Weather App Tutorial - Reading Configuration

WeatherService.ts

const key: string = process.env.REACT_APP_OPEN_WEATHER_API_KEY as string;
if (key === undefined) {
  throw new Error('No Open Weather API Key defined - ensure you set a variable called REACT_APP_OPEN_WEATHER_API_KEY')
}

const keyQuery = `appid=${key}`
const server = 'http://api.openweathermap.org/data/2.5';