env-types.d.ts

declare namespace NodeJS {
  export interface ProcessEnv {
    REACT_APP_API_KEY: string;
    REACT_APP_AUTH_DOMAIN: string;
    REACT_APP_PROJECT_ID: string;
    REACT_APP_STORAGE_BUCKET: string;
    REACT_APP_MESSAGING_SENDER_ID: string;
    REACT_APP_APP_ID: string;
    REACT_APP_MEASUREMENT_ID: string;
  }
}