UnJS
Logo of std-env

std-env

Runtime agnostic JS utils

Runtime agnostic JS utils

Installation

# Using npm
npm i std-env

# Using pnpm
pnpm i std-env

# Using yarn
yarn add std-env

Usage

// ESM
import { env, isDevelopment, isProduction } from "std-env";

// CommonJS
const { env, isDevelopment, isProduction } = require("std-env");

Flags

  • hasTTY
  • hasWindow
  • isDebug
  • isDevelopment
  • isLinux
  • isMacOS
  • isMinimal
  • isProduction
  • isTest
  • isWindows
  • platform
  • isColorSupported
  • nodeVersion
  • nodeMajorVersion

You can read more about how each flag works from https://raw.githubusercontent.com/unjs/std-env/main/src/flags.ts.

Provider Detection

std-env can automatically detect the current runtime provider based on environment variables.

You can use isCI and platform exports to detect it:

import { isCI, provider, providerInfo } from "std-env";

console.log({
  isCI, // true
  provider, // "github_actions"
  providerInfo, // { name: "github_actions", isCI: true }
});

List of well known providers can be found from https://raw.githubusercontent.com/unjs/std-env/main/src/providers.ts.

Runtime Detection

std-env can automatically detect the current JavaScript runtime based on global variables, following the WinterCG Runtime Keys proposal:

import { runtime, runtimeInfo } from "std-env";

// "" | "node" | "deno" | "bun" | "workerd" ...
console.log(runtime);

// { name: "node" }
console.log(runtimeInfo);

You can also use individual named exports for each runtime detection:

When running code in Bun and Deno with Node.js compatibility mode, isNode flag will be also true, indicating running in a Node.js compatible runtime.Use runtime === "node" if you need strict check for Node.js runtime.
  • isNode
  • isBun
  • isDeno
  • isNetlify
  • isEdgeLight
  • isWorkerd
  • isFastly

List of well known providers can be found from https://raw.githubusercontent.com/unjs/std-env/main/src/runtimes.ts.

Platform-Agnostic env

std-env provides a lightweight proxy to access environment variables in a platform agnostic way.

import { env } from "std-env";

Platform-Agnostic process

std-env provides a lightweight proxy to access process object in a platform agnostic way.

import { process } from "std-env";

License

MIT