export default class Environment {

    static ENVIRONMENTS = ['development', 'production'];

    static isDevelopment(): boolean {
        Environment.validate();
        return process.env.NODE_ENV === 'development';
    }

    static isProduction(): boolean {
        Environment.validate();
        return process.env.NODE_ENV === 'production';
    }

    private static validate(): boolean {
        if (process.env.NODE_ENV === undefined) {
            throw new Error('process.env.NODE_ENV==undefined');
        }
        if (!process.env.NODE_ENV in Environment.ENVIRONMENTS) {
            throw new Error(`incorrect NODE_ENV=${process.env.NODE_ENV}`);
        }
        return true;
    }
}