Full gruntfile

Gruntfile.js

module.exports = function (grunt) {
	require('load-grunt-tasks')(grunt);
	grunt.initConfig({
		mkdir: {
			all: {
				options: {
					create: ['dist']
				}
			}
		},
		compress: {
			main: {
				options: {
					archive: 'my-cool-plugin.zip'
				},
				expand: true,
				src: [
					'assets/*',
					'includes/*',
					'my-cool-plugin.php'
				],
				dest: 'my-cool-plugin/'
			}
		},
		rename: {
			main: {
				files: [
					{src: ['my-cool-plugin.zip'], dest: 'dist/my-cool-plugin.zip'}
				]
			}
		},
		aws_s3: {
			options: {
				accessKeyId: '1234', // Use your own access key
				secretAccessKey: 'abcd', // Use your own secret access key
				region: 'US1', // Fill in your S3 region
				uploadConcurrency: 5, // 5 simultaneous uploads
				downloadConcurrency: 5, // 5 simultaneous downloads
				params: {
					CacheControl: '2592000'
				}
			},
			myBucket: {
				options: {
					bucket: 'my-bucket' // Change this to your S3 bucket name
				},
				files: [
					{
						dest: 'plugins/my-cool-plugin.zip',
						action: 'delete' // Let's delete the old version
					},
					{
						src: 'dist/my-cool-plugin.zip',  // The file to upload
						dest: 'plugins',    // destination folder on S3
						expand: true,
						flatten: true
					}
				]
			}
		}
	});

	grunt.registerTask('default', 'An empty task', function() {
		grunt.log.error('This is an empty task to keep bad things from happening.');
		return false;
	});

	grunt.registerTask('package', ['mkdir', 'compress', 'rename', 'aws_s3:myBucket']);
};