot src/index.ts"
  }
}