fix linter errors

packages/@uppy/companion/src/server/provider/dropbox/index.js

@@ -3,18 +3,17 @@ const purest = require('purest')({ request })
 const logger = require('../../logger')
 const adapter = require('./adapter')
 
-
 // From https://www.dropbox.com/developers/reference/json-encoding:
 //
 // This function is simple and has OK performance compared to more
 // complicated ones: http://jsperf.com/json-escape-unicode/4
-const charsToEncode = /[\u007f-\uffff]/g;
-function http_header_safe_json(v) {
+const charsToEncode = /[\u007f-\uffff]/g
+function httpHeaderSafeJson (v) {
   return JSON.stringify(v).replace(charsToEncode,
-    function(c) {
-      return '\\u'+('000'+c.charCodeAt(0).toString(16)).slice(-4);
+    function (c) {
+      return '\\u' + ('000' + c.charCodeAt(0).toString(16)).slice(-4)
     }
-  );
+  )
 }
 
 class DropBox {
@@ -97,7 +96,7 @@ class DropBox {
       .options({
         version: '2',
         headers: {
-          'Dropbox-API-Arg': http_header_safe_json({path: `${id}`})
+          'Dropbox-API-Arg': httpHeaderSafeJson({path: `${id}`})
         }
       })
       .auth(token)
@@ -115,7 +114,7 @@ class DropBox {
       .options({
         version: '2',
         headers: {
-          'Dropbox-API-Arg': http_header_safe_json({path: `${id}`})
+          'Dropbox-API-Arg': httpHeaderSafeJson({path: `${id}`})
         }
       })
       .auth(token)