diff --git a/src/routes/api/sync.js b/src/routes/api/sync.js
index d522e9638..68ac0a6e8 100644
--- a/src/routes/api/sync.js
+++ b/src/routes/api/sync.js
@@ -8,7 +8,7 @@ const sqlInit = require('../../services/sql_init');
 const optionService = require('../../services/options');
 const contentHashService = require('../../services/content_hash.js');
 const log = require('../../services/log');
-const syncOptions = require('../../services/sync_options.js');
+const syncOptions = require('../../services/sync_options');
 const utils = require('../../services/utils');
 const ws = require('../../services/ws');
 
diff --git a/src/services/request.js b/src/services/request.js
index 88771439b..91543da58 100644
--- a/src/services/request.js
+++ b/src/services/request.js
@@ -3,7 +3,7 @@
 const utils = require('./utils');
 const log = require('./log');
 const url = require('url');
-const syncOptions = require('./sync_options.js');
+const syncOptions = require('./sync_options');
 
 // this service provides abstraction over node's HTTP/HTTPS and electron net.client APIs
 // this allows supporting system proxy
diff --git a/src/services/setup.js b/src/services/setup.js
index 9f6af260d..bb5bec96a 100644
--- a/src/services/setup.js
+++ b/src/services/setup.js
@@ -2,7 +2,7 @@ const syncService = require('./sync.js');
 const log = require('./log');
 const sqlInit = require('./sql_init');
 const optionService = require('./options');
-const syncOptions = require('./sync_options.js');
+const syncOptions = require('./sync_options');
 const request = require('./request.js');
 const appInfo = require('./app_info');
 const utils = require('./utils');
diff --git a/src/services/sync.js b/src/services/sync.js
index 7399919c4..1111cdb56 100644
--- a/src/services/sync.js
+++ b/src/services/sync.js
@@ -9,7 +9,7 @@ const dateUtils = require('./date_utils');
 const syncUpdateService = require('./sync_update.js');
 const contentHashService = require('./content_hash.js');
 const appInfo = require('./app_info');
-const syncOptions = require('./sync_options.js');
+const syncOptions = require('./sync_options');
 const syncMutexService = require('./sync_mutex');
 const cls = require('./cls');
 const request = require('./request.js');
diff --git a/src/services/sync_options.js b/src/services/sync_options.ts
similarity index 90%
rename from src/services/sync_options.js
rename to src/services/sync_options.ts
index a059be973..92aea6c3f 100644
--- a/src/services/sync_options.js
+++ b/src/services/sync_options.ts
@@ -1,7 +1,7 @@
 "use strict";
 
-const optionService = require('./options');
-const config = require('./config');
+import optionService = require('./options');
+import config = require('./config');
 
 /*
  * Primary configuration for sync is in the options (document), but we allow to override
@@ -10,11 +10,11 @@ const config = require('./config');
  * to live sync server.
  */
 
-function get(name) {
+function get(name: string) {
     return (config['Sync'] && config['Sync'][name]) || optionService.getOption(name);
 }
 
-module.exports = {
+export = {
     // env variable is the easiest way to guarantee we won't overwrite prod data during development
     // after copying prod document/data directory
     getSyncServerHost: () => process.env.TRILIUM_SYNC_SERVER_HOST || get('syncServerHost'),