Convenience/helper function for taking screenshots using Protractor/WebDriver and NodeJS

pageSpec.js

// Example usage to check visibility (using Jasmine and Protractor)
describe('My page', function() {
  it('displays "Hello World" after clicking something on the page', function() {
    saveScreenshot('C:\\Users\\omouse\\Documents\\test-step-1.png');
    clickSomethingOnPage();
    saveScreenshot('C:\\Users\\omouse\\Documents\\test-step-2.png');

    var helloWorld = element(by.css('.message'));
    var helloWorldIsVisible = protractor.ExpectedConditions.visibilityOf(helloWorld);
    expect(helloWorldIsVisible()).toBe(true);
  });
});

screenshot.js

// for use with Protractor/Webdriver
var fs = require('fs');
var path = require('path');

var saveScreenshot = function(pathname) {
  browser.takeScreenshot().then(function(png) {
    var file = path.resolve(pathname);
    fs.writeFileSync(file, png, { encoding: 'base64' }, console.log);
  });
};

making an NPM module that utilizes this