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Type Node environment variables

Environment variables in Node are available on the process.env object. To add the Typescript types, make sure the Node.js types @types/node are installed and create an environment.d.ts file in which the variables can be declared like this:

declare global {
  namespace NodeJS {
    interface ProcessEnv {
      PORT: string
      LOG_LEVEL: 'error' | 'warning' | 'info'

export {}