Cloudflare-DDNS-Updater/src/providers/Environment.ts

import * as path from "path";
import * as dotenv from "dotenv";

import Logger from "../libs/Logger";

const requiredENV = [
    'NODE_ENV',
];

class Environment {

    public init(): void {
        dotenv.config({ path: path.resolve(__dirname, "../../.env") });

        for (let param of requiredENV) {
            if (this.isUndefinedOrEmpty(process.env[param]))
                throw new Error(`.env ${param} is undefined`);
        }

        // NODE_ENV Checks
        if (this.get().NODE_ENV != "production" && this.get().NODE_ENV != "development")
            throw new Error('.env NODE_ENV must be either "production" or "development"');

        Logger.log('info', `Running in ${process.env.NODE_ENV} environment`);
    }

    public get(): any {

        const NODE_ENV = process.env.NODE_ENV;
      
        return {
            NODE_ENV
        };
    }

    private isUndefinedOrEmpty(value: String | undefined): boolean {
        if(typeof value === 'undefined')
            return true;

        if(value === undefined)
            return true;

        if(value === '')
            return true;

        return false;
    }

}

export default new Environment();