Adds Middleware API (#40)

* Adds test project

* Adds e2e for end-2-end tests

* Update gitignore

* Update loaders

* Creates test project

* v0.1.27

* Upgrade

* dependency fixes

* Load project plugins in the plugin loader

* Issue with instanceof

* Fixes versioning issues

* Adds medusa middleware api

* Adds documentation

* Fixes tests

packages/medusa-core-utils/src/create-require-from-path.js

@@ -0,0 +1,18 @@
+import Module from "module"
+import path from "path"
+
+const fallback = filename => {
+  const mod = new Module(filename)
+
+  mod.filename = filename
+  mod.paths = Module._nodeModulePaths(path.dirname(filename))
+  mod._compile(`module.exports = require;`, filename)
+
+  return mod.exports
+}
+
+// Polyfill Node's `Module.createRequireFromPath` if not present (added in Node v10.12.0)
+const createRequireFromPath =
+  Module.createRequire || Module.createRequireFromPath || fallback
+
+export default createRequireFromPath