std-env

What is std-env?

The std-env npm package is designed to help developers easily determine the environment their code is running in. It provides a straightforward way to check if the current environment is development, production, test, or a CI (Continuous Integration) environment. This can be particularly useful for configuring applications differently based on the environment or for including/excluding certain features or outputs based on where the code is running.

What are std-env's main functionalities?

Check if the environment is development

This feature allows you to check if your code is running in a development environment. It's useful for enabling debug logs or development-specific features.

const isDev = require('std-env').isDev;
console.log(isDev); // true if in a development environment

Check if the environment is production

This feature enables you to determine if your application is running in a production environment, which is useful for enabling optimizations or features that should only be available in production.

const isProd = require('std-env').isProd;
console.log(isProd); // true if in a production environment

Check if the environment is test

With this feature, you can easily identify if your code is being executed in a test environment, allowing you to adjust configurations or disable certain functionalities during testing.

const isTest = require('std-env').isTest;
console.log(isTest); // true if in a test environment

Check if running in a CI environment

This feature helps in detecting if your application is running in a CI environment, which can be crucial for configuring CI-specific settings or behaviors.

const isCI = require('std-env').isCI;
console.log(isCI); // true if running in a Continuous Integration environment

Other packages similar to std-env

cross-env

cross-env allows you to set and use environment variables across platforms. It's similar to std-env in the sense that it helps manage environment-specific settings, but it focuses more on setting environment variables rather than detecting the environment.

dotenv

dotenv is a package that loads environment variables from a .env file into process.env. While it serves a different purpose by managing environment variables, it complements std-env's functionality by allowing developers to configure their applications based on the detected environment.

README

std-env

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 ./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 ./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:

[!NOTE] 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 ./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