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

packages/medusa-core-utils/src/get-config-file.js

@@ -0,0 +1,23 @@
+import path from "path"
+
+/**
+ * Attempts to resolve the config file in a given root directory.
+ * @param {string} rootDir - the directory to find the config file in.
+ * @param {string} configName - the name of the config file.
+ * @return {object} an object containing the config module and its path.
+ */
+function getConfigFile(rootDir, configName) {
+  const configPath = path.join(rootDir, configName)
+  let configFilePath = ``
+  let configModule
+  try {
+    configFilePath = require.resolve(configPath)
+    configModule = require(configFilePath)
+  } catch (err) {
+    return {}
+  }
+
+  return { configModule, configFilePath }
+}
+
+export default getConfigFile

packages/medusa-core-utils/src/index.js

@@ -1,2 +1,4 @@
 export { default as Validator } from "./validator"
 export { default as MedusaError } from "./errors"
+export { default as getConfigFile } from "./get-config-file"
+export { default as createRequireFromPath } from "./create-require-from-path"