Adds publish/subscribe pattern to allow plugins and projects to hook into events (#55)

Also adds CLI to ease development.

e2e/prod-project/.gitignore

@@ -1,3 +1,4 @@
 /node_modules
+/dist
 .env
 

e2e/prod-project/package.json

@@ -10,8 +10,7 @@
   "author": "Sebastian Rindom",
   "license": "GPL-3.0",
   "devDependencies": {
-    "@babel/cli": "^7.7.5",
-    "@babel/core": "^7.7.5",
+    "@babel/core": "^7.9.6",
     "@babel/node": "^7.7.4",
     "@babel/plugin-proposal-class-properties": "^7.7.4",
     "@babel/plugin-transform-instanceof": "^7.8.3",
@@ -27,8 +26,12 @@
     "supertest": "^4.0.2"
   },
   "dependencies": {
+    "@medusajs/medusa": "^0.1.27",
+    "bl": "^4.0.2",
     "express": "^4.17.1",
-    "medusa-payment-stripe": "^0.1.27"
+    "medusa-interfaces": "^0.1.27",
+    "medusa-payment-stripe": "^0.1.27",
+    "mongoose": "^5.9.12"
   },
   "scripts": {
     "start": "nodemon --watch plugins/ --watch src/ --exec babel-node node_modules/@medusajs/medusa/dist/app.js"

e2e/prod-project/src/subscribers/cart.js

@@ -0,0 +1,14 @@
+class CartSubscriber {
+  constructor({ cartService, eventBusService }) {
+    this.eventBus_ = eventBusService
+
+    this.eventBus_.subscribe("cart.created", this.log)
+    this.eventBus_.subscribe("cart.updated", this.log)
+  }
+
+  async log(c) {
+    console.log(c)
+  }
+}
+
+export default CartSubscriber