typed-env

A typed environment variable parser with support for choices, custom parsers, and more.

Usage

import { createEnv } from 'typed-env';

const env = createEnv({
  PORT: { type: 'number', default: 80 }
});

env.PORT; // number

Features

• Strongly typed
• Supports custom parsers
• Supports optional environment variables
• Supports limiting the possible values (see Choices)
• Supports passing custom environments (see Options)

Choices

import { createEnv } from 'typed-env';

const env = createEnv({
  NODE_ENV: {
    type: 'string',
    choices: ['development', 'production']
  }
});

env.NODE_ENV; // 'development' | 'production'

Parser

You can pass a parser function to return your own custom type

import { createEnv } from 'typed-env';

const env = createEnv({
  HOMEPAGE: { parser: url => new URL(url) }
});

env.HOMEPAGE; // URL

Options

If you want to use a custom env, pass env in the options parameter, otherwise it will load from process.env

interface Options {
  env?: Record<string, string> | NodeJS.ProcessEnv;
}