@arundo/typed-env

Typed environment variables using Zod.

Installation

npm install @arundo/typed-env

# or

yarn add @arundo/typed-env

# or

pnpm add @arundo/typed-env

Usage

Create a environment file with a schema and use typeEnvironment to create a typed environment object:

// environment.ts
import { z } from 'zod';
import { typeEnvironment } from '@arundo/typed-env';

export const envSchema = z.object({
  NODE_ENV: z.enum(['test', 'development', 'production']),
  PORT: z.coerce.number().int().default(3000),
});

export const environment = typeEnvironment(envSchema);

Import the environment object and use it:

// server.ts
import { environment } from './environment';

console.log(environment.NODE_ENV); // 'development' - type string
console.log(environment.PORT); // 3000 - type number

Set naming convention of environment variables:

// environment.ts

/* ... as usual ... */

export const environment = typeEnvironment(envSchema, { transform: 'camelcase' });

// server.ts
import { environment } from './environment';

console.log(environment.nodeEnv); // 'development' - type string
console.log(environment.port); // 3000 - type number

If you for some reason need to access the raw environment object, you can add types like this:

// environment.ts
import { z } from 'zod';
import { typeEnvironment } from '@arundo/typed-env';

export const envSchema = z.object({
  PORT: z.coerce.number().int().default(3000),
});

export const environment = typeEnvironment(envSchema, { transform: 'camelcase' });

declare global {
  namespace NodeJS {
    interface ProcessEnv extends Record<keyof z.infer<typeof envSchema>, string | undefined> {}
  }
}

console.log(process.env.PORT); // '3000' - type string | undefined