Client.js

const EnvironmentConfigProvider = require('../EnvironmentConfigProvider');

(function (root, factory) {
    factory(require('../index'));
}(this, function (SalesforceMarketingCloud) {
    class Client {
        constructor(clientConfig) {
            let _authBaseUrl;
            this.getAuthBaseUrl = () => { return _authBaseUrl; };
            let _clientId;
            this.getClientId = () => { return _clientId; };
            let _clientSecret;
            this.getClientSecret = () => { return _clientSecret; };
            let _accountId;
            this.getAccountId = () => { return _accountId; };
            let _scope;
            this.getScope = () => { return _scope; };

            this._assetApi = undefined;
	    this._campaignApi = undefined;
	    this._transactionalMessagingApi = undefined;

            if (!clientConfig) {
                let environmentConfigProvider = new EnvironmentConfigProvider();

                _authBaseUrl = environmentConfigProvider.get('SFMC_AUTH_BASE_URL');
                _clientId = environmentConfigProvider.get('SFMC_CLIENT_ID');
                _clientSecret = environmentConfigProvider.get('SFMC_CLIENT_SECRET');
                _accountId = environmentConfigProvider.get('SFMC_ACCOUNT_ID');
                _scope = environmentConfigProvider.get('SFMC_SCOPE', false);
            } else {
                _authBaseUrl = clientConfig.authBaseUrl;
                _clientId = clientConfig.clientId;
                _clientSecret = clientConfig.clientSecret;
                _accountId = clientConfig.accountId;
                _scope = clientConfig.scope;
            }
        }
    
	    get assetApi() {
                if(this._assetApi === undefined){
                    this._assetApi = new SalesforceMarketingCloud.AssetApi(
                    this.getAuthBaseUrl(),
                    this.getClientId(),
                    this.getClientSecret(),
                    this.getAccountId(),
                    this.getScope());
                }
                return this._assetApi;
            }
	    get campaignApi() {
                if(this._campaignApi === undefined){
                    this._campaignApi = new SalesforceMarketingCloud.CampaignApi(
                    this.getAuthBaseUrl(),
                    this.getClientId(),
                    this.getClientSecret(),
                    this.getAccountId(),
                    this.getScope());
                }
                return this._campaignApi;
            }
	    get transactionalMessagingApi() {
                if(this._transactionalMessagingApi === undefined){
                    this._transactionalMessagingApi = new SalesforceMarketingCloud.TransactionalMessagingApi(
                    this.getAuthBaseUrl(),
                    this.getClientId(),
                    this.getClientSecret(),
                    this.getAccountId(),
                    this.getScope());
                }
                return this._transactionalMessagingApi;
            }
    }
    module.exports = Client;
}));