gulpfile.js

var gulp = require('gulp');
var awspublish = require('gulp-awspublish');
var cloudfront = require('gulp-cloudfront-invalidate-aws-publish');
var parallelize = require('concurrent-transform');

// https://docs.aws.amazon.com/cli/latest/userguide/cli-environment.html

var config = {

    // Required
    params: {
        Bucket: process.env.AWS_BUCKET_NAME
    },
    credentials: {
        accessKeyId: process.env.AWS_ACCESS_KEY_ID,
        secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
        signatureVersion: 'v3'
    },

    // Optional
    deleteOldVersions: false,                 // NOT FOR PRODUCTION
    distribution: process.env.AWS_CLOUDFRONT, // CloudFront distribution ID
    region: process.env.AWS_DEFAULT_REGION,
    headers: { /*'Cache-Control': 'max-age=315360000, no-transform, public',*/ },

    // Sensible Defaults - gitignore these Files and Dirs
    distDir: 'dist',
    indexRootPath: true,
    cacheFileName: '.awspublish',
    concurrentUploads: 10,
    wait: true,  // wait for CloudFront invalidation to complete (about 30-60 seconds)
}

gulp.task('deploy', function () {
    // create a new publisher using S3 options
    // http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/S3.html#constructor-property
    var publisher = awspublish.create(config);

    var g = gulp.src('./' + config.distDir + '/**');
    // publisher will add Content-Length, Content-Type and headers specified above
    // If not specified it will set x-amz-acl to public-read by default
    g = g.pipe(parallelize(publisher.publish(config.headers), config.concurrentUploads))

    // Invalidate CDN
    if (config.distribution) {
        console.log('Configured with CloudFront distribution');
        g = g.pipe(cloudfront(config));
    } else {
        console.log('No CloudFront distribution configured - skipping CDN invalidation');
    }

    // Delete removed files
    if (config.deleteOldVersions) g = g.pipe(publisher.sync());
    // create a cache file to speed up consecutive uploads
    g = g.pipe(publisher.cache());
    // print upload updates to console
    g = g.pipe(awspublish.reporter());
    return g;
});