Working error handling; refactored a bit but same functionality

src/lib/Controller.js

@@ -59,13 +59,13 @@ class Controller {
           indexedData[item] = results[idx]
         })
         try {
-          await exportToFile(fileDest, indexedData)
-          return copy.success.export(fileDest)
+          const message = await exportToFile(fileDest, indexedData)
+          return message
         } catch (e) {
           return Promise.reject(e)
         }
       } else {
-        return Promise.reject(new Error(copy.errors.export.writeFailed))
+        throw new Error(copy.errors.export.writeFailed)
       }
     })
   }

src/lib/util.js

@@ -1,5 +1,5 @@
 import R from 'ramda'
-import fs from 'file-system'
+import { promises as fs } from 'file-system'
 import copy from '../copy/en'
 
 /* eslint-disable */
@@ -16,13 +16,16 @@ function camelize (str) {
   })
 }
 
-export function exportToFile(fileDest, data) {
+export async function exportToFile(fileDest, data) {
   const stringifiedData = JSON.stringify(data, null, 2)
   const filePath = `${fileDest}/export.json`
 
-  fs.writeFile(filePath, stringifiedData, (err) => {
-    if (err) throw new Error(copy.errors.export.writeFailed)
-  })
+  try {
+    await fs.writeFile(filePath, stringifiedData)
+    return copy.success.export(filePath)
+  } catch (err) {
+    throw new Error(copy.errors.export.writeFailed)
+  }
 }
 
 export const fmtObj = R.curry(