build.js

const copy = require('recursive-copy');
const path = require('path');
const fs = require('fs');

class Build {

    constructor () {
        this.paths = [
            ["node_modules", path.join("dist", "node_modules")],
            ["steps", path.join("dist", "steps")],
            ["features", path.join("dist", "features")],
            ["cucumber.conf.js",  path.join("dist", "cucumber.conf.js")],
            ["nightwatch.conf.js", path.join("dist","nightwatch.conf.js")],
            ["features_disabled",  path.join("dist", "features_disabled")],
            ["run_chrome.bat", path.join("dist", "run_chrome.bat")],
            ["run_firefox.bat", path.join("dist", "run_firefox.bat")]
        ];

        this.runtimeConfigContent = 
`module.exports = {
    email: "user00094900@gmail.com",
    password: "pa$$w0rd"
}`;
    }

    _copy(resourcePath, resourceDestination) {
        let result = true;

        copy(resourcePath, resourceDestination)
            .on(copy.events.ERROR, (error, copyOperation) => {
                console.error('Unable to copy ' + copyOperation.dest);
            })
            .then((results) => {
                console.info(results.length + ' file(s) copied');
            })
            .catch((error) => {
                console.error('Copy failed: ' + error);
                result = false;
            });

        return result;
    }

    run() {
        this.paths.every(resource => {
            const isSuccessful = this._copy(resource[0], resource[1]);

            if (!isSuccessful) {
                console.error("Error copying files.");
            }

            return isSuccessful;
        });

        fs.writeFile(path.join("dist", "runtime.config"), this.runtimeConfigContent, err => {
            if (err) {
                console.error("couldn't generate runtime.config file.");
            } else {
                console.info("runtime.config generated.");
            }
        });
    }

}

new Build().run();