Made communication identical in both directions. Removed modeling. Removed classes.

.babelrc

@@ -1,4 +1,12 @@
 {
-  "presets": [ "es2015-rollup" ],
-  "plugins": ["transform-class-properties"]
+  "presets": [ "es2015" ],
+  "plugins": [
+    "transform-es2015-modules-umd",
+    [
+      "rename-umd-globals",
+      {
+        "postmate": "Postmate"
+      }
+    ]
+  ]
 }

Gulpfile.js

@@ -1,18 +1,16 @@
 
-const babel = require('rollup-plugin-babel');
+const babel = require('gulp-babel');
+const uglify = require('gulp-uglify');
+const rename = require('gulp-rename');
 const connect = require('connect');
 const eslint = require('gulp-eslint');
 const fs = require('fs');
 const gulp = require('gulp');
 const header = require('gulp-header');
 const http = require('http');
-const minify = require('uglify-js').minify;
 const mochaPhantomJS = require('gulp-mocha-phantomjs');
 const path = require('path');
-const rollup = require('rollup-stream');
 const serveStatic = require('serve-static');
-const source = require('vinyl-source-stream');
-const uglify = require('rollup-plugin-uglify');
 
 var parentServer; // eslint-disable-line no-var
 var childServer; // eslint-disable-line no-var
@@ -27,23 +25,15 @@ const banner = ['/**',
   ''].join('\n');
 
 gulp.task('do-build', () =>
-  rollup({
-    entry: './src/postmate.js',
-    format: 'umd',
-    moduleName: 'Postmate',
-    plugins: [
-      babel({
-        exclude: 'node_modules/**',
-      }),
-      uglify({}, minify),
-    ],
-  })
-    .pipe(source('postmate.min.js'))
+  gulp.src('./src/postmate.js')
+    .pipe(babel())
+    .pipe(uglify())
     .pipe(header(banner, { pkg }))
+    .pipe(rename('postmate.min.js'))
     .pipe(gulp.dest('./build'))
 );
 
-gulp.task('update-readme', () => {
+gulp.task('update-readme', ['do-build'], () => {
   const readme = path.join(__dirname, 'README.md');
   const data = fs.readFileSync(readme, 'utf-8');
   const distSize = fs.statSync(path.join(__dirname, 'build', 'postmate.min.js')).size;

README.md

@@ -35,7 +35,7 @@ You can download the compiled javascript directly [here](/build/postmate.min.js)
 * Child emits events that the parent can listen to.
 * Parent can `call` functions within a `child`
 * *Zero* dependencies. Provide your own polyfill or abstraction for the `Promise` API if needed.
-* Lightweight, weighing in at ~ <span class="size">`5.2kb`</span>.
+* Lightweight, weighing in at ~ <span class="size">`4.1kb`</span>.
 
 ## Installing
 Postmate can be installed via NPM or Bower.

package.json

@@ -7,29 +7,28 @@
     "build"
   ],
   "devDependencies": {
-    "babel-plugin-transform-class-properties": "^6.11.5",
-    "babel-preset-es2015-rollup": "^1.1.1",
+    "babel-plugin-rename-umd-globals": "0.0.4",
+    "babel-plugin-transform-es2015-modules-umd": "^6.12.0",
+    "babel-preset-es2015": "^6.16.0",
     "chai": "^3.5.0",
     "connect": "^3.4.1",
     "eslint-config-airbnb": "^9.0.1",
     "eslint-plugin-import": "^1.12.0",
     "gulp": "^3.9.1",
+    "gulp-babel": "^6.1.2",
     "gulp-eslint": "^3.0.1",
     "gulp-header": "^1.8.7",
     "gulp-mocha-phantomjs": "^0.11.0",
+    "gulp-rename": "^1.2.2",
+    "gulp-uglify": "^2.0.0",
     "mocha": "^3.0.2",
     "mocha-phantomjs": "^4.1.0",
-    "rollup-plugin-babel": "^2.6.1",
-    "rollup-plugin-uglify": "^1.0.1",
-    "rollup-stream": "^1.11.0",
     "rsvp": "^3.2.1",
-    "serve-static": "^1.11.1",
-    "uglify-js": "^2.7.0",
-    "vinyl-source-stream": "^1.1.0"
+    "serve-static": "^1.11.1"
   },
   "scripts": {
     "test": "gulp test",
-    "build": "gulp build && gulp update-readme",
+    "build": "gulp build update-readme",
     "build-watch": "gulp build-watch",
     "lint": "gulp lint",
     "postpublish": "git tag $npm_package_version && git push origin --tags"
@@ -52,5 +51,6 @@
   "bugs": {
     "url": "https://github.com/dollarshaveclub/postmate/issues"
   },
-  "homepage": "https://github.com/dollarshaveclub/postmate"
+  "homepage": "https://github.com/dollarshaveclub/postmate",
+  "dependencies": {}
 }