Adjust code to work with es5 as a target.

src/SyncGate.tsx

@@ -33,7 +33,7 @@ class SyncGate extends React.PureComponent {
 
   componentWillReceiveProps(nextProps: PropsTypeInner) {
     if (nextProps.journals.value && (this.props.journals.value !== nextProps.journals.value)) {
-      for (const journal of nextProps.journals.value) {
+      nextProps.journals.value.forEach((journal) => {
         let prevUid: string | null = null;
         const entries = this.props.entries.get(journal.uid);
         if (entries && entries.value) {
@@ -42,7 +42,7 @@ class SyncGate extends React.PureComponent {
         }
 
         store.dispatch(fetchEntries(this.props.etesync, journal.uid, prevUid));
-      }
+      });
     }
   }
 

src/journal-processors.tsx

@@ -9,7 +9,7 @@ import * as EteSync from './api/EteSync';
 export function syncEntriesToItemMap(collection: EteSync.CollectionInfo, entries: List<EteSync.SyncEntry>) {
   let items: {[key: string]: ContactType} = {};
 
-  for (const syncEntry of entries) {
+  entries.forEach((syncEntry) => {
     let comp = new ContactType(new ICAL.Component(ICAL.parse(syncEntry.content)));
 
     const uid = comp.uid;
@@ -23,7 +23,7 @@ export function syncEntriesToItemMap(collection: EteSync.CollectionInfo, entries
     } else if (syncEntry.action === EteSync.SyncEntryAction.Delete) {
       delete items[uid];
     }
-  }
+  });
 
   return items;
 }
@@ -54,11 +54,11 @@ export function syncEntriesToCalendarItemMap(collection: EteSync.CollectionInfo,
 
   const color = colorIntToHtml(collection.color);
 
-  for (const syncEntry of entries) {
+  entries.forEach((syncEntry) => {
     let comp = EventType.fromVCalendar(new ICAL.Component(ICAL.parse(syncEntry.content)));
 
     if (comp === null) {
-      continue;
+      return;
     }
 
     comp.color = color;
@@ -74,7 +74,7 @@ export function syncEntriesToCalendarItemMap(collection: EteSync.CollectionInfo,
     } else if (syncEntry.action === EteSync.SyncEntryAction.Delete) {
       delete items[uid];
     }
-  }
+  });
 
   return items;
 }

tsconfig.json

@@ -2,7 +2,7 @@
   "compilerOptions": {
     "outDir": "build/dist",
     "module": "esnext",
-    "target": "es2015",
+    "target": "es5",
     "lib": ["es6", "dom"],
     "sourceMap": true,
     "allowJs": true,