This TypeScript code enhances environment variable type safety through Zod validation. It creates a schema that explicitly defines expected environment variables. The code then validates the current environment against this schema and extends TypeScr

type-safe-env

/* eslint-disable @typescript-eslint/no-namespace */
/**
 * Configuration for type-safe environment variables.
 * Imported through src/app/page.tsx
 * @see https://x.com/mattpocockuk/status/1760991147793449396
 */

import { z } from 'zod'

const envVariables = z.object({
  NEXT_PUBLIC_SHOW_LOGGER: z.enum(['true', 'false']).optional(),
  DATABASE_URL: z.string().optional(),
})

envVariables.parse(process.env)

declare global {
  namespace NodeJS {
    // eslint-disable-next-line @typescript-eslint/no-empty-interface
    interface ProcessEnv extends z.infer<typeof envVariables> {}
  }
}
export const isProd = process.env.NODE_ENV === 'production'
export const isLocal = process.env.NODE_ENV === 'development'
export const showLogger =
  isLocal || process.env.NEXT_PUBLIC_SHOW_LOGGER === 'true'