Add development configuration loader

src/utils/loadConfiguration.js

@@ -4,10 +4,31 @@ import glob from 'glob'
 import defaultConfig from '../constants/defaultConfig'
 
 export const loadConfiguration = (appPath) => {
-  const filePaths = glob.sync(appPath + '/config/*.yml', {})
-  const jsonConfig = filePaths.map((filepath) =>
-    yaml.load(fs.readFileSync(filepath, 'utf8'))
-  )
+  const isProd = process.env.NODE_ENV === 'production'
+  const filePaths = glob.sync(appPath + '/config/*.yml')
+  const configurationPaths = splitFilePathsByEnv(filePaths)
+
+  const jsonConfig = [
+    ...configurationPaths.prod,
+    ...(!isProd ? configurationPaths.dev : [])
+  ].map((filepath) => yaml.load(fs.readFileSync(filepath, 'utf8')))
 
   return Object.assign({}, defaultConfig, ...jsonConfig)
 }
+
+function splitFilePathsByEnv(filepaths) {
+  const devExtension = '.development.yml'
+
+  return filepaths.reduce(
+    (acc, current) => {
+      if (current.includes(devExtension)) {
+        acc.dev.push(current)
+      } else {
+        acc.prod.push(current)
+      }
+
+      return acc
+    },
+    { dev: [], prod: [] }
+  )
+}